Same here as LBZ except I was going about 40 on little boost about to set the cruise on a back road and then I got a engine light and heard bad noises and shut it down immediately
Cranks
- Thread starter Fingers
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Id like to hear if anyone's had a crank failure since switching to alternative firing order...
I've been watching a few pullers run them and I'm waiting to see if one of theirs let loose. No sense spending any of the coin if it may/may not work. I don't have the $ to find out the hard way.
I've been watching a few pullers run them and I'm waiting to see if one of theirs let loose. No sense spending any of the coin if it may/may not work. I don't have the $ to find out the hard way.
it still seems to me that LBZ/LMM's break cranks much more than LLY/LB7s. i know of a few high mileage LB7 cranks in builds that are still going without issue, including my own. It helps i had brian save a good spare crank for any of us to use in case that infamous day comes though
Since we started experimenting with this idea we have not scene one crank failure!
Its crazy how some guys reuse the same crank on built motors, and then some just break on a stock rig.
That's why it seems to be a specific crank problem(i.e. manufacturing) rather than a design flaw. EPD doesn't have enough out there to convince me they've made anything better, but I do appreciate what they're doing.
Good move in keeping a spare but my buddy broke his stock lbz crank then put an internally balanced lb7 crank in his lbz and it lasted two weeks. That wasn't alternative firing order tho... That was still 6 months out at the time
im not saying they dont break, you just hear about them alot less in comparison. ive got a year and half on mine and 13k on it so far. this with a crank that had 165k on it when i tore the block down. i know Jake has even more on his and brian has just north of 100k on his.
The first two (one street running Blower setup, One 3.0 Sled Pull Truck) that where done was 3 plus years ago. Miles on street truck last I knew was over 20k at which prior was only getting at most 500-2500 miles out of the cranks from the added stress of the cog pulley. Sled Pull truck has been over 1300 plus fly wheel for three seasons of supreme pounding and broken drive train which pushes extreme stress on the crank with no issues.
One stock
One Stroker
One Billet stock stroke
One internal balanced stock stroke stock LB7 Crank
One Stroker
One Billet stock stroke
One internal balanced stock stroke stock LB7 Crank
Looks like I will be able to measure torque flex in gross terms on the crank by logging the converter signal and Crank signal and plotting them against each other. I have a DAQ that should allow me to measure within 1/4° (15 arc min) at 4000 RPM. Since I can do that on a running engine, It has a good chance of pointing out the harmonic RPMs if that is what is happening.
You keep dodging what your firing order is.
Sorry but for the time being I need to keep it private.
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