Intake Runner size & low end torque?
Thread Starter
TECH Regular
Joined: Mar 2006
Posts: 471
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From: Rolesville, NC
Intake Runner size & low end torque? IIRC smaller intake runner size in heads, provide better low end torque. ie. smaller runner high velocity air flow into the cylinder.
If this is true, what would be a good seat of heads, with the smaller intake runner size?
I also under stand there are OTHER things involved too, Intake, TB, Cam selection, LTs and TUNE.
Second question a great cam ( does not need to be street friendly) for low end torque, ie out of corners in 2nd or 3rd gear. Road race not drag racing.
2500 to 6800 or 7000 redline
emissions are not an issue.
TIA
Tom
If this is true, what would be a good seat of heads, with the smaller intake runner size?
I also under stand there are OTHER things involved too, Intake, TB, Cam selection, LTs and TUNE.
Second question a great cam ( does not need to be street friendly) for low end torque, ie out of corners in 2nd or 3rd gear. Road race not drag racing.
2500 to 6800 or 7000 redline
emissions are not an issue.
TIA
Tom
IIRC smaller intake runner size in heads, provide better low end torque. ie. smaller runner high velocity air flow into the cylinder.
If this is true, what would be a good seat of heads, with the smaller intake runner size?
I also under stand there are OTHER things involved too, Intake, TB, Cam selection, LTs and TUNE.
Second question a great cam ( does not need to be street friendly) for low end torque, ie out of corners in 2nd or 3rd gear. Road race not drag racing.
2500 to 6800 or 7000 redline
emissions are not an issue.
TIA
Tom
If this is true, what would be a good seat of heads, with the smaller intake runner size?
I also under stand there are OTHER things involved too, Intake, TB, Cam selection, LTs and TUNE.
Second question a great cam ( does not need to be street friendly) for low end torque, ie out of corners in 2nd or 3rd gear. Road race not drag racing.
2500 to 6800 or 7000 redline
emissions are not an issue.
TIA
Tom
https://ls1tech.com/forums/lsx-parts-sale/829524-patriot-stage-3-lq9-heads-like-new.html
The AFR 205 was the original and arguably still one of the best examples of what your looking for. A small efficent head that flows big numbers thru the entire curve with a very modest cross section that yields big airspeed to enhance engine acceleration and low/midrange TQ.
Part throttle is especially enhanced and unfortunately that can never be quantified on the chassis dyno but experienced (and appreciated) every time you drive the vehicle.
You have been on this board a long time....I was surprised to even see this thread with you as the originator
Call me if I can be of some assistance or help you design a package around our product.
Tony
(661)257-8124 Ext. 109
Part throttle is especially enhanced and unfortunately that can never be quantified on the chassis dyno but experienced (and appreciated) every time you drive the vehicle.
You have been on this board a long time....I was surprised to even see this thread with you as the originator
Call me if I can be of some assistance or help you design a package around our product.
Tony
(661)257-8124 Ext. 109
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Brett Foote Thread Starter
TECH Regular
Joined: Mar 2006
Posts: 471
Likes: 0
From: Rolesville, NC
Read something a while ago about that smaller runners give better low end torque so I kind off though so, but want to ask to make sure.
Thanks Tony
How low of an rpm are you talking about? I'm guessing that coming out of a slow corner, you'd be at 3000rpm or so, and that puts the AFR's in a pretty sweet spot torque wise.
Thread Starter
TECH Regular
Joined: Mar 2006
Posts: 471
Likes: 0
From: Rolesville, NC
Yes 3000 to 67 - 7000 rpms. Staying about 4500 is just not practical. PPL that run lower gears but high RPMS are not really any faster, nor have better acceleration. They just break a lot of parts and have heat issues
So a great FLAT torque curve from 2800 to 4800, is far more beneficial then high hp above 6000 rpms. But if I can have the HP above 6000 too, I will take it.
Remember guys most road races are slow speed corners, high speed corners and short straight, not long straights. There are only a few tracks that have straights longer then 3000 feet.
Longest straight I run is VIRs back straight at 4000 feet with a + 100 foot elevation change at the 3000 foot mark. The fastest is Road Atlanta's back straight.
Plus there is always traffic, faster cars and slower cars that are being lapped.
