Home » Public Forums » GMCnet » Tips for installing engine vents (Tips for installing engine vents)
| Tips for installing engine vents [message #364669] |
Sun, 13 June 2021 17:05  |
Ken M
Messages: 32
Registered: December 2019
Location: Redding, CA
Karma: 0
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I bought some stainless engine vents from Sirum and am looking for tips on cutting the hole to install. I’ve seen the tips for installing as high as possible, and as far back as possible. I’m thinking of figuring out the best placement, then putting masking tape down where the cut will go, then drawing the cut outline over the tape. Drill or hole saw the corners, then a dremel with a diamond disk blade for cutting the rest. Any other pointers? I want to get it right, as there aren’t really any do-overs!
1975 - 26’ Eleganza II
Unsure of what upgrades may have been done. I'm working on sorting that out in the coming months.
Ken Morefield - Redding, CA
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| Re: Tips for installing engine vents [message #364670 is a reply to message #364669] |
Sun, 13 June 2021 18:15  |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Ken,
It looks as though you have done a great job thinking through this. I can only say attention to measurements, mark the masking tape and double check before drilling and cutting.
I can't think of any thing I would do differently.
Make sure you check the back side that you are clear of anything structural or the like.
Good luck,
Tom 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: Tips for installing engine vents [message #364671 is a reply to message #364669] |
Sun, 13 June 2021 18:05 |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
Karma: 2
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Drilling a hole in the corners is a good idea. A jigsaw (saber saw) will work just as well and might be faster than a Dremel.
Emery Stora
> On Jun 13, 2021, at 4:06 PM, Ken Morefield wrote:
>
> I bought some stainless engine vents from Sirum and am looking for tips on cutting the hole to install. I’ve seen the tips for installing as high
> as possible, and as far back as possible. I’m thinking of figuring out the best placement, then putting masking tape down where the cut will go,
> then drawing the cut outline over the tape. Drill or hole saw the corners, then a dremel with a diamond disk blade for cutting the rest. Any other
> pointers? I want to get it right, as there aren’t really any do-overs!
> --
> 1975 - 26’ Eleganza II
> Unsure of what upgrades may have been done. I'm working on sorting that out in the coming months.
> Ken Morefield - Redding, CA
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Re: Tips for installing engine vents [message #364672 is a reply to message #364671] |
Sun, 13 June 2021 19:19 |
mghamms
Messages: 466
Registered: March 2016
Location: Ware, Massachusetts
Karma: 2
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I would drill a hole, or two, somewhere in the center to probe and double check that the placement is good.
Best to start with a small hole first. easy to make it bigger and modify the location.
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
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| Re: Tips for installing engine vents [message #364673 is a reply to message #364669] |
Sun, 13 June 2021 20:12 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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I can’t tell you how many hours I’ve sat underneath the front quarter panels eyeballing where to cut. I will only cut flat panels, nothing with a 90 degree angle on it.. I just don’t see the logic in cutting.. it would only be a couple inch of vent effectiveness to where the wheel well insert is. And that is with the long/skinny and/or shorter/wider vents. But to be honest, I was only looking at the rear area in the quarter panel.
If anyone has data to justify cutting, I am all ears.
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| [GMCnet] Re: Tips for installing engine vents [message #364674 is a reply to message #364673] |
Sun, 13 June 2021 20:38 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Multi-tool is your friend here.
Milwaukee M12 12-Volt Lithium-Ion Cordless Oscillating Multi-Tool
(Tool-Only)-2426-20 - The Home Depot
On Sun, Jun 13, 2021 at 7:13 PM Scott Nutter wrote:
> I can’t tell you how many hours I’ve sat underneath the front quarter
> panels eyeballing where to cut. I will only cut flat panels, nothing with a
> 90 degree angle on it.. I just don’t see the logic in cutting.. it would
> only be a couple inch of vent effectiveness to where the wheel well insert
> is. And that is with the long/skinny and/or shorter/wider vents. But to
> be honest, I was only looking at the rear area in the quarter panel.
> If anyone has data to justify cutting, I am all ears.
> Scott.
