slammedS10

Thank you, thats exactly what I am talking about, at least there are a few people that understand things.
Thanks for clearing that up.

meatwad

iTrader: (2)

I'm doing this today. We'll see how it works. I'm due for an oil change pretty soon. The web site for the Trimaxx says that the stage 3 takes about 5-45 miles to do its thing.

slammeds10 did the rep say anything about a recommended interval before changing the oil after using the stage 3 crankcase cleaner?

Black02Z71

The carbon is only a couple thousandths thick, I oiled the cylinders so it looks like its thicker, the texture that you see is part of the piston. Still, its not enough to cause the piston to head contact, and that’s my point. Now carbon on the side of the piston causing piston slap is more believable

slammedS10

No we dont recommend oil changes, he never said it was nec. to do it. So far I am well over a week and no noise has come back. Let me know how it turns out for you.

slammedS10

Carbon build up on the side of the piston is the case . Are you telling me that to the Thousandth of an inch that the carbon build up on the TOP of you piston is is exact all the way across????, Who said anything about the piston hitting the head???

meatwad

iTrader: (2)

All done. Still have some of the cleaner in the gas tank running through. Cold start knock wherever it was coming from was less this morning. I still have some valvetrain ticking but doesn't sound like the knock at all.

I went ahead and changed my oil. I was overdue and per the TRimaxx website I had driven enough, about 45 miles, before changing. My thinking was, with an already dirt filter, it might not effectively clean the additional residue removed. Anyhow brand new Mobil1 is in there now.

TG02Z71

iTrader: (2)

The pistons in the 6.0s were re-designed slightly. I work for a company supplying machines to one of GMs suppliers that makes 6.0 pistons.
The coating on the sides of the pistons was changed slightly as well.
What changed??? Don't know, but the issue was addressed. How well did the changes work?? Seems like they are better but still not very good.
The way I see it is if you get some piston slap and its not hurting anything its more of an annoyance than anything.
Part of the reason GM vehicles get better mileage and performace is from looser fitting parts. Sloppy no! Looser for higher power output and better economy...yes!
The skirts on the pistons in these engines is very short compared to the GM engines of old. This is probably part of the slap reason, as well as the fact that the pistons are machined with a slight oval profile so they grow into being round. (heat)
Thats the nature of cast pistons and the wall thickness variation in the overall design of the part.
Just some real world info being presented.

slammedS10

thanks alot for the info.