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Re: air mixture

To: land-speed@autox.team.net
Subject: Re: air mixture
From: ARDUNDOUG@aol.com
Date: Tue, 8 May 2001 11:33:43 EDT
In a message dated 5/8/2001 6:11:16 AM Pacific Daylight Time, 
saltrat@pro-blend.com writes:


> Scott,
> If they're not leaning the mixture with the carb jets or a MAP sensor on
> the EFI, then they are leaning the mixture with Nitrous.........about 15 to
> 20% leaner than at sea level. 
> Now if the density altitude at Maxton is 5000 to 7000 feet then there may
> not be a rich mixture problem at Bonneville????? I have to compensate for
> the altitude with my mechanical injector.
> Skip H
> 
> Scott,
>     Skip's right. Another factor is that with a carb the more (or less) 
> airflow mass you have, the more (or less) fuel gets siphoned out of the 
> float bowl(s). That, to some degree, will compensate for density-altitude 
> changes.
>     With a mechanical injector the fuel pump is positive displacement, 
> delivering the same volume and pressure at a given RPM regardless of the 
> air density. With a "pill-and-pump" mechanical injector setup the fuel and 
> air never "talk-to-each-other" until they meet right above the intake port 

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