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That's exactly how I did it.
I'm running a 36 - 1 trigger wheel so.......
360 ÷ 36 = 10 degrees per tooth. Just take 360 and divide it by the number of teeth on your pulley to figure out how many degrees per tooth you rotate the engine in relation to the crank sensor.
This way you can figure out how many degrees BTDC on the compression stroke you are set at.
What I did was machine a center punch the same diameter as my sensor. When I had the engine set where I wanted it, I set the center punch in the hole and marked where to drill and tap it for the bolt.
I think mine is set somewhere between 20 and 30 degrees BTDC compression stroke if my memory is correct. The reason being was I set it so I was drilling into one of the "hills" of the air injection pulley/sproket instead of in one of the "valleys" yielding more material for the threads to be tapped into.
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