Norton
Manx Gallery
Bracebridge Street
had prepared a new single cam over the counter
racing motorcycle for the 1939 season, unfortunately
the release was delayed due to the international
situation, with the new model eventually becoming
available during 1946. The machine continued
in its initial form, with "Roadholder"
forks and plunger rear suspension until 1949
and the introduction of the "double knocker"
engine. 1950 saw the works riders mounted on
machines equipped with a new frame designed
by Rex McCandless which was quickly dubbed the
"featherbed". The new pivoted fork
frame retained the Norton "Roadholder"
forks and a revised production Manx incorporating
the new frame became available to the paying
public for the 1951 season. Detail development
occurred over the course of the next two seasons
with modifications proven on the works machines
being incorporated into the following season's
production models.
Bike |
Image |
Description |
1937 Norton Manx 500 cc |
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More Manx Norton
info.. |
Norton 500 Manx |
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Production - 1946-1953 (long-stroke),
1953-1962 (short-stroke)
Engine - double overhead-cam, single-cylinder
four-stroke
Bore and Stroke - 79.6 x 100 mm (1946-1953),
86 x 85.6 (1953-1962)
Capacity - 499cc
Power - 50bhp @ 7200rpm
Wheelbase - 56in
Top Speed - 150mph (depending on gearing)
Picture kindly provided by www.classic-motorbikes.com
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1946 Norton Manx |
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1948 Norton Manx 30M
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The rear end of the frame utilised
a plunger suspension system, whilst the
front featured telescopic forks of Norton's
own design bearing the trademark "Roadholder".
Conical steel hubs were laced to alloy
rims. Named the Manx 30M and offered alongside
a 350cc model typed the 40M, the new model
quickly established itself as a force
to be contended with in competition and
remained largely unchanged for the next
two years. For the 1949 season a revised
engine design was adopted featuring a
double overhead cam top end. 1949 also
saw the introduction of alloy conical
hubs and tanks. The two models continued
in this form until they were replaced
by "featherbed" framed versions
in 1951, the prototypes of which having
competed during 1950 in the hands of the
works riders.
Image provided by www.classic-auctions.com.
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1949 Norton Manx 30M
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1950 Norton Manx |
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1952 Norton Manx 30M
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1952 Norton Manx 40M
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Norton had been developing a dedicated
racing motorcycle derived from the International
for the 1940 season. The advent of the Second
World War delayed the new models introduction
until 1946. Dubbed the Manx by the company,
although it had originally been intended
to call the new model the International
Manx, the new racing model utilised a rolling
chassis that owed its design to the pre-war
factory machines. Norton "Roadholder"
telescopic front forks and a plunger rear
suspension system were employed. A single
overhead cam engine again derived from the
pre war racing model was employed in either
350cc or 500cc capacities. 1949 saw the
introduction of the double over cam engine,
however, the most significant change occurred
during 2007 with the adoption of the Rex
McCandless designed "featherbed "
frame which had been used during the previous
season by the works team. |
1954 Norton Manx 30M
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Image provided by www.classic-auctions.com.
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1955 Norton Manx 500 cc |
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1957 Norton Manx |
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1959 Norton Manx 500 cc |
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1960 Norton Manx 30M |
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The 1954 Manx established the design
for the machine that would continue, with
detail developments, to the end of the
models production in 1962. The frame adopted
a welded on sub-frame and the front brake
became a twin leading shoe design.The
engine dimensions were changed to 86 x
85.8mm for the 500cc version (76 x 76.85
for the 350cc). Larger valves and a shortened
con-rod were employed in the engine whilst
externally the cam drive tube was housed
within the finning of a new cylinder head
that was graced with revised fining. From
1955 the factory team used production
based machines incorporating developments
intended for the following seasons production
models rather than "works specials"
as had previously been the case. Whilst
this may have been detrimental to the
works riders at the highest levels of
international competition it undoubtedly
was of benefit to privateers at all levels,
developments proven by the factory team
were incorporated into the customer machines
for the following season starting with
the 1956 models.
The developments incorporated into the
1956 machines included a revised timing
side bearing and extended primary drive
guard, 1957 saw the introduction of a
sleeved big end, a larger carburettor
and subtle revisions to the cycle parts.
The major change for 1958 centred on the
transmission with the AMC gearbox being
fitted and was followed in 1959 with detail
revisions to the clutch and engine which
benefited from further revisions for 1960
and 1961.
This example was owned by Mike Hoskisson
of Bee-Bee Racing and ridden by Alistair
Frame and Malcolm Lucas in the Manx Grand
Prix. The 1957 specification engine using
new, original, crankcases and a BTH magneto
was the last one built by Ray Petty in
1985 and is installed in a 1960 frame.
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1961 Mckintosh Manx 30M
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This example of the 500cc Manx is based
on a 1961 "lighthouse tower" twin
cam model. The original engine was rebuilt
using a set of Summerfield crankcases by
well known Manx specialist Phil Kettle for
Harry Whitehouse. The chassis is a Mackintosh
example conforming to 1961 specifications.
An Oldani front brake and a five speed gearbox
complete the machine. |
1962 Norton Manx 40M
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This example was completely rebuilt
by renowned tuner Ray Petty during 1972,
at which time an ex Reg Dearden/ex Norton
race Shop engine was fitted, numbered
with Ray Petty's own stamping. The engine
was equipped with an outside flywheel
and a titanium con-rod and breathed through
an Amal 1 3/8th inch GP2 carburettor fitted
using a specially manufactured venturi.
Whilst in Mr Petty's ownership it was
ridden by Derek Minter, Dan Shorey and
others. In 1988 it was sold to Adrian
Sellers who retained it until 1997 when
it moved into the vendor's ownership.
During the next nine years it was raced
at most of the British mainland circuits,
at the Dundrod Ulster Grand Prix and in
the INCA series during 2000. When not
racing in Europe the machine was campaigned
by the vendor in the North American AHRMA
series between 1998 and 2006, notably
securing a 5th place finish in the March
2006 Premier Race at Daytona and taking
fourth overall with its rider in the 1999
AHRMA National Championship in 1999.
Image provided by www.classic-auctions.com.
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Barry Sheen Manx Raplica |
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Neville Evans Replica Manxman |
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500cc SOHC Manxman with a bore of 85
mm and a stroke of 88 mm, produced by
Neville Evans of Manx Engineering at Port
Talbot in 1990.
- Engine Standard Manxman with P.A.L
magneto and Gardner 35 mm carburettor
with remote float chamber.
- Frame Standard Manx replica of Reynolds
531 tubing with oval swinging arm to
facilitate WM3 rim.
- Tanks To Manx spec, fuel 4 ¾
gallons, painted and lined, oil tank
painted and lined to match
- Gearbox 4 speed close ratio
- Exhaust Low level as on 1960 Manx,
chromed with flat in megaphone
- Rear Chain 1/4” X 5/8”
(110054)
- Primary Drive Bob Newby belt
- Front wheel 19” WM2 alloy rim
with 230 mm four leading shoe Gremeca
hub painted black
- Rear wheel 19” WM3 alloy rim
with conical hub painted black
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