Pensacola Fishing Forum banner
1 - 6 of 6 Posts

·
Registered
Joined
·
259 Posts
Discussion Starter · #1 ·
Just wondering. If a motor has compression of 120 to 110 on acyliders except one that is 100. not a good sign right?
 

·
Registered
Joined
·
869 Posts
tried to post before the conversion.....

Just wondering if this is how you did the compression test:

remove all spark plugs
ground ALL spark plug wires to the block
hold the throttle Wide Open
crank the motor over until the PSI gauge stops rising; repeat for each cylinder.

It's possible to get significantly different compression numbers if the test is not done like this. Probably if all plugs were not out and you were not holding throttle Wide Open the numbers you get would be a little lower than actual.
 

·
Registered
Joined
·
1,266 Posts
<span style="font-weight: bold;">bigrigz is exactly right....
Fully charged batteries is also important.
Your compression is fine, don't sweat it....
 
1 - 6 of 6 Posts
Top