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ps2375
Samba Member
Joined: April 24, 2014
Posts: 2472
Location: Meridian,ID
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 Posted: Sun May 05, 2024 12:24 pm Post subject: Velocity stack height |
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| Am I going to be able to feel a noticeable difference in performance going from 1 7/8" stacks to 3" stacks? They'll be inside a 6" tall filter mounted on a 40 IDF with 36 vents. It's a single center mount on a 2276 motor with 10.2cr. I can't go dual carb, as there is no clearance for the intake manifolds until the upper frame rails are modified, this is a FV-based auto-x car, weighs 945# without me in it. |
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panel
Samba Member
Joined: December 02, 2001
Posts: 1099
Location: Victoria B.C. Canada
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jeffrey8164 
Samba Member
Joined: January 06, 2018
Posts: 3850
Location: Georgia
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| Posted: Sun May 05, 2024 5:34 pm Post subject: Re: Velocity stack height |
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I run dual 45’s on my 2276.
I did the complete opposite.
I went to shorter stacks and filters so I could put my decklid springs back on.
I asked CB Performance about the change and they said I may lose a couple horsepower.
No idea if that is true or not but I definitely cannot “feel” a difference.
Never had the car on a dyno so no factual data either.
Will you gain a pony or two? Can’t say.
Will you “feel” it?
More than likely not.
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QRP
Samba Member
Joined: April 27, 2008
Posts: 1720
Location: NORTH HOLLYWOOD,CA
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| Posted: Sun May 05, 2024 9:42 pm Post subject: Re: Velocity stack height |
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I don't know if you'll get any more or any less HP but a taller stack is always a good idea when running a singe.
It'll keep the fuel standoff or reversion in check.
Single IDF setups are notorious for that.
IMHO  |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7267
Location: Videbaek Denmark
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| Posted: Sun May 05, 2024 10:56 pm Post subject: Re: Velocity stack height |
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In a sgl idf set up the longer stacks usually helps with midrange fuel delivery and thereby torque.
In a dual carb set up most engine combo´s like longer, and a few like short. Usually there are about 3 lengths which work fair to good. If you hit a length which is right in between what the engine wants the thengine can be virually untunable in the midrange. This has a lot to do with the actual combo, and especially the exhaust layout.
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