I spun a bearing on new motor. I need help with how to proceed with a new short block?

[Jackson1320]

Sure, but as far as I can tell, I haven't heard anyone complain or be worried about their Coyote builds and 2618 pistons that many thousands include either. Or..... anyone stating their engines wore out too soon in the last 7 years because of it. I believe Hellcats and a few other OEM builds that are 700+hp, are using 2618 forgings too, and nobody seems to complain.

Yeah and they have 40% leak down at 30,000 miles

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[Cory S]

Yeah and they have 40% leak down at 30,000 miles

You spelled 4% wrong.

 

[Jackson1320]

You spelled 4% wrong.

prove it

 

[Unas2k5]

Ok I told them. He said the bearings are clevite.

 

[Jackson1320]

You spelled 4% wrong.

they have more then 4%

Ok I told them. He said the bearings are clevite.

Yeah but bi-metal or tri-metal

 

[Cory S]

they have more then 4%

Prove it......

Even 2.5% leak down on any modern engine after 30K is considered normal/average.

 

[Unas2k5]

they have more then 4%

Yeah but bi-metal or tri-metal

He didn’t specify. He’s the guy who puts the quotes together. I’ll ask him when I get on the phone with him later

 

[Jackson1320]

[/QUOTE]
a tri-metal bearing is generally stronger but the does not last long on the street. a bi-metal bearing is more forgiving and best for the street

 

[Jackson1320]

Prove it......

Even 2.5% leak down on any modern engine after 30K is considered normal/average.

1-10% good,10-20% ok, over 20% bad. i doubt you have 4% at 30000

 

[K4fxd]

 

[engineermike]

Fwiw the top ring gap spec for a gt500 is only .008-.012. I just spot check measured a stock one at .009.

 

[Unas2k5]

Went with 4032 pistons and 11:1 compression

 

[Jackson1320]

Fwiw the top ring gap spec for a gt500 is only .008-.012. I just spot check measured a stock one at .009.

how far down is the ring from the top of the piston?

 

[engineermike]

Fyi predator/gt500 pistons vs gen3 coyote. I’m pretty sure predator pistons are forged.

 

[GregO]

I’m pretty sure predator pistons are forged.

Forged, both GT350 & GT500.

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