Posted by Bob M on April 08, 2009 at 12:17:35 from (151.190.254.108):
In Reply to: Re: Magneto timing posted by ScottyHOMEy on April 08, 2009 at 11:07:58:
Scotty - My data is from page 7 of the I&T #IH-8 manual. Doesn’t mean it’s right however – I’ve found several other errors in this publication over the years…
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I suspect the “factor of 2” difference in timing advance values listed in some other sources may come from semantics and/or poor fact checking by the writers.
Specifically spark timing can be expressed in crank angle (which the engine tuner cares about) OR distributor rotor angle degrees (which the distributor designer must build for). And since 4-stroke engine's crank angles are DOUBLE the engine's distributor rotor angles (rotor to crank drive ratio is 1:2) it’s easy to see where a “factor of 2” listing degree error might creep in.
(Now imagine if we had both SAE and metric units for angles....!)
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“Could you reverse the direction of your plug wires to have it fire right?”
Theoretically yes. However a backward-turning magneto provides only a weak spark - or more frequently none at all. Also mag impulse couplings work only in the direction they are designed for.
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