Duramax Diesels Forum Truck of the Week
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Old 04-17-2017, 08:56 AM
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Default Cracked Piston solutions

Has anyone ever replaced stock Pistons with mahle Pistons without balancing the rotating assembly? I know for years people were cutting and costing Pistons and not having any trouble. Why couldn't you just swap all 8 Pistons and roll on with a stock application?
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Old 04-17-2017, 09:05 AM
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I've heard of guys doing it.
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Old 04-17-2017, 09:08 AM
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I have done it with no problems.
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Old 04-17-2017, 09:21 AM
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Quote:
Originally Posted by JDPlowboy View Post
Has anyone ever replaced stock Pistons with mahle Pistons without balancing the rotating assembly? I know for years people were cutting and costing Pistons and not having any trouble. Why couldn't you just swap all 8 Pistons and roll on with a stock application?
its been done, problem is you are increasing the chances of a breaking a crank and hurting the stock bearings more (assuming stock bottom end). if you dont care, roll on!!
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best time to date: 12.39

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Old 04-17-2017, 09:39 AM
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Quote:
Originally Posted by Chevy1925 View Post
its been done, problem is you are increasing the chances of a breaking a crank and hurting the stock bearings more (assuming stock bottom end). if you dont care, roll on!!
Yep lol several guys down here do this. 15k miles later there bearings look like they have 150k on them. And most of those engines done like that have a nice vibration at idle and at 1800-2000rpm from what I can tell riding in them. No thanks.
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Old 04-17-2017, 09:42 AM
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If you have a few to pick from, you could weigh each piston and replace it with the closest one in weight. These engines are so far from perfect balance from stock that you wouldn't believe it.

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New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
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Old 04-17-2017, 09:52 AM
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Quote:
Originally Posted by 04jimc View Post
If you have a few to pick from, you could weigh each piston and replace it with the closest one in weight. These engines are so far from perfect balance from stock that you wouldn't believe it.

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That's what I have noticed when replacing stock Pistons with stock Pistons. The stock weight has so much variance!
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Old 04-17-2017, 09:55 AM
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If I balanced the rods to Pistons I could see that being done. But I'm just trying to stay away from
Taking the crank out
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Old 04-17-2017, 09:58 AM
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Quote:
Originally Posted by 04jimc View Post
I have done it with no problems.
Ok, a pm made me reread the original post. I misread it. I thought jd asked if anyone swapped stock-for-stock Pistons. I have never swapped a stock for a Motorsport piston. However, if for some reason the Motorsport Pistons would weigh the same or a few grams variance, then I would definitely do it. But I doubt they weigh near the same. I've never weighed the two compared at the same time.

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06 GMC CC DRW-Gone
08 GMC CC DRW-Gone
New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
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Old 04-17-2017, 10:00 AM
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Quote:
Originally Posted by JDPlowboy View Post
If I balanced the rods to Pistons I could see that being done. But I'm just trying to stay away from
Taking the crank out
why? your damn near to that point as it is.


stock balance is all over the damn place but you are adding MORE weight with the mahle pistons (assuming you are going cast, not forged).
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Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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Old 04-17-2017, 10:03 AM
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Quote:
Originally Posted by Chevy1925 View Post
why? your damn near to that point as it is.





stock balance is all over the damn place but you are adding MORE weight with the mahle pistons (assuming you are going cast, not forged).


Time, money and stock truck. Just trying to get options figured out.
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Old 04-17-2017, 10:05 AM
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I've swapped stock for stock several times and haven't had any problems several years of running under their belts. Just looking for a better option not sure why these lml Pistons junked out.
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Old 04-17-2017, 10:23 AM
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how about some info on the engine you are playing with? 100% stock? what model? if not stock, list mods done to the engine
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Quote:
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 04-17-2017, 11:16 AM
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Lml with 50hp tune. Only modification was straight pipe
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Old 04-17-2017, 11:16 AM
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It's getting a new set of gm Pistons and rings
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