total loss

[02BigD]

I run a billet wheeled 71mm h2e

71/? out of curiosity....

I'm also curious if anyone is monitoring back pressure with the 68? Seems like as low as it's spooling, maybe contributing to higher back pressure at WOT?

 

[97stoker350]

my bp gauge has never worked right but i believe it was around 50-53 at the most. nothing extreme. it has the 83 turbine and 1.10 housing

 

[chris1978]

71/? out of curiosity....

I'm also curious if anyone is monitoring back pressure with the 68? Seems like as low as it's spooling, maybe contributing to higher back pressure at WOT?

I'm guessing he's running a 71/76/19.

Sent from my Nexus 5 using Tapatalk

 

[m j]

Not at all. It's the 68 and the 200 nozzle matched up in a cylinder. Boost comes on early, lots of fuel, rpm and cfm, too much pressure on rods

IMO that is not what happened on this motor.
the broken rod is not a compressive failure (would be bent)
it is a tension failure. piston went up but didnt come back down with the rest of the rod.
if it was too much cylinder pressure it would have been driven down in to the carnage

 

[bruce]

I wonder if the big tires and 3.55 causin that rig to lug constantly aided in this destruction.

 

[Magnum PD]

Piston seized then?

 

[97stoker350]

Piston that went had Vavle slap and the valves pushed it howerever far down they go and that's where we found it so yes I'm guessing the rod pulled away

 

[isootmypants]

I'm thinking it was stress cracked before hand and it broke on the compression stroke, piston kept traveling upwards and contacted valves

 

[97stoker350]

I was running it pretty hard and when I let off is when I heard the grinding.
Valve slap was only from the piston being left at tdc

 

[V-Ref]

Sorry to hear your bad luck. Is this your only vehicle or do you have another way to pay the bills until you get this one back on the road?

Just my humble opinion...Metal fatigue is what broke his motor...I think he has a real well balanced and thought out setup, put together and tuned by good folks....stuff just breaks when you make power. It just sucks when it's your truck Billet rods/girdle/coated pistons blah blah...just move the weak point to your trans...or elsewhere in the system.

Build it back stronger than before!

 

[V-Ref]

71/? out of curiosity....

I'm also curious if anyone is monitoring back pressure with the 68? Seems like as low as it's spooling, maybe contributing to higher back pressure at WOT?

With the 1.10 Turbine Housing, I was seeing 1:1 up to about 35 psi, then at 45-50 psi boost, I was seeing 50-60 psi drive. 200% nozzles.

 

[97stoker350]

Rods and fire rings is about all I can afford unfortunaly... I'm gonna get a take out motor and do it.

 

[Powerstroke Cowboy]

If you go with billet rods I can shoot you a price.

 

[97stoker350]

more carnage. chunks out of cylinder 4 is the one that let loose

 

[97stoker350]

sorry #3 cylinder is fubared

 

[Obsledpuller]

riest: I have 300/200's and a s468 I feel like a ticking time bomb now!

 

[Powerstroke Cowboy]

I have 300/200 and a 66 that can light to 25 to 30 PSI before 2000 RPMs. and slip the clutch like crazy. Might be the life saver so far! LOL I try to keep my foot out of it.

 

[V-Ref]

BTS and South Bend sure are tearing up some motors lately

 

[Harlan@Outlaw_Diesel]

Ouch man!

 

[Magnum PD]

I have 300/200 and a 66 that can light to 25 to 30 PSI before 2000 RPMs. and slip the clutch like crazy. Might be the life saver so far! LOL I try to keep my foot out of it.

What clutch do you have?