|
| |
Now that we
have signed an agreement to distribute the
range of high quality SRM components, we have discontinued
subcontracting BSA crank conversions to our USA machinist and are referring
customers interested in this job to contact SRM directly instead.. Our
agreement with SRM covers parts only, not service work, but we do not
wish to compete with our supplier on this conversion.
Please contact SRM 
in Wales directly.
Please click on the logo to go directly to their site.
(Information below for reference only)
BSA
CRANK CONVERSION
Though many high-performance automotive engines are equipped with
plain
main bearing crankshafts, some are of the opinion that this type of
crank is the Achilles heel of the BSA unit twin motorcycle engine.
The BSA racing department experimented successfully with roller main bearing
cranks in the 60s and 70s, and for years companies in England have
offered a service to convert the right hand crankshaft bushings on
A7, A10, A50, and A65 to radial thrust needle bearings. This allows better
control of end play, as well as end feed of the oil to the crank
through an oilseal as on Nortons and most Triumph twin, allowing longer
engine life. The big downside of sending heavy parts to England for
North American customers, though, has been the huge cost of shipping
back and forth, making this conversion quite un-economic, to say
the least. As a result, very few engines have been modified this way
by USA and Canadian BSA riders.
British Cycle Supply Company is now subcontracting this modification to
an expert American machinist so we can offer this service at a realistic
price and turnaround time.
The conversion is available two ways for the unit twins:
a) Hidden conversion: This does not change the appearance of the engine
at all, and feeds the crank via hidden oilways under the timing cover.
b) Outside conversion: This has a flexible oilfeed hose going from the front
of the engine around to the timing cover to feed the end of the crank,
a more economical way of achieving the same thing as the hidden conversion,
and mechanically exactly the same.
The preunit twins are only available as a hidden conversion.
We require the customers clean bare crankshaft, RH crankcase, and inner
and outer timing covers.
Canadian customers can ship the required components to our Canadian warehouse,
and we will save you cross border shipping charges by transporting
back and forth from the USA in our company Diesel truck
for free.
US customers should ship directly to our US warehouse at 146 Porter Street,
Hackensack, New Jersey, 07601.
Parts should be carefully packed in a very sturdy box or crate to avoid
damage, fully insured. We will return to you in the same box when
the work is complete, and can supply any other requested items such
as gasket, seals, pistons, etc. at that time to allow completion of
engine assembly.
PLEASE ALLOW AT 90 DAYS FOR PROCESSING AND SHIPPING. WE CAN SHIP BY FASTER
METHODS IF TIME IS OF THE ESSENCE, AT EXTRA COST.
|
