Hit & miss engines

[-Clayton-]

These things are amazing to watch. I'd love to find one to fiddle around with.

A little info on how they work for those of you who don't know what they are or how they work.


http://en.wikipedia.org/wiki/Hit_and_miss_engine

In action.
http://www.youtube.com/watch?v=DOCBHa0UIsI&mode=related&search=

 

[-Clayton-]

Another

http://www.youtube.com/watch?v=COBieSVfmuo

 

[oilyriser]

A modern car engine could be run hit and miss, and would get much better fuel economy than with a throttle.

 

[-Clayton-]

This one shows the innards a little better.

http://www.youtube.com/watch?v=5HwITJSFFJU

 

[-Clayton-]

Quote:

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A modern car engine could be run hit and miss, and would get much better fuel economy than with a throttle.

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Thats what I was thinking too.

 

[Camu Mahubah]

Once owned a Daewoo...believe it was a hit and miss engine...had good seats though...

 

[Gary Allan]

Hook that baby up to a touch and go transmission.

 

[-Clayton-]

Heres a little one.

http://www.youtube.com/watch?v=Z-S2TuZKuBY&mode=related&search=

 

[Aldaris]

Quote:

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Once owned a Daewoo...believe it was a hit and miss engine...had good seats though...

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[Al]

Quote:

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Quote:

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Once owned a Daewoo...believe it was a hit and miss engine...had good seats though...

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Hey don't knock it..Daughter had one fort 7 years. Actually the seats were the worst part of the car. They were like a rock.

 

[Master ACiD]

car engine wouldnt work as it doesnt have a big enough flywheel. these little hit and miss engines have monsterous flywheels, perhaps 80lbs of them. a car has what a 25lb flywheel? you would need a 600lbs flywheel for a car. not practical unless you pepper it with neutron star matter.

 

[ekpolk]

As odd and primitive as such an engine may seem (I've seen a couple at fairs and festivals displayed as curiosities), the underlying concept is appearing in more and more very modern designs. Although some might disagree, IMO, variable displacement schemes that shut off cylinders during times of low load achieve a similar effect (fewer "live" cylinder firings per revolution). GM, Chrysler, and Honda all have engines on sale now that do this. Even the gas-electric hybrids do something similar by turning the gas engine off and on in response to demand (and traction battery charge state), which also has the effect of reducing the live firings per rotation (at least when the ICE is freewheeling vs all the way off). In short, these old "hit and miss" engines are an ancient implementation of an idea that is still being used today, in much more refined form.

 

[Matt_S]

Thanks for posting this, Clayton! Those are sweet!

WRT modern cars, it seems to me that cylinder deactivation is pretty much the modern take on the hit and miss theory.