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Old 11-02-2002, 01:19 AM
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Post compression, how is it determined?

Um, the topic pretty much states my question... how does a person determine what compression ratio any particular engine has? Is there a nice simple way to figure it out or is it some complicated process? Just curious =)

Thanks,
Ryan

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Old 11-02-2002, 02:49 PM
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um there are simple ways where you can take the combustion chambers and flat pistons that most people will know from factory rating.

There is also a really complicated formula to figure out EXACTLY what your cr is. So here it is:
First, firgure out this:
-Volume above top ring (Vt)
-Valve notches volume (Vn)
-Piston to deck volume (Vp)
-Gasket Volume (Vg)
-Combustion chamber volume (Vh)
-Dome Volume (Vd)
Then you add them all together except for Vd. You are going to subtract Vd from the rest of it and this will tell you the total volume of clearance. (Vcl)
Then you need to figure out your cylinder volume. (V)
Once you know all of this the equation gets simple:
(V)+(Vcl)/(Vcl)= compression ratio

If you need to know how to get each of these volumes I know how to do it if you are interested. HAVE FUN!
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Old 11-04-2002, 02:24 PM
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Try this link Some Calculators
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Old 11-04-2002, 05:47 PM
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Try www.kb-silvolite.com they have an easy compression calculator.
You need to know your:
1)Piston volume in cc
2)Deck height in inches (EX. .025)
3)Gasket thickness in inches (Ex. .018)
4)Head volume in cc
5)Bore size in inches
6)Stroke length in inches
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