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
Prev Previous Post   Next Post Next
Old 04-17-2012, 02:15 PM   #1
The Twin
3rd Gear Member
The Twin's Avatar
Join Date: Feb 2011
Location: ontario
Posts: 578
M20b25 compression test result prior to boost install

cross-posted from the F/I sections...figured get more exposure here.
if Mods feel it's clutter, please nuke the appropriate one.

My 1990 325ic will be undergoing some updgrades shortly.

in preperation for it to accomodate the boost setup that will be installed, I went ahead and performed another compression test...with results that kind of surprised me.

Please note, I overheated my engine last summer during the heatwave while stuck on Decaré in MTL...I suspect HG damage, which will be replaced prior to boost.

regardless, I wanted to get a feel for the health of the block.


145, 150, 120, 125, 150, 150


WARM ENGINE RESULTS...WITH oil added to cylinder, AND open throttle.

160, 180, 180, 180, 200, 180


I'm being told a few things, such as "complete rebuild" to a new ring job+hone+HG.

Would it be wiser to scrap this engine, and just get a new(used) one or even with the "better" results of a warm compression test, still reveals it has issues?

I'll be running 8psi with a .60AR turbo...

The Twin 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 12:02 PM.

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