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Old Oct 12, 2009, 04:52 PM
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New 4 stroke engine

Pease visit new 4 stroke engine

Regards Andrew
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Old Oct 12, 2009, 05:06 PM
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Czesc! Morze cie wyrzuca stat. Ale, masz interesujacy silnik. Widzialem strone pare lat temu.

Greg
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Old Oct 13, 2009, 06:32 AM
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It reminds me of the sleeve valve engines of the 1920's and 1930's. The British had built hundreds of bombers that used the sleeve valve design engine.
Not bad though. We need some model engines to put on airplanes. it might be a lot of fun.
http://en.wikipedia.org/wiki/Sleeve_valve

With a sleeve valve engine you can get better volumetric efficiency but you usually have a problem with getting higher compression ratio's and the combustion chamber can't be as well designed. So in a automobile the engine would likely run pretty good but have problems with excessive emissions and polutants coming out.
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Old Oct 13, 2009, 08:07 PM
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I don't see how it would be any better or more efficient than a standard 4 stroke. You still have to have some sort of cam system to run the other crank/pistons or you would never have consistant timing. You have much more surface area to lubricate with two additional pistons/rings/cylinders and all the associated bearings instead of a couple pushrods, valves and springs.

Although it is a neat idea.

Mike
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Old Oct 13, 2009, 08:12 PM
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One advantage is it's unlikely you'd experience valve float with this at high rpm.
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Old Oct 13, 2009, 09:40 PM
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This type of engine does not have valve float at high rpms. Engine RPM is only limited by the design characteristics of the engine. It was a big reason why sleeve valve engines were popular for a while. At the that time or era, valves were a problem with not seating correctly, valve float, and valve stretch as the engines were used. Plus you didn't have to adjust valve gaps from time to time too.
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Old Oct 14, 2009, 06:40 PM
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Quote:
Originally Posted by earlwb
This type of engine does not have valve float at high rpms. Engine RPM is only limited by the design characteristics of the engine. It was a big reason why sleeve valve engines were popular for a while. At the that time or era, valves were a problem with not seating correctly, valve float, and valve stretch as the engines were used. Plus you didn't have to adjust valve gaps from time to time too.
O yes.

This is antyboxer or trueboxer ??





And weight....






Regards Andrew
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Old Oct 18, 2009, 09:47 AM
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I forgot about the RCV sleeve valve engines:
http://www.rcvengines.com/rcv91cd.htm
or
http://www.hobbyhorse.com/rcv.shtml
I wonder if one can still buy the engines or not.
A vendor forum is here:
http://www.rcuniverse.com/forum/forumid_145/tt.htm
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Old Oct 18, 2009, 11:34 AM
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RCV is still producing engines. Their scooter and UAV program appears to be in full gear.

Greg
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Old Oct 18, 2009, 11:51 AM
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Yes, my mate bought an RCV .91 this morning, at a swapmeet. Good paperweight, if you ask me.
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Old Oct 18, 2009, 04:33 PM
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The model engines do leave something to desire. The seals on the larger engines much better.

Greg
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Old Oct 18, 2009, 04:40 PM
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Quote:
Originally Posted by bogbeagle
Yes, my mate bought an RCV .91 this morning, at a swapmeet. Good paperweight, if you ask me.
RCV are an efficient and well respected motor, you obviously have no experience of them, so maybe it's better if we don't ask you.
For a proper view on RCV engines, including user comments, take a look at www.rcvengines.com or search RCV on RC Universe.

Another rotary valave engine was the Austrian HP 21/25/49/61VT series. Now in production in California by RJL industries. Take a look at www.mecoa.com and click on HP engines
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Old Oct 18, 2009, 04:46 PM
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Quote:
Originally Posted by BayNavigator
RCV are an efficient and well respected motor,
Not in this neck of the woods.
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Old Oct 18, 2009, 06:06 PM
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Sleeve valve automobiles existed in the early 1900s. One even raced at Indy! US patent, perfected in England.
http://en.wikipedia.org/wiki/Knight_Engine
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Old Oct 18, 2009, 08:03 PM
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Quote:
Originally Posted by bogbeagle
Yes, my mate bought an RCV .91 this morning, at a swapmeet. Good paperweight, if you ask me.

Yes, you are right, only to office destinations

Why: yeah because from the cylinder a hindered outflow is warm to chilling ribs, and collecting carbon deposit sie on the rotational valve of not a fortune-teller of the long failure-free exploitation. Appropriately the great channel in the rotational valve is also making the top compression ratio impossible, and behind it good effectiveness.

It is my proposal, le unfortunately nobody still for her produces. Please treat everything only as general outlines of the road which one could go.

This my 35 year old collections of new engines: two 2,5 ccm and one 5 ccm


and my flathead engine or sidevalve engine (flatty)

principe http://en.wikipedia.org/wiki/Flathead_engine

Only orientation schematics



Are unfortunatelly drawing - need 3D Drawig- first engine whos impossible drawig in 2D right.

And my vision this engine made orginal part other engines.

Two crankshaft in timing are work exellent.! ( my first prototype)




In this excell work , are possible changes all colour pole value.

pistons positions


my by sometime made it

Regards Andrew
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