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
> installed MSD Atomic EFI
> Houston, Texas
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Bruce Hart
1976 Palm Beach
LaGrange, Wyoming
GMC=Genetically Modified Chevy
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| [GMCnet] Re: Tips for installing engine vents [message #364676 is a reply to message #364674] |
Mon, 14 June 2021 00:17 |
richshoop
Messages: 190
Registered: April 2017
Karma: 0
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Before you buy ANY look a like Multi-tool.... Be sure to test it in the material you intend to cut. Some of them vibrate the handle more than the blade! If you have ever used an original Fein Multi-tool, you will be hard pressed to buy anything else.
I did eventually buy a battery powered one and got a dewalt 20V lithium battery powered one and it is ok. But if I need to cut something tough, I drag out the extension cord and use the Fein. Saw blades for these things are also expensive.
> On 06/13/2021 6:38 PM Bruce Hart wrote:
>
>
> Multi-tool is your friend here.
>
> Milwaukee M12 12-Volt Lithium-Ion Cordless Oscillating Multi-Tool
> (Tool-Only)-2426-20 - The Home Depot
>
>
> On Sun, Jun 13, 2021 at 7:13 PM Scott Nutter wrote:
>
>> I can’t tell you how many hours I’ve sat underneath the front quarter
>> panels eyeballing where to cut. I will only cut flat panels, nothing with a
>> 90 degree angle on it.. I just don’t see the logic in cutting.. it would
>> only be a couple inch of vent effectiveness to where the wheel well insert
>> is. And that is with the long/skinny and/or shorter/wider vents. But to
>> be honest, I was only looking at the rear area in the quarter panel.
>> If anyone has data to justify cutting, I am all ears.
>> Scott.
>> --
>> Scott Nutter
>> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
>> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
>> installed MSD Atomic EFI
>> Houston, Texas
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
> Bruce Hart
> 1976 Palm Beach
> LaGrange, Wyoming
> GMC=Genetically Modified Chevy
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| [GMCnet] Re: Tips for installing engine vents [message #364677 is a reply to message #364669] |
Mon, 14 June 2021 00:23 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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I would consider using a large hole saw at each end so there are no stress
corners.
On Sun, Jun 13, 2021 at 10:17 PM RICHARD/MARLI SHOOP
wrote:
> Before you buy ANY look a like Multi-tool.... Be sure to test it in the
> material you intend to cut. Some of them vibrate the handle more than the
> blade! If you have ever used an original Fein Multi-tool, you will be hard
> pressed to buy anything else.
>
> I did eventually buy a battery powered one and got a dewalt 20V lithium
> battery powered one and it is ok. But if I need to cut something tough, I
> drag out the extension cord and use the Fein. Saw blades for these things
> are also expensive.
>> On 06/13/2021 6:38 PM Bruce Hart wrote:
>>
>>
>> Multi-tool is your friend here.
>>
>> Milwaukee M12 12-Volt Lithium-Ion Cordless Oscillating Multi-Tool
>> (Tool-Only)-2426-20 - The Home Depot
>> https://www.homedepot.com/p/Milwaukee-M12-12-Volt-Lithium-Ion-Cordless-Oscillating-Multi-Tool-Tool-Only-2426-20/203111676?mtc=Shopping-B-F_D25T-B-D25T -25_9_PORTABLE_POWER-Multi-NA-Feed-LIA-NA-NA-PortablePower&cm_mmc=Shopping-B-F_D25T-B-D25T-25_9_PORTABLE_POWER-Multi-NA-Feed-LIA-NA-NA-PortablePow er-71700000071858267-58700006317203701-92700062668014077&gclid=872c0b18305e10c50a656bde811c6a67&gclsrc=3p.ds&msclkid=872c0b18305e10c50a656 bde811c6a67#overlay
>>
>>
>> On Sun, Jun 13, 2021 at 7:13 PM Scott Nutter
> wrote:
>>
>>> I can’t tell you how many hours I’ve sat underneath the front quarter
>>> panels eyeballing where to cut. I will only cut flat panels, nothing
> with a
>>> 90 degree angle on it.. I just don’t see the logic in cutting.. it
> would
>>> only be a couple inch of vent effectiveness to where the wheel well
> insert
>>> is. And that is with the long/skinny and/or shorter/wider vents. But
> to
>>> be honest, I was only looking at the rear area in the quarter panel.
>>> If anyone has data to justify cutting, I am all ears.
>>> Scott.
