Home » Public Forums » GMCnet » Shark Vents
| Shark Vents [message #368179] |
Fri, 24 December 2021 16:13  |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Senior Member |
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Merry Christmas All,
I will be at a point of cutting for the shark type engine vents. My question is as follows: with all the years of installing these vent, have they proven to be effective at cooling the engine?
Thanks all and have a Merry Christmas,
Tom and Oki K.
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| [GMCnet] Re: Shark Vents [message #368180 is a reply to message #368179] |
Fri, 24 December 2021 17:02  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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My recollection of engine cooling discussions here is that the plastic
fender liners that many remove to simplify other repairs are designed to
not only stop water and debris from getting into the engine bay but to draw
air out of the engine compartment. I think it was Gene Fisher who
researched this. That said if you are going to cut the body and install the
“gills “ do it where it looks best because I’m not convinced that they will
make a big impact of cooling.
Sully
Bellevue wa
On Fri, Dec 24, 2021 at 2:13 PM wrote:
> Merry Christmas All,
>
> I will be at a point of cutting for the shark type engine vents. My
> question is as follows: with all the years of installing these vent, have
> they
> proven to be effective at cooling the engine?
>
> Thanks all and have a Merry Christmas,
> Tom and Oki K.
>
> --
> Tom & Oki Katzenberger,
> Kingsville, Maryland,
> 1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control,
> Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee
> Ignition
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| [GMCnet] Re: Shark Vents [message #368181 is a reply to message #368179] |
Fri, 24 December 2021 17:05 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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I also deal in Air flow in Bio Hazard and HVAC and have
sensitive instruments that measure air flow and volume of air.
We know traveling down the road that there is stagnant air toward the back
of the engine compartment as well as when the engine is at idle.
Also the temperature of air coming out of the side vents also indicates
what it is doing.
I believe that larger is better and even with restrictions , those end
sections operate 20-30%.
We provide lot of them to the owners and receive positive feedback.
On Fri, Dec 24, 2021 at 2:13 PM wrote:
> Merry Christmas All,
>
> I will be at a point of cutting for the shark type engine vents. My
> question is as follows: with all the years of installing these vent, have
> they
> proven to be effective at cooling the engine?
>
> Thanks all and have a Merry Christmas,
> Tom and Oki K.
>
> --
> Tom & Oki Katzenberger,
> Kingsville, Maryland,
> 1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control,
> Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee
> Ignition
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| [GMCnet] Re: Shark Vents [message #368182 is a reply to message #368179] |
Fri, 24 December 2021 17:28 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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I reread you question.
The better the radiator works the cooler the engine can run.
More free air flow will have gain.
On Fri, Dec 24, 2021 at 3:05 PM Jim Kanomata wrote:
> I also deal in Air flow in Bio Hazard and HVAC and have
> sensitive instruments that measure air flow and volume of air.
> We know traveling down the road that there is stagnant air toward the back
> of the engine compartment as well as when the engine is at idle.
> Also the temperature of air coming out of the side vents also indicates
> what it is doing.
> I believe that larger is better and even with restrictions , those end
> sections operate 20-30%.
> We provide lot of them to the owners and receive positive feedback.
>
> On Fri, Dec 24, 2021 at 2:13 PM wrote:
>
>> Merry Christmas All,
>>
>> I will be at a point of cutting for the shark type engine vents. My
>> question is as follows: with all the years of installing these vent, have
>> they
>> proven to be effective at cooling the engine?
>>
>> Thanks all and have a Merry Christmas,
>> Tom and Oki K.
>>
>> --
>> Tom & Oki Katzenberger,
>> Kingsville, Maryland,
>> 1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark
>> Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan
>> W/Bovee
>> Ignition
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
> Jim Kanomata ASE
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.gmcrvparts.com
> 1-800-752-7502
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| [GMCnet] Re: Shark Vents [message #368183 is a reply to message #368181] |
Fri, 24 December 2021 17:34 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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One of the first things I did to my coach after I got it was to install the
vents. I think that they add a great deal to removing engine heat. I left
the inner fenders intact. If you choose to run without inner fenders, I
don't think you need the "shark gill" vents. But they look cool anyway.
Jim Hupy
Salem, Oregon
On Fri, Dec 24, 2021, 3:05 PM Jim Kanomata wrote:
> I also deal in Air flow in Bio Hazard and HVAC and have
> sensitive instruments that measure air flow and volume of air.
