H2 twin carbs

[Minigman]

I’m looking to put together a pair of H2 carbs for my 1960 mini.

Is there a specific type I should be getting?

Float bowl angles are fixed so do they differ from one model to another?

Any info would be appreciated.

Thanks.

[steve1071]

Think I have a pair. Will dig them out

[mk1]

Some H2's have fixed float chamber angles, but these are not common. The angle is usually determined by a small insert that goes between the bowl & the body. You can get different angles depending on the application.

A Mini should have 30° bowls.

[Minigman]

Some H2's have fixed float chamber angles, but these are not common. The angle is usually determined by a small insert that goes between the bowl & the body. You can get different angles depending on the application.

A Mini should have 30° bowls.

Hi Mark.

I think you’re referring to HS2 not H2?

I’m after some lovely looking earlier H2s ideally.

[ricardo]

I think Mark is referring to HS2, yes.

H2 are pretty much the same as any other H type in terms of design.

They were not common on minis and usually are found with T2 type chambers, 20º or 0º.
You can fit the usual Mini 30º chambers (4815 and 4814)... or run them with the 20º.

I see there are people posting online saying H2 would look better than HS2 twin carbs on modifyed minis, etc, but fitting them is not as straight forward as you might think.

There are at least 2 types of H2 bodies which are very different. And between similar types, I've seen slightly differences in length (production differences - errors?).

Here's a picture of some carb bodies. From left to right:
- H2 (short type)
- H2 (long type)
- H2 (long type - longer)
- H4



Mind you that if the longer type is fitted together with a longer manifold (longer than the standard type), the choke levers will hit the firewall and possibly there will be no room for air filters (depends on the manifold / car).

In order to fit a set of H2 carb bodies to a mini you must mill a slot on the manifold flange as the original mounting holes will not align with Mini manifolds. Then internal passage aligment may become an issue, or not. If it is a problem, they can be dowelled.

I can help with these modifications as I have done a few in the past.

Also, since between sets they vary so much in length I have a jig to measure the distance from the jet to each flange. Then I skim each flange in order to make them equal (and straight).

As for bushing, this is the same as the other H types. The bushes are cast with the bodies and you can see a thin alloy wall at each side of the bush (if they were not rebushed yet). In order to renew them I have a piloted reamer (and end mill) that I run to remove the old bush keeping the internal alloy wall intact (I don't drill through). Then the new bush is press fitted and reamed in line with the other.

[nick rogers]

Ricardo, your pictures are not visible. I would be interested in seeing them.

[ricardo]

Hi Nick. Can you see them now?

[Minigman]

Great info there, thanks Ricardo.

The images can now be seen fine.

So not quite as straightforward as I’d assumed or hoped!

Would you know the part number for the shortest H2 body or know which model car it would have come off please?

Thanks again.

[mk1]

Doh!

Read twice & answer once!

Ricardo has given a very comprehensive answer.

I run H2's on my Downton 850.

[ricardo]

The shorter type is AUC6060. I just checked and these do line up with mini manifolds, so the modifications only need to be done on the longer bodies.

A quick search on Google says this shorter bodies were found on early MGs and/or Rileys (?).