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6.5 diesel lowering compression ratio

that's a pretty tough # to come up with. Some blocks are just better than others and I'm not talking certain block #s. Seems to be hit and miss thru out all block #s. If you have a good high mileage block and it's not cracked I would probably stay under 25
 
ak diesel driver said:
that's a pretty tough # to come up with. Some blocks are just better than others and I'm not talking certain block #s. Seems to be hit and miss thru out all block #s. If you have a good high mileage block and it's not cracked I would probably stay under 25
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well lets say i bought a new updated block and i used a intercooler
 
if you bought an optimiser block and not a chinese knockoff I'd guess 25 with thin headgaskets maybe a little more
 
ak diesel driver said:
if you bought an optimiser block and not a chinese knockoff I'd guess 25 with thin headgaskets maybe a little more
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thats what i figured see my dad gave me a military 6.2 and the whole top half is brand new 6.5 parts about 4500 dollars worth of parts new, the heads are aftermarket and much thicker ,what im wanting to do is get rid of the old 6.2 block and upgrade to a matching 6.5 block ,because we all know that the 6.5 has heat treated pistons and a better crank, im wanting to put twin turbos and a inter cooler on this set up after i get done lowering the compression and more mods to the engine ,im wanting to get it to at least 375 horse power with a ass ton of torq
an e
 
what turbos are you looking at? we have a member here who put together a twin turbo setup with two GM x series turbos. as long as you keep the drive pressure down 25 psi should be fine.
 
My new Optimizer 6500 is rated at 25 psi sustained.

Mine is a stock 20:1.

That's what I got from GEP when I inquired.

How much will it take maxed?

Dunno, only one way to find out and I'm not up for tryin' cause it usually leads to cryin'.

You might get more into and 18:1, you might not. Limiting factor is the head gaskets and the head bolt arrangement.

I run a 13 psi max and I have to have my foot in towing our 35 foot TT to hit that.

I'm usually down around 5-ish on the highway unloaded.

An intercooler/WMI makes no difference to how much it can handle.

30 psi is 30 psi, intercooler or not.

Chasing high boost numbers is fairly pointless unless you can wick up the fuel delivery also....then you need to start beefing up the cooling system.....and then you......well, you get the idea....;)
 
great white said:
My new Optimizer 6500 is rated at 25 psi sustained.

Mine is a stock 20:1.

That's what I got from GEP when I inquired.

How much will it take maxed?

Dunno, only one way to find out and I'm not up for tryin' cause it usually leads to cryin'.

You might get more into and 18:1, you might not. Limiting factor is the head gaskets and the head bolt arrangement.

I run a 13 psi max and I have to have my foot in towing our 35 foot TT to hit that.

I'm usually down around 5-ish on the highway unloaded.

An intercooler/WMI makes no difference to how much it can handle.

30 psi is 30 psi, intercooler or not.

Chasing high boost numbers is fairly pointless unless you can wick up the fuel delivery also....then you need to start beefing up the cooling system.....and then you......well, you get the idea....;)
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fuel is all ready turned up mane lol
 
might want to check out NMB2s build over on PSN he's got a db2/db4 hybrid pump supposed to be putting out 300+cc
 
RobZombie is pushing between 25 - 30 psi with his stock N/A Optimizer. I would say it probably has quite a bit to do with how the boost is delivered... I wouldn't want to do it with a GMx turbo that's for sure and wouldn't do it without all the supporting mods either.

Mike
 
Mike K3500 said:
RobZombie is pushing between 25 - 30 psi with his stock N/A Optimizer. I would say it probably has quite a bit to do with how the boost is delivered... I wouldn't want to do it with a GMx turbo that's for sure and wouldn't do it without all the supporting mods either.

Mike[/QUOTE

i been looking at these cummins turbos ,if i could set the waste gates on these to blow off at 15 psi pur turbo these would be perfect for what i want

http://www.ebay.com/itm/Dodge-Ram-T...Truck_Parts_Accessories&vxp=mtr#ht_5155wt_952
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