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Author Topic:   compression
the last dive
Gearhead

Posts: 147
From: sydney australia
Registered: Dec 2001

posted 07-26-2002 03:49 AM     Click Here to See the Profile for the last dive     Edit/Delete Message   Reply w/Quote
how does one calculate compression??

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speedy
Gearhead

Posts: 186
From: Parkersburg WV
Registered: Nov 99

posted 07-26-2002 04:32 AM     Click Here to See the Profile for speedy   Click Here to Email speedy     Edit/Delete Message   Reply w/Quote
There's several things you need to know before you can figure your compression ratio. What cc head you have, deck height, volume of one cylinder, head gasket thickness, and piston volume(dome piston, reliefs) You need to know all this before you can get an accurate comp. ratio.

Andy

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 07-26-2002 07:08 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
items needed to figure compression are:

bore, stroke, if you have valve reliefs in piston, chamber volume, head gasket thickness.

NHRA shows the formula for CR as follows:

chamber volume cc's + gasket cc's + deck clearance cc's + (displacement x 2.0483) ----------------------------------------------------------------------------------------
chamber volume cc's + gasket cc's + deck clearance cc's

(any of the numbers can be neagtive, such as deck clearance)

deck clearance = bore x bore x 12.87 x depth of deck clearance


volume of head gasket = bore x bore x 12.87 x thickness of head gasket

Larry

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Buster
Gearhead

Posts: 780
From: Orlando
Registered: May 2002

posted 07-26-2002 09:18 AM     Click Here to See the Profile for Buster   Click Here to Email Buster     Edit/Delete Message   Reply w/Quote
the last drive, I have a MSWorks spreed sheet setup for calculating compression ratios & CID's if you would like me to send it to you....

All you have to do is plug in the numbers you have and it does the rest.

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