[SEL] FMZ Gear and Timing questions.

[Al Harris]

Ron,

that is also my assumption, so how does it work with the cam gear from 
Harry's site that clearly shows *51* teeth on the gear?

Cheers,

Al Harris
Summer Clarence Coast NSW Oz

al.harris at rustic-engines.com



rdhaskell at juno.com wrote:
> 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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