Twin Stromberg VS SU carburetters

Crabolsky140

I am planning of converting the single Stromberg on my 140 to twin carbs. I would seem that the Strombergs are a consistent and reliable offering, while the SU can potentially offer more performance. The caveat with the SU's being they can take some finessing to get them running right.

I would love to hear some thoughts from people that have run both and whether there is a clear winner between the two?

egads (she/her)

SU only wins on parts availability and expertise that is still around. The Stromberg runs better and if it is only diaphragms that need doing they win, but if you need to tune them up for more power or re-jet you can end up having to do the jets yourself.

Crabolsky140

egads;22383 wroteSU only wins on parts availability and expertise that is still around. The Stromberg runs better and if it is only diaphragms that need doing they win, but if you need to tune them up for more power or re-jet you can end up having to do the jets yourself.

So the Stromberg requires less maintenance and if need be the average punter can install jets when needed? Sounds like they will be more trouble free. Did you find you needed to tweak and maintain the SU's on a more regular basis?

My dad had SU's on his MG and he said they required some real knowledge to get them running right when he rebuilt his. He actually had a friend assist in tuning them afterwards and it took a good number of hours.

perko

i know a few guys running twin su's on minis and synching them seems to be a bit of a dark art, that said once they're set up you can pretty much leave them alone from all reports

rebuilding su's is easy, i think egads is getting at the fact that there are heaps of different set up options available for su's whereas i think once you stray too far from stock the strombergs are hard to get parts for

egads (she/her)

Spot on. Setting up either will take some work. British stuff using su's has made for a viable market to keep parts being made.

Spac

Years ago, SUs made slightly more power, but they didn't hold their tune as well.
Since the death of leaded petrol, Stromberg rubber diaphragms have become a short-lived item, and most of the knowledge base has dried up.
For those reasons alone, I consider the SUs to be the better choice. I would not race out to swap some happy Strombergs with SUs, bu I would certainly not pursue Strombergs for a single to twin carb conversion.

Neither is inherently more difficult to tune. Once properly setup, balancing either type of carby to an acceptable standard is well within the skills of most backyard mechanics.

Rob

webers

egads (she/her)

Viton floats for su's makes tune holding happen more readily as the floats will no longer slowly fill.

Crabolsky140

Awesome @Spac thanks for that info... very helpful!

@Rob Webbers extra exy. Well comparatively when compared to the SU's.

@egads Viton floats might be the go once I am up and running.

Rob

Crabolsky140;22402 wrote @Rob Webbers extra exy. Well comparatively when compared to the SU's.

You are correct. I do have a pair of DCOE solex carbs you can have pretty cheap, they will bolt up to a weber manifold (dont have one of those) will need to be kitted but.

this is not them but they are exactly the same.

Crabolsky140

Rob, I don't know much about the Solex other than it being part of the Volvo sport upgrades. What did you pull them from?

Rob

They came off a Toyota 18RGU engine. They are still attached to a Toyota manifold in fact

Rob

also this....
http://ozvolvo.org/discussion/1153/brand-new-twin-cd-175

Vee_Que

I'm tempted for a 16v motor in my 122 on carbs of some sort...