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96 850 Turbo puzzeling leak down and compression numbers, tell me what you think 850 1996

posted by  skafasis on  Sat Mar 24 23:35 CST 2007
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last visit: Wed Jan 22 10:01 CST 2014
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I got the following numbers on a 96 850 Turbo motor today and I wonder if anyone can shead some light on what they mean and why they are the way they are. For the leakdown test I put 75 psi into the each cylinder and you can see how many psi it held right next to the listing. All of the numbers are more than the typical 5%. Then when you run the compression test the numbers seem to be higher or better on the ones that have the most leakdown.
On the chart below that I have listed how the cylinders rank in each of the two tests.

To say the least I am very puzzled at why these numbers are where they are. I am looking for any guidance on this issue. Thanks for the help guys.

CYL. Leak Down Comp.
Cyl. 1) 75 -> 57.5 psi --- 145 psi
Cyl. 2) 75 -> 63.5 psi --- 151 psi
Cyl. 3) 75 -> 50.0 psi --- 160 psi
Cyl. 4) 75 -> 67.5 psi --- 150 psi
Cyl. 5) 75 -> 59.0 psi --- 155 psi

Cylinder rank comparison
Cyl. | L.D. |Comp.
-#1-----4------5
-#2-----2------3
-#3-----5------1
-#4-----1------4
-#5-----3------2





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