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Monobloc for a 1955 VB

Posted: Wed Feb 21, 2018 10:16 am
by klaus gerhard
My friend Robert wants to fit a new monobloc to his 1955 VB. What he now needs is the distance piece between the carb and the barrel. Drags don't have them. Can anybody help?

Thanks very much.
Klaus

Re: Monobloc for a 1955 VB

Posted: Wed Feb 21, 2018 11:23 am
by chris.shearwood
Hi Klaus,
Would a Tufnel spacer from Surrey Cycles do the job?

https://surreycycles.com/product/tufnel-spacers/

Regards, Chris

Re: Monobloc for a 1955 VB

Posted: Wed Feb 21, 2018 11:34 am
by Eero.Korhonen
I think 1/2" would be enough, but it is best to measure before ordering.
Br, Eero

Re: Monobloc for a 1955 VB

Posted: Wed Feb 21, 2018 1:25 pm
by klaus gerhard
Thanks Chris ans Eero,
VBs had an Amal carb with a longer manifold before they were fitted with the monobloc in ca 1955. To keep the carb away from the magdyno, a alloy spacer was used of I guess 4-5 cms. This is what Robert needs. (see Postwar Models page 96)
Regards Klaus

Re: Monobloc for a 1955 VB

Posted: Wed Feb 21, 2018 1:39 pm
by Eero.Korhonen
Ok, those are not enough then, max is 3/4" that is 19 mm.
Br, Eero

Re: Monobloc for a 1955 VB

Posted: Sun Mar 18, 2018 11:26 pm
by allan burgess
598 VB 1955-58 376/13 ---- mix chamber body no 376/002 bore 1' ----centre line of body to face of flange 1.1/2 "hole centre's 2" holes dia 11/32" ---bore------dia at engine end =1" jet block 376/056 . jet 220 pilot 30 throttle valve 376/5 needle position 2 needle jet 106 Mono block this info may Help

Re: Monobloc for a 1955 VB

Posted: Mon Mar 19, 2018 8:40 am
by klaus gerhard
Thanks Allan,
good to know about the Monobloc details. Whats needed most is the distace piece between the carb and the barrel.
Thanks Klaus

Re: Monobloc for a 1955 VB

Posted: Mon Mar 19, 2018 10:02 am
by allan burgess
I have a VB carb? body the correct one with the extended neck in fact a choice of two but without the float chambers

Re: Monobloc for a 1955 VB

Posted: Mon Mar 19, 2018 12:26 pm
by brian.ashley
I have a '55 VB with the original spacer between carb and barrel. Would you like me to photograph it and send you measurements?

Re: Monobloc for a 1955 VB

Posted: Mon Mar 19, 2018 8:37 pm
by klaus gerhard
Brian,
that would be very kind of you!
Thanks very much
Regards Klaus