do these compression numbers for 9:1 sound right?
03-06-2004, 03:46 PM
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do these compression numbers for 9:1 sound right?
i just finished my break in period and completed a compression test. numbers are:
180 180 185 180
checked each one 3 times and numbers were the same each time. i did this becasue i noticed i am losing oil somwhere and i am hoping its because im running shitty 5w-30 oil and its just burning away...
how do these numbers sound?
180 180 185 180
checked each one 3 times and numbers were the same each time. i did this becasue i noticed i am losing oil somwhere and i am hoping its because im running shitty 5w-30 oil and its just burning away...
how do these numbers sound?
03-06-2004, 04:12 PM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
those are solid numbers, i have seen some 9:1 motors crankin near 200 but the numers are consistant so i wouldn't worry
03-06-2004, 04:18 PM
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Re: do these compression numbers for 9:1 sound right? (94gsr4dr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94gsr4dr »</TD></TR><TR><TD CLASS="quote">those are solid numbers, i have seen some 9:1 motors crankin near 200 but the numers are consistant so i wouldn't worry</TD></TR></TABLE>
really? man that really bothers me that my numbers are low compared to what it shouodl be? before i changed pistons and rods my compression was 210 accros teh board and i read up a lot and a lot of people were getting between 160 accorss the board to 180 accross the board. i thought since i had 180 all teh way across that was great. but if 200 is what its supposed to be at for 9:1 compression then i feel as if i didnt do something right even though they are consistant with each other it still bothers me
really? man that really bothers me that my numbers are low compared to what it shouodl be? before i changed pistons and rods my compression was 210 accros teh board and i read up a lot and a lot of people were getting between 160 accorss the board to 180 accross the board. i thought since i had 180 all teh way across that was great. but if 200 is what its supposed to be at for 9:1 compression then i feel as if i didnt do something right even though they are consistant with each other it still bothers me
03-06-2004, 04:34 PM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
180-185psi with 9:1 pistons and a b16 head sounds perfect!! Your fine.
03-06-2004, 04:35 PM
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Re: do these compression numbers for 9:1 sound right? (SOUNDEFFECTS)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOUNDEFFECTS »</TD></TR><TR><TD CLASS="quote">180-185psi with 9:1 pistons and a b16 head sounds perfect!! Your fine.</TD></TR></TABLE>
where did i say i had a b16 head?? this is a b18c1 block and a gsr gead p72.....
where did i say i had a b16 head?? this is a b18c1 block and a gsr gead p72.....
03-06-2004, 04:46 PM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
My b16a2 stock bore 8.8:1cr pistons pull 180-185psi across the board! With the stock pistons, I think compression was 10.2:1 was 235-240psi acorss the board!
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03-06-2004, 04:58 PM
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Re: do these compression numbers for 9:1 sound right? (TurboCX)
Nextelbuddy, some people compression test with 5 cranks. Other's crank the motor more and get higher results. You will always see people with different compression numbers on
H-T. Some people do the test right and others don't. 180-185 are good numbers for your setup.
H-T. Some people do the test right and others don't. 180-185 are good numbers for your setup.
03-06-2004, 05:55 PM
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Re: do these compression numbers for 9:1 sound right? (TurboCX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboCX »</TD></TR><TR><TD CLASS="quote">Nextelbuddy, some people compression test with 5 cranks. Other's crank the motor more and get higher results. You will always see people with different compression numbers on
H-T. Some people do the test right and others don't. 180-185 are good numbers for your setup. </TD></TR></TABLE>
really? thats good to know i did my compressio test with only 5 cranks per cylinder.... thats what i was told and thats howi did it.. i didnt want to crank any more becasue i thought that more than 5 cranks would give higher ( false) readings than what i really had and i wanted to know the truth lol. thanx man
H-T. Some people do the test right and others don't. 180-185 are good numbers for your setup. </TD></TR></TABLE>
really? thats good to know i did my compressio test with only 5 cranks per cylinder.... thats what i was told and thats howi did it.. i didnt want to crank any more becasue i thought that more than 5 cranks would give higher ( false) readings than what i really had and i wanted to know the truth lol. thanx man
03-06-2004, 06:01 PM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
the pressure wont increase if you crank it 10 times and 50 times, it will max out no matter what...
03-06-2004, 06:13 PM
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Re: do these compression numbers for 9:1 sound right? (Mase)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase »</TD></TR><TR><TD CLASS="quote">the pressure wont increase if you crank it 10 times and 50 times, it will max out no matter what...</TD></TR></TABLE>
That's correct. If you keep cranking it, it will eventually max out. However, you will see a difference in readings from 5 puffs(cranks) to 10 puffs. I've seen this plenty of times.
That's correct. If you keep cranking it, it will eventually max out. However, you will see a difference in readings from 5 puffs(cranks) to 10 puffs. I've seen this plenty of times.
