IT_SS

iTrader: (5)

Hiya guys,

I was doing some research compression calculations and came across a rather informative site : http://www.angelfire.com/fl/procrastination/motor.html.

You basically enter your Bore, Stroke, how many cylinders (I'd imagine you all have 8 lol), Combustion Chamber volume, Piston dome (or dish) and gasket thickness. Then hit the 'Compute' button. It seem pretty accurate, but I have yet to compare it to the actual formula for figuring CR's.

My input .::.
Piston size in inches :: 3.900" (stock)
Stroke in inches :: 3.620" (stock)
Number of cylinders :: No brain(er)
Combustion Chamber in cc :: 72 cc
Piston dome in cc's :: -2.2
(Dome = positive,
Flat = 0, dished = negative number)
Gasket Thickness in inches :: 0.052''

Output .::.
Displacement :: 346"^3 (wow, didn't see that one coming) or 5.67 LI
Compression Ratio :: 9.3.....

so it seems like a pretty useful tool....

Jimmy P

iTrader: (177)

Prety cool tool. Now if I could only remember what size dish is on my Diamond pistons.

ls1290

iTrader: (20)

I have been using that one for years now. It is a very good one.

405HP_Z06

iTrader: (11)

It calculates incorrectly; It's only accurate within +/- .2 points. Close enough for WAG calculations considering it's free.

ls1290

iTrader: (20)

Aaron,

If you use the same input values as your application, it is off 0.08 in compression. Much better than a WAG. If you consider the web app does not take into account gasket diameter and others, it is pretty darn close.