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Old 04-13-2005, 06:25 PM   #1
CBRDSpeedfactory
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ALL lots of fast 1s
mostly silver!

Default what is good cylinder compression on the sti?

doing a test now, leakdown is fine...compression seems low, but we dont know what it should be

chad b
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Old 04-13-2005, 06:43 PM   #2
Visceral
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Old 04-13-2005, 07:00 PM   #3
kool168
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let me copy and paste it here...

Compression (350 rpm and fully open throttle):
Standard
981 1,177 kPa (10 12 kgf/cm2, 142
171 psi)
Limit
882 kPa (9.0 kgf/cm2, 128 psi)
Difference between cylinders
Less than 49 kPa (0.5 kgf/cm2, 7 psi)
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Old 04-13-2005, 09:26 PM   #4
WRXout
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Quote:
Originally Posted by CBRD
doing a test now, leakdown is fine...compression seems low, but we dont know what it should be

chad b
05 sti is already down?
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Old 04-13-2005, 10:01 PM   #5
CBRDSpeedfactory
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its a test, i am installing forged pistons... i want to test before after...

cb
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Old 04-13-2005, 10:39 PM   #6
happasaiyan
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the 120 range seems most common
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Old 04-13-2005, 10:47 PM   #7
dwx
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Really depends if you are doing it cold or not. If all the cylinders are relatively the same you are fine. If you have a bad piston it'll usually be at least 50psi lower than the rest. Mine tested out at like 145, 140, 142, 60.
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Old 04-13-2005, 11:05 PM   #8
CBRDSpeedfactory
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mine were all in the mid 120's...

just want to have a baseline..

thanks guys

cb
chadblock.com
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Old 04-14-2005, 07:43 PM   #9
bboy
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I've only seen 145-150 psi with one gauge. It this guage "accurate", no way to know. Is it "relatively accurate", yes it seems precise. Relative to one another, good cylinders are within 5 psi of each other.

Are you still working with the SBR turbo?
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Old 04-14-2005, 07:50 PM   #10
CBRDSpeedfactory
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switching to our own rotated setup, the beginning of may...

i found really that its sooo much easier to work on..

u figure u spend 2-300 for the inlet pipe... 200-250 on a big MAF conversion.... downpipe. 200-300..... and 1300-2000 for a turbo...

youve spent about 2100-2800 bucks...

we are going to supply a rotated option just above that...

ballbearing ceramic, with 4" inlet..

cb
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