• Welcome to the website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Hon. Editor and Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this website.

    If you have previously registered to use this forum, you should log in now. CLICK HERE.

    If you have never registered to use this website before, please CLICK HERE.

Weight of a Speedway Vincent


Magnetoman

Well Known and Active Website User
VOC Member
In 'Tuning for Speed' Phil Vincent wrote "... the Speedway Vincent engine with standard 66 per cent factor caused severe vibration in a very light dirt-track frame until the factor was reduced to 61 percent, ..." I have two questions I hope someone can answer: 1) is the claimed dry weight of 390 lbs. I found on-line roughly correct for a pre-War Series A Comet, and 2) what was the weight of the Speedway Vincent?
 

A_HRD

Well Known and Active Website User
VOC Member
In 'Tuning for Speed' Phil Vincent wrote "... the Speedway Vincent engine with standard 66 per cent factor caused severe vibration in a very light dirt-track frame until the factor was reduced to 61 percent, ..." I have two questions I hope someone can answer: 1) is the claimed dry weight of 390 lbs. I found on-line roughly correct for a pre-War Series A Comet, and 2) what was the weight of the Speedway Vincent?
The 1936 Series A Comet Special weighed-in at 390lbs plus/minus a little - depending on customer-defined spec. I would therefore estimate close to 400lbs for the std 1936 A Comet.
Peter B
 

david bowen

Well Known and Active Website User
Non-VOC Member
Paul Richardson says some were crankcase alloy and some Magnesium alloy there is a guy in NZ that has a new one never run,I will be there in a few days time I will ask him if he has the weight off the unit, Ian Boyd has one in a series A frame that is alloy crankcases, the Cadwell special is in Lincolnshire UK , there 2 blow up ones in NZ
 

davidd

Well Known and Active Website User
VOC Member
I have wondered about weight because I have always had the feeling that with some of the special engines it is was the way the engines were mounted rather than weight difference that caused the vibration. This seems to be the case in the car engines, which vibrate much more.

Those weights seem very high as my racer with no magnesium except the gearbox (which weighs nearly as much as a stock AMC box) weighs 285 lbs.

David
 

david bowen

Well Known and Active Website User
Non-VOC Member
Andrew Rackstraw New Zealand said when he ran the International in 1992 they were loaned the speedway engine, so members that attended would have seen it.
 

david bowen

Well Known and Active Website User
Non-VOC Member
Pigeon from NZ, just popped in with a message NZ,rally March 23/24 Speedway engine on show 2 series A twins, and a series A Comet, and a 1949 Black Lightning.
 

david bowen

Well Known and Active Website User
Non-VOC Member
Thanks Grey one, I have spoken to Bill Veitch and he will loan the engine to the club for the rally. He said as a young man a guy surname Baker \,raced at Dunedin speedway on a speedway Vincent engine, he was impressed, and he ordered one from Len Perry the NZ Vincent dealer and grey Flash racer Les old Grey Flash is owned by a English guy that lives in Japan.
 

A_HRD

Well Known and Active Website User
VOC Member
Those weights seem very high as my racer with no magnesium except the gearbox (which weighs nearly as much as a stock AMC box) weighs 285 lbs.

David
Don't forget David that the weights I quoted are for the std iron A Comet and TTC (the bronze head on the latter being just as heavy as the iron one on the std - more probably if you add the weight of the brass TT carb and float chamber!). Series A's are way too heavy and there is massive scope to reduce the weight - which I have done with mine.

The A/B Speedway bike will have been much lighter (I have a photo of one somewhere, but not being organised like you are I am unable to find it). My guess is around the low to mid 300s, but It would be interesting to know for sure. Vibration? - probably, yes!

Peter
 
Last edited by a moderator:

david bowen

Well Known and Active Website User
Non-VOC Member
200lb with a JAP a local guy use to carrier on the rear bumper of his Morris Oxford, Vincent motor would be 24lb lighter
 

Top