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Old 12-19-2005, 01:01 AM   #11 (permalink)
DURAtotheMAX
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I think if the block was the same and the engines were 100% identical, the RPO code would be the same...I mean it makes sense doesnt it? There must be some "significant" change in the engine that we are not seeing...otherwise the RPO code woudlnt have changed. The RPO code didnt change in 2004.5 to 2005 when the software was revised to give an extra 15 ft lbs of torque...

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Old 12-19-2005, 01:01 AM   #12 (permalink)
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I think if the block was the same and the engines were 100% identical, the RPO code would be the same...I mean it makes sense doesnt it? There must be some "significant" change in the engine that we are not seeing...otherwise the RPO code woudlnt have changed. The RPO code didnt change in 2004.5 to 2005 when the software was revised to give an extra 15 ft lbs of torque...

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Old 12-19-2005, 02:17 AM   #13 (permalink)
socaldieseltech
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Quote:
Originally Posted by RichLockyer View Post
The LLY does indeed have the reduced compression.

The block? No clue really... trying to get casting numbers from people. I don't know where to look on mine.


But....

Logically.... the LLY remain in 310hp form for the H1 and some other vehicles, the LLY remains, detuned to 250hp for the vans.
Why would GM build two different blocks?

OTOH, the head is where the reduced compression comes from, but other improvements are thicker rods and a heavier wristpin. No way of knowing if the LLY has those without a teardown until someone is able to pull up the fische for the '06 models.
The head is where the reduced compression comes from? LOL, elaborate, please.
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Old 12-19-2005, 02:30 AM   #14 (permalink)
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Quote:
Originally Posted by socaldieseltech View Post
The head is where the reduced compression comes from? LOL, elaborate, please.
Larger chamber.
You can change compression by reducing stroke, or by enlarging the chamber, either with the head or by dishing the piston.
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Old 12-19-2005, 02:37 AM   #15 (permalink)
socaldieseltech
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There is no chamber in a dmax head.
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Old 12-19-2005, 02:41 AM   #16 (permalink)
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Quote:
Originally Posted by socaldieseltech View Post
There is no chamber in a dmax head.
Hmm.....
So.... does that mean that the LLY does indeed have the same pistons/rods as the LBZ? The bore and stroke are the same, as is the compression.

No chamber? What about valve, glo-plug, and injector clearance?
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Old 12-19-2005, 02:42 AM   #17 (permalink)
socaldieseltech
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Well you're the one who said the difference is in the head.
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Old 12-19-2005, 02:43 AM   #18 (permalink)
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Ya.... going by my experience with gassers
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Old 12-19-2005, 02:47 AM   #19 (permalink)
socaldieseltech
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Quote:
Originally Posted by RichLockyer View Post
Hmm.....
So.... does that mean that the LLY does indeed have the same pistons/rods as the LBZ? The bore and stroke are the same, as is the compression.

No chamber? What about valve, glo-plug, and injector clearance?
Again, there is no chamber in the head. What about the clearance? Dude the freakin head is about as flat as it could possibly be. The injector sprays into a combustion chamber in the piston. I have an LBZ piston and rod on the way so that I can note the differences.
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Old 12-19-2005, 02:49 AM   #20 (permalink)
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Originally Posted by RichLockyer View Post
Ya.... going by my experience with gassers
I can't think of any diesel engines off hand that have a combustion chamber in the head, at least a dome, or hemi shaped combustion chamber. Although some do have a pre-combustion chamber in the head, the head still looks flat.

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