Duramax Diesels Forum Truck of the Week
  #16  
Old 04-17-2017, 11:23 AM
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It's getting a new set of gm Pistons and rings
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Old 04-18-2017, 01:10 PM
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I did a Mahle upgrade to a LLY some years ago and didn't balance it. As mentioned above they are a few grams heavier than stock. Spun it 3-4k for extended periods, it's still running fine today...

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  #18  
Old 04-19-2017, 07:17 AM
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I did a Mahle upgrade to a LLY some years ago and didn't balance it. As mentioned above they are a few grams heavier than stock. Spun it 3-4k for extended periods, it's still running fine today...

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This is what I was looking for. The factory rotating assembly is just roughly balanced from the factory anyways.
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  #19  
Old 04-19-2017, 07:33 AM
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This is what I was looking for. The factory rotating assembly is just roughly balanced from the factory anyways.
ah yes cause one engine that has "lasted" is all we need for good info now a days
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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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  #20  
Old 04-19-2017, 08:28 AM
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I ask two well respected engine builders about the balance deal before deciding. The weight difference for Rpm range was not enough to be concerned with. If spinning 8k they said certainly do it, but no need for less than 4k engines.

I posted the actual weight difference on here back in 2010 under my Cracked Piston thread.

That said, my new billet crank engines are balanced to within a gram overall with even the oil weight accounted for..

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  #21  
Old 04-19-2017, 08:37 AM
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I posted the actual weight difference on here back in 2010 under my Cracked Piston thread.
Can you find it? I cant
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  #22  
Old 04-19-2017, 08:37 AM
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I searched as well and couldn't find any threads.
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  #23  
Old 04-19-2017, 08:42 AM
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Quote:
Originally Posted by kidturbo View Post
I ask two well respected engine builders about the balance deal before deciding. The weight difference for Rpm range was not enough to be concerned with. If spinning 8k they said certainly do it, but no need for less than 4k engines.

I posted the actual weight difference on here back in 2010 under my Cracked Piston thread.


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i respectfully disagree, i have talked and worked with some well known builders as well. i dont speak from second hand info either. what ive posted is exactly what ive seen personally from throwing heavier pistons in an unbalanced, stock block. pull that engine down you threw the pistons in and post up some pics of the bearings, they wont look happy and clearances will be pretty open and as i stated before, its more weight/harmonics on a known crank issue.

if you dont care and dont mind the engine failing at some point to try this, its one thing but when you want it to last and dont want the put the money into an engine, thats a different story. Blake also aint no newb to it either, i dont doubt what hes seen as we talk about stuff/ideas all the time
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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
Tailgate Crew Member #4
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  #24  
Old 04-19-2017, 08:45 AM
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Cause was on the other forum.. lol
I'm looking too.. I know I took pics of the pistons on my digital scales.



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  #25  
Old 04-19-2017, 08:46 AM
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Originally Posted by Chevy1925 View Post
i respectfully disagree, i have talked and worked with some well known builders as well. i dont speak from second hand info either. what ive posted is exactly what ive seen personally from throwing heavier pistons in an unbalanced, stock block. pull that engine down you threw the pistons in and post up some pics of the bearings, they wont look happy and clearances will be pretty open and as i stated before, its more weight/harmonics on a known crank issue.



if you dont care and dont mind the engine failing at some point to try this, its one thing but when you want it to last and dont want the put the money into an engine, thats a different story. Blake also aint no newb to it either, i dont doubt what hes seen as we talk about stuff/ideas all the time


So how does a stock engine that isn't blueprinted last 300k?
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  #26  
Old 04-19-2017, 09:01 AM
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So how does a stock engine that isn't blueprinted last 300k?
all stock engines are blueprinted to an extent. you mean balanced. its stock, no added hp or rpm, and gm accounts for MOST of the weight in the crank counter weight and balancer/fly wheel. its the same reason you dont put an LBZ balancer on a LLY or vise versa and so on
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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
Tailgate Crew Member #4
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  #27  
Old 04-19-2017, 09:07 AM
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Best thing to do IMO, if time and $ were available, would be to get a set of Motorsports cast pistons and have the pins lightened to make up some(hopefully all) of the weight difference.

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08 GMC CC DRW-Gone
New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
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  #28  
Old 04-19-2017, 09:08 AM
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Found em...

4 grams diff on stock LLY vs Mahle [+.020" I think] with valve reliefs.

I was gonna say only 4g earlier but didn't wanta commit. Been told that 1.5g range is not uncommon within a set, so your only talking about 2.5g difference from stock. In a Duramax, that's like the least of your bottom end worries...
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  #29  
Old 04-19-2017, 09:23 AM
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Originally Posted by kidturbo View Post
Found em...

4 grams diff on stock LLY vs Mahle [+.020" I think] with valve reliefs.

I was gonna say only 4g earlier but didn't wanta commit. Been told that 1.5g range is not uncommon within a set, so your only talking about 2.5g difference from stock. In a Duramax, that's like the least of your bottom end worries...
LLY piston is not the same as an LML piston though....
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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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  #30  
Old 04-19-2017, 09:24 AM
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If I'm not worried about the rods I'm not worried about 2 grams lol
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