Comments on: Honda V4 Engine with Unequal Cylinder Spacing and Cylinder Deactivation

By: sirboomdotcom

sirboomdotcom — Mon, 21 Sep 2009 22:48:39 +0000

They write them confusing because then it’s easier to hang up in court in a patent suit.

By: Nicolas

Nicolas — Mon, 14 Sep 2009 17:39:32 +0000

If you space out the 2 front cylinders a little bit more, you can even fit the 2 rear cylinders in between … and get a 4 in-line

By: The Phantom

The Phantom — Mon, 14 Sep 2009 07:47:19 +0000

Hugo writes: “The whole bike can be smaller (almost like a V-twin) creating a smaller frontal area hence a higher top-speed (and maybe better controllable) It is funny the idea hasn’t been used before…”

Hugo, throw a leg over a VFR750 or VFR800 – they don’t make the most of the two-cyclinders-wide layout, but they are a lot narrower between your knees than your average I4 (MV’s F4 doesn’t count as it’s as narrow as a 916!).

That V4 layout looks to me like what might be inside the RC211V’s 990cc V5 – rumoured to have one cylinder smaller than the other four which were the same size. That V5 itself was largely based on the RC45 power plant. Which, to round things off, became the 1999 VFR800 motor after they swapped the 360 degree crank for a 180 degree crank.

In a nutshell, Honda has a fair idea of what they are doing here.

By: Bob Nedoma

Bob Nedoma — Mon, 14 Sep 2009 03:48:29 +0000

I wonder, has anyone patented the wheel yet.??….
So, what will happen to this motor after running in city traffic (year round) 85% of the time in the two and three cylinder mode?

By: tim

tim — Mon, 14 Sep 2009 02:29:00 +0000

wait, whut? Has it got a front mount rad? if so how does “Cooling air” get to the rear cylinders. Unless it has side mount rads like an RC-51?