SV: "Leaf Blower" Forced induction idea

[Greg Hermann]

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?
>> >
>> >
>------------------------------------------------------------------------
>----
>> > To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
>quotes)
>> > in the body of a message (not the subject) to
>majordomo at lists.diy-efi.org
>>
>> --
>> STEWART PRINCE
>>
>> PROFESSOR, MECHANICAL ENGINEERING
>>
>> CALIFORNIA STATE UNIVERSITY, NORTHRIDGE
>>
>>
>>
>------------------------------------------------------------------------
>----
>> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
>quotes)
>> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>>
>----------------------------------------------------------------------------
>To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org


----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org