[SEL] Flywheel dangers

[Skip Cleveland]

All right John, your fishing. My "M" fires every time wheather it is running 
on the gas start up tank or kerosene. It sounds the same too. Just don't 
stink as pretty on gas.

Skip
----- Original Message ----- 
From: "John Culp" <johnculp at chartertn.net>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Friday, December 30, 2005 9:27 PM
Subject: Re: [SEL] Flywheel dangers


>> Before he sold it, we ran Dave Rotigel's 12 hp T/G Hercules on kero. 
>> That
>> engine was DEFINITELY happier running on kero than running on gas.  It 
>> ran
>> steadier, generally firing every 4-stroke cycle and had a softer, more 
>> mellow
>> exhaust note.  On gas she'd often fire every other 4-stroke cycle and had 
>> a
>> much sharper bark.
>
> That, paradoxically, is because it's running less efficiently on kerosene. 
> The engine slows down and opens its throttle valve a little more, which 
> lets in enough fuel-air mixture to make a combustible mixture with the 
> noncombustible exhaust gas remaining in the clearance space of this 
> low-compression engine. On gasoline it speeds up more with a power stroke, 
> the governor responds by closing the throttle further, and the small 
> amount of fuel-air mixture is too diluted by noncombustible exhaust to 
> fire. As the engine goes on through its cycle and flushes that charge out, 
> the next one is combustible AND contains part of the fuel-air mixture that 
> was admitted on the previous cycle, so it makes a bigger "explosion" in 
> the cylinder, and it repeats. 8-stroking. The sharp "bark" every other 
> cycle is because more fuel is burning than would be if it fired every 
> cycle. Sometimes you can get it to settle down and hit every lick while 
> idling on gasoline, and it'll quieten down more than it will on the 
> slow-burning kero.
>
> John Culp
> Bristol, Tennessee, USA
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