03-06-2004, 07:04 PM
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Re: do these compression numbers for 9:1 sound right? (boosted_dc2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted_dc2 »</TD></TR><TR><TD CLASS="quote">what about his oil loss??? that would worry me more.....
Landon</TD></TR></TABLE>
im not too wqorried about it. its probably the shitty thin non synthetic 5w-30 oil im using right now. its not cuz of my rings apparent from my compression test. and its not my head gasket because my coolant is perfect no oil in it i know i been checking it for over a week now lol
Landon</TD></TR></TABLE>
im not too wqorried about it. its probably the shitty thin non synthetic 5w-30 oil im using right now. its not cuz of my rings apparent from my compression test. and its not my head gasket because my coolant is perfect no oil in it i know i been checking it for over a week now lol
03-06-2004, 08:48 PM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy »</TD></TR><TR><TD CLASS="quote">
its not cuz of my rings apparent from my compression test.</TD></TR></TABLE>
Did you do a leakdown?
its not cuz of my rings apparent from my compression test.</TD></TR></TABLE>
Did you do a leakdown?
03-06-2004, 09:43 PM
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Re: do these compression numbers for 9:1 sound right? (5thgencivic)
Compression #'s sound good. As for oil consumption, it could alot of things from your turbo return line to your valve seals.
03-06-2004, 09:59 PM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
i got 180 across at 9.1 as well. sounds good to me
when are you going to ed to tune?
im heading up there thursday in da morning
when are you going to ed to tune?
im heading up there thursday in da morning
03-07-2004, 11:08 PM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
i just finished my break in period too and my setup is this
b18a stock sleeves with endyn 9:1 piston and eagle rods with b16 head
compression test 175 all across the board
leakdown test 2-3% all across the board
b18a stock sleeves with endyn 9:1 piston and eagle rods with b16 head
compression test 175 all across the board
leakdown test 2-3% all across the board
03-08-2004, 12:19 AM
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Re: do these compression numbers for 9:1 sound right? (TurboCX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboCX »</TD></TR><TR><TD CLASS="quote">180-185 in a 9:1 compression GSR motor are right. Nothing to worry about. Those #'s are good. 
</TD></TR></TABLE>
what if it's a stock b16 engine with 9:1 or 9.5:1, what will be the usual #s? thanks.
</TD></TR></TABLE>what if it's a stock b16 engine with 9:1 or 9.5:1, what will be the usual #s? thanks.
03-08-2004, 03:16 AM
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Re: do these compression numbers for 9:1 sound right? (_Endless_)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -iLLuZioN-B18C1 »</TD></TR><TR><TD CLASS="quote">
when are you going to ed to tune?
</TD></TR></TABLE>
when are you going to ed to tune?
</TD></TR></TABLE>
03-08-2004, 05:06 AM
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Re: do these compression numbers for 9:1 sound right? (rocket256)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rocket256 »</TD></TR><TR><TD CLASS="quote">when are you going to ed to tune?
</TD></TR></TABLE>
as soon as my msd ignition ets here should be in 1 week if not then the next week. so 2 weeks at the most
</TD></TR></TABLE>
as soon as my msd ignition ets here should be in 1 week if not then the next week. so 2 weeks at the most
03-08-2004, 05:14 AM
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Re: do these compression numbers for 9:1 sound right? (9psiTurboSI)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 9psiTurboSI »</TD></TR><TR><TD CLASS="quote">My b16a2 stock bore 8.8:1cr pistons pull 180-185psi across the board! With the stock pistons, I think compression was 10.2:1 was 235-240psi acorss the board!</TD></TR></TABLE>
was that done on a cold, warm or hot motor?
was that done on a cold, warm or hot motor?
03-08-2004, 05:30 AM
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Re: do these compression numbers for 9:1 sound right? (Charlie Moua)
i dont know about him.... but i did mne on a warm motor.... is there a difference?
03-08-2004, 08:19 AM
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Re: do these compression numbers for 9:1 sound right? (nextelbuddy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nextelbuddy »</TD></TR><TR><TD CLASS="quote">i dont know about him.... but i did mne on a warm motor.... is there a difference?</TD></TR></TABLE>
cold motor should pull lower numbers
cold motor should pull lower numbers
03-08-2004, 08:53 AM
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Re: do these compression numbers for 9:1 sound right? (-iLLuZioN-B18C1)
um are you sure because when i did a compression on my stock b18c1 motor i got 210 all teh way across on warm motor and when i did it again on a cold motor i got 230 so i dont think thats right
03-08-2004, 11:28 AM
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Re: do these compression numbers for 9:1 sound right? (Mase)
i do 5 secs on each cyl , seems to get the hit the max on all of them , it seems about right though. no worries. mines like 9:1-9.3:1 somewhere in there and mine are 200 straight across. no variation at all or not enuff to see. id say yours is normal though