[SEL] FMZ Gear and Timing questions.

[John & Beryl Cooper]

Hi Al,
There are 50. Enlarged 400% and counting anticlockwise from  the pin 22 has 
a white dot, 33 a red dot and up to 50. The confusion seems to be in that 5 
o'clock area where the angle changes.
John
Bega NSW Oz
----- Original Message ----- 
From: "Al Harris" <al.harris at rustic-engines.com>
To: "SEL" <sel at lists.stationary-engine.com>
Sent: Wednesday, December 03, 2008 7:08 AM
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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> SEL at lists.stationary-engine.com
> http://www.stationary-engine.com/mailman/listinfo/sel


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