extremetoy

iTrader: (17)

heres a couple pics... it was blowing smoke and started stumbling at idle... felt a little down on power and had only 40 psi of compression so i decided to pull the motor and this is what i found

stock rods are fine, only running 10 psi and made about 600hp/tq

98Z28CobraKiller

iTrader: (17)

What's the top look like?

extremetoy

iTrader: (17)

theres like 5 small very small pits that are right near the writing on the piston from pieces going through im sure

Zombie

iTrader: (2)

Is that 2nd ring broken or is that where the gap use to be. What were the rings gapped at?

extremetoy

iTrader: (17)

yea just the second ring is broke in a couple places... i cant remember what i gapped them to, it was whatever my machinist told me to... i have it written down ill look around

98Z28CobraKiller

iTrader: (17)

Who's piston is that? That is weird. Never seen one just break underneath like that. What hole was that in?

extremetoy

iTrader: (17)

its a mahle -4cc maybe 12,000 miles prob 7,000 w/ forced ind. and about 30 1/4 mi passes it was in the #2 hole

kbracing96

iTrader: (25)

Wasn't enough ring gap. Ends butted together and broke the ring land.

ChevyChad

iTrader: (50)

dang! yea, thats a weird way to break. I've never seen that before

TARZAN

iTrader: (12)

I can't see the pictures b/c I'm at work....but reading what is said I'd guess either you ran that particular cylinder rich and some fuel got under the rings, or the rings were gapped too tight.

-Will

MIGHTYMOUSE

iTrader: (59)

i broke some mahle pistons like that, then kurt urban got with them and added these gussets (see left)

MUSTANGBRKR02

iTrader: (91)

I've had bad experiences with Mahle pistons also.

99Ws6TransAm

iTrader: (43)

I have a set of diamond pistons brand new for sale if your interested.

veee8

iTrader: (40)

Were those 2618 customs?
What year did Kurt have those updated?

daniel6718

iTrader: (36)

needed more ring gap

MIGHTYMOUSE

iTrader: (59)

the pic was dated july 05 when we got those.. sounds about right

extremetoy

iTrader: (17)

were they breaking because of too little ring gap like someone else said or is it just those pistons, or a tune... btw why have all that custom work done instead of just going with a different piston alltogether.

MIGHTYMOUSE

iTrader: (59)

i doubt w2w was setting the ring gap up wrong on mine.

fair to say, thought that i can put a hurting on a set of pistons

u'd have to ask kurt why he chooses mahle.

veee8

iTrader: (40)

The custom pistons W2W was using were generally 2618 material not the 4032 powerpak pistons.