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.

Very sorry to hear that man, hope you get it fixed soon and back on the track.

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

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.

Yeah, I'd say Casper has been through the mill WAY MORE than most. No offense Pat.:)

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.

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

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

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!

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

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.

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!

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!

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.

Poor Girl, sounds like she just kinda gave up the Ol' ghost..:angel:

Poor Boy, sounds like he just kinda gave up the Ol' ghost..:angel:

Fixed it for ya ):h

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.

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

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?

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.

I still say that once a second CP3 goes on without stronger rods, you life span is limited, but your sure got some good use out of that block:D , I liked reading about what you did with a stock motor, and can hardly wait to see what you do with a built one:D

are you going to be rebuilding the old motor for a spare? :D

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?

We are building an engine with the tech support of Guy Tripp at SoCalDiesel, the goal is reliable operation at a given HP level, and will monitor the engine on a routine basis.

The GT42R provides plenty of air at this point and did not exhibit boost fade at all going through the traps at 3500rpm. It is EPA Clean Air Approved at 750HP, and needs more fuel. :D

RIP Casper, I will miss you, but I can't wait to see the debut of casper on engine #2, which is #2 only hopefully. I think its the gaskets, just because the head bolts were stock, and you were running 59 psi. I am striving for the point were a stock engine would last for two runs and a drive home. :)

I will be surprised if it's a head gasket, normally they won't lose that much compression, but I suppose it's possible.

I think we should have a moment of silence, and maybe someone could say a few nice words. Nate

RIP Casper. Dont take it to heart Pat, Casper died an honorable death. And, if it makes you feel any better, Anna Nicole Smith died too, with a few more drugs ran through her and a bunch more miles.

And, if it makes you feel any better, Anna Nicole Smith died too, with a few more drugs ran through her and a bunch more miles.


That just ain't right, right there.):h

I need to reinterate that this thread was posted prematurely. I was going to wait until we found out what failed before posting just in case it is just a pushed injector or blown headgasket.

what a hard life! how long did it have 2cp3's on? sounds like if done/used right, a motor could last a desent time on one pump

I think smith had a much rougher life than casper did. I still can't believe your motor lasted that long at 59 psi of boost thats insane

Thank you for sharing. I love reading about what this truck has done and look forward to seeing what it will do in the future!

Sounds like you shortened some rods there Pat.

No misfire codes.
How about injector balance rates? I'm just curios if this was an injector induced failure or a good old-fashioned beatin failure?:D

I am sure Anna was rode harder and more often than casper, but casper had a better quality of life.:D
Nate

How about injector balance rates? I'm just curios if this was an injector induced failure or a good old-fashioned beatin failure?:D

Dunno yet. I wanted to work on the truck more, but it was my son's birthday. I was going to look everything over this weekend and post about it, but false rumors and insults were flying so I posted this thread to squash the potty mouths.

Guess I will have egg on my face if it's something simple. :(

I am sure Anna was rode harder and more often than casper, but casper had a better quality of life.:D
Nate

Yeah, too bad Casper won't get $400 million for sucking a rod...

:D

It sure was a fun ride to read about?More to come hopefully!

Yeah, too bad Casper won't get $400 million for sucking a rod...

:D

:lol:

Dunno yet. I wanted to work on the truck more, but it was my son's birthday. I was going to look everything over this weekend and post about it, but false rumors and insults were flying so I posted this thread to squash the potty mouths.

Guess I will have egg on my face if it's something simple. :(

I hope it is something simple so casper can continue it's thrash fest on the stock bottom end.:)

BTW,PM sent Pat.

Thanks for testing the stock Duramax Engine........I think you surpassed 400 RWHP on Stock internals a while back...........:eek:

I am surprised it lasted as long as it did as well.

Good Luck,

:cool:

Good work Pat...she did pretty good for a long time.

nice job pat:thumb: im eager too see waht the next chapter brings :bounce:

I guess it's time for a heart transplant for casper. Sorry to hear that, but atleast it didn't scatter 100 miles from home or anything like that.

Hate when THAT happens. BTDT :)

sad to hear your luck pat.... now thats why you were a bit crabby on the phone, lol

Hate when THAT happens. BTDT :)


I remember that too.:lol2:



Good luck to both of you on your rebuilds, and your information sharing has been priceless to the Duramax "family"

:( Sorry to hear about Casper, but I'm sure the next one will be greater!

