DIesel Power Challenge 2011

McRat

McRat

Diesel Hotrodder
Aug 2, 2006
11,249
26
38
64
Norco CA
www.mcratracing.com
juddski88 said:
As for my warranty comment, it was more interesting to see how members of the board felt about built motors and warranty than anything. Believe me, I've already had to deal with it during the past 8 months building my truck, and I am 99.9999% sure I'll have to deal with more in the near future. My thought is, if I was in your shoes, that I would consider warranties on "builds" on a case by case basis ans I'm pretty sure that's what you already do. So hat's off to you.

As far as Owens truck and the pistons, were you using Mahle Forged pistons that were the "same" as Socal's (in metalurgy) or were they more like TTS (in metalurgy)?

Thanks,
Tim
Click to expand...

Piston Thoughts -

Four kinds of pistons failures I've seen:

Cracked across pin - LBZ/LMM is when they push the bushing in wrong and start the crack at the factory. Others from high pressure and temp.

Ring land collapse - Normally when using forged, happens when there is blow-by.

Erosion - Lots of high pressure oxygen, high piston temps, and high fuel pressure will ignite the aluminum pistons. This is the star you see on the crown.

Seizure - High oil temp, tight clearance, high piston temp.

Here's the weird thing. I've hosed a "few" sets of pistons at this point. With both low PW and high PW (rumor has it that high PW wrecks pistons, but so does low PW in my experience), but have never cracked either an LBZ/LLY or Forged. I have seized, eroded, and collapsed rings. High RPM is your #1 enemy it seems. All my piston failures involved 4000+ rpm WOT operation. I wasn't seeing piston issues until I moved the shift points up.

But high RPM is what makes our trucks shift sweet, and saves the driveline and IMO the crank (never had a crank issue).
 
Akdiesel

Akdiesel

IFS Hater
Aug 23, 2009
2,213
0
0
Fairbanks
Wouldn't keeping the RPM's higher also help keep you out of the peak torque area and save your rods a bit as well? If so it seems that it's more of a gamble of what you'd rather risk: rod failure or piston failure. I know personally I'd rather drop a piston than ruin a block.
 
Akdiesel

Akdiesel

IFS Hater
Aug 23, 2009
2,213
0
0
Fairbanks
juddski88 said:
With a built motor I wouldn't be one to worry about the rods if they were a proven brand
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Guess I should have clarified a little better. I was looking at it from my perspective: one without a built motor...I would rather run higher Rs and risk piston failure than rod failure at lower Rs....good example is Travis with his stock puller motor (not so stock anymore) at 750+hp for two or so seasons
 
J

J Spruill

bringer of truth
Mar 30, 2008
770
0
16
when i was at dpc i was the only guy who kept the hood cloosed. i was tryn to scatter parts and i didnt want anybody to loose an eye.it was a fun time,i hope all who competed had a great time...
 
Subman

Subman

Old Geezer
Jun 27, 2008
3,233
10
38
80
Madras, OR, Pahrump NV
These built motors definetly have a short life at WOT, I don't care who builds them. We have scattered three engines and all were built with the hopes of them lasting 20 minutes at WOT, only one made it. DPC is brutal on these trucks, I'm surprised any of them survived especially in Denver. Bad enough on a lighter drag truck, totally crazy on a truck that has to survive all of those different events set up with the same tires. To be honest the DPC is totally losing its appeal and my interest. I didn't know it had been run or that it was in Denver till I saw this thread. I think it need a reality check and total rework to get back to what was intended when they started.
 
paint94979

paint94979

Beer Nazi
Sep 18, 2006
11,715
8
38
37
Ya I don't see some peoples obsession with destroying your engine/transmission/retirement fund on competing in the DPC... IMHO its one thing driving 10hrs to an NHRDA event racing in a class where you can actually make 1,000$ or more hell in Phoenix Rob made $3,000. The DPC is simply bragging rights with not many fans being able to watch. If I were to grenade my truck at least it would be in front of a few thousand people?
 
WanaDmaxsub

WanaDmaxsub

Junior Member W/gray hair
Feb 17, 2007
644
1
18
At this point I think the "appeal" may be more for the builders/shops than the truck owners. Bragging rights for a builder/shop could bring in big $$$$$$'s.

Maybe they should have event specific winners and an over all winner (all receiving the same recognition). The event would turn into several more days...but they would/could draw 5x's the # of trucks they have now.

JMHO
 
Iceman56

Iceman56

New member
Jan 19, 2009
867
0
0
Madison, SD
Subman said:
These built motors definetly have a short life at WOT, I don't care who builds them. We have scattered three engines and all were built with the hopes of them lasting 20 minutes at WOT, only one made it. DPC is brutal on these trucks, I'm surprised any of them survived especially in Denver. Bad enough on a lighter drag truck, totally crazy on a truck that has to survive all of those different events set up with the same tires. To be honest the DPC is totally losing its appeal and my interest. I didn't know it had been run or that it was in Denver till I saw this thread. I think it need a reality check and total rework to get back to what was intended when they started.
Click to expand...

X3 I thought it was started more for the hot Daily drivers, and to show how versitile these truck can be
 
Mike L.

Mike L.

Got Sheep?
Staff member
Vendor/Sponsor
Aug 12, 2006
15,681
232
63
Fullerton CA
WanaDmaxsub said:
At this point I think the "appeal" may be more for the builders/shops than the truck owners. Bragging rights for a builder/shop could bring in big $$$$$$'s.

Maybe they should have event specific winners and an over all winner (all receiving the same recognition). The event would turn into several more days...but they would/could draw 5x's the # of trucks they have now.

JMHO
Click to expand...

Lawrence
We don't get much recognition for these kind of events. I built Dimitris last year and he won. few people know or care whos trans it was. I get a lot of recognition for street truck transmissions. That's what counts. Few people will ever get a trans like the special ones that are built for these events. You can't put a price tag on the time it takes to special build one. It's a pain in the ass.
 
boss760

boss760

New member
Mar 8, 2010
72
0
0
Clarkrange, TN
I am not sure what is going with everyones motors, but we had a good motor. Our motor did not fail from high hp. We just had a little nitrous malfunction. Looking backs I wish we had left the nx at home. We would have done well without it. Thanks to everyone sporting us. Wish we could have done well for the duramax team. It was a mean truck on the street, and didn't seem to mind the elevation. Like Branden said, don't worry about our motor. We will take care of it. Thanks to everyone. Owen Horst
 
bigbird

bigbird

Member
Sep 18, 2006
837
0
16
Edmonton, Alberta, Canada
paint94979 said:
Ya I don't see some peoples obsession with destroying your engine/transmission/retirement fund on competing in the DPC... IMHO its one thing driving 10hrs to an NHRDA event racing in a class where you can actually make 1,000$ or more hell in Phoenix Rob made $3,000. The DPC is simply bragging rights with not many fans being able to watch. If I were to grenade my truck at least it would be in front of a few thousand people?
Click to expand...

That's why I turned down the invitation. it's an interesting thing the magazines have going on. They give you the oportunity to pay all your travel expenses so that you get a chance to blow all your sh!t up so they can sell copies of their mag. If things go well you're only out the travel expenses.
 
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