compression test
Thread Starter
Newbie
Joined: Apr 2005
Posts: 42
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compression test
anyone ever perform a compression test on their evo? how does one go about doing this? i actually had one done already and everything was fine but i was just curious how it works? what part of the engine do you read the compression from and how? do you go through one of the spark plug ports or something?
thx in advance.. and yes, i'm a newb
thx in advance.. and yes, i'm a newb
Evolving Member
Joined: Aug 2001
Posts: 242
Likes: 0
From: California
basically you stick a tire pressure gauge in your exhaust pipe and rev the car to 9000 rpm, so you will have to disable your rev limiter to do it... you want to get about 40psi or your bearing are shot...
JK, okay basically all you do is remove the spark plugs put the special compression guage into the hole were the spark plug went, it will thread in, and crank the engine about 3-5 times, this will give you a reading on how much compression is in that cylinder, then do the same thing to all the other cylinders make sure you have a battery jumper box on the battery becuase since your cranking the engine the more power you take from the battery it could effect the results of the test...
Edit: dont forget to disable the ignitoin so the car doesnt start....
JK, okay basically all you do is remove the spark plugs put the special compression guage into the hole were the spark plug went, it will thread in, and crank the engine about 3-5 times, this will give you a reading on how much compression is in that cylinder, then do the same thing to all the other cylinders make sure you have a battery jumper box on the battery becuase since your cranking the engine the more power you take from the battery it could effect the results of the test...
Edit: dont forget to disable the ignitoin so the car doesnt start....
Last edited by EVO7; Jun 13, 2005 at 02:31 AM.
Originally Posted by EVO7
basically you stick a tire pressure gauge in your exhaust pipe and rev the car to 9000 rpm, so you will have to disable your rev limiter to do it... you want to get about 40psi or your bearing are shot...
JK, okay basically all you do is remove the spark plugs put the special compression guage into the hole were the spark plug went, it will thread in, and crank the engine about 3-5 times, this will give you a reading on how much compression is in that cylinder, then do the same thing to all the other cylinders make sure you have a battery jumper box on the battery becuase since your cranking the engine the more power you take from the battery it could effect the results of the test...
Edit: dont forget to disable the ignitoin so the car doesnt start....
JK, okay basically all you do is remove the spark plugs put the special compression guage into the hole were the spark plug went, it will thread in, and crank the engine about 3-5 times, this will give you a reading on how much compression is in that cylinder, then do the same thing to all the other cylinders make sure you have a battery jumper box on the battery becuase since your cranking the engine the more power you take from the battery it could effect the results of the test...
Edit: dont forget to disable the ignitoin so the car doesnt start....
is how ive done it on other cars.. or just find the efi relay.
