Duramax Diesels Forum Truck of the Week
  #16  
Old 11-17-2015, 09:18 AM
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I've been running ovals in my truck (set #1) for about 5 years now. I've lost track of the mileage. Somewhere north of 30K miles. Other early adopters have gone much further pushing them much harder.

The only piston failures to date have been to the upper ring land as I have posted before. Never a crack across the top. I feel the failure is avoidable with proper warm up of the pistons before going to ludicrous power and is only an issue with the cast pistons with the oil gallery right behind the ring land.

The jury is still out on economy. The pistons are rarely in a pure stock application. Even so, I know that they do not absorb heat as fast as stock bowl pistons.

Lastly, what I don't talk about much is that several of the same piston manufacturers that he is dealing with, approached me at one time or another wanting to produce oval bowls.
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  #17  
Old 11-17-2015, 09:34 AM
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Quote:
Originally Posted by Fingers View Post

Lastly, what I don't talk about much is that several of the same piston manufacturers that he is dealing with, approached me at one time or another wanting to produce oval bowls.
Do you have a patent on them?
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  #18  
Old 11-17-2015, 09:40 AM
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No patent. Not enough market to cover the cost.
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But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
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  #19  
Old 11-17-2015, 11:25 AM
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Another satisfied oval bowl owner here. I think the results speak for themselves.
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  #20  
Old 11-17-2015, 11:35 AM
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The funny part is Hogue really doesn't understand the purpose, his rail is always broke down from one failure or another. I can only imagine if he pulled his head out of his ass and built something that's actually reliable.
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  #21  
Old 11-17-2015, 11:50 AM
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Just off the phone with a previous customer. His 3 year old ovals are going into their 3rd block with new rings. They have some surface pitting, but otherwise are in good shape.
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But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
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  #22  
Old 11-17-2015, 12:01 PM
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I have them in mine, satisfied so far
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  #23  
Old 11-17-2015, 12:31 PM
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I've got a customer with an Lmm with 20 over 15.5:1 ovals, some other mild things, stock fuel. Averages same economy as it did stock deleted. He has about 30k on his now towing heavy


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  #24  
Old 11-17-2015, 03:26 PM
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Glad you commented Jon. Sorry that dick gnat spews more hot air than a 90 y.o. with the walking farts.


I assume that thread was locked and you weren't able to school/educate him in his thread because he was bashing you, a supporting vendor, while he's not a supporting vendor? Or were other posts deleted prior to it being locked?
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  #25  
Old 11-17-2015, 06:03 PM
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It was closed because it went sideways very fast and we were trying to avoid a train wreck again. Believe me when I say he's on thin ice.
As far as the ovals go anyone that follows this forum knows the reasoning behind them. They are a great idea and seem to be working as designed.

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  #26  
Old 11-17-2015, 06:42 PM
trailler2004 trailler2004 is offline
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Jon
I have beat the living f#%k outa mine all summer
200% injectors and decent set of twins
I will be pulling them out somtime this winter to see what my blow by issue is
Not sure if the rings didn't seat or what
Will let u know what we find
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  #27  
Old 11-17-2015, 06:45 PM
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Quote:
Originally Posted by trailler2004 View Post
Jon
I have beat the living f#%k outa mine all summer
200% injectors and decent set of twins
I will be pulling them out somtime this winter to see what my blow by issue is
Not sure if the rings didn't seat or what
Will let u know what we find
What were your ring gaps?
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  #28  
Old 11-18-2015, 02:22 PM
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What he is saying goes against not only the oval piston design but cylinder head design as we'll. We all know flat positions do NOT promote swirl. If they did diesel cylinder heads wouldn't be flat. And to say ovals were not engineers around combustion dynamics is insane! Sure fuel is more exposed in a flat piston design design but that doesn't mean fuel will burn completely. I'm gonna leave it to that before I get more POd!
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  #29  
Old 11-18-2015, 07:45 PM
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Quote:
Originally Posted by Stancedlb7 View Post
What he is saying goes against not only the oval piston design but cylinder head design as we'll. We all know flat positions do NOT promote swirl. If they did diesel cylinder heads wouldn't be flat. And to say ovals were not engineers around combustion dynamics is insane! Sure fuel is more exposed in a flat piston design design but that doesn't mean fuel will burn completely. I'm gonna leave it to that before I get more POd!
Out of curiosity , do you know why diesel heads are flat?

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  #30  
Old 11-18-2015, 07:55 PM
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Quote:
Originally Posted by S Phinney View Post
Out of curiosity , do you know why diesel heads are flat?

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Because the combustion occurs in the piston area, while gasoline engines combustion in the cylinder head.
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