>>> --
>>> Scott Nutter
>>> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21
> final
>>> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
>>> installed MSD Atomic EFI
>>> Houston, Texas
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>>
>>
>> --
>> Bruce Hart
>> 1976 Palm Beach
>> LaGrange, Wyoming
>> GMC=Genetically Modified Chevy
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| [GMCnet] Re: Tips for installing engine vents [message #364679 is a reply to message #364669] |
Mon, 14 June 2021 06:17 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I'd leave mine like it's been for the past 45 years -- with no vents. I
have only the outer half of each front wheel well liner in place, so maybe
my engine compartment cooling doesn't require side vents, but it seems to
stay pretty cool.
JWID,
Ken H.
On Sun, Jun 13, 2021 at 6:05 PM Ken Morefield
wrote:
> I bought some stainless engine vents from Sirum and am looking for tips on
> cutting the hole to install. I’ve seen the tips for installing as high
> as possible, and as far back as possible. I’m thinking of figuring out
> the best placement, then putting masking tape down where the cut will go,
> then drawing the cut outline over the tape. Drill or hole saw the
> corners, then a dremel with a diamond disk blade for cutting the rest. Any
> other
> pointers? I want to get it right, as there aren’t really any do-overs!
> --
> 1975 - 26’ Eleganza II
> Unsure of what upgrades may have been done. I'm working on sorting that
> out in the coming months.
> Ken Morefield - Redding, CA
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| [GMCnet] Re: Tips for installing engine vents [message #364699 is a reply to message #364677] |
Mon, 14 June 2021 13:53 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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I just don't run the fender liners, Maybe someday I'll put them back in
________________________________
From: John Phillips
Sent: Monday, June 14, 2021 12:23 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Tips for installing engine vents
I would consider using a large hole saw at each end so there are no stress
corners.
On Sun, Jun 13, 2021 at 10:17 PM RICHARD/MARLI SHOOP
wrote:
> Before you buy ANY look a like Multi-tool.... Be sure to test it in the
> material you intend to cut. Some of them vibrate the handle more than the
> blade! If you have ever used an original Fein Multi-tool, you will be hard
> pressed to buy anything else.
>
> I did eventually buy a battery powered one and got a dewalt 20V lithium
> battery powered one and it is ok. But if I need to cut something tough, I
> drag out the extension cord and use the Fein. Saw blades for these things
> are also expensive.
>> On 06/13/2021 6:38 PM Bruce Hart wrote:
>>
>>
>> Multi-tool is your friend here.
>>
>> Milwaukee M12 12-Volt Lithium-Ion Cordless Oscillating Multi-Tool
>> (Tool-Only)-2426-20 - The Home Depot
>> https://www.homedepot.com/p/Milwaukee-M12-12-Volt-Lithium-Ion-Cordless-Oscillating-Multi-Tool-Tool-Only-2426-20/203111676?mtc=Shopping-B-F_D25T-B-D25T -25_9_PORTABLE_POWER-Multi-NA-Feed-LIA-NA-NA-PortablePower&cm_mmc=Shopping-B-F_D25T-B-D25T-25_9_PORTABLE_POWER-Multi-NA-Feed-LIA-NA-NA-PortablePow er-71700000071858267-58700006317203701-92700062668014077&gclid=872c0b18305e10c50a656bde811c6a67&gclsrc=3p.ds&msclkid=872c0b18305e10c50a656 bde811c6a67#overlay
>>
>>
>> On Sun, Jun 13, 2021 at 7:13 PM Scott Nutter
> wrote:
>>
>>> I can’t tell you how many hours I’ve sat underneath the front quarter
>>> panels eyeballing where to cut. I will only cut flat panels, nothing
> with a
>>> 90 degree angle on it.. I just don’t see the logic in cutting.. it
> would
>>> only be a couple inch of vent effectiveness to where the wheel well
> insert
>>> is. And that is with the long/skinny and/or shorter/wider vents. But
> to
>>> be honest, I was only looking at the rear area in the quarter panel.
>>> If anyone has data to justify cutting, I am all ears.
>>> Scott.
