Click to go to Forum Home Click to go to maXbimmer Home

Go Back   maXbimmer Forums > maXimum Tech > 3 Series > E36 (1991 - 1999)
User Name
Password


Welcome to Maxbimmer.com!

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-12-2004, 03:36 AM   #1
calgaryE30M50
2nd Gear Member
 
Join Date: Jan 2003
Location: Calgary ,Alberta
Posts: 72
compresion and Vac

I have a e30 with a 93 325is m50 motor swap ( car that motor came out of had only 96,000 kms ) and am just doing some research. When i put the motor in two years ago i did a compression test and found this:

1 = 185 psi
2 = 185 psi
3 = 190 psi
4 = 190 psi
5 = 180 psi
6 = 185 psi

now.. what should the psi be for a motor in good shape. The Bentley does not say it just says more then 145 psi and no more then 7 psi between cylinders (sp).

Also i have changed out the cams for 95 m3 cams and have a bored out throttle body. I also installed headers and a custom exhaust. I want to do another compression test to see how the motor is doing. Will these above mentioned things affect my compression +/- . I have only put about 10,000 kms on the motor since install but theses have been hard kms with dyno runs and track days and many 1/4 mile runs. And lots of spirited driving.

I would also like to do a vacuum test on the motor to make sure that i donít have any vacuum leaks. What should i be reading for vacuum off the intake at idle . Any help on this would be great guys.
calgaryE30M50 is offline   Reply With Quote
Old 02-12-2004, 04:32 AM   #2
Slowered318
tick.tick.tick.tick.tick
 
Slowered318's Avatar
 
Join Date: Jan 2002
Location: Toronto
Posts: 6,000
i had just over 200 psi in each cylinder after my rebuild.. so maybe that gives you and idea. my my compression is 10.5-1 by the book
__________________
The major difference between my 318is and an e30 M3 is that the noises come from the engine and not the passengers
Slowered318 is online now   Reply With Quote
Old 02-13-2004, 05:21 AM   #3
calgaryE30M50
2nd Gear Member
 
Join Date: Jan 2003
Location: Calgary ,Alberta
Posts: 72
bump... come on guys... lets hear your thoughts
__________________
1986 325es
93 M50 motor swap
95 M3 cams
RMS stage 1 (v1) supercharger setup for sale
3000 CDN without software
( unless you want RMS chip )
calgaryE30M50 is offline   Reply With Quote
Old 02-13-2004, 11:15 PM   #4
calgaryE30M50
2nd Gear Member
 
Join Date: Jan 2003
Location: Calgary ,Alberta
Posts: 72
What about Vacume.... what should it be at idle ?
__________________
1986 325es
93 M50 motor swap
95 M3 cams
RMS stage 1 (v1) supercharger setup for sale
3000 CDN without software
( unless you want RMS chip )
calgaryE30M50 is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 10:35 PM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.