Bought myself a TR6

Bought myself a TR6

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TR4man

4,268 posts

141 months

Monday 15th June 2020
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Mine was the full fat version too!


RATATTAK

7,027 posts

156 months

Monday 15th June 2020
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And mine 'cept the power was downgraded in (I think) 1973 ...


hilly10

5,877 posts

195 months

Tuesday 16th June 2020
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I love nice clean engine bays, good stuff guys

Adenauer

Original Poster:

18,062 posts

203 months

Tuesday 16th June 2020
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I was advised to stay away from the injection ones as they like to go wrong, is that not the case then?

Oh and because carbs are for real men, obviously. biggrin

Adenauer

Original Poster:

18,062 posts

203 months

Tuesday 16th June 2020
quotequote all
I'll have a question for you guys tomorrow if I can remember to take a picture of the engine bay later today.

There's a pulley thing that looks like it should have a belt on it, but it hasn't. The car runs fine and everything's great but I have no idea why there appears to be a belt missing.

I'll post a few pictures tomorrow.

tapkaJohnD

1,610 posts

171 months

Tuesday 16th June 2020
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Adenauer said:
I was advised to stay away from the injection ones as they like to go wrong, is that not the case then?

Oh and because carbs are for real men, obviously. biggrin
Wrong on both counts, Count Adenauer!
The Lucas Pi was developed for the Le Mans winning Jaguars in the 50s, on wartime aviation exprience. It was and still is, highly reliable, and will stay in tune when the hairychested carb boys are fiddling with their chokes all day.

Yes, Triumph made some wrong, cost-cutting decisions, like the fuel pump, powered by a wiper motor which with age has proved unreliable and the lack of any effective swirl pot, but those can be corrected. Worse was the decision not to spend on training dealer staff in what was the first production car with fuel injection. That was the source of the reputation for unreliability, as mechanics fiddled with it.

And the Metering Unit had to be made with high-precision, unlike much to the motor industry at the time and so was costly. When Bosch came out with the cheap JetTronic, primitive fuel injection by comparison, Lucas couldn't sell the system to any other manufacturer. So it was never used again for mass production, but Maserati did, and so did Ford in competition Capris and BMC in racing Minis.

John

silentbrown

6,703 posts

83 months

Tuesday 16th June 2020
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Running twin SU's?

I can't recall the power figures for US spec cars but I think the smog laws restricted them pretty heavily. Around 110BHP?

PI cars were, I think, either 130 or 150BHP allegedly - depending on cams/year. Although I think those figures tended to be optimistic..

Magnum 475

2,408 posts

99 months

Tuesday 16th June 2020
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The numbers in my mind for UK cars, and it's been a few years since I was in the Triumph scene, were 125 bhp on Carbs and 150 bhp on PI.

Of course, the ultimate answer is to convert the TR6 to E46 M3 running gear wink


Adenauer

Original Poster:

18,062 posts

203 months

Tuesday 16th June 2020
quotequote all
tapkaJohnD said:
Adenauer said:
I was advised to stay away from the injection ones as they like to go wrong, is that not the case then?

Oh and because carbs are for real men, obviously. biggrin
Wrong on both counts, Count Adenauer!
The Lucas Pi was developed for the Le Mans winning Jaguars in the 50s, on wartime aviation exprience. It was and still is, highly reliable, and will stay in tune when the hairychested carb boys are fiddling with their chokes all day.

Yes, Triumph made some wrong, cost-cutting decisions, like the fuel pump, powered by a wiper motor which with age has proved unreliable and the lack of any effective swirl pot, but those can be corrected. Worse was the decision not to spend on training dealer staff in what was the first production car with fuel injection. That was the source of the reputation for unreliability, as mechanics fiddled with it.

And the Metering Unit had to be made with high-precision, unlike much to the motor industry at the time and so was costly. When Bosch came out with the cheap JetTronic, primitive fuel injection by comparison, Lucas couldn't sell the system to any other manufacturer. So it was never used again for mass production, but Maserati did, and so did Ford in competition Capris and BMC in racing Minis.

John
You learn something new everyday biggrin
Oh and no need for the Count.....

Maybe it's a German thing, but people don't have a good thing to say about the injection systems over here, or at least the 3 or 4 people I spoke to about it didn't. Never mind though, I have my carbs and am happy with them.

Although, if mine has 110bhp it certainly hides them well. laugh

RATATTAK

7,027 posts

156 months

Tuesday 16th June 2020
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Here are some figures courtesy of the TR Register:

TR6 Petrol Injection (Lucas Indirect Fuel Injection) for UK markets

CP Series 150 bhp @ 5500rpm

CR Series 125bhp @ 5000rpm

Twin Stromberg 175CD Carburettors for US and other export markets.

