Intake Manifold Runner lenght Calculations sheet
https://ls1tech.com/forums/advanced-engineering-tech/560443-how-would-you-design-intake-manifold-et-245s.html
Checkout J-Rod's post in this thread.
Checkout J-Rod's post in this thread.
TECH Enthusiast
Joined: Nov 2002
Posts: 550
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From: Michigan, auburn HIlls
Runner length is very subjective. It depends on what the intent of the car is. Is it for drag racing, street, road racing?
I have dynographs for all kinds of differant runner lengths. By changing the length a few inches on our individual runner manifolds we see about 50 hp and 40 torque differance on a 600hp engine.
You can flatten out the curve by stagering runner length on every other firing order.
A simple formula can not acuratly determine runner length, it will only get you into ballpark. There is far more to it.
Kinsler
kinsler.com
I have dynographs for all kinds of differant runner lengths. By changing the length a few inches on our individual runner manifolds we see about 50 hp and 40 torque differance on a 600hp engine.
You can flatten out the curve by stagering runner length on every other firing order.
A simple formula can not acuratly determine runner length, it will only get you into ballpark. There is far more to it.
Kinsler
kinsler.com
TECH Enthusiast
Joined: Sep 2004
Posts: 564
Likes: 0
From: Omaha, NE
Originally Posted by 11sHSV
I was wondering if anyone may have a Calculation/spreadsheet for working out runner lengths.
Maybe j-ROD can help with this.
Joe
Maybe j-ROD can help with this.
Joe
I have an old cam program from Wolverine Cams that has a utility in the program for calculating intake lengths, exhaust runner length/diameter and a lot more. Don't know how accurate it is but sure is interesting, they may still have that program available. One interesting thing I just remembered, they perform their tuned length calculations from the pistons BDC.
Last edited by dynocar; Feb 24, 2007 at 10:30 AM.
