Carbs on a Stag

[Dieter H. Marschall]

Hello everybody,

as most of the TR6s went to the USA they were equipped with two Stromberg 175 carbs. Du to the fact that SU HS6 carbs are much easier to adjust and bring more power most of those TR6s were thus altered and equipped with SU carbs - or sometimes Webers.

How come that I have never come across a Stag with SU HS6 carbs? What you encounter are sometimes Holleys, but not SUs.

Does that have to do with the fuel bowel arrangement on SUs?

Kind regards,

Dieter from Germany.

[V8 Rumbler]

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Mainly the height---thay will not fit under the bonnet

Darren

[V Mad]

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I suspect it was to do with costs. The SU has a costly precision air valve instead of the diaphragm in the Stromberg.

[les M]

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Dieter H. Marschall wrote:

Hello everybody,

as most of the TR6s went to the USA they were equipped with two Stromberg 175 carbs. Du to the fact that SU HS6 carbs are much easier to adjust and bring more power most of those TR6s were thus altered and equipped with SU carbs - or sometimes Webers.

How come that I have never come across a Stag with SU HS6 carbs? What you encounter are sometimes Holleys, but not SUs.

Does that have to do with the fuel bowel arrangement on SUs?

Kind regards,

Dieter from Germany.

Dieter

S U's can be fitted to the stag engine, but they need a bit of machining first to the dash pots and an extra sandwich plate (10mm thick) fitted to the manifold. Once the needles are sorted then its fit and just about forget, far better than the stromberg carbs.( but not quite as good as fuel injection)

Les.

[Kevin Garrod]

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Ah Les, you always make everything sound so simple!

[Dieter H. Marschall]

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Hello Les,

Thank you for your input. So you obviously shortened the top of the dashpots. What did you do to the fuel bowls to get them level? Did you use SU HS6 or HIF6 carbs?

Personally I a convinced that SU carbs are much easier to handle and provide more power on top - as proved with TR6s.

Kind regards,

Dieter.

[les M]

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Dieter ( and Kevin)

As far as I am aware the HIF6 and the HIF44 have the same size body, I used 2 HIF44's. ( this is the bit that Kevin likes) The dash pots and corresponding pistons and dampers have to be shortened, this isjusta machining jobs and no extra parts are required. The SU's fitted on my car have been shortened to the maximum so that they clear the bonnet with the standardsound deadening pad fitted.

The SU's use the same 4 bolt flange fitting as the strombergs so no problem in fitting them into the manifold mounting. I found that the the bottom of the float/body was just touching the cam covers on mine so I made up a 10mm thick sandwich plate to lift the carbs clear,I also had to make up a longer centre stud bolt. Once fittedadapter plates were made to connect onto the existing stag air filter elbows. I fitted standard Rover 3.5 needles and have found them OK



Les.

[Kevin Garrod]

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Or you could just stick a Weber on it!

[Andrew S]

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These carbs came with my Stag and I am not which SU's they are. They have a tab on them saying AUD 521L andAUD 521R.

There is a mounting plate as you can see and the linkages are all there as if it just fits as normalstrombergs. There was an invoice for fitting the Strombergs and these carswere in the boot so presume that these were on it and running.

Anyone know which ones they are and where they would have come from going by the shape and air intakes?

Andrew

[m9fdb]

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Andrew S wrote:

These carbs came with my Stag and I am not which SU's they are. They have a tab on them saying AUD 521L andAUD 521R.

There is a mounting plate as you can see and the linkages are all there as if it just fits as normalstrombergs. There was an invoice for fitting the Strombergs and these carswere in the boot so presume that these were on it and running.

Anyone know which ones they are and where they would have come from going by the shape and air intakes?

Andrew

I would have a odds on bet they are off of a Rover P6 or P5 defo one of those

[Andrew S]

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Thanks Darren

Out of curiosity, the tabs that have AUD, is there anAustralia connection?

Andrew

[les M]

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Kevin Garrod wrote:

Or you could just stick a Weber on it!

Kevin

It makes no difference what carb is fitted to the stag, some are better than others admittedly (weber arequite good)but only marginally better. It's the manifold that's the main problemit stops the engine breathing properly, well that's whatI think anyway. So I will just carry on in my own little way playing with different (simple) things here and there.

Les.

[Kevin Garrod]

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les M wrote:

Kevin Garrod wrote:

Or you could just stick a Weber on it!

Kevin

It makes no difference what carb is fitted to the stag, some are better than others admittedly (weber arequite good)but only marginally better. It's the manifold that's the main problemit stops the engine breathing properly, well that's whatI think anyway. So I will just carry on in my own little way playing with different (simple) things here and there.

Les.

I think it's great that we are doing different things with our Stags,EFI, Strombergs,SUs,Holleys and Webers (any others?) wouldn't it be boring if they were all the same?

I've got plans for my inlet manifold....

[V Mad]

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les M wrote:

Dieter H. Marschall wrote:

Hello everybody,

as most of the TR6s went to the USA they were equipped with two Stromberg 175 carbs. Du to the fact that SU HS6 carbs are much easier to adjust and bring more power most of those TR6s were thus altered and equipped with SU carbs - or sometimes Webers.

How come that I have never come across a Stag with SU HS6 carbs? What you encounter are sometimes Holleys, but not SUs.

Does that have to do with the fuel bowel arrangement on SUs?

Kind regards,

Dieter from Germany.

Dieter

S U's can be fitted to the stag engine, but they need a bit of machining first to the dash pots and an extra sandwich plate (10mm thick) fitted to the manifold. Once the needles are sorted then its fit and just about forget, far better than the stromberg carbs.( but not quite as good as fuel injection)

Les.

Les, is this your engine? How do you adjust the mixture, aren't the SU adjusters at the bottom where you cant reach?

[Stagdad]

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Kevin Garrod wrote:

I've got plans for my inlet manifold....

Do tell, Kev