Compression Test Results?!
Thread Starter
Joined: May 2004
Posts: 1,718
Likes: 10
From: Rosemount, MN
Compression Test Results?!
Ok,
Car is a 91 Turbo (TII) with 97k on the ODO. I've had the car only a couple months.
I bought this car from a guy who know very little history about it as he only owned it for a year and badly needed the money.
I ran a compression test on it with the mazda tester (paper graph).
I warmed up the car completely. Though not by driving it because the interior is completly torn apart. Then I removed the top spark plugs (trailing).
I disconnected the crank angle sensor, problem was it took about a half hour to do this without destroying the contector. Plus the time to pull the plugs and get the tester threaded in. (TII engines are realy packed in there!)
Thus the car had cooled off quite a bit I would assume.
For thoes who have tested compression on alot of rotaries how does an engine that has cooled off some affect the results of a compression test?
The reason I ask is because I got SOLID numbers for a turbo car with 97k miles on it.
All faces were consistant between 7.8 & 8.0 kg/cm2 on the mazda tester.
So either the engine has been rebuilt/replaced with a reman one. OR, somehow the results were affected by either a tester that is not calibrated anymore or the temp of the engine?!?!?!
Thoughts?
Car is a 91 Turbo (TII) with 97k on the ODO. I've had the car only a couple months.
I bought this car from a guy who know very little history about it as he only owned it for a year and badly needed the money.
I ran a compression test on it with the mazda tester (paper graph).
I warmed up the car completely. Though not by driving it because the interior is completly torn apart. Then I removed the top spark plugs (trailing).
I disconnected the crank angle sensor, problem was it took about a half hour to do this without destroying the contector. Plus the time to pull the plugs and get the tester threaded in. (TII engines are realy packed in there!)
Thus the car had cooled off quite a bit I would assume.
For thoes who have tested compression on alot of rotaries how does an engine that has cooled off some affect the results of a compression test?
The reason I ask is because I got SOLID numbers for a turbo car with 97k miles on it.
All faces were consistant between 7.8 & 8.0 kg/cm2 on the mazda tester.
So either the engine has been rebuilt/replaced with a reman one. OR, somehow the results were affected by either a tester that is not calibrated anymore or the temp of the engine?!?!?!
Thoughts?
Thread
Thread Starter
Forum
Replies
Last Post
BLK 93
3rd Generation Specific (1993-2002)
11
Sep 9, 2015 10:56 AM
ZaqAtaq
New Member RX-7 Technical
2
Sep 5, 2015 08:57 PM




