Long story short: Lost my engine due to #4 rod letting go and wiping out lower end/block. Built a new motor but I believe I have an LNF crank in my new LSJ It was a new crank and same cast number but I think the trigger wheel is LNF or?? My old one was destroyed so could not compare them. I have 175psi of compression,180rpms of engine cranking speed (scanner info) 60psi fuel pressure,injector pulse (noid blinks) spark, but no start. Not so much as a pop. Is there any way I can verify an LNF trigger wheel visually by looking/counting the holes/slots on the wheel by looking through the sensor hole? If it indeed is an LNF trigger wheel,is it possible to have my ECU retuned to run on the LNF trigger wheel? Hate to have to do all that work over plus its all balanced etc.

 

Can anyone take a photo of an LSJ crank wheel mounted to a crank? Im using a bore scope, looking through the crank sensor hole, and the wheel looks to be a 58 tooth wheel.(57 small holes,one large slot/hole) I was told the LNF and the LSJ trigger wheels are the same,but are clocked differently, so I need to determine if this wheel is clocked for an LSJ or an LNF. I sure wish GM had put these on the harmonic balancer instead of the crank.

 

that's a query I have never come across.

I wish I could help, but I don't have a loose crank - only assembled motors.

I hope you find an answer.

 

The reluctor wheels are clocked differently and are completely different. Cant make one work in the other. Got to get the right crank.

 

Are the reluctor wheels removable?

 

Yes, they are held on by 3 bolts. I just dont remember if you can swap them out or not due to different bolt patterns. Let me look around the shop to see if I have a LSJ crank. I know I have a LNF, If I can find one, I will see if they swap.

 

Do not have a LSJ crank laying around...