12 replies to this topic

[Fluffy]

Just found these via a second hand site. ( see picture )
2 HS6's in a set up for a rover 2300 engine.
Seller agreed to 25 €. Hard to resist for this price.

Would this suit my 1098 ? It's standard, but I would obviously have to fit another manifold
and as result the exhaust as well. This should imrove flow over my HS4, shouldn't it ?
I figured 2300/2 = 1150 so the setup for one should be about right ?

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[secondopsman]

Does seem cheap ,But if your engine is a standard 1098 then its a bit of an over kill really.
Pete

[dklawson]

I suspect that twin HS6 carbs will be way too much for a street driven 1098. However, you got a great deal. They are worth more than what you paid just as rebuildable cores. I would clean them up so they are nice looking from every angle and post them for sale on eBay or web sites for performance Volvos, Austin-Healey's, or 6-cylinder Triumphs. You could use the money you earn to buy a nice set of HS2s or even HS4s.

[Cooperman]

One HS6 would be good for your car, but 2 would be an 'overkill'.
Twin HS6's are fine on a race engine pulling over 6500 rpm with a very hot can, at least a 286 and you need a well gas-flowed inlet manifold, ideally an after-market one without the horrible balance tube which the standard BMC inlet manifold has.

[bmcecosse]

Exactly! They work very well indeed on a weber-like manifold with no balance pipe on a 'full race' engine. But twins will be far too big for your 1098 engine. My TR7 uses these carbs - and they are often very cheap on ebay - nobody wants them!

[Sherlock]

You certainly had a bargain, these are superb on a 1400, but preferably without the capstat jets, which are easily disabled. A bit big for your engine, but you should make a profit on them.

[Fluffy]

I just got them.

I don't have plans to put one of them on immediately, but I do want to see waht my options are.

I bet the original manifold won't be able to handle this ? By the way, what is the size of the in -and outlet ports on the original cast manifold anyway ?
When my wife lets me, I intend to purchase a freeflow, combined with an RC40 ( preferably center exit, I love that ) and an alloy manifold for the SU6. Would this perform well on my further unmodified 1098 ?

[dklawson]

I don't have plans to put one of them on immediately, but I do want to see waht my options are.

I'm glad they have arrived.

I take it from your last post that you have chosen not to listen to all those who suggested that these carbs will flow too much air for a 1098. I think you'll find a few people at MiniFinity who have installed HS6 carbs in pairs but if I remember correctly, those were on 1275s and larger. You may find more information on this carb swap through them.

[Fluffy]

>

As I have indicated earlier, both in the original post and the last one, I only intend to use one of these, not the set of two,
and I now would like to find out what modifications are needed to make this work.


The comment people have given me was very useful, and I certainly understand two of these carbs are serious overkill.

[Cooperman]

A few years ago I had twin HS6's on a 1330 Cooper 'S' with a 544 am, a Longman head, etc and it was great.
It did go best at over 5500 rpm and the am was 'old technology', but this was back in about 1989-1990.

[dklawson]

Sorry Fluffy.

Yes, re-reading your posts I do see that you were indicating using only 1 of 2 carbs, however, you did make it necessary to read carefully to see your intent.
" I figured 2300/2 = 1150 "
and
" I don't have plans to put one of them on immediately "

You asked about fitting this to a manifold. You may or may not find an HS6 compatible intake manifold. If you don't find exactly what you need, consider buying an extra manifold for a single HS4 manifold. Remove the carb studs for the HS4 and plug them, preferably with short pieces of threaded aluminum rod. Enlarge the opening of the HS4 manifold until it is the same diameter as that of the HS6. Make a ring or plug (cardboard, wood, etc) that will allow you to center the HS6 over the enlarged opening of the HS4 manifold. Clamp the two together while centered by the plug and transfer the HS6 mounting hole locations to the HS4 manifold. Then remove the carb and drill and tap the manifold for the studs. You obviously will need 4 studs if you plan on using all the bolt holes.

Other intake manifold modifications are typically listed in texts like those by Vizard. He will walk you through how to match the intake manifold ports to the cylinder head and gasket and how to re-shape the internals of the manifold (where possible) to achieve better flow.

You also may need to contact Burlen to see if they have some drive linkages for the HS6 that will allow one of them to operate as a single carb on your Mini. When you talk to Burlen, ask about the float bowl spacer/washer to the carb body. These are made in different angles so the float bowl will remain level when the carb is installed on the intake manifold. You may have to measure the angle of the intake manifold and tell this to Burlen to get the correct bowl spacer.

Congrats and do let us know what you end up doing and how the carb works for you.

[Fluffy]

Doug,

for for my somewhat strong reply earlier. I guess what I try to write in English doesn't always come over as I intended it.

Thank you very much for the explanation. Sounds like I have my work laid out for me for the coming cold months.
That is, as soon as I have finished retiling the bathroom and rebuilding the brakes on Carrot.

[Sleepy Stu]

The other option is to save yourself a lot of work, move them on for a profit and get yourself a HIF44 which will be ideal for your engine!