> We know traveling down the road that there is stagnant air toward the back
> of the engine compartment as well as when the engine is at idle.
> Also the temperature of air coming out of the side vents also indicates
> what it is doing.
> I believe that larger is better and even with restrictions , those end
> sections operate 20-30%.
> We provide lot of them to the owners and receive positive feedback.
>
> On Fri, Dec 24, 2021 at 2:13 PM wrote:
>
>> Merry Christmas All,
>>
>> I will be at a point of cutting for the shark type engine vents. My
>> question is as follows: with all the years of installing these vent, have
>> they
>> proven to be effective at cooling the engine?
>>
>> Thanks all and have a Merry Christmas,
>> Tom and Oki K.
>>
>> --
>> Tom & Oki Katzenberger,
>> Kingsville, Maryland,
>> 1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark
> Control,
>> Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee
>> Ignition
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
> Jim Kanomata ASE
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.gmcrvparts.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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| [GMCnet] Re: Shark Vents [message #368184 is a reply to message #368183] |
Fri, 24 December 2021 18:12 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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On boats, engine room vents are REQUIRED on all vessels
with engines installed inside the hull. They are positioned
on opposite sides of the hull. One vent is oriented so that
air is directed into the engine room when the boat is moving
forward and out of the engine room on the other side.
Also on boats, powered venting is required to forcefully
exhaust air OUT of the engine compartment. Safety
demands operation of the vent fans for at least 5 minutes
before engine start! This is to eliminate any fuel fumes that
may be in the compartment. It is unlikely that our coaches
have room enough for that, though, and we need to have
motion down the road.
I believe if I were to add those vents, I would install the
input side on the left hand sided of the coach, simply to
keep the fuel intake area (and driver window) out of the
hot air exhaust.
D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
________________________________
From: James Hupy
Sent: Friday, December 24, 2021 17:34
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Shark Vents
One of the first things I did to my coach after I got it was to install the
vents. I think that they add a great deal to removing engine heat. I left
the inner fenders intact. If you choose to run without inner fenders, I
don't think you need the "shark gill" vents. But they look cool anyway.
Jim Hupy
Salem, Oregon
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| [GMCnet] Re: Shark Vents [message #368186 is a reply to message #368179] |
Fri, 24 December 2021 18:58 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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On boats, those bilge vents are a very important safety component.
Particularly with gasoline fueled vessels. Not quite as big a hazard with
diesel fuel, but still a good idea. I also have a good deal of experience
with boats, not as many pleasure craft, but much with work boats. Both
fresh water and salt water. Mostly fishing boats in 30' to 100' lengths.
Those bilges are knarly, greasy places for the most part. Coast Guard will
inspect those vessels and cite the heck out of owners for inoperative bilge
vents.
Jim Hupy
Salem, Oregon
On Fri, Dec 24, 2021, 4:39 PM Jim Kanomata wrote:
> Mac,
> Our coaches have air forced by the cooling fan, so by having one in and one
> out would not function well as air will vent out.
>
> On Fri, Dec 24, 2021 at 4:12 PM D C _Mac_ Macdonald
> wrote:
>
>> On boats, engine room vents are REQUIRED on all vessels
>> with engines installed inside the hull. They are positioned
>> on opposite sides of the hull. One vent is oriented so that
>> air is directed into the engine room when the boat is moving
>> forward and out of the engine room on the other side.
>>
>> Also on boats, powered venting is required to forcefully
>> exhaust air OUT of the engine compartment. Safety
>> demands operation of the vent fans for at least 5 minutes
>> before engine start! This is to eliminate any fuel fumes that
>> may be in the compartment. It is unlikely that our coaches
>> have room enough for that, though, and we need to have
>> motion down the road.
>>
>> I believe if I were to add those vents, I would install the
>> input side on the left hand sided of the coach, simply to
>> keep the fuel intake area (and driver window) out of the
>> hot air exhaust.
>>
>> D C "Mac" Macdonald
>> Amateur Radio K2GKK
>> Since 30 November '53
>> USAF and FAA, Retired
>> Member GMCMI & Classics
>> Oklahoma City, OK
>> "The Money Pit"
>> TZE166V101966
>> '76 ex-Palm Beach
>> k2gkk + hotmail dot com
>>
>>
>>
>> ________________________________
>> From: James Hupy
>> Sent: Friday, December 24, 2021 17:34
>> To: gmclist@list.gmcnet.org
>> Subject: [GMCnet] Re: Shark Vents
>>
>> One of the first things I did to my coach after I got it was to install
> the
>> vents. I think that they add a great deal to removing engine heat. I left
>> the inner fenders intact. If you choose to run without inner fenders, I
>> don't think you need the "shark gill" vents. But they look cool anyway.
