SV: "Leaf Blower" Forced induction idea

[espen hilde]

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...



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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> --
> STEWART PRINCE
>
> PROFESSOR, MECHANICAL ENGINEERING
>
> CALIFORNIA STATE UNIVERSITY, NORTHRIDGE
>
>
> 
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