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| [GMCnet] Exhaust Size [message #300899] |
Fri, 20 May 2016 21:38  |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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I found this very informative (and confirmation of the 3” exhaust system the PO installed)
Enjoy.
Dolph
DE N8JPC
Wheeling, West Virginia
1977 26’ ex-PalmBeach
1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010
“The Aluminum and Fiberglass Mistress"
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| Re: [GMCnet] Exhaust Size [message #300900 is a reply to message #300899] |
Fri, 20 May 2016 21:55  |
Dennis S
Messages: 3046
Registered: November 2005
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Dolph
I suspect you intended to include a link.
Dennis
Dolph Santorine wrote on Fri, 20 May 2016 21:38I found this very informative (and confirmation of the 3" exhaust system the PO installed)
Enjoy.
Dolph
DE N8JPC
Wheeling, West Virginia
1977 26' ex-PalmBeach
1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010
"The Aluminum and Fiberglass Mistress"
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Exhaust Size [message #300901 is a reply to message #300900] |
Fri, 20 May 2016 22:08 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Yep.
10 Fingers. All thumbs.
Here!
https://www.youtube.com/watch?v=_PVXvHkr-Vs&list=PLGvTvFzdMg_O2T3UdUEt5dIHutSOu7srE
> On May 20, 2016, at 10:55 PM, Dennis Sexton wrote:
>
> Dolph
>
> I suspect you intended to include a link.
>
> Dennis
>
> Dolph Santorine wrote on Fri, 20 May 2016 21:38
>> I found this very informative (and confirmation of the 3" exhaust system the PO installed)
>>
>> Enjoy.
>>
>> Dolph
>>
>> DE N8JPC
>>
>> Wheeling, West Virginia
>>
>> 1977 26' ex-PalmBeach
>> 1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010
>>
>> "The Aluminum and Fiberglass Mistress"
>>
>>
>>
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> Dennis S
> 73 Painted Desert 230
> Memphis TN Metro
>
> _______________________________________________
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| Re: [GMCnet] Exhaust Size [message #300903 is a reply to message #300901] |
Sat, 21 May 2016 01:02 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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The video applies to high performance.
Our Headers are small tube ad Y design to aid in low end rpm( 2200-3200
RPM) and goes into a 2.5" muffler and Y into a 3".
All the bends are Mandrel bent so the diameter is not compromised.
Jerry Jarden designed the original system and did a Dyno test.
On Fri, May 20, 2016 at 8:08 PM, Dolph Santorine
wrote:
> Yep.
>
> 10 Fingers. All thumbs.
>
> Here!
>
>
> https://www.youtube.com/watch?v=_PVXvHkr-Vs&list=PLGvTvFzdMg_O2T3UdUEt5dIHutSOu7srE
>
>
>
>
>> On May 20, 2016, at 10:55 PM, Dennis Sexton wrote:
>>
>> Dolph
>>
>> I suspect you intended to include a link.
>>
>> Dennis
>>
>> Dolph Santorine wrote on Fri, 20 May 2016 21:38
>>> I found this very informative (and confirmation of the 3" exhaust
> system the PO installed)
>>>
>>> Enjoy.
>>>
>>> Dolph
>>>
>>> DE N8JPC
>>>
>>> Wheeling, West Virginia
>>>
>>> 1977 26' ex-PalmBeach
>>> 1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission,
> EV-6010
>>>
>>> "The Aluminum and Fiberglass Mistress"
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
>> --
>> Dennis S
>> 73 Painted Desert 230
>> Memphis TN Metro
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.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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| Re: [GMCnet] Exhaust Size [message #300920 is a reply to message #300899] |
Sat, 21 May 2016 13:13 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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At WOT yes the 3" better. At our cruise range the conclusion I come to is the opposite. Yes wish the graph started at 1500 legibly to get data that pertains to GMC.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Exhaust Size [message #300947 is a reply to message #300899] |
Sat, 21 May 2016 21:20 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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And they had a long truck system. But ours is even longer. At our RPM range we just are not moving that volume.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Exhaust Size [message #300955 is a reply to message #300902] |
Sat, 21 May 2016 23:05 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Senior Member |
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Great video find.
Hot Rods don't have to deal with changing altitudes.
I don't listen to Cassettes anymore. I kind of feel the same about how I atomize my fuel.
Dolph Santorine
DE N8JPC
Wheeling, West Virginia
1977 ex-Palm Beach TZE167V100820
1-ton, Sullybuilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010,
> On May 20, 2016, at 11:48 PM, Ken Henderson wrote:
>
> This on the same site was sorta interesting too:
>
> https://www.youtube.com/watch?v=2sQJPZYSoUI&list=PLGvTvFzdMg_O2T3UdUEt5dIHutSOu7srE&index=8
>
> Ken EFIAddicted H.
