Originally Posted by Tim @ LSX Transport

Providing the motor is done right, it is ALL in the tune.

A build motor will only last .5 seconds longer than a stocker if the tune is wrong.

Originally Posted by rotary1307cc

i heart E85

good to hear the LSAs stayed down through that abuse, impressive

Originally Posted by stevieturbo

Detonation does that, and/or lean mixtures which can lead to detonation. Then the tip of the plug gets chewed up down the side of a piston causing more damage

The wear on the skirts isnt that uncommon, especially if it's a stroker. Have the bottoms of the bores been chamfered properly ?, what sort of bore clearance are you running on the pistons ?

My last 402 with Wisecos had a huge 7 thou clearance for some reason. The skirts were visibly polished like that at the bottom. Not ideal, but dont see it as a major problem either. But being so loose in the bore, ring seal wasnt great either.

Does look like a simple tuning issue though.

Originally Posted by Tim @ LSX Transport

A few problems going on here. First that is a TON of wear on a COATED piston skirt. There is definately a piston to wall clearance issue going on, or the motor was overheated bad.

91 octane, 16 psi, and 18 degrees is not a good combination. That car should have been tuned with 10.5-11.0 afr on that kind of pumpgas with less timing.


Providing the motor is done right, it is ALL in the tune.

A build motor will only last .5 seconds longer than a stocker if the tune is wrong.

Originally Posted by TWS

+1

I'm running 16* timing on only 10 psi of boost with 93 octane. Can't make an apples to apples comparison since the builds are different, but his seems like too much timing for that much boost and too little octane.