>> Jim Hupy
>> Salem, Oregon
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
> Jim Kanomata ASE
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.gmcrvparts.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
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| [GMCnet] Re: Shark Vents [message #368187 is a reply to message #368184] |
Fri, 24 December 2021 18:38 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Mac,
Our coaches have air forced by the cooling fan, so by having one in and one
out would not function well as air will vent out.
On Fri, Dec 24, 2021 at 4:12 PM D C _Mac_ Macdonald
wrote:
> On boats, engine room vents are REQUIRED on all vessels
> with engines installed inside the hull. They are positioned
> on opposite sides of the hull. One vent is oriented so that
> air is directed into the engine room when the boat is moving
> forward and out of the engine room on the other side.
>
> Also on boats, powered venting is required to forcefully
> exhaust air OUT of the engine compartment. Safety
> demands operation of the vent fans for at least 5 minutes
> before engine start! This is to eliminate any fuel fumes that
> may be in the compartment. It is unlikely that our coaches
> have room enough for that, though, and we need to have
> motion down the road.
>
> I believe if I were to add those vents, I would install the
> input side on the left hand sided of the coach, simply to
> keep the fuel intake area (and driver window) out of the
> hot air exhaust.
>
> D C "Mac" Macdonald
> Amateur Radio K2GKK
> Since 30 November '53
> USAF and FAA, Retired
> Member GMCMI & Classics
> Oklahoma City, OK
> "The Money Pit"
> TZE166V101966
> '76 ex-Palm Beach
> k2gkk + hotmail dot com
>
>
>
> ________________________________
> From: James Hupy
> Sent: Friday, December 24, 2021 17:34
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Re: Shark Vents
>
> One of the first things I did to my coach after I got it was to install the
> vents. I think that they add a great deal to removing engine heat. I left
> the inner fenders intact. If you choose to run without inner fenders, I
> don't think you need the "shark gill" vents. But they look cool anyway.
> Jim Hupy
> Salem, Oregon
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Shark Vents [message #368193 is a reply to message #368179] |
Sat, 25 December 2021 09:55 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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They may help with venting heat soak at shut down. That’s all. The rest is owner feel good because they feel hot air coming out. The engine room, unlike a boat has no floor and is wide open. The air that enters the radiator is the same temp with or without the vents. Yes the engine room area tends to trap air underneath and become higher pressure, but if you look at the cross sectional area of the vents compared to the radiator and CFM the fan CAN move, it’s not a helpful factor. Not only that on most vent jobs, cut that area by 50% as only half if the vent functions due to step intrusion. The biggest help in cooling for me was the Hi flow Flowkooler 195 stat, and the under core support air deflector, both from Applied. 🎄🎄🎄🎄
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Sat, 25 December 2021 10:10] Report message to a moderator |
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| [GMCnet] Re: Shark Vents [message #368194 is a reply to message #368193] |
Sat, 25 December 2021 10:28 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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The very last coaches with the 403 engines had the best air deflectors in
front of the radiator. There are many pieces involved, some are sheet
metal, and some are a flexible material similar to truck mud flaps. None of
the air that enters the grill area is left undirected. It all goes through
the evaporator of the A.C. and then through the radiator core.
Todd Sullivan's coach was a 77 with a 455. It contains none of the
air deflectors that my 78 has. It is prone to overheating at steady speed
cruise as well as steep climbs. He improvised some plywood pieces held in
with wire and tie wraps, when on a trip in Southern California. They
lowered the operating temps by enough to allow him to travel without
stopping. I now own that coach, and before it goes back on the road, it
will have reproduced air deflectors like the ones on my 78. Also needs a
new front lower cap and grill, thanks to a deer that was in the wrong place
at the same time as the coach. Then we will see how effective those
deflectors are.
