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Company builds 500cc ‘one-stroke’ engine

thedrive.com

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

#61

Post by userbinator »

marcus0x62 wrote: post #56
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.

> That suggests most people don’t know about 2-stroke diesels For anyone curious, the Detroit Diesel, aka the Screamin’ Jimmy, is the canonical example of a 2-stroke diesel. Fun fact: these engines all have a supercharger — which is required to start the engines - but are considered naturally aspirated. GM also made turbo-charged variants (which still had the roots blower for starting) that are properly forced-induct…

In the UK, Foden also made 2-stroke diesels, but they were nowhere near as popular or long-lived as in the US:

https://www.youtube.com/watch?v=5pwhm_xoDiY

What they all have in common is the sound that makes people think it's not a diesel, because the 2-stroke cycle causes them to sound like they're turning twice as fast as a 4-stroke. A 2-stroke at 2000RPM sounds like a 4-stroke at 4000RPM.

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

#64

Post by hypercube33 »

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.

My favorite thing about Detroit engines is they designed them to have the supercharger act as almost one of the cycles. Their intake isn't a valve it's actually a port the cylinder opens at the bottom forcing air in and exhaust out.

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

#65

Post by jauntywundrkind »

nharada wrote: post #62
jauntywundrkind wrote: post #12

120 HP is 88kW. You could shrink this considerably & still have a very nice range extender. (Edited: proper conversion)

What kind of conversion efficiency would you expect from a range extender, like 90% or so?

Converting shaft to electrical energy should be 90%+ efficient, yeah.

This is about the efficiency we should expect from modern EVs making traction power (with some better, some worse), and the efficiency backwards has some nuance about torque vs power, but generally generation is using the same principles & systems in similar configurations.

If anything, I think efficiency should be higher for comparable-ish systems, since a range extender can tune for an incredibly narrow power-band where-as EV electric motors have a range of rpm they have to operate across.

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