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Re: Re: Re: Re: Re: Re: Re: Lead additive
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Posted by Jim Becker on December 18, 2001 at 07:13:39 from (4.61.16.38):
In Reply to: Re: Re: Re: Re: Re: Re: Lead additive posted by Bill Jones on December 17, 2001 at 13:47:37:
Bill,
Here is the part of your post I had a problem with: "Externally driven supercharger (Turbosuperchargers)compress the air before it is mixed with the metered fuel from the carburetor." This simply isn't true. If you quoted it from a textbook, the textbook is wrong. It may be that nobody has ever built an aircraft engine that uses a turbine compressor on the fuel mixture. In that case it would be true in an aircraft context. But it clearly is not true IN GENERAL. With a carbureted engine, it is pretty messy to compress the air before it goes into the carburetor. The main reason is that carburetors work via the partial vacuum in the venturi. The only way I know of to make them work is to put the entire carburetor inside a box and compress the outside as well. Then you need a high pressure fuel pump as well. You can compress straight air on engines that use fuel injection. This would be the case with modern gas engines that have fuel injection or any of the Diesel variants. In the 2 cycle GM Diesels the compressor is used to pressurize the crankcase. Bottom line on what a turbosupercharger is: a supercharger that is driven by an exhaust turbine. It doesn't matter whether it is compressing air or the fuel mixture. Are we in sync now?
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