gametech

iTrader: (1)

I recently had to replace my whipple supercharger on my 4.8L truck after a little over 140K miles. The truck has 266K on it, and the blower was put on at a little over 120K miles. What caught my attention was that the plugs, which had been in since the initial blower install, showed severe detonation on 2 cylinders. This wasn't entirely unexpected, as the original tune with the blower was crap (this was back in 2003, before I started tuning for myself). What WAS surprising is that looking at the pistons showed NO signs of detonation damage. Even more surprising is that I could still see some slight crosshatch pattern in the bores. I'm sure this can't be normal, but has anyone else seen similar results? With over 265000 miles, I expected the bores to be worn to a mirror finish.

1badnova496

iTrader: (19)

I've seen it on a 5.3 with 160k

gametech

iTrader: (1)

Did the motor have any oil consumption? I see about 1/2 to 2/3 of a quart loss betwen 6-8K mile oil change intervals. I just don't understand why this motor seems to be working this well. Especially considering that there is still some crosshatch on the bores, I would expect significantly higher oil consumption. My only guess thus far is that the rings aren't as hard as the bore, and at some point I will experience a catastrophic failure once they wear out. I hope I'm wrong, but I've gotten so much service out of that engine that I really don't care.

allthrotle

iTrader: (2)

How can you not understand why the motor working so well? its an ls based motor but, I am still impressed with that many miles with boost and its still in that good of condition.

eallanboggs

iTrader: (1)

Crosshatch is good, but did you find a ridge at the top of the cylinder bores? If not it would appear this motor just just came out of the crate to an uniformed observer. Are you running Mobil1?

snake charmer

iTrader: (118)

+1 on the mobil 1