[SEL] FMZ Gear and Timing questions.

[rdhaskell at juno.com]

Hi Al.
The cam gear MUST have twice the number of teeth as the crank gear.
 
Ron Haskell
rdhaskell at juno.com
Riverside, California USA
http://picasaweb.google.com/RonHaskell

On Wed, 03 Dec 2008 07:08:46 +1100 Al Harris
<al.harris at rustic-engines.com> writes:
> After considerable amounts of thought have left me brain dead I pose 
> 
> these two question to the group.
> 
> Humor me as I am not an injunear. Once upon a time I cou'nt even 
> spel 
> injunear.
> 
> Harry's Old Engine #6 here:
> > http://www.old-engine.com/fairbnk2.htm
> 
> is a 1922 model with straight cut gears with 51 teeth on the cam 
> gear, 
> count them here:
> 
> > http://www.old-engine.com/image/engines/fairbanks/IMG_2421w.jpg
> 
> OK, my first questions about Harry's engine and parts picture. How 
> many 
> teeth are on the crankshaft gear so that two revolutions of this 
> gear 
> revolve the cam gear exactly once, so that the timing does not 
> slowly 
> get out of sequence ? 25.5 ?
> 
> My second question is: my 1923 model has a diagonally cut  
> crankshaft 
> gear  with 24 teeth, how many teeth must be on my cam gear when I 
> eventually find one. Has anybody got one and can count the teeth for 
> me.
> 
> More importantly, has anybody got the correct cam gear, cam  and 
> push-rod that I need to get my engine running.
> 
> BTW my assumption is that it *can't* be 51 teeth, as two turns of 
> the 
> crankshaft would only turn the cam gear through 48 of its 51 teeth. 
> We 
> would end up with slowly retarding timing, right?
> 
> -- 
> Cheers and TIA,
> 
> Al Harris
> Summer Clarence Coast NSW Oz
> 
> al.harris at rustic-engines.com
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