external reluctor wheel on crank pulley
Thread Starter
Staging Lane
Joined: Jul 2015
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external reluctor wheel on crank pulley long story, but I need a stock LS3 reluctor wheel attached to a stock LS3 crank pulley; it has to be precisely aligned with the stock internal reluctor wheel (cylinder 1 TDC aligned). also need a mount fabricated for stock crank position sensor to read the external wheel. Can anyone recommend someone that can fab this and test it to assure it works correctly?
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TECH Senior Member
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From: Central Cal.
Do you mean YOUR pulley is keyed, or ALL pulleys are keyed? If you mean ALL are keyed, that is not so. They are pressed on without a key.
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Originally Posted by G Atsma
Do you mean YOUR pulley is keyed, or ALL pulleys are keyed? If you mean ALL are keyed, that is not so. They are pressed on without a key.
To get the pair to match 100% you'll have to make the external pickup adjustable and figure out a way to time them, It shouldn't be that hard. Won't you also need to do the same with the cam sensor and so on? I can't see any reason to ever need a second backup ecu.
Thread Starter
Staging Lane
Joined: Jul 2015
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I have 2 ecm's for redundancy, but they currently share same crank sensor which is a critical component and single potential point of failure....simply put, if the CKS signal fails, engine also does regardless of how many ecm's I have. Because I'm using stock GM E67 ECMs I need to use a stock reluctor wheel, or other compatible 58x steel wheel, so couldn't use aftermarket external trigger kits.
My idea was simply key the pulley and shaft at 12 o'clock position (or mark both shaft and pulley otherwise) when #1 TDC then match internal reluctor position with external reluctor position and somehow secure to back of crank pulley so both reluctors positioned identically. Then fab a mount for sensor which can be positioned anywhere along the radius (at least in theory ).
As far as CMS, I don't see any reason to modify that, but could always disconnect or unable it in calibration/tune to back up ecm and it would simply run on wasted spark operation.
My local machine shop or fabricator does not understand the LS3 enough to want to really do this so looking for other fabricators with capability to do it. Any suggestions for such a fabricator?
My idea was simply key the pulley and shaft at 12 o'clock position (or mark both shaft and pulley otherwise) when #1 TDC then match internal reluctor position with external reluctor position and somehow secure to back of crank pulley so both reluctors positioned identically. Then fab a mount for sensor which can be positioned anywhere along the radius (at least in theory ).
As far as CMS, I don't see any reason to modify that, but could always disconnect or unable it in calibration/tune to back up ecm and it would simply run on wasted spark operation.
My local machine shop or fabricator does not understand the LS3 enough to want to really do this so looking for other fabricators with capability to do it. Any suggestions for such a fabricator?
Originally Posted by G Atsma
What sort of application is this being used for? NORMALLY CKS's don't fail that often, nor do ECM's. Is this a severe-use application?
Staging Lane
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https://www.holley.com/products/igni.../parts/556-109
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
Cool project. I like stuff like this. I installed dual pick up coils in the distributor of my boat, and had switchable ignition coils, mounted 2 HEI modules to a liquid cooled aluminum block of metal.
Most engines will run with either a failed crank or cam sensor (either, not both), as long as it happens once the engines starts and obtains synchronization between the two. It may not develop full power, but should run. It will not start with a failed sensor, or re-start with a failed sensor though.
But, if you wanted to, could you just machine the other side of the block to accept a sensor 180 degrees off? Then do the same with the cam sensor?
Most engines will run with either a failed crank or cam sensor (either, not both), as long as it happens once the engines starts and obtains synchronization between the two. It may not develop full power, but should run. It will not start with a failed sensor, or re-start with a failed sensor though.
But, if you wanted to, could you just machine the other side of the block to accept a sensor 180 degrees off? Then do the same with the cam sensor?
Last edited by FormulaBoat; Jun 25, 2019 at 08:44 PM.
Thread Starter
Staging Lane
Joined: Jul 2015
Posts: 82
Likes: 23
Thanks for input. I'm using a GM E67 ECM and engine shuts down when I fail the crank sensor even with operating cam sensor. I can not find a method in tune to keep engine running without crank sensor.
I also couldn't see an easy way to modify the block for 2nd sensor to use existing reluctor. Open and grateful for any/all suggestions. Thanks again.
I also couldn't see an easy way to modify the block for 2nd sensor to use existing reluctor. Open and grateful for any/all suggestions. Thanks again.