Two Stk

[Bob Richards]

I've heard of heating the fuel before it goes to the
carb (on automobiles) improves the vaporization and
can increase mileage. Don't know if it is true, but
sounds plausible.

I believe the majority of the vaporazation in our
engines occurs in the crankcase (two strokes), not in
the carb. I also think that this process helps cool
the engine internally, especially the piston.

This reminds me of a problem I had with a generator a
couple of years ago. Ran fine for about 30 minutes,
then would start running erratic. Finally, I figured
out it was carb ice. Click the link below to see the
quick fix for it. Ran a piece of dryer vent from the
cylinder head around to the intake. Got me through the
2003 ice storm, no power for several days.

http://www.toprudder.com/photos/feb03/carb_heat.jpg

Bob R.

--- Rcmaster199 at aol.com wrote:

>  
> The action of converting liquid fuel to a vapor in
> the venturi is a part of  
> the refrigeration cycle. It requires energy to do
> it, which comes from several 
>  sources. The most important source is the lower
> than ambient pressure as the 
>  piston drives to compression, but ambient air and
> crankcase heat contribute  
> also, once the engine has reached steady state.
> Insulating the carb body 
> places  different demands on these sources of
> vaporising energy. 
>  
> Potentially, it may reduce air temp further which
> may have a supecharging  
> effect. I think you are after improved sealing
> between the carb body and the  
> throttle barrel, but this could be an added benefit.
>  
> Interesting idea Nat
>  
> Matt
> In a message dated 2/28/2005 9:02:14 PM Eastern
> Standard Time,  
> natpenton at centurytel.net writes:
> 
> The carb is a potent refrigerator. Most carb case 
> heating comes from ambient 
> air, not from engine case conductance. The engine 
> crankcase though, should 
> be well ventilated. The  situation may be better
> with a plastic bushing for 
> mounting the carb to  engine case, although I have
> not done so.  Nat
> 
> ----- Original Message ----- 
> From:  _Dean  Pappas_ (mailto:d.pappas at kodeos.com)  
> To: _discussion at nsrca.org_
> (mailto:discussion at nsrca.org)  
> Sent: Monday, February 28, 2005 1:49  PM
> Subject: RE: Two Stk
> 
> 
> Did you turn down the carburettor boss to make a gap
> that's filled  with 
> vinyl?
> If  not, then it's an awfully thin bit of insulation
> that provided the 
> desired  effect.
> later,
>     Dean
>  
> Dean Pappas 
> 
> 
> 
>  
> 

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