Watcha P-Pump cummins go Boom!

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Watcha P-Pump cummins go Boom!

Postby thrashingcows » Sat Oct 04, 2014 10:32 am

1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 330K Km's, M&H spacer, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.


Check out the build....http://www.dieseltruckresource.com/dev/ ... 05923.html
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Re: Watcha P-Pump cummins go Boom!

Postby ellis93 » Sat Oct 04, 2014 3:42 pm

Wow! Lots of fancy parts just went to schit! :o
Wonder what happened to it?
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Watcha P-Pump cummins go Boom!

Postby thrashingcows » Sat Oct 04, 2014 4:46 pm

My guess is too much fuel and air = Runaway! Eventually it built too much cylinder pressure and the head studs gave up the valiant effort of trying to hold all that cylinder pressure beneath the head. ;)
1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 330K Km's, M&H spacer, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.


Check out the build....http://www.dieseltruckresource.com/dev/ ... 05923.html
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Re: Watcha P-Pump cummins go Boom!

Postby fatty » Sat Oct 04, 2014 4:54 pm

I've seen this vid a few times before but never an explanation. I wish someone knew so I could quit wondering. :D
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Re: Watcha P-Pump cummins go Boom!

Postby Sutter1stgen » Sat Oct 04, 2014 8:34 pm

Now I see why they wrap cable around pulling motors.
Eric

91'w250 with a new pump. This one doesn't chase itself around in a circle.
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Re: Watcha P-Pump cummins go Boom!

Postby Jonnylightening » Tue Oct 14, 2014 1:09 pm

Yeah Ive seen this video before. Couldn't imagine that feelin seein that big of n investment blowin to pieces.
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Re: Watcha P-Pump cummins go Boom!

Postby dazedandconfused » Tue Oct 14, 2014 4:58 pm

Last time I saw that video they said they were just starting the pull and had fully loaded it when it popped. They should have backed off at the .16 second mark when it really changed tone.
1983 Dodge D150 that has been repowered with a 93 Cummins/518 running gear AKA The Ugly Duck! I would much rather build them then buy them.[
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Re: Watcha P-Pump cummins go Boom!

Postby stillsmokin » Sun Jan 18, 2015 10:57 pm

Excessive back pressure... watch the exhaust balloon right before the motor goes bang. It takes a lot of heat and pressure to stretch exhaust pipe.

Hope the dyno operator had good insurance!
92 W250LE REG CAB, SLED PULLER, S400
93 W350LE EXT CAB, dually, 5 speed
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Re: Watcha P-Pump cummins go Boom!

Postby RCCUMMINS89 » Mon Jan 19, 2015 12:33 pm

For the love all things holy do not tell all of these "professional" engine builders that over on Cummins forum. :roll:

Because drive pressure absolutely in no way is hard on head gaskets. :lol:
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: Watcha P-Pump cummins go Boom!

Postby dazedandconfused » Mon Jan 19, 2015 12:36 pm

RCCUMMINS89 wrote:For the love all things holy do not tell all of these "professional" engine builders that over on Cummins forum. :roll:

Because drive pressure absolutely in no way is hard on head gaskets. :lol:

That's why their sthi is always screwed up
1983 Dodge D150 that has been repowered with a 93 Cummins/518 running gear AKA The Ugly Duck! I would much rather build them then buy them.[
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Re: Watcha P-Pump cummins go Boom!

Postby Sutter1stgen » Fri Jan 23, 2015 9:36 pm

RCCUMMINS89 wrote:For the love all things holy do not tell all of these "professional" engine builders that over on Cummins forum. :roll:

Because drive pressure absolutely in no way is hard on head gaskets. :lol:


Back when you and I started conversing on CF you had just blown you're head gasket a 3rd or ??? Time. And you were debating getting your head Oringed. I'm pretty sure I got questioned in that thread too.
High cylinder pressure, back pressure, and boost pressure are all different forces. Too much of all three has the potential to do something catastrophic.
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91'w250 with a new pump. This one doesn't chase itself around in a circle.
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Re: Watcha P-Pump cummins go Boom!

Postby RCCUMMINS89 » Fri Jan 23, 2015 9:39 pm

In that thread it had to do with re surfacing the head and what it does to compression.....luckily bc was like uh.......yea, it doesn't change compression.

But, I've been told that I've been wrong about the drive pressure issue by one of the biggest turbo guys on cf. Pretty "crazy" to think that drive pressure has no affect on cylinder pressure.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: Watcha P-Pump cummins go Boom!

Postby fatty » Fri Jan 23, 2015 9:50 pm

I remember when the 6.7 first came out, people were blowing head gaskets left and right with the stock turbo and a tuner. Even with head studs. Then they started swapping to bigger turbos or adding an external gate and the problem went away.
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Re: Watcha P-Pump cummins go Boom!

Postby RCCUMMINS89 » Fri Jan 23, 2015 10:07 pm

Yes sir.... I too remember this.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: Watcha P-Pump cummins go Boom!

Postby DMan1198 » Sat Jan 24, 2015 12:16 am

There's one guy that's adamant that the only reason 6.7's blow hg's is because of the bigger displacement, and completely rules out timing, and drive pressure
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