pdasterly

iTrader: (4)

5.7 block, broken crankshaft, What other cranks can be used such as ls2 lq4 etc..? I need a immediate replacement and new cranks are way too much

davidws6

iTrader: (36)

Where did it break at ?

You should find another LS1 crank cause if you go to any other, i e LS2 LQ4 or 9, the crank balance will be different because of the heavier pistons.

With another ls1 crank, the balance should be close enough for a stock engine.

However, if you find a cheap crank out of a ls2 or lq4, should cost around + - $200 to get the rotating ***. balanced. Which might be a good thing if your going to change cam/heads n such....

blk96406

iTrader: (18)

I was curious too where it broke and how............

pdasterly

iTrader: (4)

two journal bearings, am I saying this right?
I already have forged pistons and rods

Armageddon

iTrader: (41)

Your crank broke or got scarred up? I'm confused.

joecar

Pics...!!

Chevy406

iTrader: (12)

How on earth did you break it? Was it in a manual transmission car?

pdasterly

iTrader: (4)

some cell phone pics

greatskiiiier

iTrader: (10)

lmao thats not broken... you can have the journals regound for about a $100 and just put oversize bears in it

PROBLEM SOLVED!

Mart00SS

iTrader: (19)

looks like a spun rod bearing to me. It looks like it took a lot of material off the rod journal. If too much material is gone you may not be able to have it turned. I would find a used crank in the classifieds.

1CAMWNDR

iTrader: (21)

Agreed. See if a machine shop can measure it and they might be able to machine it.

Armageddon

iTrader: (41)

**** I thought you broke it. See if there's enough meat left to get it turned. If not, drop $100 on another crank.

racer7088

Just get another stock crank if it won't clean up.

trans_am7935

iTrader: (15)

grounding is your best bet...it will even take off some weight, that has got to be good for like a ET reduction of 0.0000000001 or something

pdasterly

iTrader: (4)

the crank is trashed, I got a replacement to the machinist, so now im just waiting

LilJayV10

iTrader: (39)

I was hoping to see some carnage pics! I figured something stupid happened to break a stock crank and all I got was some spun bearing pics!

So the crank was to far out and they hooked you up with a replacement? Was the oil pressure good? What kind of RPM's were you turning?

Silver408z

iTrader: (1)

Cool you got a new crank but something caused that to happen. Make sure you fix it before you put the new crank in and get the same result. There is a good chance the rods that had spun bearings need work/replacing too.

pdasterly

iTrader: (4)

long story, my first build the rocker arm bolt got stripped so I got it fixed(helicoiled), ended up swaping the heads to my new build and the helicoil held up fine. Finally made it to the dyno and once we started making some good number I started having problems, first I ran out of injector, so I put in some bigger injectors, bbk intake and throttle(up from stock ls1), mms crank pulley and 3.2 procharger pulley. Back to the dyno and now my map sensor is acting up. Turns out I had four broken wires on the engine harness. Back to the dyno. Now im getting valvetrain noise at idle. The rocker arm ripped out the helicoil and broke the rocker arm stand and lifter. I replaced the lifter and the head but I think some of the lifter got down into the motor. The carnage is in my wallet. One of the rods was damaged, they are eagle h-beam forged. Oil pressure was really low after the lifter replacement but not in the red. As soon as I put the procharger belt back you could hear some noise, then It just got worse and worse.

Z28_LT1

iTrader: (2)

haha..I was expecting an epic carnage snap montage of the crank. lol.

pdasterly

iTrader: (4)

I tore it down before it got to that point