Styling and coachwork
The new TR4 body style did away with the classical cutaway door design of the previous TRs to allow for wind-down (roll-up) windows (in place of less convenient side-curtains), and the angular rear allowed a boot (trunk) with considerable capacity for a sports car.
Advanced features included the first use of adjustable fascia ventilation in a production car and the option of a unique hard top that consisted of a fixed glass rear window (called a backlight) with an integral rollbar and a detachable, steel centre panel (aluminium for the first 500 units). This was the first such roof system on a production car and preceded by 5 years the Porsche 911/912 Targa, which has since become a generic name for this style of top.
On the TR4 the rigid roof panel was replaceable with an easily folded and stowed vinyl insert and supporting frame called a Surrey Top. The entire hard top assembly is often mistakenly referred to as a "Surrey Top". In original factory parts catalogues the rigid top and backlight assembly is listed as the "Hard Top" kit. The vinyl insert and frame are offered separately as a "Surrey Top".
Features such as wind-down windows were seen as a necessary step forward to meet competition and achieve good sales in the important US market, where the vast majority of TR4s were eventually sold. However, dealers had concerns buyers might not fully appreciate the new amenities so a special short run of TR3A (commonly called TR3"B") were produced in 1961 and '62.
As of Q1 2011 there were approximately 739 licensed and 138 SORN TR4s registered with the DVLA.
The pushrod 4-cylinder engine based on the early design of the Ferguson tractor engine, was continued from the earlier TR2/3 models, however the displacement was increased from 1991 cc to 2138 cc in the TR4 by increasing bore size. Gradual improvements in the manifolds and cylinder head allowed for some improvements culminating in the TR4A model. The 1991 cc engine became a no-cost option for those cars destined to race in the under-two-liter classes of the day. Some cars were fitted with vane-type superchargers, as the three main bearing engine was liable to crankshaft failure if revved beyond 6,500 rpm. Superchargers allowed a TR4 to produce much more horse-power and torque at relatively modest revolutions. The standard engine produced 105 bhp (78 kW) SAE but supercharged and otherwise performance-tuned a 2.2-litre I4 version could produce in excess of 200 bhp (150 kW) at the flywheel. The TR4, in common with its predecessors, was fitted with a wet-sleeve engine, so that for competition use the engine's cubic capacity could be changed by swapping the cylinder liners and pistons, allowing a competitor to race under different capacity rules (i.e., below or above 2 litres for example).Standard inline-four engine
Other key improvements over the TR3 included a wider track front and rear, slightly larger standard engine displacement, full synchromesh on all forward gears, and rack and pinion steering. In addition, the optional Laycock de Normanville electrically operated overdrive Laycock Overdrive could now be selected for 2nd and 3rd gear as well as 4th, effectively providing the TR4 with a seven-speed manual close ratio gearbox.
TR4 were originally fitted with 15x4.5" disk wheels. Optional 48-lace wire wheels could be ordered painted the same colour as the car's bodywork (rare), stove-enamelled (matte silver with chrome spinners, most common) or in matte or polished chrome finishes (originally rare, but now more commonly fitted). The most typical tyre originally fitted was 165x15 bias ply. In the US at one point, American Racing alloy (magnesium and aluminium) wheels were offered as an option, in 15x5.5" or 15x6" size. Tyres were a problem for original owners who opted for 48-spoke wire wheels, as the correct size radial ply tyre for the factory rims was 175x15, an odd-sized tyre at the time that was only available from Michelin at considerable expense. The much more common 185x15 radials were too wide to be fitted safely. As a result, many owners had new and wider rims fitted and their wheels re-laced.
In America, the TR4 also saw a number of racing successes, primarily through the efforts of the Californian engineer Kas Kastner and his top driver, Bob Tullius, the TR4 in 1962 won the E Production national championship. The SCCA reclassified the car to D Production, and Tullius won that class title in 1963 and ’64. Soon after the TR4 was introduced Kas Kastner along with Mike Cook who was in the advertising department at Triumph in New York City convinced the company to provide three new TR4s to race in the 12 Hours of Sebring race in 1963. Beginning in Sept 1962 the cars were prepared in California where Kastner was Service Supervisor for Triumph. The cars were then flown to Florida for the endurance race in March on 1963. These cars were driven by Mike Rothschild and Peter Bolton from England, Bob Tullius, Charlie Gates, Ed Deihl, Bob Cole, Bruce Kellner and Jim Spencer and finished overall 22nd, 24th, and 35th of 65 entries, and 1st, 2nd and 4th in the 2.5 GT class. This was the beginning of the Triumph Competition Department which Kastner headed for several years subsequently and used to publicize and market the TR4. The next year a privateer TR4 finished dead last in the 1964 running of the Sebring 12-hour race and Kas Kastner returned to Sebring in 1966 with four carefully prepared TR4As, three of which finished winning the class. In 1966 at Sebring, Bob Tullius threw a piston in the most highly tuned car and did not finish. Perhaps the greatest racing victory for the TR4A was at Daytona where a Kastner prepared car driven by Charlie Gates won the 1965 SCCA D Modified Championship against Ferraris and other prepared race car exotics.