>>> --
>>> Scott Nutter
>>> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21
> final
>>> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
>>> installed MSD Atomic EFI
>>> Houston, Texas
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>>
>>
>> --
>> Bruce Hart
>> 1976 Palm Beach
>> LaGrange, Wyoming
>> GMC=Genetically Modified Chevy
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
*John Phillips*
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: Tips for installing engine vents [message #364700 is a reply to message #364669] |
Mon, 14 June 2021 14:20 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Seems like an absolute waste. If that air does not exit there, it simple exits under the coach. Radiator temp not changed as intake air same. Plus the boat vents are the WRONG format as too long. Only half of it is functional as rest is blocked once installed, which is then too small to even help. It’s totally a “makes you think it helps” thing. The Explorer brand conversion GM conversion vans have a much better (taller less long) shaped vent that would be a better choice if ever to consider. Rant over. Pictures at explorervan.com
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Mon, 14 June 2021 14:23] Report message to a moderator |
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| Re: Tips for installing engine vents [message #364701 is a reply to message #364669] |
Mon, 14 June 2021 14:34 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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Ive mulled this over as well....no extra holes for me yet....my post on here even discussed the possibility of using fans to assist the vents.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Tips for installing engine vents [message #364775 is a reply to message #364701] |
Thu, 17 June 2021 08:22 |
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 had a nice set of engine vents installed. Little known to my new guy status, there was a typical marine compartment axial blower ( driver side) installed to power vent the engine compartment. It had an elaborate electronic control panel consisting of era specific relays, sensors, etc. to control the engaging of the motor of the powered vent. I did have a hand sketch of the wiring, but was of dubious value.
I was pumping gas the first time I encountered it in action. Thought the coach was on fire.
I replaced the wiring with a simple dash switch. Engaging the axial blower would drop the temperature gauge immediately. Worked very nicely in the Hot Deep South Summers.
2012 Phoenix Cruiser model 2552
KA4CSG
[Updated on: Thu, 17 June 2021 08:23] Report message to a moderator |
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| [GMCnet] Re: Tips for installing engine vents [message #364800 is a reply to message #364795] |
Thu, 17 June 2021 14:31 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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When installed on boats, one is installed facing
forward (for intake) and the other is installed
facing rearward (for exhaust) to vent any fumes
from the engine room. while the boat is in motion.
Engine room blowers (to prevent explosions of fuel
fumes) take air from the intakes and push the fumes
to the exhaust outlet.
The operator is supposed to run the blowers for five
minutes after refueling before restarting the engines.
This is for noise abatement (grin) of the noise create
by explosions.
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: Larry
Sent: Thursday, June 17, 2021 13:58
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Tips for installing engine vents
powwerjon wrote on Thu, 17 June 2021 11:42
> This is the one vent that I have seen in the last 20 years or so and the one that I have on the coaches that We have owned. IMPO it is the best
> one to use.
>
> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.westmarine.com%2Fbuy%2Fattwood--stainless-steel-louvered-vent--1364900& ;data=04%7C01%7C%7Cc7539d3e752d493de3cc08d931c25855%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637595533035436774%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC 4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=LOPqSOlcxzEu2aaA5FQ8paGNFxX2C%2BW5bZ33Cz3WVGE%3D&reserved=0
>
> At one time there used to be a how to on installation but have not found it.
>
> J.R. Wright
> GMC Great Laker MHC
> GMCGL Tech Editor
> GMC Eastern States Charter Member
> GMCMI
> 78 GMC Buskirk 29.5’ Stretch
> 75 GMC Avion (Under Reconstruction)
> Michigan
That is the one I have on our coach. WOW, 15 yrs ago it did not cost that much! When on the road, and we stop for fuel, I can feel the heat coming
out those vents. At least, standing still, they sure seem to work. Can't speak for traveling down the road. JMHO
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| [GMCnet] Re: Tips for installing engine vents [message #364805 is a reply to message #364801] |
Thu, 17 June 2021 15:31 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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You might try reversing one and see if it helps.
That is just the way it is done on ALL boats.
Mac Macdonald in OKC, OK
'76 ex Palm Beach, now mongrel
Sent from my iPad
> On Jun 17, 2021, at 15:25, Larry wrote:
>
> k2gkk wrote on Thu, 17 June 2021 14:31
>> When installed on boats, one is installed facing
>> forward (for intake) and the other is installed
>> facing rearward (for exhaust) to vent any fumes
>> from the engine room. while the boat is in motion.
>
> Soooo, we actually have one of the vents installed wrong? Got both of mine facing back.....????
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
> _______________________________________________
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| Re: Tips for installing engine vents [message #364806 is a reply to message #364669] |
Thu, 17 June 2021 16:46 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Uhhh reversing one would increase static pressure in engine room and compete with radiator air flow. Though any and all of this is probably immeasurable especially when clutch fan is engaged.
John Lebetski
Woodstock, IL
77 Eleganza II
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