Triumph TR6

1968–1976 · 91,850 built · the prefix tells you the fuel system

A Karmann nose and tail on a TR5 — and four commission prefixes that answer most of the questions.

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Not listed? Plenty of parts suit several marques and never get the model name in the title — ask us and we will check the books for you.

About the Triumph TR6

Karmann restyled the front and the rear, and nothing else. The chassis and the centre body tub are TR5 and TR250, which is why so much crosses backwards and why front and rear panels do not. 91,850 were built — 13,703 injected cars and 78,147 carburettor cars, so injection accounts for under fifteen per cent of production and almost every carburettor car went to North America. The commission prefix is the most useful thing on the car: CP and CR are injected, CC and CF are carburettors, and the second letter puts you either side of the 1973 change. CP is 1968–72 injected at 150bhp, CR 1973–75 injected at 125, CC 1968–72 carburettor at 104, CF 1973–76 carburettor at 106.

The 150 to 125bhp drop is partly real and partly bookkeeping, and the real part matters when you order a camshaft. At the CP to CR change Triumph fitted the milder camshaft from the carburettor cars, revised the injection pump and dropped compression from 8.5:1 to 7.75:1 — all of which made the car far better in traffic. But some of the apparent loss is the change from SAE to DIN rating. The camshaft difference is genuine: a CP cam and a CR cam are different parts. Two other traps. Front calipers change from the TR4-type 16P to 16B and then to metric threads in 1972 — an easy and expensive mistake. And the commission plate moves from the left front wheel arch to the left door post partway through, so a customer who cannot find a number may be looking in the wrong place.

Triumph TR6 — specification & changes within the model

Built: Carburettor cars from September 1968, injected from November 1968, to July 1976. 91,850 built — 13,703 PI and 78,147 carburettor. 8,370 UK, 83,480 export.
The prefixes: CP injection, 1968–72, 150bhp @ 5500 · CR injection, 1973–75, 125bhp @ 5000 · CC carburettor, North America, 1968–72, 104bhp · CF carburettor, North America, 1973–76, 106bhp. First letter pair = fuel system and era.
The power drop: At the CP to CR change: the milder camshaft from the carburettor cars, a revised injection pump, and compression 8.5:1 down to 7.75:1. Part of the apparent loss is the SAE to DIN rating change. The camshaft difference is real — CP and CR cams are different parts.
The Karmann restyle: Front and rear only. Chassis and centre body tub are TR5 and TR250, so mechanical and centre-body parts cross backwards; nose and tail panels do not.
Brakes: Front discs, rear drums, as the TR5. Calipers change twice: TR4-type 16P, then 16B, then metric thread from 1972. Check the thread before ordering.
Anti-roll bars: Front bar standard. A rear bar is an upgrade, not a factory fitment you can assume — sources disagree on whether it was ever a factory option and none gives a date.
Overdrive: Laycock A-type, 22 per cent, on second, third and fourth. Then J-type, 28 per cent, on third and fourth ONLY — the gear availability changes, not just the unit. Usually dated 1973, though one source says 1971. Identify the unit. Overdrive became standard in 1974.
Commission plate: Left front wheel arch on early cars, left door post on later ones. If a customer cannot find a number, they may be looking in the wrong place.
Other dated changes: Ignition switch moves from dash to steering column, 1970 · twin downpipe exhaust on carburettor cars, 1972 · front spoiler added and wire wheels deleted, 1973 · air injection, 1975.
Electrics: Negative earth.