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View Full Version : Namikoshi 4 in 1 piston engine!


V8Druid
22-10-2014, 09:49 PM
Well this is radical and looks real interesting

http://www.gizmag.com/namikoshi-4-in-1-piston-engine/34330/

Watch the vid - bet this'd rev!!:D

left hooker
22-10-2014, 10:30 PM
Well this is radical and looks real interesting

http://www.gizmag.com/namikoshi-4-in-1-piston-engine/34330/

Watch the vid - bet this'd rev!!:D

Looks like a cross between a rotary Mazda r8 engine and a Subaru boxer engine

It would definitely have bore wear problems (I would normally say on the thrust side) on the gravity acting down ward facing side

It says claims to cut down on vibration with opposite pistons working with each other but he does not have any enclosed cylinders on it to prove that and would have thought it would be more unbalanced if it ran that way as it would want to make the engine move more to the left and right as it fires ?

V8Druid
22-10-2014, 11:29 PM
Looks like a cross between a rotary Mazda r8 engine and a Subaru boxer engine

It would definitely have bore wear problems (I would normally say on the thrust side) on the gravity acting down ward facing side

It says claims to cut down on vibration with opposite pistons working with each other but he does not have any enclosed cylinders on it to prove that and would have thought it would be more unbalanced if it ran that way as it would want to make the engine move more to the left and right as it fires ?

Essentially a 4 cylinder 'boxer' Twin Stu, but just imagine a flat 16!!! :cool: or even a flat 20.
5 cylinders is apparently the smoothest configuration there is - can't remember the science of why, but the 5 cylinder Audi Quattro lumps were awesomely smooth and drove like a turbine!!

Should be smoother though without all them crank journals flailing about, balanced, or not - the concentrics in it ought to be silky smooth on roller bearings:rolleyes:

Ceramics'd cure the bulk of bore wear issues!!

left hooker
23-10-2014, 06:47 AM
Essentially a 4 cylinder 'boxer' Twin Stu, but just imagine a flat 16!!! :cool: or even a flat 20.
5 cylinders is apparently the smoothest configuration there is - can't remember the science of why, but the 5 cylinder Audi Quattro lumps were awesomely smooth and drove like a turbine!!

Should be smoother though without all them crank journals flailing about, balanced, or not - the concentrics in it ought to be silky smooth on roller bearings:rolleyes:

Ceramics'd cure the bulk of bore wear issues!!

I wouldn't be an engine you would use for torque would have the revs and hp but the torque wouldn't be that high in comparison to the hp

robex 210
27-10-2014, 06:49 PM
Didn't Norton have a similar sort of engine in the 70's in a super bike or g.p bike?:rolleyes:

V8Druid
27-10-2014, 07:45 PM
Didn't Norton have a similar sort of engine in the 70's in a super bike or g.p bike?:rolleyes:

Wankel rotary engine Robe - also did a civvy version and sold some to Mr Plod too.
Have a friend with a civvy and 2 plod versions - go well - always a lot of debate about 'sizing' 'em - either 500 or IIRC 850cc - went like an 850 but sipped like a 5!!
Terry loves his Norton Rotaries!!

V8Druid
26-01-2015, 10:50 AM
here's another very interesting engine design guys, that I thought you might find interesting.

23828

5cylinders , 3 litres, a third of the size of conventional, comparable, engines and 80% of the weight!! Oh and no valves :cool:

Will be interesting to see if/how/when these develop :cool:

http://www.gizmag.com/duke-engines-axial/33631/

left hooker
26-01-2015, 06:00 PM
here's another very interesting engine design guys, that I thought you might find interesting.

23828

5cylinders , 3 litres, a third of the size of conventional, comparable, engines and 80% of the weight!! Oh and no valves :cool:

Will be interesting to see if/how/when these develop :cool:

http://www.gizmag.com/duke-engines-axial/33631/

That design is based on a pto pump from a truck for tipping and if over revved they will blow it bits

V8Druid
27-01-2015, 11:16 PM
That design is based on a pto pump from a truck for tipping and if over revved they will blow it bits

looking at the picture with this article I'd say it's a 3 cylinder, not 5 - 3 carbs/venturis, 3 exhausts and 3 sparkies :confused:

23839

But then 'praps not????????:confused:

23841

Agree with you on the PTO pump - does look like one! :rolleyes:

longstroke
01-02-2015, 01:09 PM
Looks like a standard Swash plate (fixed) design hydraulic pump.

I've seen plenty as fixed and variable output pumps but it takes some kind of skill to see its potential as an engine!

Perhaps it is a variable swash plate type as then you would have variable compression ratios - combine that with turbocharging and you could be on a winner.
Although i'd guess its going to have serious lubrication issues...

Uffex1900
20-08-2015, 09:14 AM
This is also along the same lines https://youtu.be/wn4OaLm8pE4