what is star pattern on piston? pics

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Oct 10, 2011 | 07:24 PM

snakedoc

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From: AL, Reform

what is star pattern on piston? pics

what dose star pattern on piston mean? the 02 motor i have had water in the oil pan and in the cylinders so i broke it down to clean it up to store away. all of the pistons have the same star pattern on them. David Bulla thinks it is for the timing advanced is this so. if so it is strange because the truck was a county truck, and that dont put chips on them? can this happen on stock programing? how long dose it have to be run to get the pattern?

Oct 10, 2011 | 07:40 PM

djanzen

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Injector spray pattern. usually more pronounced after a engine has had a chip or programmer!

Oct 10, 2011 | 07:42 PM

BigAlsPSD

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I think it can come from driving them hard before reaching normal operating temp, likely with a county rig I would imagine.

Oct 10, 2011 | 07:43 PM

Riffraff Diesel

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Totally normally and seen on both stock and tuned engines regardless of tuner.

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Oct 10, 2011 | 08:29 PM

Shake-N-Bake

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From: Mesa AZ

Quote:

Originally Posted by BigAlsPSD

I think it can come from driving them hard before reaching normal operating temp, likely with a county rig I would imagine.

Sounds reasonable. I know the timing is advanced until the oil gets up to a certain temp...even on stock tuning.

Oct 10, 2011 | 08:35 PM

truckeemtnfords

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Djanzen had it right, it is injector spray pattern as it is injected and burnt.

Oct 10, 2011 | 08:37 PM

snakedoc

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From: AL, Reform

Quote:

Originally Posted by truckeemtnfords

Djanzen had it right, it is injector spray pattern as it is injected and burnt.

but should it not be in the cup?

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Oct 10, 2011 | 08:41 PM

BigAlsPSD

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From: Pea Ridge, AR

Quote:

Originally Posted by snakedoc

but should it not be in the cup?

It should be yes, in a perfect well maintained nothing every going wrong world. 3 motors I have had apart all had a star to some extent 2 of them were not very far outreaching. My last motor the star pattern was nearly reaching the cylinder walls, that is a little more aggressive issue with timing problems from what I have heard/read/seen.

Oct 10, 2011 | 09:48 PM

#10

bulla

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From: Louisiana

I knew it was timing related but didn't realize the stock tuning when cold was advancing the timing so much. Must be part of the reason Jody holds back the tunes till closer to operating temp.