The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Re: Compression test figures (archive)
[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Posted by Neil Deshpande on October 17, 2001 at 18:45:24:

In Reply to: Compression test figures posted by ian m635 uk on October 17, 2001 at 01:47:05:

Ian:

Compression for the M5 will be higher than the 535i on account of the higher compression ratio. In addition uniformity is important within 10%. Engine should be warm (not hot/cold) and the same number of cranks for each cylinder tested. A good rule of thumb would be 14.7xC.R. psi I think. Wet compression should be the same or just a bit higher if the dry is consistent, but I have never done one of those.

Neil Deshpande
http://www.neilwerke.com

***


What should I expect from a dry and wet compression test on an M635. Car has 154k miles on it?

Bentley states 160 psi for the 12 valve 3.5l motor. Is the M engine different to this.?

Thanks

Ian




Follow Ups:


[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2008 Jump Internet Inc. All rights reserved.