5 replies to this topic

[andrew1986mini]

Hi i have a 1990 998 rover mini

I was wondering if i can fit twin su carbs on my car

What size carbs would be required? As i am not 100% on which carb i have now it has the adjuster underneath and float bowl on the left side!!

Will this give a litlle more power?(obviously i am gonna be taking it to rolling road if this can be done)

Can i just get 1 carb, twin inlet mainfold, and a link kit to link mine and new carb ?

Or will it be better to pick up a set of carbs and overhaul them?

If i do decide to do it will i have to modify the bulkhead to fit or will the inlet manifold be slightly smaller to make it so that i can fit the carbs in the tiny hole at the back as my single carb at the moment doesn't seem to have much space

[Big_Adam]

To be honest, you'll be better off with a Stage 1 kit, which you can buy / make up from ebay bits cheap.

Probably not as cheap as a set of leaky twin carbs but its going to be better for you car.

[bmcecosse]

Don't bother with twin carbs - that's not your best way forward. Good inlet manifold/air cleaner and a decent exhaust using the carb you have will be fine. Then you are looking at a better head - then a camshaft change - and then possibly a larger single carb. That's the way forward!

[Big_Adam]

Don't bother with twin carbs - that's not your best way forward.

Woah now, I wouldn't go that far. I rather like the throttle response on twin carbs. Nice to drive with if you feel like hooning about. But, for a first addon go with exhaust etc.

[huw_jenks]

Twin carbs look very cool indeed, but without a stage one kit there will be little (if any) benefit.

It sounds like you have a HS4 carb (1.5"), but a twin carb setup for a 998 would usually use two HS2 carbs which are 1.25".

As for buying a manifold and another carb, it would be difficult as the twin manifold will use a left and right carb, which will have the float bowl and throttle linkages on opposite side.

If you want to improve the performance of your 998 a bit then put the twins further down the list and look at Stage One, cylinder head, camshaft. Normally in that order.

[MRA]

Look for restrictions within the system.......

1) Air filter
2) Exhaust system
3) Inlet manifold
4) Cylinder head
5) Ignition system (ECU if money etc available)