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Discussion Starter · #1 ·
Our 2005 LLY Dmax "Casper" might have lost a cylinder.

It didn't even happen while driving. Kat drove it, it ran fine. I went to drive it and it wouldn't start at first. I finally got it to start and it idled rough and was smoking white (diesel fuel, STRONG).

I just did a compression test on 6 of 8 cylinders (you can't get #4,#8 with my gauge), and the cylinders were between 295-320PSI except number 3 which was 240. It was a crappy gauge (Mity Vac?), so I need to do it again with a better tool. RickDLance pointed me in the direction of a better gauge.

There are 5 "normal" types of dead cylinders:

Head gasket (it's not using water)
Rod bent
Piston cracked (surprisingly little PCV blowoff)
Injector pushed out of bore (will replace clamp and retest)
Bad valve (rare)

Shortly after California Speedway with the GT42R (119mph pass) it started to make a little white smoke on start, and took longer to crank. We ran it at LACR with no problems except a blown intercooler hose (120.4 mph) and dyno'd it 755rwhp, 1360? TQ.

It ran excellent up until now except for the warm up smoke and the 3 second crank cycles.

The GT42R runs 75 deg hotter EGT's (1625 through lights), makes 80 more RWHP, and runs far higher boost 42 vs. 59 PSI.

Did boost do it? Did HP do it? Did TQ do it? Did EGT's do it? Did it's short brutal life do it?

Not sure.

Since we are taking the engine out in about 2 weeks to put the new one in, I'm not going to tear into it right now, well, except to perhaps replace the injector hold down on #3.

My theory that we would be immune to engine failure if we just ran fuel is probably not true.

I will do the autopsy to find out why, but I felt I must warn those of you running (or contemplating) big #2 HP of my experience.

Well, at least I probably didn't wreck the cores. Good night Engine #1, you were alot of fun, and will be missed.
 

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is that a warranty issue:rolleyes: .casper has been abused took it like a big boy though.
 

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Discussion Starter · #4 ·
PS - Someone is spreading a rumor that Casper is on it's second engine. This is not true. It had the oil pump fall apart at 3000+ RPM and 42PSI and go instantly to zero oil pressure. It creamed the charger, but the engine was was not replaced, just the oil pump.

The engine has over 250 (way over) 1/4 passes, a few sled pulls, hundreds of dyno pulls, several bottles of nitrous, 14 turbochargers, and perhaps 200 different tunes run on it. It just kept getting meaner until it took Kat home safely, and layed down to rest.
 

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Discussion Starter · #6 ·
GMC2500HD;1580100; said:
Very sorry to hear that man, hope you get it fixed soon and back on the track.
We've been working on a new engine for it for a couple of months. Should be up and running very shortly.
 

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Sorry to hear that Pat.

Seems you were kind of looking forward to this in a demented sort of way.:D

Thanks for the testing and letting us know the limits. Keep us informed, hope it's something easy
 

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Sorry for your loss Pat.:( They always run really great right before they go. I cannot wait to see the new engine run.
 

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Sorry to hear it but at least there is a new engine on the horizon!

What kills me is that "Casper" has probably had a harder life than any one of our trucks and probably has the least miles! LOL (I think I remember reading somewhere that it had pretty low miles! Cant rack 'em up that fast if it's only .25 mile at a time! LOL)

Good luck with engine #2, cant wait to see more from You and "Casper" in the future!
 

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RIP..Caspers first engine will be missed greatly:)
Now its time to really put a hurtin on those dodges
 

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Discussion Starter · #11 ·
IdahoRob;1580128; said:
Sorry to hear that Pat.

Seems you were kind of looking forward to this in a demented sort of way.:D

Thanks for the testing and letting us know the limits. Keep us informed, hope it's something easy
When the oil pressure went to zero, we thought that was it, and assumed it would blow any minute, but we kept dialing it up anyhow. :D

In a way, I'm glad we took it to the point of injury before replacing it. If it would have lasted another couple weeks we would have taken it out anyways, and if there was no injury, I would have assumed 750hp is safe.
 

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McRat;1580154; said:
In a way, I'm glad we took it to the point of injury before replacing it. If it would have lasted another couple weeks we would have taken it out anyways, and if there was no injury, I would have assumed 750hp is safe.
If that's not a "glass 1/2 FULL" statement, I dont know what is! We could only be so lucky to have a member on here that is happy that his truck broke early enough for him to learn something! LOL Thanks Pat!
 

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Thanks for sharing the info Pat.. These stock motors will never live forever at those HP #'s but it lasted longer than I had guessed.. Good luck on the new motor!
 

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Thanks from all us wannabes out here too. We see you and strive to follow in your shadow. ;) Keep rocking, and sorry for your loss.
 

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SaguaroKid;1580493; said:
Poor Boy, sounds like he just kinda gave up the Ol' ghost..:angel:
Fixed it for ya ):h
 

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Pat,did you check for a misfire code? That's how I found #8 piston was cracked on my truck. Same symptoms your having,white smoke,rough idle,very little blow by,ect. Seems like I had an injector sticking causing too much fuel to be injected into one cylinder.
 

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I'm optamistic, I think hes just got the flu. I hope its something little that can be easy to fix
 

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What are your plans for the new motor? Of course rods and heads, but are you going to keep the gt42r on him and just try and add some more fuel?
 

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Discussion Starter · #20 ·
BIGBLOCKBILL;1580578; said:
Pat,did you check for a misfire code? That's how I found #8 piston was cracked on my truck. Same symptoms your having,white smoke,rough idle,very little blow by,ect. Seems like I had an injector sticking causing too much fuel to be injected into one cylinder.
No misfire codes.
 
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