CC Series 104bhp @ 4500rpm

CF series 106bhp @ 4900rpm

Performance Data
TR6 PI (CP) (AUTOCAR) TR6 PI (CR) (TRIUMPH) TR6 CARB (CC) (ROAD) TR6 CARB (CF)
0 - 30 mph 3.0 s 3.5 s 4.0 s 3.5 s
0 - 50 mph 6.3 s 7.0 s 7.6 s 8.5 s
0 - 60 mph 8.2 s 9.5 s 10.7 s 11.5 s
0 - 90 mph 20.2 s 22.5 s no data 26.0 s
0 - 100 mph 29.0 s no data 39.0 s no data
Standing ¼ mile 16.3 s 17.0 s 18.5 s 18.1 s
Fuel Consumption 19.8 mpg 22 mpg 24.6 mpg 29 mpg
Mean Max. Speed 119 mph 116 mph 111 mph 111 mph

Sorry about the formatting ... can't get it to work (though I did try) wobble

Edited by RATATTAK on Tuesday 16th June 13:46

baconsarney

10,839 posts

128 months

Tuesday 16th June 2020
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Adenauer said:
You learn something new everyday biggrin
Oh and no need for the Count.....

Maybe it's a German thing, but people don't have a good thing to say about the injection systems over here, or at least the 3 or 4 people I spoke to about it didn't. Never mind though, I have my carbs and am happy with them.

Although, if mine has 110bhp it certainly hides them well. laugh
My Dad had a TR5 around 1970, absolutely loved it, but I do clearly remember the fuel injection routinely failing in one way or another... I had a Lotus 7 at the time with two twin choke Webers hanging off one side of the head, never failed...

By the way Adenauer that’s a cracking looking example smile

Edited by baconsarney on Tuesday 16th June 13:55

TR4man

4,268 posts

141 months

Tuesday 16th June 2020
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I had mine from 1982 until 1991 and it did suffer from an overheating Lucas fuel pump in the early days. So much so, that I used to dread hot weather and/or heavy traffic when the pump would emit a high pitched tone which warned me that I had at best a couple of minutes before it overheated.

I fitted a cooling coil which helped a little and I even used to carry a bag of frozen peas in a cool bag to wrap around the pump to cool it down. If the worst came to the worst, I just waited half and hour or so and it cooled enough to then restart.

Around 1985, on the advice of other owners, I had a Bosch pump fitted. Although even that was fitted in the near side rear wheel arch to aid cool air flow.

Despite all that, I loved my TR6. Bought at a time when my friends had Metros, Chevettes and Mk1 Fiestas, I had no end of requests for a ride in it.


rev-erend

21,062 posts

251 months

Tuesday 16th June 2020
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I also had a TR6 before I got into TVR's.

It also have the fuel pump issue but I solved it by getting a 12v dc PC fan to blow cool air on the pump.

Never had the issue again.

Adenauer

Original Poster:

18,062 posts

203 months

Tuesday 16th June 2020
quotequote all
RATATTAK said:
CC Series 104bhp @ 4500rpm
That's what mine is supposed to be, and what it feels like, makes much more sense than some of the 140-150bhp figures.

Anyway, it's not about driving fast, it's about the noise, the cramped interior, and the smell when you open the garage. cloud9

Oh and anything above about 120kph and I start to feel a smidgen 'vulnerable' driving it. biggrin

hilly10

5,877 posts

195 months

Tuesday 16th June 2020
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With the fuel pump upgrade and a few other modifications the PI system is now reliable (as I touch wood)

John is quite right regards the dealership mechanics at the time,they did not have a clue, but Triumph then published a 11 page fault finding paper to all dealerships,apparently it did wonders. I do have one in my possession and it really is easy to work through.

silentbrown

6,703 posts

83 months

Tuesday 16th June 2020
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Adenauer said:
That's what mine is supposed to be, and what it feels like, makes much more sense than some of the 140-150bhp figures.

Anyway, it's not about driving fast, it's about the noise, the cramped interior, and the smell when you open the garage. cloud9
There's plenty of scope for improved performance even with Strombergs. Cam, head, and a well-designed 6-3-1 manifold should make a world of difference.

baconsarney

10,839 posts

128 months

Tuesday 16th June 2020
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silentbrown said:
Adenauer said:
That's what mine is supposed to be, and what it feels like, makes much more sense than some of the 140-150bhp figures.

Anyway, it's not about driving fast, it's about the noise, the cramped interior, and the smell when you open the garage. cloud9
There's plenty of scope for improved performance even with Strombergs. Cam, head, and a well-designed 6-3-1 manifold should make a world of difference.
Supercharger? If you’re going to modify I’d guess supercharging would give biggest bang for buck and more easily reversible... modifying is a disease biggrin

silentbrown

6,703 posts

83 months

Tuesday 16th June 2020
quotequote all
baconsarney said:
Supercharger? If you’re going to modify I’d guess supercharging would give biggest bang for buck and more easily reversible... modifying is a disease biggrin
Maybe that's what the OP's missing drivebelt is for!

https://classicmotorsports.com/articles/six-shoote...

tonyvid

9,468 posts

210 months

Tuesday 16th June 2020
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Stop it! These are lovely and I'm trying to resist something I simply don't have the space for cool

RATATTAK

7,027 posts

156 months

Tuesday 16th June 2020
quotequote all
Adenauer said:
RATATTAK said:
CC Series 104bhp @ 4500rpm
That's what mine is supposed to be, and what it feels like, makes much more sense than some of the 140-150bhp figures.

Anyway, it's not about driving fast, it's about the noise, the cramped interior, and the smell when you open the garage. cloud9

Oh and anything above about 120kph and I start to feel a smidgen 'vulnerable' driving it. biggrin
I agree entirely. Mine's a CR Series (125 bhp) and a great cruiser. I have a 600+ bhp 911 if I want to go fast wink