That's what I figured.
Looks like PipeMax doesn't actually give a plenum volume.
(it would be for a N/A application also)
It gives the usual min as the single cylinder size to the max of the total engine CID.
A calculator I have says for your engine it would be around 156 cubic inches.
But a lot of 4 cylinder racers have been using up to 2 times the CID of the engine to get the HP out.
(446 in your case?)
Plenum volume is not really understood as well as it could be.
Also the carb/Throttle Body needs to be bigger than a V8 type size.
(for the same reasons basically as the plenum)
PipeMax runner data (in inches):
- Induction System Tuned Lengths - ( Cylinder Head Port + Manifold Runner )
1st Harmonic= 33.676 (usually this Length is never used)
2nd Harmonic= 19.114 (some Sprint Engines and Factory OEM's w/Injectors)
3rd Harmonic= 13.344 (ProStock or Comp SheetMetal Intake • best overall HP )
4th Harmonic= 10.503 (Single-plane Intakes , less Peak Torque • good HP )
5th Harmonic= 8.521 (Torque is reduced, even though Tuned Length)
__________________
John Wallace - johnta1
Pontiac Power RULES !!!
www.wallaceracing.com
Winner of Top Class at Pontiac Nationals, 2004 Cordova
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KRE's MR-1 - 1st 5 second Pontiac block ever!
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