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

Go Back   maXbimmer Forums > maXimum Tech > 3 Series > E30 (1983 - 1991)
User Name

Welcome to!

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!

Thread Tools Rate Thread Display Modes
Old 02-12-2004, 04:37 AM   #1
2nd Gear Member
Join Date: Jan 2003
Location: Calgary ,Alberta
Posts: 72
compression 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 don’t 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

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 07:01 PM.

Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Maxbimmer Copyright 2001 - 2018