REFLECTOR: FRANKLIN CARBURETOR

michalk michalk at awpi.com
Thu Feb 2 13:10:42 CST 2006


The Franklin has a high overlap cam.  The torque curves show that it 
won't make good horsepower at the lower RPM's.  It really works better 
with a variable prop.

Scott Derrick wrote:
> Larry,
> 
> I bought a Catto Prop that had originally been built for a 225 HP 
> Franklin, but it wouldn't turn up high enough at static.
> 
> I ran it on a 200 HP Lyc and it was fine..
> 
> weird huh?
> 
> Scott
> 
> Larry Parham wrote:
> 
>> Surging is only part of the problem.  I did fix most of it with a 
>> manafold inlet gasket.  The other problem is Not Enough RPM.  The last 
>> one inch of throttle does not deliver any more RPM.  In fact it may 
>> even go down a little.  I only get around 2200 and doing a mag check 
>> at 1700, it would drop to 1200 and slowly build up to 1700 (10 sec) on 
>> both L and R.  An hour earlier I got 2330 with a good mag check on R 
>> and L and could lean to 2380.  Carb heat and Idle cut off seem to good.
>> ------------------------------------------------------------------------
>>
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