AC Owners Club Forum > Ace, Aceca & Greyhound Forum

SU H2 hydraulic dampers

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AEX 31:
Hi Nick and Barrie,

Please find some pictures of my carburettors enclosed. Externally they do look identical to any other H2 carburettor that has dampers. Interestingly enough I just spoke to a friend that has an early Aceca, I.e. from the spring of 1955, and that car doesn’t have any dampers either.

I realise  is that I might be totally wrong since I assumed that later cars have dampers. This is an assumption based on the fact that I have bought a number of carburettors that were supposed to be from later Ace’s, and they all have dampers…

To try to answer your question Barrie, I did read on an MG forum that MG changed to H2 carburettors on the TC’s, with dampers in August 1947. The reason was that during hard acceleration the (xpag) engines sucked too much air resulting in a too weak mixture. I’m obviously no expert and I have no other evidence for this.

Obviously the Weller engine is also a different beast compared to the MG TC engine.

I also believe the question has to be changed a bit, did any later AC’s with the Weller engine have SU carbs with dampers?’

Jonas

Note, the top image shows the solid piston.

B.P.Bird:
Jonas,
Would there be a special reason why you want the hydraulic damper ?
Barrie

AEX 31:
Barrie,

No, I was merely wondering if 31 had the correct type of carburettors, or rather suction chamber pistons!

Part of the reason is that the first time I saw 31 was in 1981, after it had been “restored” by the then owner, that also at the time, owned roughly 30 prewar MG’s! I have been pondering over the possibility that he might have made a change…

Since the dampers were introduced even before the war. But since two early UMB engine owners have come forward, I’m sure that it’s correct.

The question if later Ace’s and Aceca’s came equipped with H2 carburettors with hydraulic dampers still remains, surely there have to be someone on this forum that knows about that.

Thank you.

Jonas

kicksey:
Hi Jonas

I am also following this thread with interest as I have carb issues and I am thinking about getting them refurbed by Burlen,  my setup looks very similar to yours although not as polished on my 1955 Aceca AE513

Regards

Chris

AEX 31:
Chris,

Thanks for your input. I actually had the carburettors for 31 restored at Burlen something like 6-7 years ago. As far as I can understand they did a good job and they work okay.

I do occasionally have some running on issues that could potentially come from a butterfly or butterflies not closing as much as they should.

I did notice, for instance, that Burlen didn’t match the right dashpots with the correct pistons when reassembling… They are all marked 1, 2 and 3…

However I’m slowly planing to make a spare engine and this time I will try to restore the carburettors myself. Burlen haven’t got any “solid” pistons so when restoring one has to keep the original ones, if that is important to the restorer!

But still nobody on this forum that knows if later, AC engines cars came equipped with SU’s with hydraulic dampers or not?

Please, if anybody knows about this, do post.

Thanks

Jonas

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