TR4/4A Strombergs

[karls59tr]

Did the TR4A Strombergs have the adjustment at the bottom of the float bowl?

 

[Geo Hahn]

I believe the TR4 & 4As with Strombergs used the same carb - in which case the answer is 'yes'.

 

[karls59tr]

In what way are the TR6 Strombergs different....do they not have the adjustment on the bottom of the float bowl?

 

[Geo Hahn]

Speaking of Strombergs generally - I seem to recall that some later ones had mixture adjustment made with a tool through the top. Still later came 'emissions' models that were designed never to be adjusted (though naturally there are still ways to change the mixture on those too).

 

[Geo Hahn]

In what way are the TR6 Strombergs different...

The Moss catalog drawings may give you some idea of the differences:

TR4/4A Carbs

TR250/6 Carbs

In addition to the change in how mixture is adjusted, the 'choke' mechanisms are very different. TR4 uses a 'starter bar' which lifts the piston slightly to enrichen the mixture. The TR6 uses a 'starter box' which I think uses a rotating disk with ever-increasing small holes that are exposed to allow additional fuel for cold starts.

 

[dklawson]

The Strombergs that adjust from the bottom are "CD" carbs and the later ones that adjust from above are CD2s. The CDs adjust very much like an SU with an bottom mounted movable jet. On CD2s the jet is fixed and require a special, long Allen wrench to reach down into the bottom of the dashpot to adjust the mixture needle.

 

[trrdster2000]

I've had very good luck with the CD ones on the 4/4A's and found them to be just that little quicker in reaction than the SU.

Not all will agree with that, but I was working on TR's when they came in England and they were not well received there either.

Wayne