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Company builds 500cc ‘one-stroke’ engine

thedrive.com

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

#51

Post by Tuna-Fish »

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?

The same as any other engine that doesn't mix oil into its fuel.

Lubrication in fuel vs lubrication using a separate system and 2-stroke vs 4-stroke are two entirely separate engineering decisions, that are in no way tied to each other. It's just that the most common types of 2-stroke engine use lubricant oil mixed in fuel, and the most common types of 4-stroke engines don't, and so they concepts are thought to be related to each other by most people who don't know much about engines.

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

#52

Post by Tuna-Fish »

criddell wrote: post #23

I wonder if this would be a good engine for an airplane?

In terms of power curves and power to weight, absolutely. But I would be really unhappy taking off in a plane that uses a cam engine. Those are not historically known for their great reliability.

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

#53

Post by hatsunearu »

Tuna-Fish wrote: post #51
dreamlayers wrote: post #44

Earlier quoted context omitted.

So, how do they lubricate it?

The same as any other engine that doesn't mix oil into its fuel. Lubrication in fuel vs lubrication using a separate system and 2-stroke vs 4-stroke are two entirely separate engineering decisions, that are in no way tied to each other. It's just that the most common types of 2-stroke engine use lubricant oil mixed in fuel, and the most common types of 4-stroke engines don't, and so they concepts are thought to be re…

2-stroke engines often go into handheld tools or dirt bikes that can't explode when you turn it upside down (at least, immediately), and since it eliminates the oiling system, premix is often chosen for these.

2-stroke engines also have great power densities (at the cost of fuel efficiency), which means those two often go hand-in-hand.

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

#54

Post by dieselgate »

ksaj wrote: post #10
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…

Indeed. My old bike had 1400cc and was rated at only 94 hp.

There are 1.9L/1900cc turbo diesel engines rated at 95hp - funny to think about

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

#55

Post by marcus0x62 »

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.

And there are 4-stroke engines, such as the Stihl 4-mix[0] that use fuel mixed with 2-stroke oil for fuel and lubrication.

0 - https://www.stihl.com/4-mix-engine-lightweight-and-with-good...

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

#56

Post by marcus0x62 »

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.

> 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-induction.

A few videos:

Short video demonstrating the distinctive 2-stroke diesel sound: https://youtube.com/shorts/kp5aHCRAORs

These things were kind of prone to running away, with a lots of myth and folklore about catastrophic explosions and death and destruction, so there are a fair number of Youtube videos where people rig these things to run away. This is, without a doubt, on many levels, the best example of the genre: https://youtu.be/bLRF-LRgvJk

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

#58

Post by userbinator »

hatsunearu wrote: post #53
Tuna-Fish wrote: post #51

Earlier quoted context omitted.

The same as any other engine that doesn't mix oil into its fuel. Lubrication in fuel vs lubrication using a separate system and 2-stroke vs 4-stroke are two entirely separate engineering decisions, that are in no way tied to each other. It's just that the most common types of 2-stroke engine use lubricant oil mixed in fuel, and the most common types of 4-stroke engines don't, and so they concepts are thought to be re…

2-stroke engines often go into handheld tools or dirt bikes that can't explode when you turn it upside down (at least, immediately), and since it eliminates the oiling system, premix is often chosen for these. 2-stroke engines also have great power densities (at the cost of fuel efficiency), which means those two often go hand-in-hand.

2-stroke engines also have great power densities (at the cost of fuel efficiency), which means those two often go hand-in-hand.

Large, or perhaps huge would be a better adjective, 2-stroke diesels are extremely efficient, better than 2-stroke gasoline, 4-stroke gasoline, and 4-stroke diesels:

https://en.wikipedia.org/wiki/Brake-specific_fuel_consumptio...

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

#59

Post by ksaj »

watson wrote: post #26
ksaj wrote: post #9

Something to notice in the line drawing: The rear is powered by an electric motor. I assume that's to get it moving in the first place before there's enough momentum for this engine to keep it going.

I would assume so, yes. This is exactly how regular motors get started, unless you have one of those old-timy cranks you had to manually turn to get the motor running

They tend to be near the engine, and not the opposite end of the vehicle, though. The electric motor is right beside the passenger-side rear wheel.
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