radial 4 valve head? - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 15 (permalink) Old 10-24-2001, 12:41 AM Thread Starter
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radial 4 valve head?

Which production bike was the first one to have a radial 4 valve head?
Hint: It was long before Honda's RFVC

Aris
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post #2 of 15 (permalink) Old 10-24-2001, 08:36 PM Thread Starter
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Is it too hard?

OK just let me know if anybody wants the answer.
Aris
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post #3 of 15 (permalink) Old 10-25-2001, 11:14 AM
 
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Ducati 851
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post #4 of 15 (permalink) Old 10-25-2001, 07:49 PM Thread Starter
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The 851 was one of the early 4 valve Ducatis but the valves were positioned in parallel and not radially.
The bike I 'm looking for is much older also...
Aris

Here's the 851 head:
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post #5 of 15 (permalink) Old 10-25-2001, 08:16 PM
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Re: radial 4 valve head?

Quote:
Originally posted by ariszr7
Which production bike was the first one to have a radial 4 valve head?
Hint: It was long before Honda's RFVC

Aris
Aris,

Yes, like yourself I have no life outside of motorcycles.

It was the BSA MC1

So what do I win?

Here is a pic.
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post #6 of 15 (permalink) Old 10-25-2001, 08:43 PM Thread Starter
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Re: Re: radial 4 valve head?

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Originally posted by Robert


Aris,

Yes, like yourself I have no life outside of motorcycles.

Nice try Robert

I'm sorry that your life is like mine
My problem is that I'm in Germany and my bikes are in Greece

Anyway, you don't win anything because it's not the correct answer.
I made a little investigation on the BSA (great bike!).

'The MC1 was one of BSA's best kept secrets. It was a double-overhead cam 4-valve racer built in the Small Heath Experimental Department. Like some later singles, it took advantage of its multi-valve configuration to use two carbs and two exhaust pipes. Only one machine, this one, was made because factory management refused to let it race unless a win could be guaranteed. Again note the engine is mounted low and forward, like two other racers mentioned above.'

So it wasn't a production bike (1 made) and it didn't have radial valve arrangement.
Do you want the correct answer? I can give it to you, or you want to keep on trying ?

Aris
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post #7 of 15 (permalink) Old 10-25-2001, 08:48 PM
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Re: Re: Re: radial 4 valve head?

Quote:
Originally posted by ariszr7
So it wasn't a production bike (1 made) and it didn't have radial valve arrangement.
Do you want the correct answer? I can give it to you, or you want to keep on trying ?

Aris
DOH! I'm getting ready to go to bed. But I'd like to think about it some more and submit a new answer tomorrow.

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post #8 of 15 (permalink) Old 10-25-2001, 09:03 PM Thread Starter
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Yeah! Sleep over it

I just came to work a couple of hours ago...
I 'm not working tomorrow, so no internet. I'll review your answers on Monday

Hint: you are getting closer with the BSA MC1, both for the time and the country! (this should be helpful)

BTW. check the url for listening to the Honda RC149 (and many other crazy Hondas) on the 5 cyl thread, it's worth it!

sleep tight

Aris
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post #9 of 15 (permalink) Old 10-30-2001, 05:23 PM
 
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Hi Aris,

Is it the 1935 Rudge Whitworth model Ulster 250 cc. Made in England.





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post #10 of 15 (permalink) Old 10-30-2001, 08:08 PM Thread Starter
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ZR7 team!

Hi Andy,
You 're Andy Bajka aren't you?
Of course you re absolutely right! I thought noone would get this but it seems you ride the right bike for my questions!
So tell me what do you want to win??

In fact the picture of the bike is not right. The picture (from http://www.rudge.ndirect.co.uk right?) shows the 500cc Ulster which had the full radial head only in 1932 and then got the 'semi radial' which means only the inlet valves were radially positioned while the exhaust were parallel. The 250 appeared in 1931 and continued with the full radial layout until 1936 with the 'Sports' model .

Check this: http://www.stratford-rudge.co.uk/engine.htm to see the drawings of the engine, it's really good!

Here is a picture of the 250 bike with the full radial head:

Just tell me, did you know the Rudge history, or did you get it with a google search?

Aris
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Last edited by ariszr7; 10-30-2001 at 08:14 PM.
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