smoked me a duramax today!!!!!!!

[My 6 Eats V8's Old File]

alright guys I heard from a reliable source that the dd truck already has a new set of heads on it now. I guess it couldn't handle the heat. #ad

 

[Pete Peterson]

The Duramax's don't seem to be selling around here that well, dealers had the same one on the lot for over a month. Only one that I know of in town and its a dually. Pete

 

[RacerGreen]

Originally posted by Steve Roseman:

We all have cast blocks, but the Duramax has aluminum heads and the Cummins has a cast head. The aluminum does dissipate heat better than cast, but it also distorts easier under temp extremes.
The problem is the difference in metals, cast block aluminum heads. They expand and contract at different rates, making it hard for the head gasket to do it's job. That's why so many of the newer cars blow head gaskets.
Just wait till those Duramax's have 100k on them, unless they change their coolant every 30k and use distilled water, they'll be blowing gaskets.


thanks steve, thats exactly the point i was trying to make. i know that we all have cast blocks but we dont all have aluminum heads which makes the cummins more reliable,i see the chevy boys changing their head gaskets frequently lmao thanks again steve

 

[Big_DQ]

I also was given the pleasure of having a Duramax want to show ME who was Boss. He made the mistake of trying it from 70MPH. After being shown who was boss, he Hastily exited the interstate #ad
#ad
#ad

Don

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96 2500 4x4 5spd 3. 54 grs, #10 TST plate(plate and housing slid all the way forward), AFC spring kit(light spring), Holset H2E-17cm turbo, CUSTOM 4" exhaust With 5" stacks, Custom air induction system With NAPA 2948 cylindrical filter, Banks Twin Ram intake manifold, ATS three piece exhaust manifold, TST guages, 370HP injectors, 3800 rpm governor spring kit, BD's High Flow delivery valves, "Accidently" modified fueling curve, Slightly advanced timing(17. 5deg. ) Modified valve lash, 60# valve springs,Powershot 2000 propane injection system, Mcleod dual disc clutch(street), Lockright lockers front and rear, Rancho traction bars, 315-75R16 Durango AT's on American Eagle 16x8 wheels for street use, 33-12. 50-16. 5 Denman Groundhawgs on 16. 5x9. 75 American Eagle wheels for pulling, Linex liner and rocker panels,

 

[SlyBones]

Big_DQ,

Ever get that thing dyno'd? Give us the scoop!

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1997 2500 4x4, CC, Auto, 3. 54 LSD, 66K, Everything inc Leather, K&N, 4" BD cat-back, otherwise stock, Isspro Gauges(3), 285/75/16 on Alcola's, Canopy, BedLiner, and tons more.

 

[joesoot]

Big DQ-
You smoked him, that's a given... what I wanna know is how bad?

 

[Mr.B]

I don't know what you people keep talking about in this thread. I am reading things like, "the cummins has a cast head and the chevy is aluminum. " You can cast anything, plastic, bronze, aluminum, iron etc. Both trucks have a cast block and heads. One has cast aluminum heads and the other has a cast iron head. They both have cast iron blocks. The reason the chevy has a higher compression ratio is because it's heads dissipates heat quicker, so they bumped up the compression to make up for the lost heat needed in the diesel combustion process. So the iron head would be more efficient because it retains its heat but the biggest reason of using aluminum heads on the chevy is weight reduction.

 

[Big_DQ]

SlyBones, I have never dyno'd it as I am not done with the building process yet. Don't seem to have a dyno around these parts either.
Joesoot, From my perspective, it looked like he put it in park. Of course that was in the split second before I lost him in the cloud of black smoke. By the way I had my propane system disconnected because I can't bring myself to drill a hole in the new Twinram manifold yet.

 

[Missouri Mule]

Thanks Steve for un-confusing me momentarily forgot about different heating/cooling factors of the two metals.
RacerGreen exactly what was on my mind. I knew there was a link to the vega and the duramax: distorted heads from high temps.
Of course we all know that duramaxes won't get high EGTs because how they programed the allison trans.
I wonder if GM can regulate the manual trans like they do the auto so duramaxes won't melt done with a manual?

 

[Tom C]

Big_DQ, wow, you gotta be pushing some major power there. i'm curious as to your 0-60 and 1/4 mile times.

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2001. 5 2500 4X4, QC, Auto, 3. 54 LSD, SLT, SWB, Trailer, Camper & Snow plow Packages, White, 35k# Cody Hitch, 20' Gooseneck Lowboy flat-bed Trailer.

 

[DSiemens]

Theres only the auto in the GM's. They don't have a manual for them yet is what I've heard. A six speed wil be availble in the future, but did not say when.

 

[Steve Roseman]

Originally posted by Mr. B:
I don't know what you people keep talking about in this thread. I am reading things like, "the cummins has a cast head and the chevy is aluminum. " You can cast anything, plastic, bronze, aluminum, iron etc. Both trucks have a cast block and heads. One has cast aluminum heads and the other has a cast iron head. They both have cast iron blocks. The reason the chevy has a higher compression ratio is because it's heads dissipates heat quicker, so they bumped up the compression to make up for the lost heat needed in the diesel combustion process. So the iron head would be more efficient because it retains its heat but the biggest reason of using aluminum heads on the chevy is weight reduction.

Mr. B,
No doubt you are 100 percent correct. It is a common oversight to refer to cast iron as "cast" and cast aluminum as "aluminum". I do feel the cast "iron" heads are a more durable choice, albeit maybe not as effecient with weight.


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'95 2500 Ext. Cab, 2wd 3. 54 limited slip, auto, TST 230/605 plate, TST low stall T. C. , K&N air filter.

[This message has been edited by Steve Roseman (edited 03-11-2001). ]