Compression test done AGAIN, UPDATE 11-21-05
11-04-2005, 01:59 PM
#1
Thread Starter
Compression test done AGAIN, UPDATE 11-21-05
How much oil do people put into the actual spark plug hole to see if the rings are bad?
I have a feeling that it has more to do with my head than my pistons but would like to double check.
Any thoughts on the variance of more than 15psi on the #4 cylinder.
Thanks
UPDATE
Well it snowed so I had to cancel my leak down test.
Snow is gone now and did a warm compression test with the following results
205.215.225.210
I did a wet test as well with the following results
245.265.265.270
Thoughts or comments on block condition.
I have a feeling that it has more to do with my head than my pistons but would like to double check.
Any thoughts on the variance of more than 15psi on the #4 cylinder.
Thanks
UPDATE
Well it snowed so I had to cancel my leak down test.
Snow is gone now and did a warm compression test with the following results
205.215.225.210
I did a wet test as well with the following results
245.265.265.270
Thoughts or comments on block condition.
11-05-2005, 12:09 AM
#4
Thread Starter
yup, on a cold motor.
I was running 5.5 to 10 pounds of boost.
When I got my car back last year I noticed that my timing was way retarded at a big 3 degrees at 10 pounds at 5000rpm.
I am in the process of putting the car back to stock for a smog check due soon and would like to keep the motor stock.
If I have to, I will build it if my motor is damaged
Oh, my car eats a quart of oil each gas fill up!!!!
I was running 5.5 to 10 pounds of boost.
When I got my car back last year I noticed that my timing was way retarded at a big 3 degrees at 10 pounds at 5000rpm.
I am in the process of putting the car back to stock for a smog check due soon and would like to keep the motor stock.
If I have to, I will build it if my motor is damaged
Oh, my car eats a quart of oil each gas fill up!!!!
11-05-2005, 07:02 AM
#6
Former Moderator
Do a leakdown test. Chances are #4's rings aren't sealing as good anymore.
Due to intake manifold design, and placement in the engine compartment #4 runs leaner and hotter than the other cylinders.
Due to intake manifold design, and placement in the engine compartment #4 runs leaner and hotter than the other cylinders.
11-05-2005, 09:43 AM
#7
Registered User
Join Date: Dec 2004
Posts: 1,359
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by f20kills,Nov 5 2005, 04:09 AM
yup, on a cold motor.
Trending Topics
11-05-2005, 01:28 PM
#10
Registered User
Join Date: Nov 2005
Location: mt washington,ky
Posts: 202
Likes: 0
Received 0 Likes
on
0 Posts
On a wet test you put 1 to 2 squirts of oil in the cylinder. If the numbers do not come up with the wet test the leak you have is somewhere on the top half in the head somewhere. The rule of thumb is you have a problem if one cylinder has more than 15 psi difference between the rest. Good luck