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duramax in a k5?

FightinTXag said:
It takes some doing (lower compression, higher turbo pressures, and an intercooler) but hp in the mid 300s and torque around 500 ft-lbs is possible for a 6.5TD. Peninsular sells a 340hp version. That would be on par with a duramax in stock form.
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id be happy with 300hp/500tq. how would lower compression help power? boost plus compression=power...? what kind of aftermarket is there for a 6.5? also, what tranny is the m1008? im not up on the code things yet..:D
 
Ummmm, thats like 10,600 for an engine. And you provide the core.

I think I'll pass.

Tranny in the 1008 is a th400.
 
i think what he meant was torque. ppl tend to confuse power with torque at least around here they do. the dmax will have a great bottom end and power curve abd he would suck twice as much with a 502. also not sure on weights so im gonna make an assumptiona and say that the dmas is gonna weigh alot more
 
ryan22re said:
Ummmm, thats like 10,600 for an engine. And you provide the core.

I think I'll pass.

Tranny in the 1008 is a th400.
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yeah.. thats rediculious, and i was planning on using a 400 anyway :laugh:
 
87 Blue Beast said:
^^ i figured that from what ive been hearing. im thinkin im either goina look for a decently prived duramax or building the hell out of a 6.5 turbo. what would a dmax/allison combo run? probably a purty penny..:confused:
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The 6.5 is a bored out 6.2 with an electronic injection pump and a turbo...same engine, bumped up displacement....
 
how would lower compression help power?
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The 6.5L originally came with a 21.3:1 compression ratio and had about 7-8 psi of boost in stock form. There is a limit to the pressure you can squeeze in the combustion chamber while expecting the engine to last. So in order to run significantly more boost you have to lower the compression ratio. 18:1 pistons are available and allow the 6.5 to run with 15psi or so (and cost around $900).

For comparison the Duramax compression ratio is 16.8:1 or 17.5:1 depending on the model and has about 20psi of boost. Chipped Duramaxes pushing out 400+hp will see boost up to around 28 psi or so.

The 6.5 is a bored out 6.2 with an electronic injection pump and a turbo...same engine, bumped up displacement....
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Well they had different heads, and only the very last 6.2's could be bored to the 6.5. Also only 94+ 6.5s received electronic injection pumps. But basically, you're right. The 6.5L was not a clean sheet design by any means.
 
what kind of compression would a stock 6.2 run? how much p.s.i could you push out of one stock without it going boom. i may be getting a 6.2 but i want about 300/500. is it possible? for cheap? what kind of compression would you need to have. if i ran a 9.5/1 compression and like 25 p.s.i would that work. or is this too low
 
dreadstealth said:
what kind of compression would a stock 6.2 run? how much p.s.i could you push out of one stock without it going boom. i may be getting a 6.2 but i want about 300/500. is it possible? for cheap? what kind of compression would you need to have. if i ran a 9.5/1 compression and like 25 p.s.i would that work. or is this too low
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You would not be able to ignite diesel under normal circumstances with 9.5/1 compression. I would not push a 6.2 above 20 psi....the heads, head gaskets, and pistons were not designed for a turbo application. 300 hp /500 ft lbs tq is not cheap nor easy to get...you can't just bolt on a new turbo and go, or even just lower comp pistons and a turbo cranking out that much boost. You would need your deck/head surfaces cherry, with a perfect seal, you would need to swap out to 6.5 nozzles (injectors to most people), and depending on the year, probably would want to swap out your precombustion chambers for 6.5 units, they will allow you to build much more power because of the shape of the opening. Stock 6.2's are approx 21.5:1 compression by the way. I would say 250/400 is a more comfortable goal for these engines, you will probably also want to upgrade to a gear drive timing setup ($$$), and some sort of main girdle setup or machine your block to accept splayed caps.

As you can see, this is why I'm happy with my N/A 6.2....I don't have to worry about all this, I've still got about 170 hp and 280 ft lbs of tq with the upgrades I made, and I don't have to worry about exceeding the limits of my engine, and it still moves my blazer just as fast as it needs to go...
 
I wonder if that guy had to ditch the turbo and intercooler to fit the Dmax. I sure didn't hear it spool up.
 
FightinTXag said:
I wonder if that guy had to ditch the turbo and intercooler to fit the Dmax. I sure didn't hear it spool up.
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Nope. Turbo and intercooler are still there. ALOT of custom work was done to get the intercooler to fit, but its still there. iTs got an aftermarket turbo on it, too along with a dual CP3 kit from PPE.

Scott
 
mstockton said:
You would not be able to ignite diesel under normal circumstances with 9.5/1 compression. I would not push a 6.2 above 20 psi....the heads, head gaskets, and pistons were not designed for a turbo application. 300 hp /500 ft lbs tq is not cheap nor easy to get...you can't just bolt on a new turbo and go, or even just lower comp pistons and a turbo cranking out that much boost. You would need your deck/head surfaces cherry, with a perfect seal, you would need to swap out to 6.5 nozzles (injectors to most people), and depending on the year, probably would want to swap out your precombustion chambers for 6.5 units, they will allow you to build much more power because of the shape of the opening. Stock 6.2's are approx 21.5:1 compression by the way. I would say 250/400 is a more comfortable goal for these engines, you will probably also want to upgrade to a gear drive timing setup ($$$), and some sort of main girdle setup or machine your block to accept splayed caps.

As you can see, this is why I'm happy with my N/A 6.2....I don't have to worry about all this, I've still got about 170 hp and 280 ft lbs of tq with the upgrades I made, and I don't have to worry about exceeding the limits of my engine, and it still moves my blazer just as fast as it needs to go...
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I plan on a fairly small turbo on my 6.2 - no more than 6PSI or so. The main purpose is to maintain power with increasing altitude. In stock NA form the motor I have was rated at 165HP, which is pretty decent for a NA diesel. 5 PSI intercooled boost should get it to around 200HP and 380lb/ft torque. That should move my K5 around just fine while getting decent fuel economy.

I may end up tossing the motor in NA and adding the turbo later. Hooking up my current gasser exhausr to the diesel would be a simple hack, and it would save me a grand. Then I can play with it for a while before deciding on the turbo :thinking:
 
MaxPF said:
I plan on a fairly small turbo on my 6.2 - no more than 6PSI or so. The main purpose is to maintain power with increasing altitude. In stock NA form the motor I have was rated at 165HP, which is pretty decent for a NA diesel. 5 PSI intercooled boost should get it to around 200HP and 380lb/ft torque. That should move my K5 around just fine while getting decent fuel economy.

I may end up tossing the motor in NA and adding the turbo later. Hooking up my current gasser exhausr to the diesel would be a simple hack, and it would save me a grand. Then I can play with it for a while before deciding on the turbo :thinking:
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Thats what I did!

-Martin
 
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