Jim Hupy
Salem, Oregon
On Sat, Dec 25, 2021, 7:55 AM John R. Lebetski
wrote:
> They may help with venting heat soak at shut down. That’s all. The rest is
> owner feel good because they feel hot air coming out. The engine room,
> unlike a boat has no floor and is wide open. The air that enters the
> radiator is the same temp with or without the vents. Yes the engine room
> area
> tends to trap air underneath and become higher pressure, but if you look
> at the cross sectional area of the vents compared to the radiator and CFM
> the
> fan CAN move, it’s not a helpful factor. Not only that on most vent jobs,
> cut that area by 50% as only half if the vent functions due to step
> intrusion. The biggest help in cooling for me was the Flowkooler 195
> stat, and the under core support air deflector, both from Applied.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
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| Re: Shark Vents [message #368195 is a reply to message #368179] |
Sat, 25 December 2021 10:49 |
jricke
Messages: 29
Registered: June 2007
Location: Arden Hills, MN
Karma: 0
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Junior Member |
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Tom,
Another data point:
This is certainly a subjective observation on my part but here goes:
Without vents kids and dog would not sit on the engine hatch (kids said it was too hot, dog did not comment). After vents were installed, all found the hatch an acceptable perch.
I did some work that required removal of inner fender liners and never got around to reinstalling. Even cooler now, in my opinion (though stainless vents are now for 'show' only).
Joe
Joe Ricke - KE0CPM
Arden Hills, MN
'77 Transmode
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| [GMCnet] Re: Shark Vents [message #368196 is a reply to message #368194] |
Sat, 25 December 2021 11:50 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Jim,
With the first 455 you built and a new high efficiency copper brass core in
the radiator, ceramic coated headers, Springfield ignition/ distributor,
Howell TBI W EBL, front mounted trans cooler, no ac condenser The rig would
drive around town and sit in traffic for hours in hot weather and the temps
would never get above 195. On the freeway however temps would steadily
climb in step with travel speed over 55 mph. At 65-70 mph the temps would
drift into the 210-220 range. After mention of the missing air deflectors
behind the grill( I believe it was you who suggested to improvise them if
they were absent) I went about a “temporary “ install of thin plywood
sheets cut to fit behind the grill to direct the air through the radiator.
$29 and an hour or so later at my brother in laws house in Hollywood they
were installed. On the trip home to Washington temps never went over 200 on
the interstate despite my travel speeds which at times were in the 80 mph
range.
Sully
Bellevue wa
On Sat, Dec 25, 2021 at 8:28 AM James Hupy wrote:
> The very last coaches with the 403 engines had the best air deflectors in
> front of the radiator. There are many pieces involved, some are sheet
> metal, and some are a flexible material similar to truck mud flaps. None of
> the air that enters the grill area is left undirected. It all goes through
> the evaporator of the A.C. and then through the radiator core.
> Todd Sullivan's coach was a 77 with a 455. It contains none of the
> air deflectors that my 78 has. It is prone to overheating at steady speed
> cruise as well as steep climbs. He improvised some plywood pieces held in
> with wire and tie wraps, when on a trip in Southern California. They
> lowered the operating temps by enough to allow him to travel without
> stopping. I now own that coach, and before it goes back on the road, it
> will have reproduced air deflectors like the ones on my 78. Also needs a
> new front lower cap and grill, thanks to a deer that was in the wrong place
> at the same time as the coach. Then we will see how effective those
> deflectors are.
> Jim Hupy
> Salem, Oregon
>
> On Sat, Dec 25, 2021, 7:55 AM John R. Lebetski
> wrote:
>
>> They may help with venting heat soak at shut down. That’s all. The rest
> is
>> owner feel good because they feel hot air coming out. The engine room,
>> unlike a boat has no floor and is wide open. The air that enters the
>> radiator is the same temp with or without the vents. Yes the engine room
>> area
>> tends to trap air underneath and become higher pressure, but if you look
>> at the cross sectional area of the vents compared to the radiator and CFM
>> the
>> fan CAN move, it’s not a helpful factor. Not only that on most vent jobs,
>> cut that area by 50% as only half if the vent functions due to step
>> intrusion. The biggest help in cooling for me was the Flowkooler 195
>> stat, and the under core support air deflector, both from Applied.
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Re: Shark Vents [message #368197 is a reply to message #368196] |
Sat, 25 December 2021 13:29 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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My first GMC (1975 Avion), a P.O. has installed an elaborate relay controlled axial fan aimed to exhaust out the shark vents. Worked very effectively, especially down here in the South. I had to remove the control system and just used an operator toggle switch. When the temp gauge (real VDO gauge) showed an increase in engine compartment temps, I just flipped the switch. Instant cooling.
