I think you are going to find the boost is going to go down a good deal as
well if you measure it after the intercooler... it would not surprise me to
see 8 to 10 lbs and the same power. Half of the boost is just hot air
without an intercooler..
----- Original Message -----
From: "drmayf" <drmayf@mayfco.com>
To: "Skip Higginbotham" <Saltrat@pahrump.com>
Cc: <land-speed@autox.team.net>
Sent: Friday, June 05, 2009 11:50 AM
Subject: Re: [Land-speed] Fuel Mixture Change?
> Skip, here is why, I think. YMMV, lol. The rootes is a positive
> displacement device. It pulls the air from whatever ambient conditions
> are. But the mass of the air is always the same per revolution. When that
> air gets under the blower it is hot, but it is still the same mass of air.
> That did not change. It goes through the intercooler and gets chilled
> somewhat. But the mass of air does not change. Just the temp changed. The
> mass that goes into the engine is the same mass that the blower pulled in.
> Since the mass is the same, the fuel requirements are still the same. You
> just now have a much cooler combustion chamber and are not killing pistons
> etc from detonation or heat. If you were still running the turbo, which is
> a constant pressure device rather than a constant volume, then yes, the
> fuel requirements would need changing becuase the mass of air changes.
> Thats what makes a turbo the far better choice for power adders (but efi
> required to make changes, lol). Cool the turbo air and it puts more mass
> in.
>
> mayf....
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