5 Stroke Engine

[garth]

Did a quick search, couldn't see anything.

https://www.ilmor.co.uk/concept_5-stroke_1.php

[karthead]

I was doing a bit of research on this concept a while ago, but didn't really get the gist of it until now.

You reckon they will come into mass production in the near future? Or are they already being produced? I don't want to sound like an idiot, I cbf doing the research atm

[Walloper]

5 stroke my arse.
It's a four stroke with a 2nd cylinder used to absorb latent energy in the exhaust.
Double and Triple Expansion Steam engines were using the principle since the stone-age.



https://en.wikipedia.org/wiki/Steam_engine
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[daemonoid]

[Alpha-9]

Honestly don't know what makes a 4 stroke a 4 stroke
What's so 4 about it?

Seriously, I don't know
Actually, stop, wiki time.

intake, compression, power, and exhaust
oh okay

Mmmm wiki
https://upload.wikimedia.org/wikipedia/commons/d/dc/4StrokeEngine_Ortho_3D_Small.gif

https://upload.wikimedia.org/wikipedia/commons/3/31/2-Stroke_Engine_ani.gif

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[Wave2k]

Anything that stops me paying through the nose for fuel and isnt electric is a good thing.
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[Rogerborg]

Oh, now that is interesting, thanks for the link.
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[Matt-]

[Matt-]

Also found a very [bHELPFULL[/b] Website with video

https://www.5-stroke-engine.com/en/Prinzip.html
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[Walloper]

[swampy]

[binge]

[swampy]

[quote="binge"]

[binge]

Depends which way you want to look at it.

[swampy]

[Ariel Badger]

It is a conventional four stroke but with an additional post combustion power and exhaust stroke. 4+2=6 stroke not 5!
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[StevRS]

Read a while back that Lotus were developing a modern direct injection 2-stroke with no need for fuel-oil mixing etc.

Here it is: https://www.lotuscars.com/gb/engineering/case-study-omnivore-research-engine

Variable compression ratio, less complex than a four stroke and given there's half the number of 'dead' strokes in a 2, presumably far more power than a four.
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[Amreet]

[Knightsy]

To be honest, it seems like a decent idea. I'm curios to see if it takes off the ground though
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[Alpha-9]

[0l0dom0l0]

Direct injection with 2 strokes has been messed about with a fiar bit now.

The principle being that the fuel can be injected when both ports are closed, so none is wasted out the exhaust until after it is burnt.

Porblem with the concept is, and also why its not taken off like a house on fire just yet is how do you lubricate the thing?

I thought about injecting oil straight into the crankcase, but it doesn't vaporize so you can't really.

Not a massive fan of that new engine though, but we'll see if it takes off.
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[Walloper]

[Amreet]

[cb1rocket]

[Walloper]