Porting Single Carb Manifold
 

Anyone done any good flow mods on the single carb cast iron manifold?

I don't think you would get any benefit as the manifold has very generously sized branches anyway ...

Thanks. Goals have mainly been trying to increase low to mid torque so assume that's more input velocity so improving any corners, casting defects etc but not really sure if there is much or anything to gain.

In the wheezy world of series 2 Land Rovers small improvements like that were often done before the fad of replacing with more modern engines became the norm...

...in a situation where you enjoy playing I say "why not"?

[You'd probably see better benfits in economy from buying energy saving tyres however - I'm guess you're not being a speed demon when asking such questions]

Yeah don't think there would be much max HP gain to be had with the Stromberg but interested in seeing what improvements are there, mainly low to mid range torque. That's the area that the single carb matches up well or maybe even beats the twin SU setup in stock form; B20B. Plenty of mods have been done with SUs but seen nothing for Strombergs that I've seen. I have a spare manifold so will pull it out for a look.

I normally just cruise around but do enjoy giving it a bit of a squirt every now and then. Surprised a few cars when out testing the last couple of weekends. 😁

Power to weight can indeed surprise some.

If you do have a play I for one will be interested to hear how you get on.

The B20 in my PV has a Weber carb and a matching manifold that was apparently a good period upgrade. I've just got a larger bore exhaust to match. I've got a feeling this will just change the sound though - it is meant to copy the Abarth design - we'll see,,,

Will do.

I have the two inch exhaust fitted, think it made a little difference.

This article is not for Volvo, and it is not for an intake, but it might give you some ideas.

http://www.diyporting.com/thread.html

But if you increase the inlet port sizes you SLOW the air flow , small is better for torque ... a little turbocharger would achieve what you are looking for :-)

Not necessarily; if the casting has sharp turns, sharp edges, casting defects and things like that I would imagine they slow the flow of air so removing those would increase the velocity or maybe better put there will be fewer obstacles to slow it down. Of course volume is removed in these localised areas but at this stage I'm not thinking of increasing the port sizes unless they are undersized at the moment.

The same design of stub stack I added to the carb intake was flow tested by David Vizard and it increased flow by 5.8%. It did this by having a large radius and eliminating the sharp edge. So that's the sort of thing maybe could be done inside the intake, giving the air an easier path.

I'm looking at a supercharger for another project but this one is staying original, or looking original.