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Hit and Miss Engine Dyno Dynamometer


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  #1  
Old 06-11-2018, 07:00:50 PM
David Cave David Cave is offline
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Default Hit and Miss Engine Dyno Dynamometer

I love to hear engines bark under load and also to demonstrate how a hit and miss works. I have 2 videos, the first discusses the principals then builds a small portable, calibrated dyno made from a treadmill motor. The second runs an engine at various loads and calibrates the dyno.

https://www.youtube.com/watch?v=heFTZiWnGDo

https://www.youtube.com/watch?v=B8tcTBM-2CA

Hope you enjoy them.
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Old 06-11-2018, 07:35:56 PM
Pat Barrett Pat Barrett is offline
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Default Re: Hit and Miss Engine Dyno Dynamometer

Interesting, you put a ton of effort into setting all that up. Thanks for your effort.
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Old 06-11-2018, 10:51:00 PM
David Cave David Cave is offline
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Default Re: Hit and Miss Engine Dyno Dynamometer

Actually not a lot of effort. You could do the whole thing in a weekend. The wiring diagram is two wires and the efficiency is on the motor label. What took time - I spent weeks trying to make an old 1920's Delco light plant be the generator. They just don't have enough power so finally I gave that up and switched to the treadmill motor. The beauty is that I can now load on engine up to near max power and let her bark. I love the sound.
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Old 06-12-2018, 10:49:54 AM
Jim White Jim White is offline
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Default Re: Hit and Miss Engine Dyno Dynamometer

Very nice display and you did an excellent job explaining the "technical' data.
Your old teacher days?


Quote:
Originally Posted by David Cave View Post
I love to hear engines bark under load and also to demonstrate how a hit and miss works. I have 2 videos, the first discusses the principals then builds a small portable, calibrated dyno made from a treadmill motor. The second runs an engine at various loads and calibrates the dyno.

https://www.youtube.com/watch?v=heFTZiWnGDo

https://www.youtube.com/watch?v=B8tcTBM-2CA

Hope you enjoy them.
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  #5  
Old 06-12-2018, 12:31:40 PM
David Cave David Cave is offline
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Default Re: Hit and Miss Engine Dyno Dynamometer

Thanks Jim. At engine shows around here, for the most part, engines are run at 1 RPM above dying and no load. I wanted something to really demonstrate a hit and miss engine at shows. The load needed to be relatively small and light and portable so that by my self I could load it in my pickup. Almost forgot, it needed to be inexpensive otherwise my wife would complain.
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