Ancient History

[Mark Pitts]

In that case, how did the early wick carbs work?
Mark


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From:  RABBITT_Andrew at mv8.orbeng.com.au[SMTP:RABBITT_Andrew at mv8.orbeng.com.au]
Sent:  Wednesday, September 04, 1996 11:32 AM
To:  diy_efi at coulomb.eng.ohio-state.edu
Subject:  re: Ancient History

 
>> Liquid fuel does not burn - period.  It must be vaporized before it 
>>burns. All forms of carboration - including fuel injection - atomize 
>>the fuel hoping enough vapor will be formed to start combustion so 
>>that the heat and violence of combustion will finish the job.  Power 
>>and fuel efficiency are directly related to how well that is done.

>Um, sorry. Gasoline vapor explodes, it does not burn. Liqiud gasoline 
>burns....

You definitely DO want to minimise the vapourisation of fuel until the 
inlet valves are closed.  When fuel vapourises its density drops by a 
couple of orders of magnitude, displacing air and reducing your 
effective Volumetric efficiency.

All the applications that Robert J. Harris quoted in his original post 
were high-speed, high power applications, and sequential fuelling is 
not going to give you anything here.  What sequential injection does 
give is better low speed, part load combustion stability leading to 
better real-world driveability.