18 replies to this topic

[Tomf]

Well i have been offered a pair of 1.5" twin MGB su carbs prety cheap.

They would come with a manifold and linkage, but this is for a MGB, would i be able to re-use any of this?

Also what internal modifications would have to be made to the carbs themself?

Any help would be great.

[tedmcedd]

the mg manifilds are too long and the float chambers hit the bulkhead and so they dont fit, i got some 1 1/4 mg su's and i have had to buy a new manifold.

[Tomf]

What part of these would fit on the bulkhead?



So it would these require me to mod the bulkhead?

Also where can i get a manifold from?

[tedmcedd]

ahhh those are differnt to the smaller 1 and 1/4 sus.... they dont seem to have foat chambers... hmmmm.... sorry! i thought they would simply be a bigger version of the ones i have... i got a manifold off here in the wanted section....

[Dog]

Ahh Twin HIF4's

Best carbs ever, full stop.

Normaly Manifold will fit, BUT you need to shorten the linkages, as the spacing is wider.
They DO hit the bukhead on some Minis, depends on what manifold your using.

The bottoms of the carbs hit the bulkhead, so a small Weber box type thing is needed.

[Tomf]

Cheers for confirming that Dog ill confirm with the guy that i want them now

Wheres the best place to order some needles for them? and what would be the best needles to order just to get it going until i can get it on a rolling road?

Also when you say about shortening the linkage, is this a case of cutting out some of the middle bar and welding it back together? or is there a tidier way of doing it?

[Dog]

Best bloke to ask would be Minivanman!
He had a chap do his... Dave something....... darn I'm *rubbish* with names... icklemini on 'finity...

Anyways, yeh, I think u just need to shorten them a bit, unsure by how much, but you do

Needles, well they are a HIF38 but twined... making them HIF4, not 44! 4... So just look for needles suited for HIF38 carbs, what needles u need however, is depending on your spec.

[minipac]

hi mate they look just like the pair I have just fitted to my 1098. the only thing I had to mod was both the corners of the manifold where the carbs fitted to as they touch the exhaust manifold and stop it from sealing to the head

[Tomf]

Cheers again for the reply. Is there a guide anywhere to find the needle that will need?

Or would anyboy be able to sugest a needle for the following spec engine:

1380
Ultra lightweight flywheel
metro ported head
Kent 286 cam
duplex timing gear
1.5 roller rockers

[Tomf]

hi mate they look just like the pair I have just fitted to my 1098. the only thing I had to mod was both the corners of the manifold where the carbs fitted to as they touch the exhaust manifold and stop it from sealing to the head

Cheers for the reply its good to hear that they might fit straight on, well with little mods.

Fingeres crossed these will go straight on.

[Dog]

Best bloke to contact would be ACDodd at MLMotorsport

Send him a email, he helped me out alot seting my Van and Voodoo up

[Dog]

hi mate they look just like the pair I have just fitted to my 1098. the only thing I had to mod was both the corners of the manifold where the carbs fitted to as they touch the exhaust manifold and stop it from sealing to the head

Cheers for the reply its good to hear that they might fit straight on, well with little mods.

Fingeres crossed these will go straight on.

They won't. Garenteed!
The linkages are too wide.

[minipac]

they might of been shorten before i got them . but that was all i had to do.

[Tomf]

Thanks ill send him a message now

[Dog]

they might of been shorten before i got them . but that was all i had to do.

You were lucky if they fitted striaght on then

Normally, if you get them straight off a MG, the linkages need tweaking.

I notice your from Herefordshire... where abouts?