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Company builds 500cc ‘one-stroke’ engine

thedrive.com

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Re: Company builds 500cc ‘one-stroke’ engine

#41

Post by userbinator »

rolph wrote: post #3

actually a two stroke, 2 opposing pistons in a common cylinder cycling through compression stroke-combustion-power stroke. no connecting rod to bend or break, and large cams replacing the crankshaft https://www.thedrive.com/uploads/2023/07/14/innengine-1.gif?... [Now, here's the thing: this motor isn't a one-stroke engine. It has a compression stroke and exhaust stroke, making it a two-stroke cycle. INNengine acknowl…

this is 120HP in 500cc displacement, which is superbike engine stuff

The real question you should be asking when you see suspiciously high power densities is "for how long?"

A car and a truck engine can have the same HP rating, but the former is not going to last very long producing that power continuously, while the latter is essentially designed to spend most of its time at full power.

Re: Company builds 500cc ‘one-stroke’ engine

#42

Post by djaychela »

While the actual method of connection between pistons and the lobed plates seems new, opposed piston engines have been around for a long time, so I'm not sure this is quite as new as the article appears to make out [1]. I instantly thought "deltic"!

[1] - https://en.wikipedia.org/wiki/Opposed-piston_engine

Re: Company builds 500cc ‘one-stroke’ engine

#43

Post by jacquesm »

brucethemoose2 wrote: post #40
jacquesm wrote: post #15

Earlier quoted context omitted.

'old' may have something to do with it here, engine tech has seen all kinds of improvements over the last two decades resulting in tiny engines with ridiculous levels of output while still having reasonable life span. A pretty common small car engine that has .9 L displacement and a turbo yields 105 HP, that's 120 HP/L, vs 67 HP/L for your bike. A few years ago I had a 660 CC 4 cylinder engine in a car that did 67 HP…

The Ariel Atom V8 did ~160hp/liter in a 3L NA engine. I'm sure its pretty high strung, but its also older and more "conventional" than exotic supercar engines.

The Atom is an absolute beast.

Re: Company builds 500cc ‘one-stroke’ engine

#44

Post by dreamlayers »

s17n wrote: post #33

In case you’re wondering: “Now, here's the thing: this motor isn't a one-stroke engine. It has a compression stroke and exhaust stroke, making it a two-stroke cycle. INNengine acknowledges this and has said that it brands the motor as such because people would assume that a two-stroke engine would need to have oil mixed in along with fuel. Most two-strokes do. The company says that the one-stroke name was suggested b…

So, how do they lubricate it?

Re: Company builds 500cc ‘one-stroke’ engine

#46

Post by caseyohara »

userbinator wrote: post #38
s17n wrote: post #33

In case you’re wondering: “Now, here's the thing: this motor isn't a one-stroke engine. It has a compression stroke and exhaust stroke, making it a two-stroke cycle. INNengine acknowledges this and has said that it brands the motor as such because people would assume that a two-stroke engine would need to have oil mixed in along with fuel. Most two-strokes do. The company says that the one-stroke name was suggested b…

because people would assume that a two-stroke engine would need to have oil mixed in along with fuel That suggests most people don't know about 2-stroke diesels, although I suspect much of the older population (at least in North America) have probably heard or been on a vehicle that uses one.

Also plenty of (gasoline) two-stroke engines use oil injection so you don't have to use premix, namely any machine where you'd typically get your fuel straight from the pump like a snowmobile or a dual sport motorcycle, back when those were still two-stroke.

I had a 1983 Yamaha DT-80 (little enduro dirt bike) that had an oil reservoir so you could use pump gas.

Re: Company builds 500cc ‘one-stroke’ engine

#47

Post by jacquesm »

caseyohara wrote: post #46
userbinator wrote: post #38

Earlier quoted context omitted.

because people would assume that a two-stroke engine would need to have oil mixed in along with fuel That suggests most people don't know about 2-stroke diesels, although I suspect much of the older population (at least in North America) have probably heard or been on a vehicle that uses one.

Also plenty of (gasoline) two-stroke engines use oil injection so you don't have to use premix, namely any machine where you'd typically get your fuel straight from the pump like a snowmobile or a dual sport motorcycle, back when those were still two-stroke. I had a 1983 Yamaha DT-80 (little enduro dirt bike) that had an oil reservoir so you could use pump gas.

Those are pretty nasty for bystanders though.

Re: Company builds 500cc ‘one-stroke’ engine

#48

Post by jacquesm »

dreamlayers wrote: post #44
s17n wrote: post #33

In case you’re wondering: “Now, here's the thing: this motor isn't a one-stroke engine. It has a compression stroke and exhaust stroke, making it a two-stroke cycle. INNengine acknowledges this and has said that it brands the motor as such because people would assume that a two-stroke engine would need to have oil mixed in along with fuel. Most two-strokes do. The company says that the one-stroke name was suggested b…

So, how do they lubricate it?

Like any other engine with a separate oil system.

Re: Company builds 500cc ‘one-stroke’ engine

#50

Post by jacquesm »

djaychela wrote: post #42

While the actual method of connection between pistons and the lobed plates seems new, opposed piston engines have been around for a long time, so I'm not sure this is quite as new as the article appears to make out [1]. I instantly thought "deltic"! [1] - https://en.wikipedia.org/wiki/Opposed-piston_engine

That's a variation on the swash plate drive:

https://en.wikipedia.org/wiki/Swashplate

I like theirs better than an actual swash plate because you can pull all kinds of timing tricks by shaping the lobes just so, and it looks easier to lubricate.

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