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#1
10-12-2007, 10:48 AM
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617 Cam timing
Does anyone know how far the cam can be advanced without mech interference?
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#2
10-12-2007, 11:13 AM
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It can be retarded up to 8* through chain elongation.
Whatever you decide to do, turn it by hand before you use the starter!
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#3
10-12-2007, 01:13 PM
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Quote:
I don't think I'll ever go that far. May be limited to the offset woodruff keys available and the present chain stretch. I'm thinking there will be a big gap in available advance keys vs moving the gear one tooth and using the a key to retard. How many teeth on the cam gear? Turning by hand is a given... even then, it can be close cold but things could touch when warm.  My plan is to check the current timing and log some mileage, performance figures now. Then document any change(s) made. I think the in town drivability could be improved a bit by advancing the valve timing which would move the torque curve down closer to off idle rpm.
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#4
10-13-2007, 05:46 AM
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1 tooth is 18* measured at the crank.
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#5
10-13-2007, 08:15 AM
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Quote:
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#6
10-13-2007, 11:44 AM
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Thats a lot of room to move. Sound like the cam could be a little bigger.
 As soon as this head cold/upper resp crap clears up I'm going after it with the dial guage. The 1985 IP looks like a real PIA to get to the back mounting bolt.
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