I did a leakdown test just to make sure my engine is okay to put a cam in, and here are the results at 100 psi in:
Cyl #1 - 91
Cyl #2 - 94
Cyl #3 - 91
Cyl #4 - 94
Cyl #5 - 94
Cyl #6 - 91
Cyl #7 - 95
Cyl #8 - 95
I have seen lots of articles explaining how to perform one of these tests, but not too many on how to read the results (and even then opinions vary). For example, one article said that 0-5% was excellent, 6-14% was good, 15-20% was poor, 23% + was time for a rebuild. Another article said that 3-5% was acceptable for a race motor, 5-7% for a street motor, 10% is weak/ok, 20% + was shot. On a BMW websight it said that at 15% BMW considers a motor shot. Another said that on a compression test you want all cylinders within 10% of each other, and on a leakdown test ideal is less than 10%. But is that less than 10% on EACH cylinder, or less than 10% DIFFERENCE BETWEEN cylinders? I think either way I'm ok. Keep in mind this is an N/A combo that is a nice weather car only with maybe one or two trips to the drags a year.
Cyl #1 - 91
Cyl #2 - 94
Cyl #3 - 91
Cyl #4 - 94
Cyl #5 - 94
Cyl #6 - 91
Cyl #7 - 95
Cyl #8 - 95
I have seen lots of articles explaining how to perform one of these tests, but not too many on how to read the results (and even then opinions vary). For example, one article said that 0-5% was excellent, 6-14% was good, 15-20% was poor, 23% + was time for a rebuild. Another article said that 3-5% was acceptable for a race motor, 5-7% for a street motor, 10% is weak/ok, 20% + was shot. On a BMW websight it said that at 15% BMW considers a motor shot. Another said that on a compression test you want all cylinders within 10% of each other, and on a leakdown test ideal is less than 10%. But is that less than 10% on EACH cylinder, or less than 10% DIFFERENCE BETWEEN cylinders? I think either way I'm ok. Keep in mind this is an N/A combo that is a nice weather car only with maybe one or two trips to the drags a year.