On a two-stroke motor, the reed valve is used for the intake only. The
exhaust port is uncovered as the piston travels downward (it is in the
cylinder wall). You can get dual stage reed valves that part opens at a
certain vacumn and the second half at higher vacumn. See how they work at
www.howstuffworks.com
Dale"chief" Thomas
From: Lawrence E. & Cathy R. Mayfield <lemay@hiwaay.net>
To: V4GR@aol.com <V4GR@aol.com>; land-speed@autox.team.net
<land-speed@autox.team.net>
Date: Wednesday, February 23, 2000 6:31 PM
Subject: Re: Flathead V1
>Didn't some of the 2 stroke motorcycles use reed valves? Of course they
>don't function against combustion pressure, just crankcase pressure cycles.
>I would think that the flow provided by a reed valve would be inferior to a
>poppet vavle since the reed is usuallin the way of the flow coming straight
>out. Since the combustion pressure is till pretty high in the chamber at
>BDC how would you open the exahust reed? For that matter, how would you
>keep it closed? Hmmmmm... seems implausible to me, but that's what this
>country great! People doing things that couldn't be done. Good subject..
>
>mayf
>
>At 04:10 PM 2/23/00 EST, V4GR@aol.com wrote:
>>I was thinking a little about reed valves and combustion pressure, and I
>>thought about Pulse Jets as used in the V1 Buzz Bombs. That is basically a
>>reed valve, combustion chamber, injector nozzle, ingiter, and open
exhaust.
>>Couldn't have much combustion pressure, but enough to lift at least 1000
>lbs?
>>I guess a reed valve could be made pretty solid, but than it would be slow
>>acting I think. 3 or 4 "automatic valves" that open when exposed to vacuum
>>could be placed around the spark plug. Any input on this? I don't want to
do
>>it I just want to think about it. Rich Fox
>>
>>
>
>
>
>L.E. Mayfield
>124 Maximillion Drive
>Madison, Al. 35758-8171
>ph: 1-256-837-1051
>
>http://home.hiwaay.net/~lemayf
>
>lemay@hiwaay.net
>
>Sunbeam Tiger, B9471136
>Sunbeam Alpine Bonneville Land Speed Racer,
>'66 Hydroplane Drag Boat (390 FE)
|