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compression
- Thread starter tucky
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- compression
Chris H
master of boobies
depends on how good the starter is, the battery, if the plugs are in or out etc what cams it has.
The readings should be within 10% of each other.
My chamade was 170 ish last time I check but I have checked other ones and even as low at 110 PSI (standard cars, just slower at cranking).
The readings should be within 10% of each other.
My chamade was 170 ish last time I check but I have checked other ones and even as low at 110 PSI (standard cars, just slower at cranking).
Chris H
master of boobies
well today out of curiosity I checked mine.
Cyl 1 - 12.5 BAR - 181 PSI (tested last btw)
Cyl 2 - 12 BAR - 174 PSI
Cyl 3 - 12 BAR - 174 PSI
Cyl 4 - 11 BAR - 159 PSI
That was whilst hot and having been up to 125 on the tack on the way back to the pits, all plugs out throttle closed.
I have these readings from when it was laid up dated 5/6/09, this is all plugs out but stone cold throttle closed, stone cold as in months since last start
Cyl 1 - 12.5 BAR - 181 PSI
Cyl 2 - 13 BAR - 188 PSI
Cyl 3 - 11.5 BAR - 166 PSI
Cyl 4 - 12 BAR - 174 PSI
As you can see the readings vary a bit, also the car is now in every day use and used hard and its seen the limiter in 5th a few times since being pushed back into service.
yes the readings are not ideal as there is quite a bit of variance between 1 and 4 of 1.5 BAR but I'm not losing sleep over it. Also you'll notice the previous readings I took nearly 2 years ago show there was a difference of 1.5BAR between 2 and 3.
Its a good indicator but its not an exact science.
Cyl 1 - 12.5 BAR - 181 PSI (tested last btw)
Cyl 2 - 12 BAR - 174 PSI
Cyl 3 - 12 BAR - 174 PSI
Cyl 4 - 11 BAR - 159 PSI
That was whilst hot and having been up to 125 on the tack on the way back to the pits, all plugs out throttle closed.
I have these readings from when it was laid up dated 5/6/09, this is all plugs out but stone cold throttle closed, stone cold as in months since last start
Cyl 1 - 12.5 BAR - 181 PSI
Cyl 2 - 13 BAR - 188 PSI
Cyl 3 - 11.5 BAR - 166 PSI
Cyl 4 - 12 BAR - 174 PSI
As you can see the readings vary a bit, also the car is now in every day use and used hard and its seen the limiter in 5th a few times since being pushed back into service.
yes the readings are not ideal as there is quite a bit of variance between 1 and 4 of 1.5 BAR but I'm not losing sleep over it. Also you'll notice the previous readings I took nearly 2 years ago show there was a difference of 1.5BAR between 2 and 3.
Its a good indicator but its not an exact science.
bidderman1969
detailer
What do you reckons happening on 4?
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