SV: "Leaf Blower" Forced induction idea

[Peter D. Hipson]

Coleman's has a number of small 4 cylinder air-cooled engines cheap. Let's 
see, maybe the world's fastest lawn tractor?

At 06:23 PM 3/19/2001 -0500, you wrote:

>Why do I keep thinking about putting this on my lawn tractor? That, a single
>small injector and a '747. . .
>
>BobR.
>
>Greg Hermann wrote:
>
> > At 1:30 AM 3/17/01, espen hilde wrote:
> > >Hi!
> > >Thanks for showing us in matematical terms !
> > >Your calculation just showed me that its possible......
> > >I am Norwegian I am used to think in 1.9l four banger  you are american,
> > >350 is the natural thing....
> > >350 is 5.735 litres thats 3 X 1.9l engines.
> > >You clame that anything less than making the output times 2 of an 
> engine is
> > >not interesting?
> > >The 1.9l needs 13.3HP to make 1 bar boost after your calculation...I would
> > >be happy with 0.5bar thats 50% increase in power!!!  I would need half the
> > >output , thats 6.65 hp ....2 Leafblowers 3.32 hp each ....Thats about what
> > >a leafblower gives .....
> > >and it could easily be tuned to give 5-6 hp each !
> > >thanks
> > >Espen
> > >Dont be embarrased .....I use to have it on my head all the time...
> >
> > Espen-- the increase in compressor HP as boost increases is non-linear. IF
> > it takes 14 HP to make 1 bar of boost , it will take less than 7 HP to make
> > .5 bar of boost.
> >
> > Greg
> > >
> > >
> > >
> > >Stewart Prince [SMTP:sprince at csun.edu] skrev 16. mars 2001 23:12:
> > >> Let' say you had a 350 ci engine, running at wot, 3000 rpm.  This is
> > >about 1400 lbm/hr or air
> > >> entering the engine.  If the boost density ratio was about 2, then we
> > >have about 2800 lbm per hour
> > >> of air entering the engine.  Assuming a specific heat of 1 kj/kg K 
> and an
> > >inlet temp of about 290
> > >> K, with a compressor efficiency of about .7, this is about  30 kwatt, or
> > >40 horsepower!  You need
> > >> to get this power from somewhere,  and if it's an electric motor, a  40
> > >horsepower electric motor
> > >> is HUGE!!  What I'm trying to say is your leafblower might put out a
> > >bunch of air flow, but not
> > >> when the pressure is twice atmospheric.  If you used a mechanical device
> > >such as a belt driven
> > >> supercharger, you would get about 2800lbm/hr / .5 lbm/hp-hr/14 about 400
> > >hp, but you would have to
> > >> subtract off the 40 hp to run the s.c. so net is 360.
> > >>
> > >> espen hilde wrote:
> > >>
> > >> > Second tought.....use two and take them in series , one pushing the
> > >other ,twice the pressure!
> > >> > Espen.
> > >> > How about a little factory making nos in the car?
> > >> >
> > >> >
> > >------------------------------------------------------------------------
> > >----
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> > >quotes)
> > >> > in the body of a message (not the subject) to
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> > >>
> > >> --
> > >> STEWART PRINCE
> > >>
> > >> PROFESSOR, MECHANICAL ENGINEERING
> > >>
> > >> CALIFORNIA STATE UNIVERSITY, NORTHRIDGE
> > >>
> > >>
> > >>
>
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