Duramax Diesels Forum Truck of the Week
  #31  
Old 11-18-2015, 07:59 PM
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Compression ignited vs. spark plug ignited
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  #32  
Old 11-18-2015, 08:07 PM
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I knew why but the person I quoted left me to believe maybe he doesn't completely understand why diesel heads are flat and why they would not work very good if they had combustion chambers in the heads. I didn't want to be a smart ass about any of it. That's why I posed the question.

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  #33  
Old 11-18-2015, 08:37 PM
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Would that be "know it all" Greg?
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  #34  
Old 11-19-2015, 03:57 AM
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Quote:
Originally Posted by S Phinney View Post
I knew why but the person I quoted left me to believe maybe he doesn't completely understand why diesel heads are flat and why they would not work very good if they had combustion chambers in the heads. I didn't want to be a smart ass about any of it. That's why I posed the question.

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We have ran a diesel engine at work with flat pistons and bowls in the head..
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  #35  
Old 11-19-2015, 05:31 AM
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We have ran a diesel engine at work with flat pistons and bowls in the head..
I didn't say it's impossible. It's inefficient and problematic. Gas engines atomize fuel in the runners or throttle bodies. Common rail Diesels are direct injected into the cylinder. Atomization occurs from pressures of the fuel and minimal from piston design.

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  #36  
Old 11-19-2015, 12:08 PM
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Quote:
Originally Posted by S Phinney View Post
I didn't say it's impossible. It's inefficient and problematic. Gas engines atomize fuel in the runners or throttle bodies. Common rail Diesels are direct injected into the cylinder. Atomization occurs from pressures of the fuel and minimal from piston design.

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Exactly the point! Having a flat top piston gives the same results, inefficiency. Let alone having both piston and head flat....
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  #37  
Old 11-19-2015, 12:18 PM
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Exactly the point! Having a flat top piston gives the same results, inefficiency. Let alone having both piston and head flat....
There is a point at which that is true. The shallower bowl is better than a deep bowl. The less shallow you go the bigger and flatter the bowl becomes. Some crown in the bottom of the bowl should occur but I don't beleive there is enough testing to show at what point you become the most efficient that you can get. It would be wonderful if that occurred but the test subjects required to prove such theories just won't happen.

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  #38  
Old 11-19-2015, 12:23 PM
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Originally Posted by hntngkd View Post
We have ran a diesel engine at work with flat pistons and bowls in the head..

hey wait a minute don't you work at GM? so GM was testing this out?
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  #39  
Old 11-19-2015, 12:45 PM
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hey wait a minute don't you work at GM? so GM was testing this out?
Not on a duramax.
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  #40  
Old 11-19-2015, 12:55 PM
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Default Gas engine

What about a direct injected gas engine? the still have a chamber.
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  #41  
Old 11-19-2015, 02:03 PM
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I'm not sure at what point they are spraying fuel in the DI gas engines, but I assume it's far enough before spark occurs that it doesn't matter.
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  #42  
Old 11-19-2015, 05:40 PM
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I have dealt with Greg and I have dealt with Fingers. Fingers is by far the man when it comes to cylinder knowledge. I still use his cylinder pressure monitor, to this day. How many years has that been, Jon? He doesn't do or build anything half ass.
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  #43  
Old 11-19-2015, 05:50 PM
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Tbt
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  #44  
Old 11-19-2015, 07:09 PM
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Quote:
Originally Posted by PureHybrid View Post
I'm not sure at what point they are spraying fuel in the DI gas engines, but I assume it's far enough before spark occurs that it doesn't matter.

I've actually heard they are turning off spark on gas DI engines at some points


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  #45  
Old 11-19-2015, 07:25 PM
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Quote:
Originally Posted by hntngkd View Post
We have ran a diesel engine at work with flat pistons and bowls in the head..
Quote:
Originally Posted by Porno Joe View Post
hey wait a minute don't you work at GM? so GM was testing this out?
Quote:
Originally Posted by hntngkd View Post
Not on a duramax.
So GM is reviving the 5.7 Olds diesel?
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