34 replies to this topic

[bmcecosse]

Yes - sorry H4 type and H2/HS2 are same - but some twin inlets (the ones with square flanges) can take both types. And no - a balance pipe is NOT required! Why would it be ? It's the balance pipe that that ruins the air flow - where it intersects the main flow into the head!

[camp freddy]

Not if both are HS type.

That's just plain wrong.............

@campFreddy:
You'r dead right!

HS2 (1 1/4") = vertical stud pattern
HS4 ( 1 1/2") = angular stud pattern

The H4 (1 1/2") has a vertical stud pattern.

However, a minifold like in the second link can be drilled to take HS2s

Oh and once again... Twin SUs need a balance pipe to stay in sync...

I like to show proof that I am right ,before I contradict some one.....

I have twin hs4's and a hs2 off the old engine so I knew they were different

but as said the hs2 and h4's are the same..

Edited by camp freddy, 15 January 2010 - 11:09 PM.

[camp freddy]

Yes - sorry H4 type and H2/HS2 are same - but some twin inlets (the ones with square flanges) can take both types. And no - a balance pipe is NOT required! Why would it be ? It's the balance pipe that that ruins the air flow - where it intersects the main flow into the head!

the balancer pipe probably allows for slight imbalance.

[bmcecosse]

And they work far better on twin long stubs - with NO balancer! And yes - you may have to actually take a little care to balance them properly - instead of just relying on damaging crossflow to cover up errors in the balancing!

Edited by bmcecosse, 15 January 2010 - 09:08 PM.

[adam_93rio]

now now fellas

[samsfern]

here we go again, lol

[adam_93rio]

here we go again, lol

deserves to be quoted, made me laugh

[camp freddy]

here we go again, lol

deserves to be quoted, made me laugh

ha ha , glad that's sorted.... LOl..

[Burnard]

here we go again, lol

deserves to be quoted, made me laugh

ha ha , glad that's sorted.... LOl..

Feeling Left out... Why does everything end up as an argument at the moment?

[camp freddy]

here we go again, lol

deserves to be quoted, made me laugh

ha ha , glad that's sorted.... LOl..

Feeling Left out... Why does everything end up as an argument at the moment?

I love TMF,

[Sherlock]

Burnard, I quite agree, the fact that someone has asked for advice seems to get lost in all the in-fighting, something which really does get up my nose about this forum, but we really need to get back to the original question, Adam, if you don't already have a manifold, look for a 30 degree one with the square flanges, which used to be available with 6 tapped holes on each flange, your carbs will fit a treat. We have, in the past modified an MGB manifold, by shortening the balance tube, sleeving it & aralditing it together bolting it to a head to set it correctly while the araldite hardened. I don't think I dare mention our reasons for keeping the balance tube.

Edited by Sherlock, 15 January 2010 - 11:47 PM.

[Burnard]

What does the ballence actually do?


Ive read in vizards guide that your actually better off with a bigger single carb, and twins, something to do with the flow.

[camp freddy]

What does the ballence actually do?


Ive read in vizards guide that your actually better off with a bigger single carb, and twins, something to do with the flow.

No comment !

[camp freddy]

What does the ballence actually do?


Ive read in vizards guide that your actually better off with a bigger single carb, and twins, something to do with the flow.

No comment !

Sorry can't help myself, I need to reply !!

I believe Vizard states that a single 1 3/4 carb on an MG Metro manifold (which he states is fairly good)
would be suitable for an engine up to 1380 cc..

[Sherlock]

Now I'm going to stick my neck out! If a large single carburettor is better than twins, I wonder why BMC Competitions Dept, The Cooper Car Co., Downton, Alexander, British Vita Racing, Speedwell, to name but a few, ever wasted their money on twin & even four carb set-ups & that's disregarding the number of road cars produced with them, the Cooper & 'S' spring to mind immediately, I don't think that was done just to increase insurance premiums.
As I still seem to be in possession of my head, I'll stick my neck out a bit further, variable jet carburettors such as Amal, will work without a balance tube because the piston / needle assembly is positively controlled by a cable, SU pistons are vacuum controlled & without a balance tube, you will probably never get the two pistons to synchronise accurately, although the engine will still work, best at full throttle, not so good at lower power settings. Someone will come along in a minute & tell us all how wrong I am, but my information comes from personal experience & I do believe that companies like BMC & SU spent a lot of money & time on development of such things, so I tend to go with their recommendations. I also have a book, written by one of the original Mini tuners & race drivers, Clive Trickey. As far as I'm concerned, his ideas still hold good today!