New 4 stroke engine


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Easy rider
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New 4 stroke engine

Postby Easy rider » Sat Sep 26, 2015 9:55 am



Today I found one interesting 4 stroke design :

http://www.new4stroke.com/



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Re: New 4 stroke engine

Postby brettchallenger » Sat Sep 26, 2015 12:46 pm

This is similar in concept to the two stroke Napier Deltic engine which started out as a marine application and went on to power diesel electric train engines in the UK.

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Re: New 4 stroke engine

Postby golden highway » Sat Sep 26, 2015 7:41 pm

Didn't Mazda or Triumph use a similar design back in the late 70's early 80's?

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Re: New 4 stroke engine

Postby brettchallenger » Sun Sep 27, 2015 2:27 am

Didn't Mazda or Triumph use a similar design back in the late 70's early 80's?



That was the Wankel (rotary) engine. Yes, both Mazda and Norton used it. It is a different concept to those described above.



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Re: New 4 stroke engine

Postby golden highway » Sun Sep 27, 2015 3:25 am

That's right now that is see the picture I remember it. Getting old

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Re: New 4 stroke engine

Postby Old Fogey » Tue Sep 29, 2015 5:06 am

Easy rider wrote:Today I found one interesting 4 stroke design :

http://www.new4stroke.com/


I can't see that this is much different to having valves controlling the mixture, other than adding in another lot of height, weight and vibration from unbalanced forces.
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Re: New 4 stroke engine

Postby FM-USA » Tue Sep 29, 2015 2:04 pm

I've seen this a long time ago.
On this 3 piston design. Pressure on the valve faces (2 smaller pistons) takes away pressure from the main piston. Granted that begets higher RPM's due to a overall shorter stroke but this design begets 3 times the ring seal problem. Ho w about oil lubrication to said rings? It will work if this engine is laying parallel to gravity. Pistons don't like oil sloshing downward. The radial engine always had problems with the lower 1/3 of it's pistons.

GREAT idea but too many extra moving parts.

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Re: New 4 stroke engine

Postby WingAdmin » Tue Sep 29, 2015 2:08 pm

FM-USA wrote:I've seen this a long time ago.
On this 3 piston design. Pressure on the valve faces (2 smaller pistons) takes away pressure from the main piston. Granted that begets higher RPM's due to a overall shorter stroke but this design begets 3 times the ring seal problem. Ho w about oil lubrication to said rings? It will work if this engine is laying parallel to gravity. Pistons don't like oil sloshing downward. The radial engine always had problems with the lower 1/3 of it's pistons.

GREAT idea but too many extra moving parts.

.


It also helps gets rid of heat, instead of blasting compressed, burning exhaust cases out past a tiny exhaust valve, it (relatively) slowly allows the gases to expand (and cool), before being ejected. That said, the friction of all those pistons sliding in cylinders is going to eat up quite a bit of horsepower.

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Re: New 4 stroke engine

Postby FM-USA » Tue Sep 29, 2015 2:57 pm

That's another thing about current gas engines.
Why is the hot exhaust not utilized other than a Turbo? Work/power can still be milked out of that wasted heat.
Might be minuscule but it's still usable.
Heat expanding turbine to generator comes to mind. (NOT thinking of how, just thinking)


"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.


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