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Re: Cranking Compression?
[Re: MR_P_BODY]
#641613
03/16/10 07:29 PM
03/16/10 07:29 PM
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Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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I don't understand any of this stuff you all are WORRYING about. If the engine was put together and you KNOW what the static compression is/was/should be,,,you are not going to change that figure with all these 'calculations'. A leak-down test will show you if there is a problem in the valves/rings/headgaskets etc. Why worry and ask questions about your engine? If the leakage is high,,you have a problem in that cylinder.....simple enough I think.
If you like drag racing, support your local track.
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Re: Cranking Compression?
[Re: CHAPPER]
#641615
03/16/10 08:12 PM
03/16/10 08:12 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I don't understand any of this stuff you all are WORRYING about. If the engine was put together and you KNOW what the static compression is/was/should be,,,you are not going to change that figure with all these 'calculations'. A leak-down test will show you if there is a problem in the valves/rings/headgaskets etc. Why worry and ask questions about your engine? If the leakage is high,,you have a problem in that cylinder.....simple enough I think.
Pretty simple really.... I was going to do a compression
test and wanted to know what it should be... thats
all, I wanted to do the compression test before I
pulled the rockers to do the leak down
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Re: Cranking Compression?
[Re: emarine01]
#641617
03/16/10 08:52 PM
03/16/10 08:52 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I think once you have your intake closing point close for the calc it should fall with in 10 psi of your gauge reading, the calcs are a little confusing on the duration methods 
It came real close once I added the 40* (which I didnt
read before)... I guess you need to read the directions...LOL
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Re: Cranking Compression?
[Re: mopar dave]
#641620
03/17/10 01:38 AM
03/17/10 01:38 AM
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Joined: Oct 2007
Posts: 4,209
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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whats the volume to pressure index representing or what does it mean?
That's so kewl!
They "borrowed" it from my (copyright-protected) site.
It's the DCR times the actual trapped cylinder volume times a .6% correction factor to approximate low speed torque for converter stall purposes,etc.
Boffin Emeritus
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