Thanks so much John. I have heard that the late model US tank is the
same as the PI unit. I will investigate the extra return tube. I can
get most of the the parts from a late model saloon 2.5PI which seems to
be pretty similar to the TR6 unit. I have a Lucas pump, but not certain
how long that will last. I have an S2 cam and a 9.5 to 1 compression
ratio on a fresh engine. The car is running so well on the Strombergs
right now, that I shouldn't mess around with it, but winter is coming
and I need a project:) John Mitchell 76 TR6
John Macartney wrote:
> 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
|