View Single Post
  #1  
Old 04-19-2003, 03:30 PM
pesuazo's Avatar
pesuazo pesuazo is offline
Registered User
 
Join Date: Oct 2002
Location: Near Raleigh, NC
Posts: 580
Exclamation 1986 300E Compression Test Results

Please read, comments are welcome.

Drove engine for 15 miles (operating temperature 87C). I used a compressor tester prurchased in Sears for US 25.00. The measured pressure is in PSI.
Cylinder one is the closest to the front of the car, count increases going back. All steps from the manual were followed; removed fuel pump relay, removed the plug (green cable) from the control module of the ignition system.

Cylinder Try 1 Try 2 Try 3 Try 4

1 200 200 200 200
2 197 200 200 200
3 205 205 205 205
4 205 205 205 205
5 215 215 215 215
6 200 205 200 197

My concerns:
The book states "The compression pressure should be between 10 - 12 bar. The wear limit is reached at 8.5 bar".
"The pressure difference between the various cylinders may not exceed 1.5 bars"

1 Bar is approximately 14.5 PSI, so the values should be between
145 PSI - 174 PSI. And the maximum allowable difference among cylinders is 22 PSI.

Obviously I am in very good shape when it comes to pressure difference among cylinders .

BUT 200 to 215 PSI?

Isn't that TOO high or is the tester BAD?
__________________
1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
609 Certified
Reply With Quote