What would be the effect of longer runners?
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Senior Member
Joined: Jul 2009
Posts: 752
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Car: 1991 Z28
Engine: 5.7 TPI
Transmission: 700R4
What would be the effect of longer runners?
My apologies if this is a silly question, but I am new to this engine. What would be the effect of using TPI runners that are 1" or 2" longer? Do you have to do any tuning to compensate?
Any feedback would be appreciated...
Any feedback would be appreciated...
Member
Joined: Dec 2011
Posts: 122
Likes: 2
From: Toledo, Ohio
Car: '87 GTA Black/Black/Gold & others
Engine: TPI 350" & others
Transmission: Many
Axle/Gears: Many
Re: What would be the effect of longer runners?
.. The power band of the engine would be lowered a few hundred RPMs from where it is now.. torque might be enhanced a bit, but peak a couple/three hundred RPMs lower..
.. The current runners are already considered too long for engines bigger than 305 cubic inches... and hold down HP above 4500 RPMs on bigger engines...
.. '91 TPIs are MAP and don't self-compensate well to changes...
.. The current runners are already considered too long for engines bigger than 305 cubic inches... and hold down HP above 4500 RPMs on bigger engines...
.. '91 TPIs are MAP and don't self-compensate well to changes...
Last edited by BuzzLOL; Dec 29, 2011 at 11:18 PM.
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Member
Joined: Dec 2011
Posts: 122
Likes: 2
From: Toledo, Ohio
Car: '87 GTA Black/Black/Gold & others
Engine: TPI 350" & others
Transmission: Many
Axle/Gears: Many
Re: What would be the effect of longer runners?
.. Those early 1960's Chrysler crosss rams came in a low RPM street version with full 30" runners and a race version with each pair of runners cast siamesed together for the first 15"...
Joined: Oct 2001
Posts: 12,221
Likes: 1,141
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: What would be the effect of longer runners?
And cold start on those older carbed cars was nasty due to fuel puddling under the carb..
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