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Thruxton Production Race 1962

Re: Thruxton Production Race 1962

Postby Bernhard » Thu Feb 14, 2013 8:52 am

acotrel wrote:I wonder where they got the pistons for the Aerial Arrow? In those days a few pistons were forged, most were cast. The Japanese developed the machine which spun cast then forged the two stroke pistons, so that the grain flow was better, and they did not seize so easily. I'm amazed that the Arrow was so fast without doing a number on itself. The bike which made me laugh was the Greeves which had a big piston diameter, also they intially used GP carbies with big velocity stacks. After the stack fell off and the bike actually revved out they found themselves with a much quicker bike. One of the guys who started historic racing in Australia smashed the shit out of himself when a Greeves seized in a corner. When Jack Findlay was racing the aircooled TR500, Suzuki lent him a couple of their good pistons, then took them back after he won the GP.


They probably run the 2 strokes with extra piston/bore otherwise known as race clearance, a bigger ring gap and a mixture of Castrol R in the gas tank. T being air cooled, they would have still suffered the odd engine seizure

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Re: Thruxton Production Race 1962

Postby SteveA » Fri Feb 15, 2013 3:24 am

acotrel wrote:
Have a look at Gardner on Fred Walmsley's BSA - there is no such thing as a 'racing line ' ?



Alan, you might understand Waynes lines at Goodwood more if you had been lucky enough to have ridden the place! Ireckon he knows exactly where to be...so that would be the racing line then!

I have driven it in at least 3 cars, a RWD Alfa, an Escort Mexico and a tuned V8 MGB....the place looks straightforward, but it is not...it is very fast, especially the run from Madgewick to Fordwater, and the 'Right Hander before St Marys' as it is always called where Moss crashed in '61....it has 3 double apex bends and those lines do not end up where you expect them to be....and its a lot about placing yourself for something else...

I had the pleasure in the Alfa of running with a gnarly old race instrcutor, once he had talked me out ot the traditional lines we ran a gear higher through some of them....with the inner front wheel aviated!

I also drove a stage rally there in the Escort, unfortunately it ran in reverse direction and had chicanes....good fun in itself, but no chance to get up to a good speed....best fun by far was the V8, only about 250hp, but set up extremely well...
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Re: Thruxton Production Race 1962

Postby acotrel » Fri Feb 15, 2013 1:23 pm

It might appear differently from a bike ?

http://www.youtube.com/watch?v=Z9i4ssiDsRY
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Re: Thruxton Production Race 1962

Postby Bernhard » Fri Feb 22, 2013 7:29 am

acotrel wrote:I think that is the 650CSR, the model on which all the old problems were fixed. The New South Wales police had them in 1963.


A Tom Kirby entered 650CSR ridden by Paddy Driver and Joe Dunphy won the Silverstone “1000” in 1963 beating the Norton’s 650SS.

http://www.vintagebike.co.uk/pictures/t ... dy-driver/

why is there so little about the Silverstone “1000” endurance race on the internet :?:

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Re: Thruxton Production Race 1962

Postby Metalarts » Fri Feb 22, 2013 11:04 am

acotrel wrote:The G45 Matchless was probably the fifties British racer with the most potential. A friend of mine fixed the cam follower problem by using followers from a 650CSR. Some of the guys around here are building replicas using Yamaha XS650 crankshafts, so the drive side oiling problem with the centre bearing is under control. I'd really love to own a 650CSR, they were really good but few were ever sold in Australia. I think a good 500cc version would give a molnar manx a big fright.


Do you have contact information for the people using the xs650 cranks in the G9? I'm interested in this idea as a way to replace broken cranks here in the States.
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Re: Thruxton Production Race 1962

Postby acotrel » Fri Feb 22, 2013 1:24 pm

Ken Lucas in Wangaratta, Australia. I believe the problems with the fifties twin Matchless was related to keeping pressure to the driveside crankshaft bigend. Also the rods used to have a hole to test whether they had stretched by inserting a ground pin, and used to break at the hole. A roller bearing crank such as from an XS650 requires much less oil, and the rods are made of steel. Somebody from this forum once asked me about a foundry in Queensland which is making G45 barrels and heads . If you could get the top end that looks correct , it would be a great motor to play with.

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Re: Thruxton Production Race 1962

Postby Matt Spencer » Fri Feb 22, 2013 6:44 pm

The square cams & triple valve springs had a tendancy ( certainty ) to break the rocker shaft posts of the cylinder head , if ridden in anger .
The dimensions being the same as the Iron Head . Maybe later alloy ones were strengthened there . Modern Valve Spring tecnology would ease
all that .

Capeable of being sorted , but as a off the shelf racer a bit of a disaster . The G - 50 being a lot less bother . Most were converted o singles .
The Japanese response to ' styling ' , was to add more .
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Re: Thruxton Production Race 1962

Postby Matt Spencer » Fri Feb 22, 2013 7:22 pm

Closer to the Road Machine , back then ? note the ' swan neck ' clip-on bars .

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Re: Thruxton Production Race 1962

Postby Bernhard » Sat Feb 23, 2013 7:05 am

Hailwood wins 1965 Hutchinson 100 Production race at Silverstone;

World motorcycle champion Mike Hailwood won the 1965 Hutchinson 100 Production race at the Silverstone racecourse on a BSA Lightning Clubman in heavy rain, beating the Triumph Racing Team's Bonnevilles.[2] The 'Hutch' was the main production race of the season, so it was very important to manufacturers to establish the racing credentials of their latest range. Triumph Bonnevilles were ridden by World Champion Phil Read and ex works rider Percy Tait. BSA Lightning Clubmans were ridden by Grand Prix champion Hailwood (with a large number 1 on the fairing) and factory rider Tony Smith. Conditions were poor and Smith was out of the race at slippery Stowe Corner. With little regard for the rain Hailwood was achieving laps of 83 mph to establish his winning lead.
Ref;

http://en.wikipedia.org/wiki/BSA_Lightning_Clubman

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Re: Thruxton Production Race 1962

Postby beng » Sat Feb 23, 2013 7:51 am

How about some more photos of actual production racers at Thruxton in 1962 or of that specific era? I am sure that G45s and Manx Nortons were not allowed in races for roadsters.....

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Re: Thruxton Production Race 1962

Postby acotrel » Sat Feb 23, 2013 10:15 am

I would love to have more information on the racing in the early sixties. I recently obtained some video of Kel Caruthers riding t he 250 Honda-4 at Phillip Island, however it had no sound track and was very poor quality. I was in my early twenties back then, and we knew about Thruxton production races by reading Brit bike magazines . They were a source of inspiration to those of us who loved to fang a bike.
I'm still searching for early video/film of road racing in Australia, years a go some of the guys had home movies. I know where some of it is, but I've been unable to get my hands on it. Again, I suspect it has no sound track.
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Re: Thruxton Production Race 1962

Postby Matt Spencer » Sat Apr 15, 2017 12:19 am

Some good footage here of Read ?? etc , from 12:00 od , anyway , https://www.youtube.com/watch?v=zM0S_TZEfjY

this and a few others seem to have come on utube recently , if a decades a fairly recent . :wink: look to the right , there .
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