[SEL] What followed me home./now carby question

[Curt Holland]

Jim,
Thanks for the reply. It's surprising how many on the list have these 
versatile Hercules engines.
A few days ago I mentioned I was coupling this engine to a synchronous 
alternator. This weekend I started mounting the engine and generator on 
the cart. The engine is fixed in it's final location. Here are a couple 
of pictures of both on a mid-sized Hercules cart (how fitting, a 
Hercules on a Hercules cart).
http://www.oldengine.org/members/holland/images/P9090019a.jpg
http://www.oldengine.org/members/holland/images/P9090020a.jpg

I got ready to make the adapter to attach the alternator to the bell 
housing but thought I better make sure this engine would run the 
required 1800 rpm's first. While normally configured to run 1000 rpm's 
it seems reasonable to expect that a engine with an almost square bore 
to displacement ratio should be able to turn 1800rpm's. Well there lies 
the problem! With the governor pulled all the way open it will only 
reach about 1500 rpm's. Disconnecting the linkage and opening the 
throttle by hand, I can get it to 1800 but it is spittering and 
sputtering something terrible. No way it would pull a load.

As best I can tell the Marvel Schebler carby has a fixed jet and is 
intended to be run at a specific speed. There is no adjustment on the 
carby. It's sure not going to let this engine run at 1800 rpms in it's 
current configuration. Perhaps it needs a different jet for the higher 
speed/air velocity.
Does anyone on the list know anything about these Marvel Schebler 
carburetors and how to size jets?

Other than that the only solution I see is to go to the local used 
tractor parts place and find a comparable updraft carby that has an 
adjustment for fuel ratio like you typically see on a tractor.

Any thoughts guys?
Curt Holland
Gastonia, NC

Jim Dragoset wrote:

>Curt,
>Sorry for the late reply.
>I have two of these Hercules 4 cylinder units, military Korean War vintage,
>engine and generator.
>The big end of the armature has the flange with the four rubber bushings you
>speak of but the
>weight is supported by stub shaft that fits into the flywheel where a pilot
>bearing would be
>if there was a clutch. Another important function of this arrangement is the
>crankshaft thrust
>is independent of the armature. I would think a solid connection would work
>but, in addition to
>angular and center-line alignment, crankshaft end play would have to be
>split with the set made up.
>  
>