1954 TRIUMPH THUNDERBIRD


Triumph Thunderbird, Triumph Tiger T110, Triumph motorcycles

The 1954 Triumph Thunderbird & the 1954 Triumph Tiger were "sister-bikes", in that they were very similar in appearance. In this era of Triumph Motorcycle history, the Tiger was always the "hot rod"-version, with higher compression, wilder cams & bigger carbs, be it in 500cc form as the T100, or 650cc form as the T110. The 6T Thunderbird line then, was given milder tuning & was relegated to touring & commuter duty. We don't have a photo of a 1954 Triumph Thunderbird, so we were forced to use this lovely Tiger T110.




1954 TRIUMPH THUNDERBIRD - A BIG YEAR
1954 was a big year at Triumph Motorcycles, in general. Finally the archaic rigid frame & troublesome sprung rear hub were ditched for a proper swing arm frame. Not a moment too soon, either. AMC, Royal Enfield & the BSA Gold Star were already running swing arms & Norton was about to introduce the swingarm-equipped Norton Dominator with the legendary Featherbed Frame. Triumph had some catching up to do. This would prove to be a year of change for the Triumph motorcycle line.

1954 TRIUMPH THUNDERBIRD & THE NEW TIGER T110
1954 was also the year Triumph introduced the hot new Triumph Tiger T110. The new top 650 model was the high-performance variant & it's development trickled down to the other models. The Tiger T110 featured higher compression, wilder cams & a bigger carb, and still ran a magneto, offering much more performance. The 1954 Triumph Thunderbird, once the flagship of the Triumph Motorcycle line & the fastest bike they produced, was now marketed as the detuned, commuter (or 'plodder') version, although the two bikes continued to be styled almost identically.

1954 TRIUMPH THUNDERBIRD - RESTYLED
The 1954 Triumph Thunderbird was extensively restyled, as were all Triumphs, with a new look that somehow retained its historical relevance with Triumphs past. They looked great! A new color, Shell Blue Sheen (pictured here on the 1954 Tiger T110) was striking on the new bikes.

Triumph Tiger T110, Triumph Thunderbird, Triumph motorcycles, Triumph

This 1954 Triumph Tiger T110 shows the new Shell Blue Sheen paint color. The '54 T110 differed from the 1954 Triumph Thunderbird in that that Tiger had a hotter engine & it retained the magneto & dynamo, whereas the T-Bird had the new-fangled alternator & coils.




1954 TRIUMPH THUNDERBIRD - SOUPED-UP 650
Performance also got a big shot in the arm for the 1954 Triumph Thunderbird. The entire Triumph 650 line got a stiffened crankshaft with increased shaft diameters, larger conrods & a new crankcase with larger 1-1/8" MS11 ball race on the timing side. Revisions to the primary cases were made to accommodate the new Lucas RM14 3-lead alternator.

1954 TRIUMPH THUNDERBIRD - NEW SWINGARM FRAME
The new swingarm frame shortened the wheelbase by 1-inch, to 55-3/4". It was a single front downtube with the swing arm pivot mounted to the saddle tube & nothing else. The vertical saddle tube flexed like a torsion bar, allowing the swing arm to move sideways. This would end up being a real problem on the higher performance Triumph Tiger T110 & much later on the first year 1959 Triumph Bonneville. Because of this tendency to weave, the frame gained the nickname "Whip Iron".

1954 TRIUMPH THUNDERBIRD - GEARING
The engine package was also made more compact by pushing the gearbox closer to the crankcase & shortening the primary cases. The primary chain was down to 70 links. Out back, the lower half of the chain guard was deleted. The gearbox cases were modified along with a new adjusting (rotating the gearbox in its mounts as the only means of adjusting the primary chain tension) & clamping system. The gear indicator pointer was also dropped.

1954 TRIUMPH THUNDERBIRD - RUNNING GEAR
Front fork springs were lengthened to 20 inches & rear shocks were 3-position slim-bodied Girlings with 110lb springs early in the year & 125lb springs mid-year on. A centerstand appeared for the first time ever on a Triumph motorcycle.

Triumph Tiger T110, Triumph Thunderbird, Triumph motorcycles

Again, our pretty Tiger T110 sits in for a 1954 Triumph Thunderbird. The new swingarm rear suspension & Girling shocks are visible here. One key difference in appearance between the Tiger & the T-Bird is the primary covers. The 1954 Triumph Thunderbird had an alternator which required a larger bulge in front than this.




1954 TRIUMPH THUNDERBIRD - NEW BODYWORK
The new frame called for many new parts, including a new oil tank (claimed to be 6 pt, but was actually only 5) which also housed the battery tray, air cleaner & tool box. As always, the 6T Thunderbird came with well-valanced fenders, a new stepped two-place seat & headlight nacelle.

