my d16y8 compression test results
05-01-2007, 11:38 AM
#1
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my d16y8 compression test results
ok done my compression test today at school...trying to see my numbers before i turbo...from cyl. 1-4, i got 163, 163, 158, 163, doing 5 cranks...is this normal or good for a d16y8?? i kno the numbers should be all close together...but is it better to have higher compression numbers like 193, 193, 188, 193?? cause one of my classmates confused me where he said i would wanna have lower numbers and i thought the higher the compression numbers the better
05-01-2007, 11:46 AM
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Re: my d16y8 compression test results (cilvia)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cilvia »</TD></TR><TR><TD CLASS="quote">ok done my compression test today at school...trying to see my numbers before i turbo...from cyl. 1-4, i got 163, 163, 158, 163, doing 5 cranks...is this normal or good for a d16y8?? i kno the numbers should be all close together...but is it better to have higher compression numbers like 193, 193, 188, 193?? cause one of my classmates confused me where he said i would wanna have lower numbers and i thought the higher the compression numbers the better</TD></TR></TABLE>
Yes it is the higher compression the better, as for your numbers they seem kinda low
Yes it is the higher compression the better, as for your numbers they seem kinda low
05-01-2007, 12:53 PM
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Re: (97Ej6mike)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97Ej6mike »</TD></TR><TR><TD CLASS="quote">Higher compression is good for all motor builds
Lower compression is better for mid to high end boost applications/ builds.</TD></TR></TABLE>
right, only issue with your analogy is that you are comparing compression ratio as static means, which is fine. OP used is trying to determin the mechanical condition of an engine, by preforming a test. we know y8 has a compression ratio 9.6:1 which does not change from stock motor to motor. so irregardless of what he or his buddy has, both are just as good for turbocharging.
now as far as OPs, numbers will depend on the gauge and many other factors. Basically honda states about 175-180psi as being optimal and 128psi as minimal, with no more then 28psi between cylinders as acceptable.
Lower compression is better for mid to high end boost applications/ builds.</TD></TR></TABLE>
right, only issue with your analogy is that you are comparing compression ratio as static means, which is fine. OP used is trying to determin the mechanical condition of an engine, by preforming a test. we know y8 has a compression ratio 9.6:1 which does not change from stock motor to motor. so irregardless of what he or his buddy has, both are just as good for turbocharging.
now as far as OPs, numbers will depend on the gauge and many other factors. Basically honda states about 175-180psi as being optimal and 128psi as minimal, with no more then 28psi between cylinders as acceptable.
05-01-2007, 01:09 PM
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Re: (eg6ajk)
Those numbers are fine, the only thing you should be really worried about is variance between the numbers. IMO if any of the numbers vary more than 15% from the others then you might have a problem.
The numbers can change depending on if the car was hot, cold, and other factors.
The numbers can change depending on if the car was hot, cold, and other factors.
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05-01-2007, 05:01 PM
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Re: my d16y8 compression test results (cilvia)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cilvia »</TD></TR><TR><TD CLASS="quote">ok done my compression test today at school...trying to see my numbers before i turbo...from cyl. 1-4, i got 163, 163, 158, 163, doing 5 cranks...is this normal or good for a d16y8?? i kno the numbers should be all close together...but is it better to have higher compression numbers like 193, 193, 188, 193?? cause one of my classmates confused me where he said i would wanna have lower numbers and i thought the higher the compression numbers the better</TD></TR></TABLE>
Did you hold the throttle open?
Did you hold the throttle open?
05-01-2007, 05:27 PM
#10
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Re: my d16y8 compression test results (excivicboy96)
Like said already its always different between gauges, the final number isnt what you should be looking at. You look for how high the motor jumps on the first rotation, then the 2nd and 3rd. If it all jumps the same with a good hard jump then its good. Your numbers look perfectly fine to me.
05-01-2007, 08:58 PM
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Re: my d16y8 compression test results (excivicboy96)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by excivicboy96 »</TD></TR><TR><TD CLASS="quote">
Did you hold the throttle open?</TD></TR></TABLE>
no i havent...now that i think of it, was i really supposed to?? cause i remember my teacher saying is yur throttle wide open?? but i was too busy talkin to my other classmates while reading it...what difference would it make?? what numbers would i have got if i did WOT??
Did you hold the throttle open?</TD></TR></TABLE>
no i havent...now that i think of it, was i really supposed to?? cause i remember my teacher saying is yur throttle wide open?? but i was too busy talkin to my other classmates while reading it...what difference would it make?? what numbers would i have got if i did WOT??
05-02-2007, 12:05 PM
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Re: my d16y8 compression test results (excivicboy96)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by excivicboy96 »</TD></TR><TR><TD CLASS="quote"> try it out. I get higher numbers when I opened it up. Not much for the pistons to compress if they can't get air. </TD></TR></TABLE>
by like how much?? just to give me the idea since i dont think ima be able to do it again
by like how much?? just to give me the idea since i dont think ima be able to do it again
12-29-2023, 05:56 PM
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Re: (eg6ajk)
Like said already its always different between gauges, the final number isnt what you should be looking at. You look for how high the motor jumps on the first rotation, then the 2nd and 3rd. If it all jumps the same with a good hard jump then its good. Your numbers look perfectly fine to me.
Those numbers are fine, the only thing you should be really worried about is variance between the numbers. IMO if any of the numbers vary more than 15% from the others then you might have a problem.
The numbers can change depending on if the car was hot, cold, and other factors.
The numbers can change depending on if the car was hot, cold, and other factors.
So what if I have 120 130 100 120 across
12-29-2023, 08:15 PM
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12-30-2023, 08:35 AM
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12-31-2023, 08:00 PM
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Re: (eg6ajk)
You have likely done something incorrectly in the build... you will have to tear back down and check everything over to find your error.
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