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This has been posted a little while ago by Tuan....so I'm relighting the fire.

I know some of you stinkers have aftermarket intake manifolds layin' around.
We need to know the volume of these, down to the exact significant digit. Fill 'em up with water and tell us how much water it took to fill up the plenum. This way we can get an idea as to what is small IM volume and what is large IM volume!

This would be a tremendous leap for the site and Integra performance education.
 

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on that note, where can I find the plenum volumes and measurements ( diameters etc.) for the various stock manifolds?
 

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very good idea...you might as well calculate the runner port area and, using a string and a standard reference point on the outside of the runner, measure the runner lengths, as well. I can give you the GSR plenum and runner and port areas...

for our stock bore, stroke, and displacement in B18C's, the calculated minimum cfm is 277 cfm for 9000 rpm (262 cfm for an 8500 rpm redline, 246 cfm for an 8000 rpm redline) at 97% volumetric efficiency and the minimum port area is 1.654 sq in. (1.562 sq in. for 8500 rpm, 1.47 sq in. for 8000 rpm redline).


some helpful sites to get you rolling for calculators. notice the relationship to displacement and peak torque rpm...parts integration....no part works in isolation or is an island on to itself :

my 2 favourite reference calculator sites...

http://www.newcovenant.com/speedcrafter/calculators/runnerarea.htm


http://www.rbracing-rsr.com/runnertorquecalc.html


others that I cross-reference from time to time...

http://www.mtv411.com/auto/Stroke-Bore-Cylinders-Intake-Piston-Speed-HP-RPM.htm

http://www.rapidline.com/calc/engine/

http://www.slowgt.com/Calc2.htm

more to come....
 

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btw I don't rely on formulas per se but they do give you a ballpark to start with...remember Hondas tend to like smaller ports and we rarely exceed the size of the holes on the IM gasket anyway...that's a good guide as to the maximum port cross-sectional area you should go with. The cfm numbers again are only flow capacity...go too big and you gut the midrange power and lose flow quality.
 

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there are 2 bits of info I'd like to compile on this site to make us unique over the other Honda sites:

1. Cam Lobe Separation Angles for all the Teg aftermarket & stock cams and ABDC closing angles for the intake cam (for obvious reasons... well, maybe not so obvious to beginners...so read here if you don't know ).

2. IM plenum volumes, IM runner length and diameter for all of the aftermarket and stock IM's.

a useful project to assign and divvy up amongst members or mods perhaps? want to organize and assign people to call the manufacturers?
 
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