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| Has anyone experimented with reed valves? https://slantsix.org/forum/viewtopic.php?t=38720 |
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| Author: | olafla [ Sun Jan 24, 2010 7:01 am ] |
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Thanks Kevin. I am just reading through some of the articles in the link from you and others; interesting stuff! |
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| Author: | olafla [ Sun Jan 24, 2010 8:07 am ] |
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emsvitil, your second link didn't work, I took the liberty of correcting it, see here. Those pictures is exactly what I envisioned at first and show exactly what a reed valve is, thanks for that link. ceej, you are absolutely on the track, my initial thinking was what you describe, but of course, a naturally aspirated Miller engine is not a Miller engine anymore! A Miller engine have to be supercharged to live up to the expectations regarding both power and emission. Naturally aspirated and with reed valves, that is what my idea is all about! The use of Miller cycle engines have to a large extent been limited to diesels and stationary engines. I know Mazda used it in cars, and they may still order it for some models I think, but the latest developments in combustion analysis may imply that the cost related to emission advantages for the Miller engine are probably too high. The dollar decides! You also mention dynamic compression, that is definitely something that require attention. It may seem that fuel injection would make any testing of reed valves easier, but my intention was to see if it easily could be implemented to a hotted street/strip car. I know I am very politically incorrect when I say that my ideas are not centered around emissions from an engine, I am interested in power, economy and driveability. After all, we are dealing with an engine construction abandoned by its maker years ago, so if there is an environmental gain, I see that just as an added bonus. |
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| Author: | olafla [ Sun Jan 24, 2010 8:14 am ] |
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Regarding the fragility of the reed valve, I think a screen in the intake runner to catch the pieces if a valve should break is needed at least for initial testing. Cheap insurance! |
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| Author: | adiffrentcity [ Sun Jan 24, 2010 11:13 am ] |
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I thought the same thing, then thought that it would kill airflow and possibly skew your test results. Reason being is that if the screen affected airflow much at all, not only would peak hp on the non-reed valve baseline suffer; but the "pulse" or "backflow" effect which would cause the reed valve to close would also be reduced. |
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| Author: | olafla [ Sun Jan 24, 2010 1:31 pm ] |
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Yes I see what you mean, but it will only be used when making the first tests (hmm, sounds like I have a test setup rigged already - not!) to be sure that the engine don't backfire or make unforeseen problems. I'll have to make a bench for flow testing to do some serious work once I see the concept works, initial testing will be done just to see if theory and practice work together at all, details like runner shape, length, valve placement, plenum chamber and all other things can come later. Olaf |
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