That's what a square 4 is - 2 cranks geared together.
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The angle of the V on a two stroke is not relevant is it? They don't share a crank pin between cylinders, so the V is just for making space.
There wouldn't be a great deal of gain one way or the other. to time the firing strokes oddly with two cranks or one.
Yes and no the firing order is also semi dependent on the V angle as well in a single crank setup.
The single vs the twin cranks has it pro's and cons.
From memory Honda ended up at well over 100 (113?)degrees.With a short but wide engine and a balance shaft.
But power productive short straigh intakes and tidy airbox set ups
The twin contrarotating cranks have plus and minuses in high HP applications, as they have no hunting tooth in the primary drive.
Yet can be narrower but are less neat in execution more problematic in packaging potentially heavier and so forth.....
as for gains with firing orders Honda had them when the tires were not so great with the 2 up firing order and finally the big bang.
These advangages were nullified with traction control and with improved tires.
But this is my Fav Narrow angle V set up the Derbi 125
Last edited by husaberg; 15th May 2013 at 20:21. Reason: it was 112
its really a double tandem twin, think 2 x kr250's side by side
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What is? A square 4 is?
The Suzuki we are talking is well not really?
Maybe at best its two Tandams side by side and then Twisted apart 90 dergree's
come on do you have one in the garage, you probably do.........the road engine was a fair bit uglier.
I was thinking it was Stepped but that was the RG500. THe Honda single crank is prettier in My opinion shame it isn't case reed
Its not hard people a 'square' is just that 4 pots in a square format ie: the Ariel and RGB only avaible with twin crank, a V is in a vee format either single or twin crank... if a twin is parallel I only know of single crank but if a tandem twin then it has to have 2 cranks... as Yowling says the RS67 is a weird set up more like 2 tandem twins... or is it more two parallel's with two cranks... shit sake give me a V2 and be done with it
cheers DD
(Definately Dodgy)
Um it is actually a square 4
The write-up from when it was produced states:
250cc 4 cylinder
using parallel crankshafts, two diagonally opposed cylinders fire together
produces 52hp @ 12500rpm
22mm bore carbs feeding disc intake valves
multi plate dry clutch
and it was raced in 1964-65 albeit not very successfully with being notoriously difficult to tune & also heavy
Yamaha made a 250 V4 8spd a bit later at the end of 65 revealed it at Monza, produced 60hp. And at the IOM was clocked at 150mph.
It was essentially two of the 125 engines grafted together on a common crank.
Not quite 1950s but my old man has loaned me his '77 Kawasaki Z650 while I'm in Australia for his wedding. I'm surprised how hard it goes, it even gets through corners quite quickly.
Carbs are a bit dodgy and need to be cleaned and synced and it uses a bit of oil but very much "old school cool"
Gotta ride to Sydney tomorrow (3.5 hours of fun roads cos I'll be going the back way) I'll snap a couple of pics and post them up when I get there.
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