The TR4 continues to be raced in vintage sports car events and even won an SCCA class championship as late as 1991. In Australia the TR4 was a common sight at hill-climb events and various club rallies and circuit racing events. In 1964 the factory sponsored Team Triumph entered 3 TR4's in the Canadian Shell 4000 rally. These "works" cars were reportedly built with gussets on the chassis members and aluminum body panels to both strengthen and lighten the car. After import, the engines were prepared in New York by Kas Kastner where they were also fitted with lightweight magnesium wheels. Although they didn't place well in the rally, the surviving cars have become quite valuable, one of which is owned by Neil Revington, the proprietor of Revington TR in the UK. Indeed, the TR4 became a celebrated rally car in Europe and the UK during early to mid-sixties, and various replicas are still campaigned by privateers in vintage rally events through Europe.
TR4AThe Triumph TR4A was built between 1965 and 1968 by the Triumph Motor Company in the United Kingdom.
The TR4A was an evolution of the TR4, updated with a new chassis. It was hoped the new, but more complex independent rear suspension would address the buying publics' desire for more comfortable riding sports cars. This version has an "IRS" badge on the rear. It has been estimated that 75 percent of TR4A were built with IRS. In 1965 the TR4A IRS sold in the UK for approximately £968, with wire wheels being another £36, overdrive £51, heater £13 and seat belts £4each; it sold for just under $2500 in the US.
In response to dealer requests, about 25 percent of TR4As were produced with a solid rear axle option (also called a live axle), similar to the earlier TR4. The TR4A was the first vehicle to offer an option for axle type.
The new suspension eventually proved itself with the buying public and in racing, with three TR4A IRS models posting a team win and finishing 1st, 2nd and 3rd in class at the Sebring 12-hour race of 1966.
In 1968 the TR4A was replaced by the 6-cylinder TR5 (European model with fuel injection) and TR250 (US model with twin carburetors), both of which used the same body design.
In Q1 2011 there were approximately 789 licensed and 153 SORN TR4A's registered with the DVLA.
Perhaps the rarest production TR4 model is the Dové GTR4 (and GTR4A) – a TR4 rebuilt as a coupé by a specialist coachbuilder for the Dove dealership in Wimbledon, London; only 43 were produced. The conversions were by Harrington Motor Bodyworks, mostly known for construction of the Harrington Alpine, a similarly converted Sunbeam Alpine. Although most were based on the TR4 model, the sales brochure pictures a TR4A version of these cars. The engines came with such period extras as a heater in the water jackets to assist early morning starts. Some were fitted with fully balanced motors by Jack Brabham Motors or Laystall Engineering in London, which was offered as an option in the sales catalogue. Two jump seats were placed behind the driver's seat using identical materials to the originally equipped standard TR4. A wood-rimmed wheel with riveted perimeter was fitted to some models along with auxiliary lamps under the front bumper bars. A metallised identifying sticker with "Dové" on it was fitted to the glovebox lid. On the rear deck to the left below the lid, was another identifying badge with the Dové logo. The side window glasses were specially shaped with a flat top edge to fit the new roof line. Each Dové was an individual order and some variation occurred in each car. Tinted swing-down see-through acrylic sun visors were custom fitted. The aerodynamics of the Dové gave it good acceleration from 80 mph (130 km/h) to 100 mph (160 km/h) in comparison with the standard version of the car. They were originally conceived by L.F. Dove & Co. as their attempt to fill the GT category for Europe, hence the French nomenclature with an inflection at the end of the word Dové. The cars were priced at £1250, almost as much as a Jaguar E-Type, and as such were uncompetitive price-wise. One example was exported for sale through Australian Motor Industries in Melbourne, Australia. A road test of one of these cars was reported in Autocar magazine dated 7 June 1963. Up to a dozen of the cars are known to still exist
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