What is the healthiest compression for the 8?
02-21-2009 | 07:13 PM
#1
Thread Starter
laulongfei
Joined: Nov 2006
Posts: 194
Likes: 0
From: San Francisco,CA
What is the healthiest compression for the 8?
Just wondering if I was going to do a compression check, what is the healthy #? 190psi? 200psi?
that way i know when i do need a engine rebuild. thanks
that way i know when i do need a engine rebuild. thanks
02-22-2009 | 09:55 PM
#6
Original Turbo 'd Auto !!
Joined: Mar 2004
Posts: 2,133
Likes: 4
From: Surprise, Arizona
try again. chamber pressure not compression ratio. 
When I did mine in Oct it was 127 - 129 front and rear was about the same. It could have been higher, I don't exactly remember. this was on a warm motor that sat for 45 min after a drive. also AP increased injected oil.
and 7.2 kpa or 100 psi = borderline anything below this # = rebuild
When I did mine in Oct it was 127 - 129 front and rear was about the same. It could have been higher, I don't exactly remember. this was on a warm motor that sat for 45 min after a drive. also AP increased injected oil.
and 7.2 kpa or 100 psi = borderline anything below this # = rebuild
02-22-2009 | 10:24 PM
#7
3-wheeler
Joined: Dec 2005
Posts: 2,734
Likes: 0
From: Phoenix
try again. chamber pressure not compression ratio.
When I did mine in Oct it was 127 - 129 front and rear was about the same. It could have been higher, I don't exactly remember. this was on a warm motor that sat for 45 min after a drive. also AP increased injected oil.
and 7.2 kpa or 100 psi = borderline anything below this # = rebuild
When I did mine in Oct it was 127 - 129 front and rear was about the same. It could have been higher, I don't exactly remember. this was on a warm motor that sat for 45 min after a drive. also AP increased injected oil.
and 7.2 kpa or 100 psi = borderline anything below this # = rebuild
02-22-2009 | 10:34 PM
#8
Page 01-10-7 Workshop Manual
Standard 830 kPa (120 PSI) @ 250 RPM
Minimum 680 kPa (98.6 PSI) @ 250 RPM
Standard Difference in Chambers Within 150 kPa (28 PSI)
Standard Difference in Rotors Within 100 kPa (14.5 PSI)
Standard 830 kPa (120 PSI) @ 250 RPM
Minimum 680 kPa (98.6 PSI) @ 250 RPM
Standard Difference in Chambers Within 150 kPa (28 PSI)
Standard Difference in Rotors Within 100 kPa (14.5 PSI)
02-22-2009 | 10:42 PM
#9
Thread Starter
laulongfei
Joined: Nov 2006
Posts: 194
Likes: 0
From: San Francisco,CA
09Factor thanks for another useful infro! Do you think I should check my compression before turboing my car right?
Which aftermarket makes good rotary blade?
Which aftermarket makes good rotary blade?
Last edited by laulongfei; 02-22-2009 at 10:54 PM.
02-23-2009 | 02:01 PM
#10
Original Turbo 'd Auto !!
Joined: Mar 2004
Posts: 2,133
Likes: 4
From: Surprise, Arizona
You will atleast know what you started out with compressions wise.
As for good Apex seals (thats what I'm thining u meant) Dr. Ianetti has some really killer ceramic ones. Widely used in the raceing circut. There is another manufacture that makes semi-flexible ones. Don't remember the name. Someone here did post some info on them.
As for good Apex seals (thats what I'm thining u meant) Dr. Ianetti has some really killer ceramic ones. Widely used in the raceing circut. There is another manufacture that makes semi-flexible ones. Don't remember the name. Someone here did post some info on them.
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