LBZ: just split a piston at 250fwhp

malibu795

malibu795

misspeelleerr
Apr 28, 2007
7,854
283
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in the buckeye state
just happened couple hours ago about 1600 today.. just north of wytheville VA
haulling this whitch is 7 high 7 wide 8 long GVW is 23,000lb its currently tarped but still catched allot of wind..
178960_4538342490194_816702289_n.jpg

symptoms very rough idle and blow by pulsing out the oil dipstick insnic with dead miss and loss of power.

i dont know what the oil temp was.. but im guesing i get oil temps down it would keep pistons cooler.. what can be done to the oil squirters? open them up .00X"?

couple options...
1)no damage to cylinder wall... swap in new rod and piston..
2) damage to cylinder wall... sleave block new rod and piston
3) new short block

and increase oil cooling capacity.

right now it looks like i will be eating left overs im ~300 miles from home :eek:
 
whitetrash21

whitetrash21

put on da damn helmet day
Apr 29, 2008
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Vegas
You've only had that in for a couple mos, right?? High mile donor??

Sorry to see that, especially when it's your livelihood
 
adeso

adeso

wait, what?
May 30, 2011
1,569
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Minot, ND
ok first off, WTF is that thing
I don't see you getting the oil with a all stock truck unless you were running it really hard. I would put a oil temp gage in first if you are worried about it to see if you need to mess with it at all. What RPM/EGT/boost were you running? and yea, seems like a piston.
 
Fingers

Fingers

Village Idiot
Vendor/Sponsor
Apr 1, 2008
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White Oak, PA
I've seen one of those before. Mixer of some sort IIRC.

Cooler oil would help, cooler charge with more air would work better.

JMO

Call, I might have something for ya.
 
malibu795

malibu795

misspeelleerr
Apr 28, 2007
7,854
283
83
42
in the buckeye state
whitetrash21 said:
You've only had that in for a couple mos, right?? High mile donor??

Sorry to see that, especially when it's your livelihood
Click to expand...
i got the engine with 98k on it there is 142k on it now came out of a 06 3500service van
adeso said:
ok first off, WTF is that thing
I don't see you getting the oil with a all stock truck unless you were running it really hard. I would put a oil temp gage in first if you are worried about it to see if you need to mess with it at all. What RPM/EGT/boost were you running? and yea, seems like a piston.
Click to expand...

the knives in a paper shredder.. from domtar paper company headed to get rebuilt.

4.63 gears 31.5" tires is 2600 rpm @70. .75 od (4l85E tranny)
i was running 65 which is ~2400rpm
ECT normal to cold at 185-190*
boost 8-10psi normal for a high sail load... low sail is 5-8psi at same speed
timing ~8-9* at cruise
havent been able to get an EGT to work reliably autometer 1600 or a 2000
i find it very hard to believe that the engine at 250hp would run hotter then then 360hp LBZ engines
 
adeso

adeso

wait, what?
May 30, 2011
1,569
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Minot, ND
If something is going on high EGTs would lead to high oil temps and not happy pistons. How was your oil PSI? steady and normal? who knows maybe you just got one with a flaw in it
 
adeso

adeso

wait, what?
May 30, 2011
1,569
0
36
Minot, ND
Sounds like you just got unlucky, whoever made your piston must have been hung over that day. if you are towing heavy a lot a oil temp gage would be a good add on
 
JoeyD

JoeyD

WTF
Apr 21, 2008
51
0
6
If you have the room under the engine, can you run a 4500-5500 oil pan? Holds 4 more quarts i think, then add a external oil cooler. Should cure any oil temp issue's.
 
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