CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

LS crank reluctor wheel diameter?

boz42

1/2 ton status
GMOTM Winner
Joined
Jun 3, 2003
Posts
3,181
Reaction score
0
Location
Hopewell, Tn 38058
I am wanting to know the diameter of a LS style engine's crank reluctor wheel. Mainly interested in the 24 tooth version.
 
So the reason I am asking this is because I have an idea that sounds good in my head, but I need a little more info & moral support in my theory before I dive in.

I have a 0411 PCM. I also have a full unmodified 5.3 harness. I have EFI Live & a wideband O2 set-up that will data log into EFI Live, & lastly a Cadillac 540 stroker that needs EFI.

So I am thinking that the cool thing to do would be modify the LS style injection to work on the Caddy. Preferrably with the DIS.

Problems to work out:

1. Firing Order:
I can rewire the coils & injectors to correct that, then re-assign the injectors to the correct bank for the O2's to read correctly.

2. The 24 tooth crank reluctor wheel:
I know I need this for the DIS to work. I am thinking I can mount it on the crankshaft under the timing cover & mill the thickness of the reluctor wheel off the balancer snout to retain proper pulley alignment. Then drill a hole in the block or use the fuel pump mounting hole to mount a crankshaft position sensor. The problem there is I don't know if the 24x wheel will fit in my timing cover.


I have more things to address but I will stop there for now, all this typing & thinking is making my head hurt. Please let me know what you think.

Pics of the timing set to give you an idea:

caddytiminggear.jpg


caddytiminggear8.jpg
 
I believe I can convert my HEI to produce the Cam signal. I have done some reading on that, but if I can't I will put the 5.7 vortec dizzy guts in the Cadillac HEI housing. I was going to wait to get into the cam sensor issues till I had some more info on the crank wheel.

I may have it all wrong, but the crank signal is the one I am wanting to get figured out because in my mind that is the hardest signal to produce.

EFI Connection is what got me thinking I can pull this swap off. I am considering buying one of their reluctor wheels to work with, but at $249.00 I don't want to order one for the hell of it. There are some factory ones on evilbay for $30.00. I should just go ahead & order one of those that way I can figure out if it will fit in the Caddy's recessed timing chain cavity. If it will not I will have to try & machine one on a smaller scale or affix it to the face of the balancer. I really don't want to have it external of the engine. Even if it does fit it will have to be clocked to the crank in the right spot & I haven't done enough homework on that to have it figured out either.

I will just go ahead & bite the bullet & call EFI connection tomorrow & see if they will tell me the diameter of their wheel.
 
Last edited:
Man I love and hate when I get my mind wrapped around the axle of fuel injection stuff! Reading that thread you posted gives me bad ideas!
 
Try a 12552480. That's a 24x reluctor from a big block chevy, used in the medium duty truck L21 454 in 99-00. You'll need the corresponding sensor to work with the reluctor. This reluctor ring has an ID of 1.600 and an OD of 4.00

It's going to be tricky to get the crank sensor mounted in the right place, it will for sure require drilling a hole in the side of the block since the sensor has to read the side of the reluctor, not the front of it. A 5.3 style sensor might be long enough to reach, if not the 6 inch long 8.1l sensor sure will ;).
 
Try a 12552480. That's a 24x reluctor from a big block chevy, used in the medium duty truck L21 454 in 99-00. You'll need the corresponding sensor to work with the reluctor. This reluctor ring has an ID of 1.600 and an OD of 4.00

It's going to be tricky to get the crank sensor mounted in the right place, it will for sure require drilling a hole in the side of the block since the sensor has to read the side of the reluctor, not the front of it. A 5.3 style sensor might be long enough to reach, if not the 6 inch long 8.1l sensor sure will ;).


Thank you so much, that is great info.


Yes I am planning to mill a hole in the side of the block to install the Crank position sensor. Having a couple of options on length may prove to be very helpful.
 
Last edited:
Top Bottom