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Old 02-06-2017, 03:17 PM   #1
1000orbust

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Piston selection for a 6.7

As the title states I'm wavering back and forth on my piston selection. I have late 04.5-07 injectors for my 6.7 Cummins and I'm stuck between the industrial bowl design which I've read great things about and diamond customs with a late 04.5-07 bowl design (if I should ask for an industrial bowl design I don't know). I know my injectors will work with both but I feel like the industrial bowl will give me more flexibility with timing. Are diamonds pistons really necessary for a build under 1500hp? My goal is 12-1400. The truck will never see the road and will be used for competition drag racing and sped pulling only. The last thing I want to do is burn up a piston after putting all this time and money into my engine build. Any opinions from people that have real experience would be appreciated.
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Old 02-06-2017, 03:23 PM   #2
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What is known as the 6.7L "industrial" piston has the same bowl design concept as the '04.5-07 Cummins automotive piston, and the cone angle in the factory application is only 4° wider.
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Last edited by Smokem; 02-06-2017 at 03:24 PM.
 
Old 02-06-2017, 03:33 PM   #3
1000orbust

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Weston,
If you had to pick one bowl over the other knowing what you do about pistons, which one would you go with. Do you have anymore thoughts? Do you have concerns or have you seen failures with the industrial pistons at this power level? Thanks.
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Last edited by 1000orbust; 02-06-2017 at 03:36 PM.
 
Old 02-09-2017, 09:36 PM   #4
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Quote:
Originally Posted by 1000orbust View Post
As the title states I'm wavering back and forth on my piston selection. I have late 04.5-07 injectors for my 6.7 Cummins and I'm stuck between the industrial bowl design which I've read great things about and diamond customs with a late 04.5-07 bowl design (if I should ask for an industrial bowl design I don't know). I know my injectors will work with both but I feel like the industrial bowl will give me more flexibility with timing. Are diamonds pistons really necessary for a build under 1500hp? My goal is 12-1400. The truck will never see the road and will be used for competition drag racing and sped pulling only. The last thing I want to do is burn up a piston after putting all this time and money into my engine build. Any opinions from people that have real experience would be appreciated.
If you have late 04.5-07 injectors, wouldn't they be 124*? Those don't match up with the closed bowl.
 
Old 02-09-2017, 11:55 PM   #5
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I'm going to be running the QSB industrial pistons in my 6.4 build utilizing my 06 5.9 head and Exergy BMS 150% late pattern injectors.
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Old 02-10-2017, 07:28 AM   #6
ramthiscummins

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Originally Posted by fatgraderman View Post
If you have late 04.5-07 injectors, wouldn't they be 124*? Those don't match up with the closed bowl.
It would depend who they are from. They are either the stock VCO nozzles (124*) or they are the BMS (128*) nozzles.
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Old 02-10-2017, 09:26 AM   #7
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so 128* is what you are looking for with QSB pistons?
 
Old 02-10-2017, 09:44 AM   #8
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Quote:
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If you have late 04.5-07 injectors, wouldn't they be 124*? Those don't match up with the closed bowl.
Quote:
Originally Posted by ramthiscummins View Post
It would depend who they are from. They are either the stock VCO nozzles (124*) or they are the BMS (128*) nozzles.
Never mind. I was thinking one of the options he was considering was comparable to the original closed bowl. It was a brain fart.
 
Old 02-10-2017, 10:10 AM   #9
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Quote:
Originally Posted by ramthiscummins View Post
or they are the BMS (128*) nozzles.
They are not a "special" nozzle, companies can call them Bosch Motor Sport if they want, but they are simply from the Case tractor application, there are both VCO and micro-blind sac type versions.
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Old 02-10-2017, 09:37 PM   #10
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FWIW I burned a whole set of CR pistons in my mechanical 5.9 this year in 3 pulls and a handful of dyno passes at about 1200 HP. However my engine was running a good bit of compression. It has Diamonds in it now without a shred of trouble.
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Old 02-11-2017, 12:37 AM   #11
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What about D&J FSR Pistons? They have been proven good for street and race use.
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Old 02-13-2017, 08:15 PM   #12
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I have a set of late 5.9 design FSR's from Drew going into my build here soon.
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Last edited by 00 black ram; 02-13-2017 at 08:21 PM.
 
Old 02-13-2017, 08:17 PM   #13
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Those are what I'm planning on going with and having Weston design the bowls.
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