Ilmor Engineering builds a five-stroke motor

[Cajun]

With its 700cc, turbocharged, prototype motor, Ilmor is able to extract 130hp and 122 lbs•ft of torque. To achieve this, the motor employs two overhead camshafts. One is a “high pressure” camshaft, which turns at half the crank speed, while the other shaft is a “low pressure” camshaft, which turns at the same speed as the crankshaft.

info can be found
http://www.asphaltandrubber.com/news...estroke-motor/
&
http://www.fasterandfaster.net/2009/...00cc-five.html

[R6_kid:Me]

I love how ugly the styling of their bikes is.

[Badjelly]

...Ilmor has tried on several occasions to join the MotoGP ranks, and with fuel consumption a fairly large concern with the current fuel tank restrictions, Ilmor may have a nice competitive advantage brewing here. They will of course have to overcome the fact their design uses forced induction, but anything could happen with future regulations.

Ya're dreaming mate!

[Madmax]

Compound IC Engines have been around since 1890

[Madmax]

this guy sums it up

lago says:
August 15, 2009 at 9:53 pmWhile this looks like a clever way to increase efficiency and its convenient how every time one of the outside cylinders is on an exhaust stroke the central cylinder will be on a down stroke salvaging waste heat for extra power, almost exactly this setup has been used to increase the efficiency of steam engines for centuries (see Compound steam engine). Does the 700cc figure include the central second stage cylinder or only the two outer cylinders I wonder? While I could see fuel efficiency increasing from this design I’d be surprised if power/weight ratio wasn’t worse than conventional designs (hence the turbocharger in order to get the 700cc engine to produce the same power 600cc Supersport bikes are making now).

I’m also curious about how the reduced exhaust temperatures from the greater exhaust expansion affect emissions control equipment.

I do love how the central cylinder is 180degrees apart from the outer cylinders and is larger. If the central cylinder is exactly as heavy as the sum of the outer cylinders this engine should balance like an inline4 and not need counterbalancing. Would be cool to see a more conventional I3 engine with a larger central cylinder take advantage of that.

[Madmax]

http://www.dself.dsl.pipex.com/MUSEU...compoundIC.htm

[vifferman]

So, it's 700 cc, and 130hp, and aimed at competing with the 800cc 200+hp MotoGP bikes?

[Devil]

So, it's 700 cc, and 130hp, and aimed at competing with the 800cc 200+hp MotoGP bikes?

I saw that, but then did you see the torque figure? Yikes!

[vifferman]

I saw that, but then did you see the torque figure? Yikes!

Yeah, supercharging can do that.
It's kewl companies like Ilmor trying to be innovative and coming up with new concepts, but sometimes it's a waste of time/money. Like if they're doing supercharging, it would have been heaps more effective to take an existing, off-the-shelf engine, and whack a Rotrex blower on it. Even the mild mannered VFR800 (~100hp) can get 160hp with no mechanical mods and without compromising reliability/longevity.

[HenryDorsetCase]

Yeah, supercharging can do that.
It's kewl companies like Ilmor trying to be innovative and coming up with new concepts, but sometimes it's a waste of time/money. Like if they're doing supercharging, it would have been heaps more effective to take an existing, off-the-shelf engine, and whack a Rotrex blower on it. Even the mild mannered VFR800 (~100hp) can get 160hp with no mechanical mods and without compromising reliability/longevity.

I love how every time you post, you mention the Rotrex blower VFR. Its obvious you are totally smitten, and you just need to bite the bullet and buy the bloody thing. I read the thread when they were developing it, and honestly, you're a talented guy, you could totally do this. Now your suspension is sorted, you really do NEED this new mod to take advantage of the better-er handling and such.

You know it makes sense. I'll even break the news to she who must be obeyed (if you break the news to my she who must be obeyed about the RC51 I MUST HAVE).

Also, and kind of on topic, while this is cool and all, it doesnt give me wood like the direct injection two strokes do. Just saying.

[imdying]

I love how every time you post, you mention the Rotrex blower VFR. Its obvious you are totally smitten, and you just need to bite the bullet and buy the bloody thing. I read the thread when they were developing it, and honestly, you're a talented guy, you could totally do this.

I totally agree with his observation...

Get a personal loan, sell your body on the street, and just do it! Looks like a well thought out bit of kit, and you've already sold yourself on it, doesn't look like you'd be disappointed