John Mitchell wrote:
> Anyone have any experience retro-fitting a lucas fuel injection unit to
> a left hand drive TR6? I know it requires a different fuel tank and a
> high pressure pump. I'm most interested in how to handle the accelerator
> linkage. Any articles or personal experience would be appreciated.
John, I don't have specific experience in retro-fitting per se, but memory
and owning a PI Triumph saloon may help?
Easy bit first, re the fuel tank. ISTR the tanks were no different except
the PI cars had an additional pipe feeding into the top of the tank for
excess fuel return - i.e. for fuel sent up front under pressure but not used
as the pump is running at a constant output pressure of about 150psi. For
the back end of the car under the boot floor, you'll need a Lucas-CAV type
fuel filter that has the same element and filter head as found on most
diesel engines of the 60's, 70's and later - Lucas part no 7111-096 as I
recall. The original type electric pump is now being discarded in favour of
a Bosch pump and when mine fails, I'll go for that myself. May not be
*original* but a damned sight more reliable.
Up front you'll certainly need:
1. A 9.5:1 cylinder head
2. A hotter cam - e.g. the injection tr6 unit, though the tr5 version was
better albeit giving a rather 'lumpy' idle. It's better to go for a UK
supplied cam because the datum track settings on the metering unit will be
calibrated to the cam. Your existing cam (if stock) would cause problems.
3. A pedestal to fit between the engine block and distributor. This has a
skew gear to drive the fuel metering unit with its six pipes and injectors.
You'll also need a Lucas 45D6 distributor with the appropriate springs to
match the cam advance curve and to complement the metering unit
calibrations.
4. The throttle bodies will come with an interconnected linkage and the
cable from your throttle pedal will fit / can be persuaded to fit into the
actuating lever.
5. A cold air box (plenum) with six interconnecting hoses and air filter box
to fit on the front end
6. I *think* you might need a new exhaust manifold - but not sure. ISTR the
cast iron units on the carb and injected TR's were different but where, how
and why I can't remember. A good 6-3-1 tubular header would be ideal and can
give up to another 10bhp if you fit the right one. IMHO the version is 1 &
6, 2 & 5, 3 & 4 because you get the maximum scavenging and something of a
howl out of the back end at about 4000 revs. Nice!
With all those bits in place, you'll certainly have a TR6 with urgency in
its step.
Hope this helps?
Jonmac
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