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Cam degreeing problems

 
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Beck
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PostPosted: Tue, Feb 20 2018, 5:44 pm    Post subject: Cam degreeing problems Reply with quote

I have a cam that’s way off from where I want it installed. I’m using an OEM cam in a “back up” motor. In my “primary” motor I had a cam reground. I provided a “cam doctor” sheet from the OEM cam to the regrind company and ask where I should dial that one in at. Either they aren’t the brightest or Mercruiser really missed the mark in the cam or timing set. The factory cam with factory timing set has the #1 intake centerline at 116 deg. I want to put it in at 108 to 109 degrees. That means I need to move it 7 to 8 deg. An offset key will give me 2 deg. A new timing set with the 3 crank keys will give me 2 deg more. That still lets me 3 to 4 deg off.

The only way I can see to get this dialed in is to broach a new keyway in my original crank sprocket. If I move it about a half a tooth I should get 8 deg. There are 22 teeth in my crank sprocket, so one tooth is about 16 deg.

Anyone have a better idea?
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enjenjo
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PostPosted: Tue, Feb 20 2018, 8:07 pm    Post subject: Reply with quote

I think broaching a new key way is your only sensible choice. You should be able to have it done fairly cheaply, that is a common key size.
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