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Motorcycle racing - Mark and Sam in particular

Motorcycle racing - Mark and Sam

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Former Member18/07/2020 12:28:59

[This posting has been removed]

Graham Titman18/07/2020 13:34:10
132 forum posts
18 photos

Love to read more on the Dave Morris bike and the Suzuki was that when John Reynolds won the British Championship

Steve King 518/07/2020 14:33:14
87 forum posts
95 photos

And me. I raced f1 and f2 side cars for a couple of year i enjoyed the engineer side of it just as much as hanging on the side of the thing.

Oily Rag18/07/2020 15:06:50
540 forum posts
184 photos

The story about Honda was interesting as I was involved in the early days of 'Single cylinder race series' with a rider called Bob Newby. Bob had developed the Mularney Manx Norton which has a history going back to the time when Mike Hailwood was driving in F1 for the Surtee's team. His engines (Cosworth DFV's) were prepared by his Manx engine builder Bill Lacey, an Ulsterman as was Sid Mularney.

Bill Lacey contacted Sid and mentioned that the DFV combustion system would make for an interesting development to the Manx. Sid went ahead and had patterns made to form a Manx cylinder head with the DFV chamber, 4 valves and DOHC. The base engine he used was a 350cc Manx works development bottom end with a one piece crank and a split plain shell rod bearing. On to this went a Cosworth BDX piston to give a 92mm bore. The engine capacity resulted in 485cc with the short stroke of the 350 bottom end.

Bob rode this bike to numerous Classic Racing Motor Cycle Group 1 championships, always engaged in fierce battles with John Cronshaws much modified BSA Gold Star. On the inaugural Single Series championship he was racing what was basically a 1950's era Manx against modern Honda engined Specials. He led the series until the last race at Cadwell Park where he had a poor start but managed to carve his way from the back before crashing on the last lap. Honda officials were at the meeting and when Bob stripped the bike in the paddock to check for crash damage the Honda officials were surrounding him taking photographs.

As you can see in my avatar picture, I also rode in the CRMC Championship with the ex-works BSA as ridden by Bob Heath, Graham Horne and Tony Smith in the late 1960's. These bikes were built and run as 'rolling test beds' for engine development work for the World Moto Cross series with Jeff Smith and John Banks. The BSA mirrored the Mularney Manx by using a single piece short stroke crank, split rod plain shell bearing, but retained the 2 valve layout. It did have a titanium rod and titanium valves though. The BSA revs to 11,000 short of the Manx's 12,500 though!

Former Member18/07/2020 21:48:46

[This posting has been removed]

Graham Stoppani19/07/2020 18:46:07
124 forum posts
26 photos
Posted by Barrie Lever on 18/07/2020 21:48:46:

Finally I will briefly describe the Ducati, it was a 500cc I think but it was a 'V' engine with the second cylinder only working in some kind of balancing capacity,

This is me grinning like a Ceshire cat having ridden one of the handful of road going Ducati Supermonos.

Ducati Supermono Strada

The bike has one cylinder but two con rods. The second con rod is connected to a counterbalance shaft to kid the engine that it is still a V twin. My good friend Alistair Wager of Britaliamoto builds these bikes.

thaiguzzi20/07/2020 09:37:23
704 forum posts
131 photos

Great thread OP!

Keep the stories coming!

Former Member20/07/2020 11:49:43

[This posting has been removed]

Tony Pratt 120/07/2020 12:05:17
1963 forum posts
12 photos

I remember Sid showing me around his workshop located in Leighton Buzzard in the late 60's, he showed me the 4 valve head I think?


Henry Brown20/07/2020 12:07:24
552 forum posts
117 photos

Looking forward to the next thrilling installment Barrie...

Graham Titman20/07/2020 12:40:29
132 forum posts
18 photos

Thanks very much Barrie a very enjoyable read cannot wait for more when Dave was racing he never seemed to get the press coverage he deserved.

Former Member20/07/2020 14:37:01

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