Rather than the detuning of a RG500 with 50's pommy two stroke bits, or the use of a bantam frame to contain itOriginally Posted by Grumph
Anorak
Rather than the detuning of a RG500 with 50's pommy two stroke bits, or the use of a bantam frame to contain it
Kinky is using a feather. Perverted is using the whole chicken
Low personal B.M.E.P.
I've seen the poms do stranger things - if that's what you have on hand, it's all quite logical...Except for that shock.....Rather than the detuning of a RG500 with 50's pommy two stroke bits, or the use of a bantam frame to contain it
Muddler/Dabbler.
It's all a big shock! But the guy does have a sense of humour - no doubt only did it for a bit of fun and it was obviously a great talking point.
I must say that the original Arrow was a lot smokier than that one, so I bet it's not running on a 20:1 mix!
I don't think I'd ride it flat out for much more than a hundred metres as I'd fear for the cooling on those rear cylinders. - but a great effort ( at least he got off his ass and had a go!).
Strokers Galore!
Low personal B.M.E.P.
There's an annual moped run local to me - Sid's Run - which has turned into a competition between several very clever engineer/fabricators as to who can turn up with the weirdest concoction...
That "Bantam" would fit right in - except for the big bikes around it, the scene looks just like the start of Sid's Run...
Muddler/Dabbler.
Just as a matter of interest this is a prototype Ariel Arrow with a 700cc fourstroke four cylinder engine with the same arrangement as the much later BMW fours.
Never went into production but Sammy Miller used to ride it to work for years I believe and I think it now resides in his museum.
Strokers Galore!
Hardcore Biker
At first glance I thought that this was a uniflow 2 stroke, with a rotary exhaust valve in the head.
However, I soon realised that it's a 4 stroke, with single overhead camshaft.
I also thought that supercharging could be achieved with the two crankcase compression cycles per power stroke, but I guess it didn't work so well, as it never made production.
Hardcore Biker
That looks more like the museum at Willenhall, near Birmingham.Just as a matter of interest this is a prototype Ariel Arrow with a 700cc fourstroke four cylinder engine with the same arrangement as the much later BMW fours.
Never went into production but Sammy Miller used to ride it to work for years I believe and I think it now resides in his museum.
I'll check when I'm back at Sammy's museum next week.
Hardcore Biker
It's a turbo diesel twin, using two counter rotating crankshafts. More information, including an animation here: http://www.neander-motors.com/en/motoren/motorcycle/
I'd really like to have one of these engines. I'd use the parts to build two new engines. One would be a twin using the Neander top end with a conventional crankcase. The other would be a square four, using the Neander bottom end with four new cylinders, pistons and heads.
How's that for a pipe dream
Muddler/Dabbler.
OK, that would be good, there isn't a lot of info available on that one!
I'm afraid I haven't ever spent much time in England and it would be nice to spend a year or so there going round all the racing and bike scene in general. I haven't seen any of the museums either. (went to Earls court show once but that' about all).
Strokers Galore!
Muddler/Dabbler.
Husa, when did they make that one? that same concept was used (still is) very successfully in a model aircraft engine brand, called YS.
Don't know which would have come first, the fullsize Maico or the YS model engine?
Strokers Galore!
Low personal B.M.E.P.
Sammy actually built much of the rolling chassis. It's written up in an early issue of "The Classic Motor Cycle" which i have somewhere here.
Bob Currie who wrote the article actually remembered visiting Ariel in the 60's to see sammy about his trials bike - and meeting him carrying what was obviously two Leader headlamp assemblies welded together. "just something we're trying" said sammy...
He certainly did the restoration, where it is now I don't know.
Anorak
They did a prototype 350 foul stroke twin version or at least drew one up as well.Just as a matter of interest this is a prototype Ariel Arrow with a 700cc fourstroke four cylinder engine with the same arrangement as the much later BMW fours.
Never went into production but Sammy Miller used to ride it to work for years I believe and I think it now resides in his museum.
here is the sectioned two stroke
It has a cool internal external taper join on the crank halves.
Excelsior did a 250 and 325ish twin that was very "Villiers single like" to look at.
http://members.shaw.ca/elrojo/motorc...man_engine.jpg
They did a three cylinder version as well for invalid carriages and small cars. I'm not sure if the 3 cylinder was used in bikes or not I have never seen one 2 cylinder or triple. anyone seen one in the flesh?
Kinky is using a feather. Perverted is using the whole chicken
Anorak
Henderson Inline 6 when the usual/unusual four was just not enough
https://greasengasoline.wordpress.co...se-n-gasoline/
Kinky is using a feather. Perverted is using the whole chicken
Highway Biker
4T pushrod conversion to rotary valve engine Junak 350
here are pictures on page 1 2 3
And few clips
Muddler/Dabbler.
Funny thing about this thread is that sometimes there's nothing, then there's a torrent of stuff comes in and there's definitely a torrent now!
Yes Husa, I think Excelsior normally used the two stroke Villiers 2T and 4T engines or maybe developments of them- BTW, this denoted the models (not to be confused with the two stroke and four stroke abbreviations as we use them today!!).
I have the feeling that Excelsior may have also developed the three cylinder engine from the twin Villiers engines and I do seem to remember some guy in England building a bike using that 3 cylinder engine.
The Ariel Arrow crankshaft had a simple and ingenious .... cheap? idea for joining the cranks in the middle - it had a taper with a key and was secured with a large allen head bolt
This in turn had to be accessed through the hollow (alternator side) crankshaft half by a long allen screw.
I think that it's main failing was that it was impossible to get the ignition timing just right on each cylinder because as we all know, keys on tapers are not exactly great for accurate location, certainly not as good as splines (but much cheaper).
However it all meant that you could remove the crankshaft without taking the engine out of the bike!
I know all this because it had me flummoxed for a long time before I finally figured it out when I was about sixteen and didn't have a manual!
...... It was all great fun of course and I loved the Arrow, but it could be a very frustrating machine sometimes mainly because of lack of development.
That's what I think anyway.
MUCIEK
I did like that rotary OHV machine from Poland too but all those rotary valves have been in development for probably 80 years. I'm impressed with it's even running and lack of smoke - hope it doesn't eventually disappear! The computer translation from Polish to English isn't really the best but I did get the gist of it!
I see you've got a lot of very talented speedway riders from Poland now!
Strokers Galore!
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