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Home > Technical Chat > adjusting the mixture on a na hif44 carb??

JT

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Hertfordshire

10th Apr, 2008 at 07:23:01pm

hi

is there a way to adjust the mixture on a normal hif44 carb?
like a mixture screw or somthing?

if so were abouts is it??



cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

wil_h

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Betwix Harrogate and York

10th Apr, 2008 at 07:57:07pm

yes, its the screw behind and a bit below the fuel-in pipe.

Clockwise for rich, anti-clock for lean.

This screw is for adjusting the tickover mixture only. Once it is set correctly, the rest of the fuelling is determined by the needle profile.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Jay#2

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Northern Ireland (ex AUS)

10th Apr, 2008 at 07:58:19pm

Ah, on the mater cylinder side nearish the back. It's a flat head screw that also take a philips, like the idle ajusting screw. It's tight to get at though.

On 7th Nov, 2008 Nic said:
naeJ
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!!!!!!sdrawkcab si gnihtyreve ?droabyekym ot deneppah sah tahw ayhwdd


JT

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Hertfordshire

10th Apr, 2008 at 08:59:03pm

so theres not one that adjusts the whole mixture.

its just that i have a needle in my 1380 that it runs with fine but its a bit rich.
and it doesnt like to idle all the time! i dont need any choke to start it up even with the standerd mg metro needle in it.

im going to conect the flywheel breather to it as at the moment i have it going to atmosphear and blocked off the breather pipe on the carb. the crankcase will have a filter on it as its a differnt size from standerd (25mm).

any ideas?

hope that makes sence??

cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

Turbo Phil

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Lake District

10th Apr, 2008 at 09:40:30pm

The needle profile dictates the fuelling. You set the mixture at idle to be correct, then it's the profile of the needle which controls how much fuel passes through the jet.

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Paul R

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Swindon

10th Apr, 2008 at 09:57:42pm

be carful though i set my carb up accidentaly using the mixture adjust screw through the revs instead of a diffrent needel (first time i had done it) and my car runs crap atm. i may re-conect one of my breathers to the carb as it seems twin breathers dont work as well for me atm.

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wil_h

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Betwix Harrogate and York

11th Apr, 2008 at 03:00:04pm

On 10th Apr, 2008 josh_tacon said:
so theres not one that adjusts the whole mixture.
cheers
josh


Well in theory, if you move the screw it will affect the mixture throughout the rev range. But it really should be used to set the idle mixture, then the rest is controlled by the needle profile.

As a quick fix you cold give it a turn and see what happens

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.

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