[SEL] FMZ Gear and Timing questions.

[Jim Kirkes]

There is a two to one ratio between the crank and the cam so 
it has to be an even number.

Jim

Jim and Diane Kirkes
Hemet, California U.S.A.
jd.kirkes at verizon.net
----- Original Message ----- 
From: "Ron Page" <page at velocitynet.com.au>
To: "'The SEL email discussion list'" 
<sel at lists.stationary-engine.com>
Sent: Tuesday, December 02, 2008 3:24 PM
Subject: Re: [SEL] FMZ Gear and Timing questions.


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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