w115 weber conversion

[w115AMG]

Does anyone know where I can get a weber conversion for the dreaded Stromberg carb?

I know Jameng.com do a kit in the states.

Thanks

 

[davidsl500]

these are one of the biggest weber stockists in the UK

www.southerncarbs.co.uk

 

[w115AMG]

webers

Cool.
Thanks. No luck there I'm afraid.

 

[paulcallender]

Why is the Stromberg dreaded? Since almost all cars are now FI, surely Weber are going to be aging in a similar way to Stromberg. And if you have desires of tuning for higher output, I could suggest a W114. Or perhaps, a different car - I have a 280CE and they're not really the boy racer type of vehicle.

 

[tom7035]

I must admit I was quite a fan of Strombergs in my younger days, properly tuned.

 

[turnipsock]

My old Triumph Herald had a Stromberg carb, I thought it was a pretty good design. However, there was a Weber conversion for this as well.

I think that Lotus had some old cars with Strombergs but also went onto Webers.

Presumably you only need to get a manifold and you can bolt on a Weber or Dellorto.

You then need to work out what jets you need after that, I would err on the lean side with the way that petrol prices are going.

 

[paulcallender]

You then need to work out what jets you need after that, I would err on the lean side with the way that petrol prices are going.

Can you explain how a lean mixture uses less fuel?

 

[turnipsock]

Probably not, but here goes...

lean mixture has less petrol/more air therefore you don't use as much petrol. You don't produce as much power though and excessive leaning can cause damage to valves and pistons.

 

[tom7035]

Producing less power of course means more accelerator, less vacuum = more fuel?

 

[paulcallender]

Probably not, but here goes...

lean mixture has less petrol/more air therefore you don't use as much petrol. You don't produce as much power though and excessive leaning can cause damage to valves and pistons.

Okay, less petrol more air: the work comes from the chemical energy in the fuel, burning in the oxygen (air contains this). Same amount of fuel = same amount of energy. But, because you're running at higher than stoichiometric ratio, while one cylinder is burning this fuel, another cylinder is compressing a greater amount of air, than if it were running at the right air/fuel mix. So, the engine is less efficient overall (less of the fuel energy is converted to useful work).

Thus, 'leaning out' an engine makes it less efficient and for the same amount of power, uses more fuel. Of course, the fact that you're needlessly compressing excess air means that the engine gets hotter, which could potentially damage things (in the long term).

This is the argument for FI over carburettor(s).

 

[turnipsock]

I knew I was opening a can of worms on this one.

CART and F1 cars seem to be able to adjust things so they can go longer on a tank of fuel, just not as fast. How does that work?