[SEL] FMZ Gear and Timing questions.

[Ron Page]

Maybe my eyes need testing but I thought I counted 52 teeth.  Oh well.

Ron 
Canberra

-----Original Message-----
From: sel-bounces at lists.stationary-engine.com
[mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of Al Harris
Sent: Wednesday, 3 December 2008 7:09 AM
To: SEL
Subject: [SEL] FMZ Gear and Timing questions.

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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