|03-14-2003, 10:08 AM||#1 (permalink)|
Join Date: May 2002
Member # 12036
Compression Test How-to
What are the steps for doing a compression test on a carb engine and what rates of compression shoudl you be seeing on a good motor??
/ SS'd 73 IH Scout II & stuff / Μολὼν λάβε / 74-75 IH 200 4x4 Truck Axles / Resident Attorney at Law
|03-14-2003, 10:51 AM||#2 (permalink)|
Join Date: Oct 2002
Member # 14584
Location: The New and improved Mexico
Disable the ignition.
Hold the gas wide open.
You can pull all the plugs or one at a time.
Screw the tester into the cylinder you want to check.
Turn the engine over and listen for the hits on the tester. 2 or 3 hits is OK. Just make sure you hit each one the same.
Check the reading and write it down keeping track of which cylinder you check.
The amount of pressure you get and the variation between cylinders depends on the engine. You will have to get that info yourself.
As an example my 350 hit between 175 and 180 psi. The compression is 10.5:1.
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Last edited by 6869704x4; 03-14-2003 at 10:55 AM.