I would do a simple re-design, using an Ardunio to operate automatically, based on engine temps. I would also add a high range cut-off and a flame detector to detect engine fires. Cost would be about $30.
Merry Christmas and a much Happier 2022.
See you in Patterson.
Tom, Where it is going into the high 70's for Christmas.
2012 Phoenix Cruiser model 2552
KA4CSG
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| [GMCnet] Re: Shark Vents [message #368198 is a reply to message #368196] |
Sat, 25 December 2021 13:06 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I remembered the situation but not the exact temps involved. So, I was
vague on purpose about them. But the crude improvised plywood pieces, which
were done on the road under duress, did exactly what you needed done. No
criticism was intended. But the collision with the deer pretty much
finished them off. I have all the pieces in my 78 to copy and reproduce for
the "war pig".
I am also going to install Sniper Quadrajet Fuel injection with a
Sniper Distributor that is controlled by the Sniper controller. Similar to
the EBL but it lacks the knock sensor.
I really like having a 4 throat throttle body that bolts in place
without that "mickey mouse" adapter under the 2 throat holley or GM
injector body. Stock air cleaner can now easily be used, or a jeep snorkle
and round tubing to connect with the air cleaner element that you used.
Might find a place closer to the front of the coach to mount it into cool
fresh air. We will see.
Jim Hupy
Salem, Oregon
On Sat, Dec 25, 2021, 9:50 AM Todd Sullivan wrote:
> Jim,
>
> With the first 455 you built and a new high efficiency copper brass core in
> the radiator, ceramic coated headers, Springfield ignition/ distributor,
> Howell TBI W EBL, front mounted trans cooler, no ac condenser The rig would
> drive around town and sit in traffic for hours in hot weather and the temps
> would never get above 195. On the freeway however temps would steadily
> climb in step with travel speed over 55 mph. At 65-70 mph the temps would
> drift into the 210-220 range. After mention of the missing air deflectors
> behind the grill( I believe it was you who suggested to improvise them if
> they were absent) I went about a “temporary “ install of thin plywood
> sheets cut to fit behind the grill to direct the air through the radiator.
> $29 and an hour or so later at my brother in laws house in Hollywood they
> were installed. On the trip home to Washington temps never went over 200 on
> the interstate despite my travel speeds which at times were in the 80 mph
> range.
>
> Sully
> Bellevue wa
>
> On Sat, Dec 25, 2021 at 8:28 AM James Hupy wrote:
>
>> The very last coaches with the 403 engines had the best air deflectors in
>> front of the radiator. There are many pieces involved, some are sheet
>> metal, and some are a flexible material similar to truck mud flaps. None
> of
>> the air that enters the grill area is left undirected. It all goes
> through
>> the evaporator of the A.C. and then through the radiator core.
>> Todd Sullivan's coach was a 77 with a 455. It contains none of the
>> air deflectors that my 78 has. It is prone to overheating at steady speed
>> cruise as well as steep climbs. He improvised some plywood pieces held in
>> with wire and tie wraps, when on a trip in Southern California. They
>> lowered the operating temps by enough to allow him to travel without
>> stopping. I now own that coach, and before it goes back on the road, it
>> will have reproduced air deflectors like the ones on my 78. Also needs a
>> new front lower cap and grill, thanks to a deer that was in the wrong
> place
>> at the same time as the coach. Then we will see how effective those
>> deflectors are.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Sat, Dec 25, 2021, 7:55 AM John R. Lebetski
>> wrote:
>>
>>> They may help with venting heat soak at shut down. That’s all. The rest
>> is
>>> owner feel good because they feel hot air coming out. The engine room,
>>> unlike a boat has no floor and is wide open. The air that enters the
>>> radiator is the same temp with or without the vents. Yes the engine
> room
>>> area
>>> tends to trap air underneath and become higher pressure, but if you
> look
>>> at the cross sectional area of the vents compared to the radiator and
> CFM
>>> the
>>> fan CAN move, it’s not a helpful factor. Not only that on most vent
> jobs,
>>> cut that area by 50% as only half if the vent functions due to step
>>> intrusion. The biggest help in cooling for me was the Flowkooler 195
>>> stat, and the under core support air deflector, both from Applied.