1954 TRIUMPH THUNDERBIRD - COOKING MODEL
With the introduction of the red-hot T110, the 6T T-Bird was no longer the top model. Starting with the 1954 Triumph Thunderbird, it became relegated to what the Brit's call a "cooking model", or basic commuter, and sidecar duty, pretty much from then on for the rest of its career. Until the arrival of the Triumph TR6 in 1956, then the Triumph Bonneville in 1959, the Tiger T110 was the 'hot rod' model, chruning out 42hp & easily breaking "the ton" (100mph). This all lead to overheating problems in the T110 that didn't affect the 6T as much, because of its lower performance. The changes that were made to the T110 to solve its problems trickled down to the rest of the line, including the 6T Thunderbird.


1954 Triumph Thunderbird SPECIFICATIONS:




MODEL DESIGNATIONS:
1954 Triumph Thunderbird 6T...................... Roadster

ENGINE:
Engine type....................................... OHV vertical twin
Horsepower at RPM............................ 34 BHP @ 6,500 rpm
Bore................................................ 71mm / 2.79"
Stroke............................................. 82mm / 3.23"
Displacement.................................... 649cc / 40 cu. in.
Compression Ratio
Home Market (UK).................................. 7.0:1
Export Market (US)................................ 8.5:1
Valve Clearance (cold):
Inlet................................................ 0.05mm / 0.002"
Exhaust............................................ 0.10mm / 0.004"
Valve Timing:
Inlet Valve Opens.............................. 34 degrees BTDC
Inlet Valve Closes.............................. 55 degrees BTDC
Exhaust Valve Opens.......................... 48 degrees BTDC
Exhaust Valve Closes.......................... 27 degrees BTDC

IGNITION:
Spark Plug Gap.................................. 0.50mm / 0.020"
Timing (fully advanced):
Crankshaft position............................. 39 degrees BTDC
Piston position................................... 11mm / 7/16" BTDC

CARBURETORS:
Type................................................ SU Type MC2

TRANSMISSION:
Speeds.............................................. 4
Gear Ratios:
4th - Top........................................... 4.88
3rd - Third......................................... 5.81
2nd - Second...................................... 8.25
1st - Bottom...................................... 11.9
RPM @ 10MHP in Top Gear................... 638 RPM

CLUTCH:
Type................................................ Multi-plate, wet
Number of Plates:
Drive Plates...................................... 6
Driven Plates.................................... 5
Friction Material................................ Cork

SPROCKETS:
Engine............................................. 24 teeth
Clutch............................................. 43 teeth
Gearbox.......................................... 18 teeth
Rear Wheel...................................... 46 teeth

CHAIN:
Primary, pitch.................................. 1/2" X .335" X 5/16"
Primary, length................................. 70 links
Final Drive, pitch............................... 5/8" X .400" X 3/8"
Final Drive, length............................. 101 links

CAPACITIES:
Fuel (US versions)............................. 3 Imp. gal.
Fuel (UK & export versions)................. 4 Imp. gal.
Oil Tank........................................... 5 pints / 3 L
Gearbox........................................... 2/3 pt / 400cc
Primary Chaincase............................. 1/4 pt / 150cc
Front Forks....................................... 1/4 pt / 150cc

TIRES:
Front............................................... 3.25 X 19"
Rear................................................ 3.50 X 19"

SUSPENSION:
Front............................................... Telescopic Forks
Rear................................................ Swing arm

BRAKES:
Front............................................... 8" / 20.32cm SLS
Rear................................................ 7" / 17.78cm SLS

DIMENSIONS:
Seat Height...................................... 31" / 77.5cm
Wheelbase........................................ 55.75" / 140.3cm
Length.............................................. 86.25" / 219cm
Width............................................... 28.5" / 72cm
Ground Clearance.............................. 5" / 12.7cm
Dry Weight, unladen............................ 395 lbs / 179kg


TRIUMPH MOTORCYCLE BOOKS


TRIUMPH RESTORATION, PRE-UNIT

TALES OF TRIUMPH & MERIDEN

TRIUMPH MOTORCYCLES: TRIUMPH ENGINEERING CO.

TRIUMPH WORKSHOP MANUAL, 1935-1939

TRIUMPH WORKSHOP MANUAL, 1937-1951

TRIUMPH WORKSHOP MANUAL, 1945-1955

TRIUMPH MOTORCYCLES: FROM SPEED TWIN TO BONNEVILLE

TRIUMPH MOTORCYCLES - HINKLEY RENAISSANCE

SAVE THE TRIUMPH BONNEVILLE

THE INSIDE STORY OF THE MERIDEN WORKERS' CO-OP.
STORY OF THE TRIUMPH BONNEVILLE - MOVIE

TRIUMPH 650 & 750 TWINS

ESSENTIAL BUYERS GUIDE TO TRIUMPH BONNEVILLE

TR BONNEVILLE 2001-08

TR BONNEVILLE, PORTRAIT OF LEGEND

TR BONNEVILLE: T120/T140

TRIUMPH MC RESTORATION

HAYNES TR TRIPLES & FOURS

TRIUMPH 21 TO DAYTONA

TRIUMPH TIGER CUB BIBLE

Triumph Thunderbird
Triumph Thunderbird, Pre-Unit
Triumph Thunderbird, Unit Construction

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