smoothdurban
I do my own stunts
- Joined
- Jan 4, 2013
- Location
- Kemble Ontario
Guys
I recently had a b230FT rebuilt and I just completed my second oil change after a 300 mile break in.
Out of curiosity I decided to do a compression test and check the conditions of the plugs.
Plugs all look good as I expected as I wasn't encountering any performance issues. So I figured I would do a compression test.
I did the test hot with the fuel pump relay disconnected, and the throttle open.
I did the compression test from cylinders 4 to 1
My numbers are (1 - 4)
149, 148, 148, 121
I was a bit surprised by the 121 on cylinder #4 so I decided to do a leak down test.
theses are my leak down numbers (1 - 4)
100 - 97, 100 - 94, 100 - 96, 100 - 95
During the leak down test I did here some hissing noise in the crank case via oil dip stick tube as well as when removing the the valve cover cap but the hissing was minor
The audible hissing was the same for all cylinders.
What gets me is how low the compression on cylinder #4 is compared to the other three cylinders.
Any ideas what else I should check or is it to early to consider the break in done?
I recently had a b230FT rebuilt and I just completed my second oil change after a 300 mile break in.
Out of curiosity I decided to do a compression test and check the conditions of the plugs.
Plugs all look good as I expected as I wasn't encountering any performance issues. So I figured I would do a compression test.
I did the test hot with the fuel pump relay disconnected, and the throttle open.
I did the compression test from cylinders 4 to 1
My numbers are (1 - 4)
149, 148, 148, 121
I was a bit surprised by the 121 on cylinder #4 so I decided to do a leak down test.
theses are my leak down numbers (1 - 4)
100 - 97, 100 - 94, 100 - 96, 100 - 95
During the leak down test I did here some hissing noise in the crank case via oil dip stick tube as well as when removing the the valve cover cap but the hissing was minor
The audible hissing was the same for all cylinders.
What gets me is how low the compression on cylinder #4 is compared to the other three cylinders.
Any ideas what else I should check or is it to early to consider the break in done?
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