>
>
> On Fri, May 20, 2016 at 11:08 PM, Dolph Santorine
> wrote:
>
>> Yep.
>>
>> 10 Fingers. All thumbs.
>>
>> Here!
>>
>>
>> https://www.youtube.com/watch?v=_PVXvHkr-Vs&list=PLGvTvFzdMg_O2T3UdUEt5dIHutSOu7srE
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Exhaust Size [message #300976 is a reply to message #300899] |
Sun, 22 May 2016 13:22 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Engines are made up of components that are sized to do a task. Operate in certain RPM ranges. Move something that is in a particular load range. Engines are really just an air pump. In our case. GM sized, and designed components such the exhaust, carburetor, distributor, cam, and even the water pump. To do the job of moving these GMC's down the road in an efficient manner. Yes. We put EFI systems on. But their just a more controlled carburetor that wasn't available back then. So to make any changes. You need to keep in mind it's a total package. These GMC's aren't high revving units. There just isn't that much exhaust coming out the tailpipe. If you're looking for better mileage, more torque to the wheels, lower transmission temps, and transmission load. Put that exhaust money in a 3:70 final drive from Applied GMC. And NO. That power drive isn't the same thing. It just increase the engine RPM's.Bob Dunahugh78 Royale
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| Re: [GMCnet] Exhaust Size [message #300984 is a reply to message #300899] |
Sun, 22 May 2016 16:02 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Am I missing something here, Bob? It looks as if we increase engine speed relative to wheel sped either way, do we not? The difference being whether we wish to speed up the transmission as well, or not, isn't it?
--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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| Re: [GMCnet] Exhaust Size [message #300989 is a reply to message #300984] |
Sun, 22 May 2016 16:53 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I had to replace the engine in my GMC before I even brought it home in
'98. That was before JimK's 3.55, etc., became available, so I installed
Caspro's 3.50 chain drive. I'd do it again without hesitation. It was a
simple, economical solution in that situation, and it proved to be quieter
than any higher ratio final drive I've heard. It's been pretty well proven
that the TH425 can take a lot more torque than that (3.50/3.07=1.14) 14%
increase.
That's NOT to imply that I'm in any way disappointed with JimK's 3.55 that
I've been running for the past 80,000+ miles.
Ken H.
On Sun, May 22, 2016 at 5:02 PM, Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Am I missing something here, Bob? It looks as if we increase engine speed
> relative to wheel sped either way, do we not? The difference being whether
> we wish to speed up the transmission as well, or not, isn't it?
>
> --johnny
>
> --
> '76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and
> add - ons.
> Braselton, Ga.
>
> "Sometimes I wonder what tomorrow's gonna bring when I think about my
> dirty life and times" --Warren Zevon
>
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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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| Re: [GMCnet] Exhaust Size [message #301004 is a reply to message #300976] |
Mon, 23 May 2016 01:57 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Johnny. The power drive give will give you more revs per mile. And gives the engine the ability to apply more torque to the transmission. The 425 trans can handle that extra load. But that extra load has a by product of more heat introduced into the transmission. Were as the 3:70 final drive moves the torque multiplication to the final drive. And there is no extra heat generated at a measurable amount anywhere in the drivetrain. Plus with the transmission fluid pump running at a higher speed. More transmission fluid is sent to the trans cooler for cooling. You'll generally get better milage due to the higher engine intake manifold vacuum readings. On our last tripe. 3:70 FD, and a 403 that has absolutely no aids for cooling at all. We averaged 10.2 MPG over a distance of 3,800 miles. 2.5 exhaust with stock exhaust manifolds, and a stock carb. And that was pulling Linda's 5,100 LBS lift van behind our 78 Royale. With a GVW gross weight of about 17,300 LBS. When I'm pulling one of my Yenkos in the enclosed 24 ft trailer. I'm over 21,000 LBS GVW. And can travel at 75 all day with no cooling issues.Bob Dunahugh78 Royale
From: yenko108@hotmail.com
To: gmclist@list.gmcnet.org
Subject: RE: Exhaust Size
Date: Sun, 22 May 2016 13:22:35 -0500
Engines are made up of components that are sized to do a task. Operate in certain RPM ranges. Move something that is in a particular load range. Engines are really just an air pump. In our case. GM sized, and designed components such the exhaust, carburetor, distributor, cam, and even the water pump. To do the job of moving these GMC's down the road in an efficient manner. Yes. We put EFI systems on. But their just a more controlled carburetor that wasn't available back then. So to make any changes. You need to keep in mind it's a total package. These GMC's aren't high revving units. There just isn't that much exhaust coming out the tailpipe. If you're looking for better mileage, more torque to the wheels, lower transmission temps, and transmission load. Put that exhaust money in a 3:70 final drive from Applied GMC. And NO. That power drive isn't the same thing. It just increase the engine RPM's.Bob Dunahugh78 Royale
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