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View Full Version : Anyone have a picture of a 5.9 Common rail piston?


McRat
04-24-2007, 10:30 AM
Need to see how the bowl is shaped to settle a dispute.

lmills
04-24-2007, 10:46 AM
do you want the piston itself? or can a shot of a shortblock do?

Timbeaux
04-24-2007, 10:49 AM
Admit it Pat, you really swapped in a Cummins and are trying to figure out spray patterns..... LOL

lmills
04-24-2007, 10:52 AM
Need to see how the bowl is shaped to settle a dispute.
try these

McRat
04-24-2007, 10:52 AM
do you want the piston itself? or can a shot of a shortblock do?

Need to see what shape the "bowl" in the piston is. Any pic is better than nothing. Here is what a cross section of a Dmax piston looks like:

McRat
04-24-2007, 10:57 AM
Apparently this might be related to piston cracking issues the Dmaxes are seeing on some engines.

Notice how the Dmax bowl has a "lip", this is called a re-entrant bowl shape, because the injector sprays on the flat, the lip, then in the bowl.

Looks like the Cummins is not "re-entrant".

Timbeaux
04-24-2007, 11:00 AM
No.... the Cummins is not "rear-entrant" like the Dmax is LOL

lmills
04-24-2007, 11:03 AM
Pat, I can get a pic of a piston out of the engine later today and will post it this evening for you if you need it.

McRat
04-24-2007, 11:08 AM
THANKS!

Pat

McRat
04-24-2007, 11:09 AM
No.... the Cummins is not "rear-entrant" like the Dmax is LOL

No, it's the 12v OWNERs that are rear-entrant, mostly receivers. :D

Dennis Perry
04-24-2007, 11:11 AM
No.... the Cummins is not "rear-entrant" like the Dmax is LOL

Are you saying the Duramax takes it in the rear:hehe: .

Dennis

Timbeaux
04-24-2007, 11:16 AM
No, it's the 12v OWNERs that are rear-entrant, mostly receivers. :D


You would know alot about looking at the rear of a 12v. LOL I bet you can spell Dodge with your eyes closed LOL

Pat, there is no way you could possibly have any first hand knowledge of 12v owners being rear-entrant.......... You cant get close enough to their rear end to find out LOL

McRat
04-24-2007, 12:27 PM
Are you saying the Duramax takes it in the rear:hehe: .

Dennis

Only if we hit the brakes when a Dodge is behind us! :D

Timbeaux
04-24-2007, 12:33 PM
Only if we hit the brakes when a Dodge is behind us! :D

Run that 10 yet Pat? LOL

McRat
04-24-2007, 02:20 PM
Run that 10 yet Pat? LOL

Hell, I can't even DRIVE it yet!! :D

I'll be cutting it very close for Vegas. Parts that were supposed to arrive still hadn't. :9

Timbeaux
04-24-2007, 02:34 PM
I hope you can make it.

McRat
04-24-2007, 03:30 PM
We are showing up whether or not we have the truck ready. Might almost be fun to go to races as a spectator for once.


NAW!!!:D

DIESEL_POWER
04-24-2007, 05:27 PM
the 03-04 piston is alot different than a 04.5 and up.
it has a re-entrant type of bowl, what advantages or disadvantages do you see with this set up?

McRat
04-24-2007, 05:35 PM
On the Dmaxes, if the lip gets too hot, the piston cracks. A lipless design is being discussed by Guy Tripp of SoCalDiesel, and I think he has a good point.

gstanfield
04-24-2007, 06:45 PM
So you've given up trying to beat us, no you want to copy our pistons in hopes it will make your engine better :)

JK McRat, I have a lot of respect for those Duramaxes, just don't like the wrapper they come in.

George

Phooker
04-24-2007, 09:17 PM
did you know that 9/10 pitchers live alternative lifestyles?

lmills
04-25-2007, 01:22 PM
Hey Pat, here are the pics of the piston out of the motor. As Wade pointed out, this is an 04.5 piston. Earlier years were different.

McRat
04-26-2007, 03:41 AM
Thanks! Excellent pictures!

Billysgoat
04-26-2007, 08:55 PM
? for ya' Pat, do you think the difference could be the amount of metal in the lip?? The CTD piston being larger with more material in the lip might help it deal with the heat better??

Just being curious.

Burner
04-26-2007, 09:54 PM
Why the difference in piston bowls? Does the lip help @ high RPM or make it cool better in stock trim? There must be a difference...I wonder what it is?