Not if it's getting enough fuel from the 1 1/2 already, you wont have enough air speed to run twin 1 3/4 by the sounds of it with your motor so you'll lose low down power/torque and it will probably still drive badly. You're best off having the smallest carb that will supply the required amount of fuel.

Look at WHY it's not running with the 1 1/2 first.

_________________

Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

i reckon a single hs4 is alright on a standard motor but crap for a 1275 with any poke

dont mess around go straight for the hs6/hif44

or go a weber for the sound.

with twins it will only draw from one carb at a time and have a much better shot at the ports, so i dont see how twin hs6's would be worse than a single hs6?

There is some good info here on carbies and manifolds that may be helpful.

http://www.minimania.com/web/SCatagory/ ... ticleV.cfm

Single HIF44 or HS6 on a GOOD manifold for any road 1275 whether it be stock or very hot.

_________________

I would agree 100%

Like I said earlier, they used them on everything from the ultra fuel effecient 998 Mini Metro HLE (83 Mpg in 1981, independent AA test,, Austin Rover tried to suppress it as it was to contraversial)

Through to the Metro Turbo, (90 something Hp)... A real jack of all trades.

Wasn't the 998 Metro an HIF38?

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I believe it was, and the metro turbo had a special turbo carb. It had more seals so it didnt blow fuel through out the gaps when boost was applied.

But it was the same difference really.

_________________
Simplify and add lightness

There was a base model Metro 998 (HL) which did have an HIF38,, but there was an up market 998 version called the HLE which had a factory compression ratio of 10.3:1, a HIF44, and a special new design of inlet/exhaust manifold that was like a poor mans LCB type set up. The HLE had power windows, optional sunroof, Heated seats, optional trip computer and a few other things.

(I have one sitting in my shed)

The HIF44 fitted to the turbo models may have had extra seals but the performance from the carby was exactly the same. (As you said "same difference really")

well my problem is that it just seems to spit and splatter when you put your foot down, the car doesnt idle and blows black smoke.

is there any where in sydney i can speak to about getting the right carb for my engine? because it seems like the carb and EFI places i have been to do nothin but empty my pockets.

the engine is out atm and i will be investigating the carbon build up inside the intake and block (as the motor is still running once the car is switched off) is there anything which would be worth while looking at while this is being done?

black smoke,poor running, carbon buildup and dieseling on.... describes too much fuel to me. Lots of things to check. Could be fuel pump with too much pressure over coming the float valve or float valve stuffed or the mixture way too rich or the wrong needle giving too much fuel at idle and maybe elsewhere or the wrong jet in the carb or or or....eliminate all the possible causes until you find whats not right. Sounds like you need someone local to help you or sort it for you who knows Minis/SU's.

cheers

Kevin

i have known it has been running rich from almost day one and had it tuned a few time but everytime it works for a week than dies in the ass, i have been to a few different places and i am still out of pocket with a no running mini

need help finding someone who knows the mini SUs in the sydney area

PLEASE HELP

Take it to Mini Classic.

http://www.ausmini.com/forums/viewtopic.php?t=10543

Mini Classic (parts & mechanical repairs - Home of Australia's Fastest Group N Mini)
2/ 27 Hope St Ermington
Phone Greig (02) 9874 7211

_________________

+1

Master Malure will look after all mini riders!
And help with advice of Carb to choose and give it a well good tune

_________________
Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

Thanks Heaps

ill give him a visit

Not sure how they were over there... but in europe all 998 metros had an HIF38 on the same cast iron single piece inlet/exhaust manifold ( LCB design ) , the HLE had higher compression and taller gear ratios.

Cheers
Luis