Espen's Reed Valves

[Espen Hilde]

The Honda vtec engine impresses me, 1,8l, 207hp at 8500rpm.
Same torque as other 1.8l at lower rpm......
A poor mans Vtec for big cubes it could be something.....
My consern is to have a engine that performs better i all rpms.
Look at your torque curve, is it not flat does it stop to early? The arias
that are low could probably be fixed with reeds or a system simular to what
Alex describes.Its one thing 
that I think is a fault in engineering todays engines, and that is to use
thiese heavy valves that can stand the combustion pressures to control
a few psi......A valve that is to controll thise low pressures can be made
much faster acclerating and have a bigger dynamic working aria. The 
reed way is a do it yourself way.If you do it this way you dont have to
have a 
rollercam and heavy spring pressure to open and close the valves fast, and
all the other items that you need to beef up your valve system, you need 
more timing on your camshaft but gentle movements. Offcurse you need to 
have the same size air path that you would use in your max hp effort.
Please Fred , tell us more about your reed setup and your experiance with
it.
Espen

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> From: FHPREMACH at aol.com
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: Espen's Reed Valves
> Date: 10. mai 1999 08:51
> 
> In a message dated 5/7/99 7:20:35 PM Pacific Daylight Time, 
> claresnyder at home.com writes:
> 
> << All the idea of using reed valves would do is improve the low end
torque -
>  exactly what we want, while staying open at high speeds to reduce
>  obstruction - which we also want. If they lock open at 2000 RPM on a 2
>  stroke you should get some effect up to about 4000 RPM on a 4 stroker -
>  which sounds pretty good to me. >>
> 
> Aren't you really just trying to compensate for having the wrong
parameters 
> in your motor? If you are on the street, live with a low rpm torque motor
and 
> if you race, design for that application. Stop trying to have everything,
or 
> you will have a "cresent wrench" motor, one that fits everything on
paper, 
> but can't fit into half the places it needs to. After you figure out how
to 
> fit the reed blocks in, then you need to figure out how to get the fuel
to 
> stop puddling in the way to big plenum volume. but then you will need to
set 
> up a system to increase the octane as the RPM goes up. I applaud the 
> inventive nature of your work, but having gone down the road of this
before, 
> I can say that you will find a lot of better ways to make a motor work.
> Fred