>>> --
>>> John Lebetski
>>> Woodstock, IL
>>> 77 Eleganza II
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>> _______________________________________________
>> GMCnet mailing list
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>>
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| Re: Shark Vents [message #368199 is a reply to message #368179] |
Sat, 25 December 2021 14:37 |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
|
Senior Member |
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Guys,
Thank you all for all the very good input. Based on what I am hearing is that at worst they are decoration. At best with proper baffling and directing ram air they may possibly lower engine and engine compartment temps. A engine fire extinguisher appears to be a good thought as well as any ram air will fan a fire which may already have plenty of fuel.
I believe I will construct air duct/baffle's out of aluminum sheet goods and flexible leading edges at the grill. I hate to cut but I may install the shark vents and I will put the plastic wheel wells back in to take care of road debris.
Jim H. After military service I ended up as an automotive adjuster for 2 company for several years. I remember a dear collision where I even had to replace the Dear Whistles. Both the owner and I laughed at the thought, but it was a way I could get more money to the owner. I am Sure he appreciated it and most likely he never replaced the Dear Whistles. Life is Good.
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| [GMCnet] Re: Shark Vents [message #368210 is a reply to message #368180] |
Sun, 26 December 2021 10:48 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
|
Senior Member |
|
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Sully
Actually I am the one who determined that the fender liner acted like an airplane wing. It is spaced down from the floor and airflow over it created a vacuum which draws hot air from the engine compartment and pushes it down to the rear of the liner.
Emery Stora
emerystora@mac.com
> On Dec 24, 2021, at 4:02 PM, Todd Sullivan wrote:
>
> My recollection of engine cooling discussions here is that the plastic
> fender liners that many remove to simplify other repairs are designed to
> not only stop water and debris from getting into the engine bay but to draw
> air out of the engine compartment. I think it was Gene Fisher who
> researched this. That said if you are going to cut the body and install the
> “gills “ do it where it looks best because I’m not convinced that they will
> make a big impact of cooling.
>
> Sully
> Bellevue wa
> On Fri, Dec 24, 2021 at 2:13 PM wrote:
>
>> Merry Christmas All,
>>
>> I will be at a point of cutting for the shark type engine vents. My
>> question is as follows: with all the years of installing these vent, have
>> they
>> proven to be effective at cooling the engine?
>>
>> Thanks all and have a Merry Christmas,
>> Tom and Oki K.
>>
>> --
>> Tom & Oki Katzenberger,
>> Kingsville, Maryland,
>> 1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control,
>> Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee
>> Ignition
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
> _______________________________________________
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> Unsubscribe or Change List Options:
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| [GMCnet] Re: Shark Vents [message #368211 is a reply to message #368210] |
Sun, 26 December 2021 13:35 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
|
Senior Member |
|
|
My bad Emery!
Sully
Bellevue wa
On Sun, Dec 26, 2021 at 8:49 AM Emery Stora via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Sully
> Actually I am the one who determined that the fender liner acted like an
> airplane wing. It is spaced down from the floor and airflow over it
> created a vacuum which draws hot air from the engine compartment and pushes
> it down to the rear of the liner.
>
> Emery Stora
> emerystora@mac.com
>
>
>
>> On Dec 24, 2021, at 4:02 PM, Todd Sullivan wrote:
>>
>> My recollection of engine cooling discussions here is that the plastic
>> fender liners that many remove to simplify other repairs are designed to
>> not only stop water and debris from getting into the engine bay but to
> draw
>> air out of the engine compartment. I think it was Gene Fisher who
>> researched this. That said if you are going to cut the body and install
> the
>> “gills “ do it where it looks best because I’m not convinced that they
> will
>> make a big impact of cooling.
>>
>> Sully
>> Bellevue wa
>> On Fri, Dec 24, 2021 at 2:13 PM wrote:
>>
>>> Merry Christmas All,
>>>
>>> I will be at a point of cutting for the shark type engine vents. My
>>> question is as follows: with all the years of installing these vent,
> have
>>> they
>>> proven to be effective at cooling the engine?
>>>
>>> Thanks all and have a Merry Christmas,
>>> Tom and Oki K.
>>>
>>> --
>>> Tom & Oki Katzenberger,
>>> Kingsville, Maryland,
>>> 1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark
> Control,
>>> Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee
>>> Ignition
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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| Re: [GMCnet] Re: Shark Vents [message #368277 is a reply to message #368211] |
Sat, 01 January 2022 13:19 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
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Save me the tine. Anyone (Emory, JimK ) got a reasonably controlled set of temps before and after liners and vents?
thanks
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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