Custom cut pistons & slightly modified crank
- Thread starter custom8726
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Damn Jason you really no how to work a motor over 
JK sucks to hear but glad the block and rods are OK . I almost bet the pistons are that damaged more from over heating it than the way they were cut the over heat; heated the pistons to the point that the high pressure spray was able to erode and dish out like that , jmop but I am no expert just have witnessed similar looking pistons ( not near as bad ) from tearing a motor apart that had been severely over heated. .
JK sucks to hear but glad the block and rods are OK . I almost bet the pistons are that damaged more from over heating it than the way they were cut the over heat; heated the pistons to the point that the high pressure spray was able to erode and dish out like that , jmop but I am no expert just have witnessed similar looking pistons ( not near as bad ) from tearing a motor apart that had been severely over heated. .
Damn man that sucks I kinda know how you feel except yours is worse I just pulled a stock lly with 80000 miles on out of a truck gonna swap with a built lb7 pm me if you need some parts ill make ya a good deal on some stuff if you are interested
Thanks, I will keep that in mind as I am not sure what exactly I need or am going to do as of now.. I have a Extra crank out of a LB7 sitting in the garage in good shape but I have no idea how many miles are on it. I dont know if I want to risk using that one, buy a low mileage one used or just buy a new one from Guy
A internally balanced Billet crank sounds nice about now
Damn Jason you really no how to work a motor over
I dont like doing anything half a$$ed
I also believe the overheating to be the biggest contributing factor in melting the pistons.. Lesson learned 
Thanks, I will keep that in mind as I am not sure what exactly I need or am going to do as of now.. I have a Extra crank out of a LB7 sitting in the garage in good shape but I have no idea how many miles are on it. I dont know if I want to risk using that one, buy a low mileage one used or just buy a new one from Guy
Billet everything sounds good to me lol just let me know if ya need anything :thumb:
If he needs a beta tester? Sure
Probably going to end up going with Arais pistons next go round though...
Dude that sucks!
I wonder if you wouldn't take a couple of good, clean, close pics of both sides of the break for me?
I wonder if you wouldn't take a couple of good, clean, close pics of both sides of the break for me?
Any one have a bore scope that fits through the glow plug hole?????? I may need to do some inspecting
I sure hope its not an issue on how the pistons were cut
sorry to hear about your carnage Jason
I sure hope its not an issue on how the pistons were cut
sorry to hear about your carnage Jason
U have any idea about how much h.p u were pushin?
Im about to go put my tow tune on lol...
That sucks but atleast u will be able to make it better:thumb:
Im about to go put my tow tune on lol...
That sucks but atleast u will be able to make it better:thumb:
Something has to be off for that erosion to be so widely off center. Either the spray pattern or bowl are off. That's terrible misfortune. Being that much off center with the flame, had to abnormally load parts all the way from the piston down to the crank. Were all the pistons eroded the exact same way? Same amount? How'd the Main bearings look? Are you going to have the rods checked for straightness? Being off less than the eye can see would cause problems in a new build couldn't it?
That sucks so bad dude. Your spirit is admirable. I'd be totally humbled.
That sucks so bad dude. Your spirit is admirable. I'd be totally humbled.
I took a couple already and put them in my original thread (LLY GOES BOOM)
If you need more pics just let me know, but the quality will kinda suck since they are from my phone, as my Good digital Sony just broke
Any one have a bore scope that fits through the glow plug hole?????? I may need to do some inspecting
I sure hope its not an issue on how the pistons were cut
sorry to hear about your carnage Jason
I really don't think that ^^ was the issue but a look see at your pistons wouldn't hurt
You also have to remember I am exceptionally ruff on equipment and even though I did not have much time on this motor I put it through hell on a couple occasions... Sh!t happens, I learned a couple things and will build it better this time for sure :thumb: Never dyno'd it but according to my MPH in the 1/4 and the online calculater here I would say (Roughly) mid/high 8's to low 900's WHP....
The pistons are all similar in erosion, some worse then others but a similar pattern none the less. The main bearing looked pretty good, only the one closest to the #2 journal showed significant wear but nothing that effected the Main's or rods/rod end caps in a visually negative way. Yes I plan on having the machine shop check them out to make sure they are still in spec but I would be very surprised if they weren't in spec after seeing the bearings.. I dont think my Injectors/spray pattern or the Bowles of the pistons were at fault personally. If you read my "truck fire thread" you would see my engine temp and EGT gauge were pegged completly in the BAD zone :booboo: :trueconfirmed: at a local sled pull were I pulled 3 consecutive times back to back. The truck never ran right after that night but I continued to drive it and also pulled one more time 2 months later. As Trent suggested, I think from the High engine temps and EGT's on stock pistons the Fuel pressure just shifted the tops of the (Melting) pistons in that spray pattern and then the pistons cooled and stayed that way.. JMHO....
Is that common for them to warp to a lop-sided position? I've never seen it. I have seen the uniform eroded star pattern & completely melted pistons but don't recall seeing any disformed so similarliy at each piston. Just doesn't seem right to me but I'm far from a anybody in regards to these engines, or any fir that matter. Just haven't seen a failure like yours before.