Minimal Compression

[240nspec]

Have a KaDe, Compression test resulted in 152 psi across cylinders 1,2,4 and 153 on 3. Is there a possible reason for such lower compression across all of these cylinders, or is this nothing to worry about? FSM specs 151 minimal, I doubt all cylinders don't have "leaky" rings, or valves not sealing completely. All fine, or something to be concerned about? Just wondering why minimal compression equally across the board, 140k on the motor. Just wear?

--240nSpec

Also, Engine was at operating temp as well as the TB WOT.
Modified by 240nspec at 9:20 PM 8/14/2008

[Crazyirish]

Sounds ok for those kinds of miles. I wouldn't worry about it personally.

[bruinbear714]

Have a KaDe, Compression test resulted in 152 psi across cylinders 1,2,4 and 153 on 3. Is there a possible reason for such lower compression across all of these cylinders, or is this nothing to worry about? FSM specs 151 minimal, I doubt all cylinders don't have "leaky" rings, or valves not sealing completely. All fine, or something to be concerned about? Just wondering why minimal compression equally across the board, 140k on the motor. Just wear?

--240nSpec

Also, Engine was at operating temp as well as the TB WOT.

Modified by 240nspec at 9:20 PM 8/14/2008

Looks normal to me.

[Vegascorbin]

Just wear?]

You answered your own question. As long as it runs ok no big deal. Block is probably in good shape for a rebuild when you are ready.

[rogoman]

When doing a compression test, make sure the throttle valve is wide open. Spin the motor several times to get the highest reading.