Compression question
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From: Edmonton, AB
Compression question
Hey i just did a compression test on my motor, and got 150-150-150-150... The numbers are dead consistent.
Is this alright? The car has about 30 000 miles on it and heard that you gain compression after time becuase of carbon buildup?
Is this alright? The car has about 30 000 miles on it and heard that you gain compression after time becuase of carbon buildup?
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Re: Compression question (0097ITR)
On one hand they seem low, but on the other they are consistent and the low numbers were probably just because you could have used a few more "cranks" to up the numbers (and/or the throttle wasn't held open).
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From: Charlotte, NC
Re: Compression question (zygspeed)
As long as they are consistant, it should be ok. Some gauges don't read right, but 150 all across is nice.
P.S., I'll have a compression test treat for everyone in the next few days...
P.S., I'll have a compression test treat for everyone in the next few days...
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From: Edmonton, AB
Re: Compression question (drdisco69)
Ok i redid it again.
I let the engine warm up a bit longer, WOT, took off the intake, and i got 165 across the board. Maybe the piston rings arent fully seated yet. It burns no oil and runs great and fast, just wondering.
I am also using a "GRIP (grand rapids industrial products)" compression tester, maybe its too shitty to get a good reading.
I let the engine warm up a bit longer, WOT, took off the intake, and i got 165 across the board. Maybe the piston rings arent fully seated yet. It burns no oil and runs great and fast, just wondering.
I am also using a "GRIP (grand rapids industrial products)" compression tester, maybe its too shitty to get a good reading.
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From: Edmonton, AB
Re: Compression question (El Pollo Diablo)
enough, about 10 seconds according to helms..
The engine has one compression stroke every 4 cranks, so 8 cranks would be sufficient.(two compression strokes)
The engine has one compression stroke every 4 cranks, so 8 cranks would be sufficient.(two compression strokes)
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From: USA
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From: Canada
Re: Compression question (0097ITR)
Good info here i think, got this from user "Nameless RB26" 
There isn't a 'there'. If numbers are consistent, then that's all that matters.
All low consistent numbers = bad gauge, good engine.
All high consistend numbers = good gauge, good engine.
All low inconsistent numbers = bad.
All high inconsistent numbers = bad.
That's the *general* rule I use when doing comp tests.
When it comes to actually DIAGNOSIS after a compression test.. you do a cylinder leak down.
Compression tests are not always acurate. They do not tell you what is wrong with your engine. They do nothing but give you a general *IDEA* of good/bad or ok.
When you do a compression test the engine MUST be at operating temp. Not warm. Not cold. You do it immediately following shutoff.
Throttle open.
All plugs removed.
6 or 8 cranks on each cylinder. Not 6 here, 8 there. The same on each cylinder.
Dry compression tests are worthless and usually innacurate.
I hope this info reaches people in searches.. because this topic has high frequency here.
There isn't a 'there'. If numbers are consistent, then that's all that matters.
All low consistent numbers = bad gauge, good engine.
All high consistend numbers = good gauge, good engine.
All low inconsistent numbers = bad.
All high inconsistent numbers = bad.
That's the *general* rule I use when doing comp tests.
When it comes to actually DIAGNOSIS after a compression test.. you do a cylinder leak down.
Compression tests are not always acurate. They do not tell you what is wrong with your engine. They do nothing but give you a general *IDEA* of good/bad or ok.
When you do a compression test the engine MUST be at operating temp. Not warm. Not cold. You do it immediately following shutoff.
Throttle open.
All plugs removed.
6 or 8 cranks on each cylinder. Not 6 here, 8 there. The same on each cylinder.
Dry compression tests are worthless and usually innacurate.
I hope this info reaches people in searches.. because this topic has high frequency here.
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Joined: Oct 2003
Posts: 11,340
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From: Homie dont, play that, USA
Re: Compression question (jBj)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jBj »</TD></TR><TR><TD CLASS="quote">Good info here i think, got this from user "Nameless RB26"
There isn't a 'there'. If numbers are consistent, then that's all that matters.
All low consistent numbers = bad gauge, good engine.
All high consistend numbers = good gauge, good engine.
All low inconsistent numbers = bad.
All high inconsistent numbers = bad.
That's the *general* rule I use when doing comp tests.
When it comes to actually DIAGNOSIS after a compression test.. you do a cylinder leak down.
Compression tests are not always acurate. They do not tell you what is wrong with your engine. They do nothing but give you a general *IDEA* of good/bad or ok.
When you do a compression test the engine MUST be at operating temp. Not warm. Not cold. You do it immediately following shutoff.
Throttle open.
All plugs removed.
6 or 8 cranks on each cylinder. Not 6 here, 8 there. The same on each cylinder.
Dry compression tests are worthless and usually innacurate.
I hope this info reaches people in searches.. because this topic has high frequency here.
</TD></TR></TABLE>
Nice lil write up....
There isn't a 'there'. If numbers are consistent, then that's all that matters.
All low consistent numbers = bad gauge, good engine.
All high consistend numbers = good gauge, good engine.
All low inconsistent numbers = bad.
All high inconsistent numbers = bad.
That's the *general* rule I use when doing comp tests.
When it comes to actually DIAGNOSIS after a compression test.. you do a cylinder leak down.
Compression tests are not always acurate. They do not tell you what is wrong with your engine. They do nothing but give you a general *IDEA* of good/bad or ok.
When you do a compression test the engine MUST be at operating temp. Not warm. Not cold. You do it immediately following shutoff.
Throttle open.
All plugs removed.
6 or 8 cranks on each cylinder. Not 6 here, 8 there. The same on each cylinder.
Dry compression tests are worthless and usually innacurate.
I hope this info reaches people in searches.. because this topic has high frequency here.
</TD></TR></TABLE>
Nice lil write up....
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Joined: Jan 2004
Posts: 3,914
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From: Charlotte, NC
Re: Compression question (Blazeone)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Blazeone »</TD></TR><TR><TD CLASS="quote">consistent 190's. </TD></TR></TABLE>
What motor is this? Cams, compression, etc?
What motor is this? Cams, compression, etc?
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Joined: Jun 2004
Posts: 4,558
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From: Somewhere in MD, MD, USA
Re: Compression question (Blazeone)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Blazeone »</TD></TR><TR><TD CLASS="quote">Note, DO NOT use a shitty compressin tester. We redid the test with a good tester and got consistent 190's. </TD></TR></TABLE>
thats more like it.
thats more like it.
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