adjysting mixture

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Nick-340GL
Posts: 25
Joined: 14 Jun 2014 08:17 pm
Location: oxford

adjysting mixture

Post by Nick-340GL » 28 Sep 2014 12:22 pm

My cars shit on fuel to the point where im putting £50 through it in a week to do about 120-140 miles. What can i do to improve this? Which way do u adjust the mixture screw to make it rich/lean?
1987 1.7 340 4 door saloon, 2" drop on 13s with a welder :D

macplaxton
Posts: 3283
Joined: 09 Feb 2008 02:29 am

Re: adjysting mixture

Post by macplaxton » 28 Sep 2014 09:07 pm

Go into your profile and add a signature. Put down what model you have, as it's more likely to get a response if people don't have to keep looking back or remembering what engine you have.

1.7? There are quite a few threads on shagged Z10 Solex carbs, there's even a practical guide in the technical section.

£50 means nothing to me (I don't know how much a litre costs in UK anymore) and for all I know petrol could be cheap/expensive depending on the grade and the local price. How many litres are going in, then I can work out the MPG. It sounds shit mpg-wise, but without putting some sort of figure on it we don't know precisely how shit it is. Again, what sort of miles is it? Local stop/start or motorway cruising? That can go +/- 30% either way.

Anyway, there is probably more work to it that just twiddling a screw.
72 DAF 44 Estate 78 Volvo 343DL Black BeautyImageImage
82 Volvo 343DL CVTImageImage 88 Volvo 340DL Diesel

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bogbasic
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Re: adjysting mixture

Post by bogbasic » 28 Sep 2014 09:08 pm

Hello, is that the good old 1.4?? Probably it needs new carb-to-inlet manifold gaskets which aren't too hard to get or copy and its worth checking for leaks in as many places as you can. You can listen for air leaks. CBA found that my 1.4 was visibly leaking petrol into the inlet manifold so I would have a look for that, too. Adjusting the screw on the 1.4 never did anything in my hands, really. Gasket sealant will help with air leaks, etc.

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: adjysting mixture

Post by Ride_on » 29 Sep 2014 02:51 pm

Yes proper figures please, mpg or km/l .

Assuming £1.30 per litre and using the best case 140 miles, gives 16mpg which does indicate a fault unless you are on a race track or treating the road as one.

Air leaks and float levels would be common problems with the Renault engines.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

Nick-340GL
Posts: 25
Joined: 14 Jun 2014 08:17 pm
Location: oxford

Re: adjysting mixture

Post by Nick-340GL » 29 Sep 2014 06:00 pm

I worked it out to be 90 ish (my mile counter doesn't work) on 15 litres of fuel, so works out to be around 25mpg from a 1.7 on a solex twin choke. Getting a set of bike carbs for it soon so that should improve it hopefully
1987 1.7 340 4 door saloon, 2" drop on 13s with a welder :D

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