Leakdown test - Hot vs cold
 

I performed a leakdown and compression test on my 87 930, 7.5 to 1 RUF 3.4L pistons and cylinders, stock cams. For numerous reasons the engine was stone cold.

Compression: 1 - 153, 2 - 154, 3 - 154, 4 - 151, 5 - 154, 6 - 153.
Leakdown: 1, 2, 5, and 6 - 6%. 3 and 4 - 5.5%.

I like the numbers as far as consistency:), but would anyone like to guess what the numbers would be on a hot engine?:confused:

I'm guessing they were worse due to heat expansion or something. What were they?

should be the same or slightly better. Those are very good numbers.

But then why did he have a disgruntled looking smilie?

I have not done the hot numbers yet. I was thinking they would be better.