RIP Casper. Dont take it to heart Pat, Casper died an honorable death. And, if it makes you feel any better, Anna Nicole Smith died too, with a few more drugs ran through her and a bunch more miles.


:beerchug: :funnypost

RIP Casper. Dont take it to heart Pat, Casper died an honorable death. And, if it makes you feel any better, Anna Nicole Smith died too, with a few more drugs ran through her and a bunch more miles.
That's too funny, I just spit water all over my keyboard :D

I guess its time to pay for your play, That sux man . Time to bring casper back from the dead... so to speak.. Looks like we'll have more performance threads to read in the future:naughty:

Pat/kat, what you do (I think) is respected by alot more people than you know.
RIP Casper, we will learn and hope that we will go in the same way...doing what we love.

Even if you are a Lilly;)

Have you had a chance to check it out anymore yet Pat?

Have you had a chance to check it out anymore yet Pat?

Nope.. Someone keeps giving him more "Honey Do" things :rolleyes: ):h

I would love to know just what went wrong.. and the ways to overcome it.

I would love to know just what went wrong.. and the ways to overcome it.

Leave your truck stock. :D

How many miles on this motor and truck? Just wondering..

Jason

he had something like 11000 on his odometer mostly 1/4 mile passes and dyno runs

k thanks.

Jason

Nothing worse than damaging a high HP engine when you are not running it hard. I dropped a valve on the way to work on my big block. Always wanted it to go in a blaze of glory but that didn't happen.

Leave your truck stock. :D

Easier said than done;)

dont get the wrong idea on this thread. Pat & Kat pushed Casper really hard in his short life and giving us the data that they found. Pat really pushed the envelope on an internally stock engine.

That sucks, do you think that the engine could have held 750 relatively safely if it wasn't driven so hard. Sure hope you get casper fixed I really loved reading about it.

Sure hope you get casper fixed I really loved reading about it.

Casper will be fixed real soon :cool:

We drag race... That is what we do fun together.

I hope the new and improved casper, with hopefully over 800hp can come to the super chevy show in march, to rain on their party.

You cant expect a engine to run more than 7or8 hours on 700+rwhp motor. About 4-5 weeks ago I ordered GT42R, Dual Fueler and a bunch of other goody's for my LBZ project and almost put it in without internals. I didn't have the money for the internals then, but realized sooner than later the responsible safe play is wait. It would be devastating to blow a Rod and have to get a new motor or deal with serious rebuild/$$$. So unlike most I waited to recieve my paycheck this week and will purchase Rod's, Camshaft, Spring's and Retainer's. I feel like I just bought insurance on my 800+hp tuck):h . Heck what do I know, this is my first Race Truck and I'm still a youngster:D. It was sure fun though following Casper's trail's he had me shocked:eek: . Now let's see how long a built motor last's with this kind of abuse.:cool:

Any developments?

You cant expect a engine to run more than 7or8 hours on 700+rwhp motor. About 4-5 weeks ago I ordered GT42R, Dual Fueler and a bunch of other goody's for my LBZ project and almost put it in without internals. I didn't have the money for the internals then, but realized sooner than later the responsible safe play is wait. It would be devastating to blow a Rod and have to get a new motor or deal with serious rebuild/$$$. So unlike most I waited to recieve my paycheck this week and will purchase Rod's, Camshaft, Spring's and Retainer's. I feel like I just bought insurance on my 800+hp tuck):h . Heck what do I know, this is my first Race Truck and I'm still a youngster:D. It was sure fun though following Casper's trail's he had me shocked:eek: . Now let's see how long a built motor last's with this kind of abuse.:cool:

Damn....only 7-8hrs on a 700whp truck? This diesel stuff is crazy expensive man......

Any developments?

We are waiting for a couple of small parts :(

Damn....only 7-8hrs on a 700whp truck? This diesel stuff is crazy expensive man......
I know. Going on Ramen Noodle's for like the third Month-:t .

Sounds like it......damn. Anyone want to sponsor me for tires in a WRX? They're only like 800 bucks a weekend...I'll put your name on the side and it's gonna run on Speed Channel in the World Challenge touring car series:) :D :)

i thought mcrat was taking casper in for warranty work engine failure with only 10000ish miles:D