Oddball engines and prototypes

[nadroj]

Wanganui 2012

[crbbt]

Thanks Husa!

I was under the impression that opening up the angle on the V4's was for carb fitment.

and on a counter rotating twin crank (with the cylinders firing at the same time) was just what ever mood the designer was in with maybe some thought towards the resultant force and its magnitude

[husaberg]

Thanks Husa!

I was under the impression that opening up the angle on the V4's was for carb fitment.

and on a counter rotating twin crank (with the cylinders firing at the same time) was just what ever mood the designer was in with maybe some thought towards the resultant force and its magnitude

Carb and airbox room is my understanding, as the cylinders are closer in the twin cranks but the single crank has more room.
I seen a pic the other day that suggests to me, the Yams only actually breathed through 4 petals of the 6 petal reeds.

[Frits Overmars]

This is my Fav Narrow angle V set up the Derbi 125.

That's not a V-engine at all Husa; it's two engines sharing a common gearbox, chassis and rider. If there's more than one crankshaft, it's more than one engine .
By the way, if you like that Derbi so much, you must also like its spitting image, the 125 cc aircooled Jawa twin. I wonder which one was first. I tried to find a picture of it, but no luck.

[Grumph]

The Jawa was one of several projects the factory had going in '66 - appearing in '67. The 250 single production racer,250 parallel twin,revised 350 twin, 350 version of the V4 - and the 125 v twin.
First information on the 125 was released in April '67.
At Derbi, race chief Tombas constructed an "unofficial" prototype 125 V twin in 1967.

From Mick Walker's Classic European Motorcycles....

There are a couple of good pics of the Jawa too, neater than the Derbi IMO. I'll put them up when i have more time. Later today i hope.

[Grumph]

Pic as promised.
I first saw this book - a $2 secondhand shop purchase - around the time I was doing a batch of Suzuki A50 engines for a collector.
Made me think...

[WilDun]

I can't remember that Jawa, it does remind me of the Villa Bros. original 4 cylnder racers though. There was a period around then that I had lost touch with the European scene.

Pity about Jawa and all the restrictions they had imposed on them in those days (stifled, just like MZ.) - and in the days when it was all happening too.

Watched the speedway in Poland the other night and it seems that Jawa has carved a niche in that branch of motorcyclle racing!
I really should have tried speedway when I was young, very exciting stuff I reckon! unfortunately it's all four strokes and always has been.

[WilDun]

Wanganui 2012

Just be happy you can still see it I reckon!

[tjbw]

Anyone remember this Arisco, with Tapias engine?

I found it in a little motorcycle museum in Barcelona.

It also has two cylinders, with very little inclination, and two crankshafts.

Other side can be seen here:
https://commons.wikimedia.org/wiki/C...0cc_1977_b.JPG

[husaberg]

That's not a V-engine at all Husa; it's two engines sharing a common gearbox, chassis and rider. If there's more than one crankshaft, it's more than one engine .
By the way, if you like that Derbi so much, you must also like its spitting image, the 125 cc aircooled Jawa twin. I wonder which one was first. I tried to find a picture of it, but no luck.

The Jawa was one of several projects the factory had going in '66 - appearing in '67. The 250 single production racer,250 parallel twin,revised 350 twin, 350 version of the V4 - and the 125 v twin.
First information on the 125 was released in April '67.
At Derbi, race chief Tombas constructed an "unofficial" prototype 125 V twin in 1967.

From Mick Walker's Classic European Motorcycles....

There are a couple of good pics of the Jawa too, neater than the Derbi IMO. I'll put them up when i have more time. Later today i hope.

The Debri was only sporadically developed. Which was a shame.
I know of and have plenty of pics of the Jawa, but, alas its not my fav make as one Killed Bill Ivy.
Pretty sure one of them later morphed into the Moto Villa as well.


This is the 250 4, but there was a 125 narrow angle 2 as well.
More stuff to follow later, if I can be bothered.

I have a pic somewhere of a Bultaco tandem twin 250 kart engine, that likely predates the Rotax by a decade.

[Frits Overmars]

I really should have tried speedway when I was young, very exciting stuff I reckon! unfortunately it's all four strokes and always has been.

Well, almost, Will. Would you accept dirttrack as an alternative?
http://www.youtube.com/watch?v=8k8hJWKIVNs

[Frits Overmars]

I have a pic somewhere of a Bultaco tandem twin 250 kart engine, that likely predates the Rotax by a decade.

Been there, never heard of it. You made me very curious Husa.

[husaberg]

Been there, never heard of it. You made me very curious Husa.

I will have a go at finding it.
It was on a historic kart site along with some real oddball stuff.

Okay my memory is playing tricks
Whoops its a Guazzoni But it was directly under a Bultacco in my defence.

http://www.trhkc.com/engines-2.html

oh its 200CC

http://www.kartbook.net/photo/photo/...=&xgi=&page=7#
I bet it was better than a 9E villiers

[Grumph]

I bet it was better than a 9E villiers

Oh, I don't know, the last time we had my Villiers special out - one of the Cust revival meetings - it caught and passed three 250 Ducatis....

Before seizing.....

I should probably get it going again, the rules allow it to go on alky now but I'd also want to do a belt primary, better ignition...etc etc....

[WilDun]

Well, almost, Will. Would you accept dirttrack as an alternative?

Yes that long track stuff is very exciting and Kenny Roberts is a very brave man for tackling it on a TZ750! - especially at his age.
Yes it would have interested me alright, I always liked to slide bikes around at speed sitting upright.
I could also go quite fast on the tarseal, ie for the first few laps then I either started to slow (tired out) or fell off, so the European type speedway would have suited me better, but those US guys sure had some skills! - 20 laps? not for me.

That little Spanish tandem twin looks like a neat package, but it doesn't ring a bell with me.

Husa, are you sure that it wasn't the Villa which morphed into the Jawa powerplant?
Pity about poor old Bill Ivy though - I think he let Phil Read get under his skin.
Read was good as a rider of course, but I've heard that he was not terribly popular otherwise.
That incident put Jawa out of the running as far as road racing was concerned, just as the death of Santiago Herrero in the IOM TT put Ossa out of business.