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Old 09-12-2018, 04:27 PM   #1
QMFB
 
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Crankcase pressure

Ok, I just built a 6.4L Cummins, and I am getting a LOT of blow-by. I built my own 1/2 gallon catch can (not returned piped yet) and I am getting a steady stream of (surprisingly cold) air coming from the can vent.
Can itself is catching almost a quart every 50 miles.
No "pulse" no "steam", no "choo, choo"....

Should I be looking at the turbos ?
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
Old 09-12-2018, 04:51 PM   #2
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If I power brake it, (stand on the brake and build boost) up to 20psi, oil ABSOLUTELY squirts out of the oil fill cap... WTF ?
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
Old 09-12-2018, 05:56 PM   #3
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We just finished a drag build with a 6.4 cummins. We have two -16 hoses off the valve cover going to a 5 gallon puke tank in the rear of the truck. We had a little bit of visible fumes from the puke tank while we were breaking it in on the dyno. Now after 10 dyno runs, 3 1/8 mile passes and 1 1/4 mile pass we have no more visible fumes and no oil has ever been pushed into the tank. I'd say you probably have an issue with the rings or something causing your blow by. Did you assemble the engine or was it assembled for you?
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Old 09-12-2018, 06:32 PM   #4
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What rings are you using? And how many miles? Recently had a similar issue, and it was partially because it took a little longer for the rings to seat. I was using total seal second rings.
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Old 09-12-2018, 07:47 PM   #5
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Id go run the piss out of it.
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puzzy, tune it.

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Old 09-12-2018, 08:25 PM   #6
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Break it in man...

Beat the piss out of it
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Old 09-13-2018, 09:42 AM   #7
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10-4. Thanks fellas.
Yeah, it's under 800 miles on this build, and I haven't been able to beat on it yet because if transmission issues (ATS, always issues).... But it's concerning because it seems to be getting worse, not better.
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
Old 09-13-2018, 09:45 AM   #8
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Quote:
Originally Posted by Yotadzl View Post
What rings are you using? And how many miles? Recently had a similar issue, and it was partially because it took a little longer for the rings to seat. I was using total seal second rings.
I'm using Cummins rings and pistons.... No mahle, no McBee....
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
Old 09-13-2018, 02:00 PM   #9
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Quote:
Originally Posted by QMFB View Post
I'm using Cummins rings and pistons.... No mahle, no McBee....
did you set your ring end gap? Or did you just install the rings on the pistons and put them in the engine?
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Old 09-13-2018, 06:24 PM   #10
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Definitely needs the rings seated. Did my 5 min cam break in then beat the piss out of it.
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Old 09-13-2018, 07:55 PM   #11
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You have to flog it some.
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Old 09-13-2018, 10:07 PM   #12
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Like the last guys said, you gotta run it. Don’t baby it, get those rings to seat. If you have a trailer to put some weight on and tow around, even better. Find some hills to pull.


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Old 09-19-2018, 07:21 AM   #13
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after i built my first one, after the cam break in period, both les and Hamilton told me to hook up to my toy hauler and get it hot, let it idle (heat soak) then repeat.

best of luck, hope its not ring gap!
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Old 09-19-2018, 07:34 AM   #14
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Start simple.
What are you using for a baffle between the oil and the crankcase vent?

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Old 09-19-2018, 08:31 AM   #15
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The baffle that comes with the G&R Diesel valve cover
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
Old 09-20-2018, 03:44 AM   #16
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Quote:
Originally Posted by QMFB View Post
Ok, I just built a 6.4L Cummins, and I am getting a LOT of blow-by. I built my own 1/2 gallon catch can (not returned piped yet) and I am getting a steady stream of (surprisingly cold) air coming from the can vent.
Can itself is catching almost a quart every 50 miles.
No "pulse" no "steam", no "choo, choo"....

Should I be looking at the turbos ?
What was your piston ring side clearance?
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Old 09-20-2018, 07:47 AM   #17
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You mean PTW ?
Had it set at 6 thou.
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
Old 09-20-2018, 07:49 AM   #18
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Loose of OE spec... But definitely not "holy piston slap, Batman!" Territory.
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
Old 09-20-2018, 09:19 AM   #19
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What turbo(s)?

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Old 09-20-2018, 09:29 AM   #20
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In sig... 58/65/14(superB) over Borg 75/96/1.32
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04 CCLB DRW - 6.4 Cummins, HPTuners, 80% S&S, 10mm S&S CP3, AD165, s464 /s475, full billet 48re, Arp's EVERYWHERE, mild head work, lots of time and money... And never done.
 
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