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Old 03-02-2004, 05:37   #1 (permalink)
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Compression Ratio

what is the formula for figuring this out? thanks in advance.
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Old 03-02-2004, 06:09   #2 (permalink)
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Re: Compression Ratio

Compression Ratio = (Cylinder volume + chamber Volume)/(chamber volume)

Cylinder Volume = (pi/4) x bore squared x stroke.


or

Compression Ratio = (PV+DCV+HGV+CCV)/(DCV+HGV+CCV)

where PV=Piston Swept Volume
DCV = Deck Clearance Volume
HGV = Head Gasket Volme
CCV = Combustion Chamber Volume
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Old 03-02-2004, 06:17   #3 (permalink)
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Re: Compression Ratio

i am assuming that piston swept volume is the dish in the piston? and is deck clearence measured when the piston is at TDC for the first half of the equation and and at BDC for the second half? or am i totally wrong.
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Old 03-02-2004, 06:25   #4 (permalink)
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Re: Compression Ratio

Also see http://www.smokemup.com/auto_math/index.php and http://www.bgsoflex.com/auto.html and
http://www.thedirtforum.com/toolbox.htm

all these here http://www.martindalecenter.com/Calc...tml#AUTO-HORSE
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Old 03-02-2004, 06:29   #5 (permalink)
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Re: Compression Ratio

a) Yes as swept volume is...
"that part of the cylinder capacity that is swept by the pistons on their up and down strokes (i.e., the volume through which a piston moves in one stroke) formed by the bore diameter and the piston stroke. Also called "displacement volume." See displacement. from http://www.100megsfree4.com/dictionary/index.htm
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Old 03-02-2004, 06:45   #6 (permalink)
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Re: Compression Ratio

thanks for the info and the links AussieBlue, will get all my figures now and punch them in to see my compression ratio.
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