What is the healthiest compression for the 8?
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
Original Turbo 'd Auto !!
Joined: Mar 2004
Posts: 2,136
Likes: 5
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
3-wheeler
Joined: Dec 2005
Posts: 2,734
Likes: 1
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
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)
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; Feb 22, 2009 at 09:54 PM.
Original Turbo 'd Auto !!
Joined: Mar 2004
Posts: 2,136
Likes: 5
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.
Registered
iTrader: (4)
Joined: Aug 2004
Posts: 12,255
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From: Buddhist Monastery, High Himalaya Mtns. of Tibet
There isn't one. Unless you want to pay several thousand dollars for "Dr. Ianetti has some really killer ceramic ones". The factory ones should suffice.
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