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#30256 - 10/17/07 4:22 pm 250 4 valve twin carb racing single- one off  
Joined: Jul 2005
Posts: 1,919
John RGS Offline
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John RGS  Offline
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new jersey usa
From the archives. And BMS= The first Classic BSA Scene. Text reads as follows:

Four views of BSA's abortive 250 4-valve twin carb racing single, now in the Stanford Hall Museum of Important Motorcycles. A one off, supervised by development engineer Doug Hele and designed by out-going Bert Hopwood, it was to have appeared at Silverstone Saturday, Geoff Duke up, but the managing director of the day demanded a guaranteed win; faced with such an impossible dictum, Hele withdrew the entry. Bevels and a vertical shaft took the ohc drive to one camshaft which then drove the other. The valves were disposed radially. Hele went to join Goldie designer Hopwood returning to Norton in 1956.









,_o
_ -\_<,
(*)/'(*)

NOPGS #2
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#30257 - 10/17/07 7:38 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

BritBike Forum member

Joined: Sep 2002
Posts: 7,812
Seattle
WOW... eek .

Let the "could, shoulda, woulda" begin...


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#30258 - 10/17/07 8:09 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Dec 2006
Posts: 22
DavidT-AKNZ Offline
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DavidT-AKNZ  Offline
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Posts: 22
Auckland NZ
Is this the MC1?


--------------------
'49 A7 500 Star Twin
NZBSAOC #68
--------------------
#30259 - 10/17/07 11:21 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Jan 2004
Posts: 3,518
DMadigan Online content
BritBike Forum member
DMadigan  Online Content
BritBike Forum member

Joined: Jan 2004
Posts: 3,518
ca, us
Yes (MC1). I believe Hopwood credited Hele with the design in his book but probably a colaboration. The cams formed an inverted "V" over the chamber.

#30260 - 10/18/07 5:00 am Re: 250 4 valve twin carb racing single- one off  
Joined: Aug 2001
Posts: 1,099
jfligg Offline
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jfligg  Offline
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Lucan ON Canada
Hi Guys
I think I have video footage of it running at the Sammy Miller Museum. Jeff

#30261 - 10/18/07 12:50 pm Re: 250 4 valve twin carb racing single- one off  
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John RGS Offline
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John RGS  Offline
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new jersey usa
Well put it on youtube so we can check it out! That would be excellent!


,_o
_ -\_<,
(*)/'(*)

NOPGS #2
#30262 - 10/18/07 2:37 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Aug 2001
Posts: 3,348
BONZO R.I.P. Offline
In Remembrance
BONZO R.I.P.  Offline
In Remembrance

Joined: Aug 2001
Posts: 3,348
Michigan, USA
As jeff mention , this bike was featured in the "best o British:BSA" video , a bit of history about it and and the designer as well as Geoff Duke and the had some footage of this beast roaring to life , an incredible sound from a britbike , engine was capable of 11,000 RPM if I recall ... I have no idea how to post to youtube or I'd post it.

FWIW-BONZO

#30263 - 10/18/07 2:50 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Aug 2001
Posts: 1,099
jfligg Offline
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jfligg  Offline
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Joined: Aug 2001
Posts: 1,099
Lucan ON Canada
Hi Guys
I just found the clip. Bonzos right its on the best of british. I dont know how to get VHS onto my computer. Any ideas? Jeff

#30264 - 10/18/07 3:14 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Sep 2005
Posts: 5,963
Ger B Offline
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Ger B  Offline
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Posts: 5,963
NL
My two pennies

web page


Ger B

#30265 - 10/18/07 3:43 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Jul 2005
Posts: 1,919
John RGS Offline
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John RGS  Offline
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Joined: Jul 2005
Posts: 1,919
new jersey usa
Ger, That's worth a couple of euros at least!


,_o
_ -\_<,
(*)/'(*)

NOPGS #2
#30266 - 10/18/07 6:52 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Apr 2006
Posts: 206
Clanger Offline
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Clanger  Offline
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Joined: Apr 2006
Posts: 206
Northants
Funnily enough this has been topical in the Geoff Poyners reminiscences in 'The Star'. In this months issue he covered his time with the MC1 under the direction of engineer Bill Bentley. At this stage (1952) the develpment was headed by Doug Hele who had taken over from Hopwood. To cut a long story short after many months of work they were up to 32 bhp at 11,000 rpm. Not bad for the day!

Cheers Clanger

#30267 - 10/19/07 1:24 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Aug 2001
Posts: 3,408
gavin eisler Online content
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gavin eisler  Online Content
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Posts: 3,408
argyll. scotland, uk
You can rear Roland Pike's (Goldie developer) thoughts on the MC1 here http://www.restorenik.com/daytona/RP_chp_17.htm

the jist was ,
oil drain problems from rockerbox.
Concerns over bevel drive bushings and gear pitch
Under finned .
Comp ratio too high for reliabile running on poor fuel available.
Primary drive problems.
It was not reliable in tests and BSA/ Hele dropped it without further developement.

Shame
Cheers
pod


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#30268 - 10/19/07 3:25 pm Re: 250 4 valve twin carb racing single- one off  
Joined: Sep 2005
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Ger B Offline
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Ger B  Offline
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Joined: Sep 2005
Posts: 5,963
NL
I wonder: did it inspire Aermacchi to develop the Ala Verde and Ala d'Oro?


Ger B

#30269 - 10/23/07 2:50 am Re: 250 4 valve twin carb racing single- one off  
Joined: Feb 2007
Posts: 2,200
Semper Gumby Offline
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Semper Gumby  Offline
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Posts: 2,200
Atlanta, GA USA
Hey Pod, MarkB, RFW et al.

Aparently Roland Pike was not a big fan of the timing side bush either!! Hmmm....

Interesting read!!!!!


Gaggle of BSAs
a Honda
an old BMW
and a Montesa
Parking lot Elf in training

Moderated by  Allan Gill, Jon W. Whitley 


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