SV: "Leaf Blower" Forced induction idea

[Glenn D]

I was thinking of using one of those 2 stroke petrol leaf blowers, saves 
wiring up an invertor.
This would be on a little 2litre 'experiment' engine..
Will let people know how it goes..

I have heard of someone using a vacuum cleaner electric motor to force air 
in, and it did work to some extent.






>From: espen hilde <mwichstr at online.no>
>Reply-To: diy_efi at diy-efi.org
>To: "'diy_efi at diy-efi.org'" <diy_efi at diy-efi.org>
>Subject: SV: "Leaf Blower" Forced induction idea
>Date: Sat, 17 Mar 2001 01:30:24 +0100
>
>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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