6.7 Twin Turbo Setup

Black AOD · Mar 5, 2015

WhiteMamba_Scorpion said:
I blame Canada

yep! :whs:

Bustedknuckles · Mar 5, 2015

97stoker350 said:
Just thinking out loud but high cylinder pressure puts a lot of strain on the bottom end components. So if the crank isn't flexing and the rods aren't bent that leaves one thing... Rod bearings

Bearing failure as quick as he is seeing almost has to be a oiling issue unless the cylinder pressures where just insane.

PDT1081 · Mar 5, 2015

Bustedknuckles said:
Bearing failure as quick as he is seeing almost has to be a oiling issue unless the cylinder pressures where just insane.

Oiling issue, improper machining, improper installation.....

Bustedknuckles · Mar 5, 2015

PDT1081 said:
Oiling issue, improper machining, improper installation.....

Both those last 2 would have been triple checked by the last 2 builders I'm sure. The CFD motor lasted a lot longer than any of these, obviously not at the same hp level but still! One of the reasons I really want to know the cause....

Morgan@Midwest Diesel & Auto · Mar 5, 2015

97stoker350 said:
Just thinking out loud but high cylinder pressure puts a lot of strain on the bottom end components. So if the crank isn't flexing and the rods aren't bent that leaves one thing... Rod bearings

Bustedknuckles said:
Bearing failure as quick as he is seeing almost has to be a oiling issue unless the cylinder pressures where just insane.

Did anyone see the glow plugs......? If glow plugs were blowing out, what do you think....

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Dan · Mar 5, 2015

The gtx4202 has a 1.0 a/r housing and the 55 has a 1.32 a/r and a fairly big gate around the small turbo.. another thing I'll throw out there is that blue custom auto truck has put down way bigger numbers than I have with 3" holes in that bed side exhaust.. without rod bearing issue

Breaking Habits · Mar 5, 2015

Dan said:
The gtx4202 has a 1.0 a/r housing and the 55 has a 1.32 a/r and a fairly big gate around the small turbo.. another thing I'll throw out there is that blue custom auto truck has put down way bigger numbers than I have with 3" holes in that bed side exhaust.. without rod bearing issue

And the exhaust is post turbo. Backpressure after the charger does not matter, especially that far down stream

Bustedknuckles · Mar 5, 2015

Dan said:
The gtx4202 has a 1.0 a/r housing and the 55 has a 1.32 a/r and a fairly big gate around the small turbo.. another thing I'll throw out there is that blue custom auto truck has put down way bigger numbers than I have with 3" holes in that bed side exhaust.. without rod bearing issue

So its a drive pressure issue for sure, not a oiling issue?

Vader's Fury · Mar 5, 2015

Those turbo housings are big enough and with a gate around the 4202 I doubt he is having bp issues. My money is on cp.

Morgan@Midwest Diesel & Auto · Mar 5, 2015

No, it's not back pressure. Cylinder pressure>back pressure on any internal combustion engine. Talking thousands of psi vs less than a 100.

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4EverBoosted1 · Mar 5, 2015

Morgan@Midwest Diesel & Auto said:
No, it's not back pressure. Cylinder pressure>back pressure on any internal combustion engine. Talking thousands of psi vs less than a 100.

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But why would he be having such high cylinder pressure?

Bustedknuckles · Mar 5, 2015

4EverBoosted1 said:
But why would he be having such high cylinder pressure?

Too much timing can cause it.

97stoker350 · Mar 5, 2015

I wasn't blaming rod bearings for the failure I was thinking that since there was all that pressure that it put a lot of stress on the bearings causing them to fail so quick. Yes I saw the glowplugs and it looked like they were about to go through the hood. I'd like to know what the wrist pins looked like