i have tryed and tryed over and over but i just cant get the floats to be where there suposed to be and its doing my head in cuting out on every corner so im looking for a new carb i really want to do the bike carb conversion and i will do it but for now i would be happy with it running right and conering like a demon so im keeping my eyes open for a replacement and was wondering if enyone could tell me what webber's or any other carbs will bolt strait on as i dont really know what im looking for as im sure thay all fit different manifolds?

thanks for the help and advise

No double webber would bolt on straight on. You'll need a rebuild inlet manifold. Easy solution: Search for a Volvo 4xx carb. These carb's work great on a 1.7 I heard

Already tried buying a new float from Renault?
The most probable reason for you not getting the float right (and all the mentioned problems!!!) is that your float ain't floating anymore. Please try that first.
Oh, and get the mixture re-set properly afterwards, it'll probably run terribly lean or horribly rich (I just keep forgetting which way the carb is being adjusted to counter the sinking float).

Have you tried checking/changing the needle valve? i had an idle problem on a carb i rebuilt, i changed the new needle valve for the original one and it seems to have cured it. If the valve is sticking chances are the carb is flooding.

it's an ancient thread but still of great value for reference:

http://forum.volvo300club.nl/showthread.php?t=634

check the pictures in the first post to compare the condition of your float.

I used a simple tin with water, to see how much buoyancy the floats have.
left float = new, right float = knackered.

If the level of floating is ANYTHING ELSE than what you see on the left (barely touching the water, that is) the float MUST be replaced.


another method of checking the float is to blow it dry and put it on a sensitive letter scale. it should be 6 grammes plus/minus one.
in practice its weight will only go up (petrol being sucked into the plastic foam) so anything above 7 grammes is forbidden.

the one on the right was about 10 grammes at first, after drying for a week or six it went down to about 8,5


If you need a new one:

the renault dealer can supply one, too.

Renault part number 77.01.031.047
the item is called 'float kit' and consists of the float itself and a variety of mounting shafts, all of which are useless

counter price in 2004 was: 40,72 euro

back then i got 30% off because of a screwup at an earlier parts deal.

Has anyone actually put a 440 carburettor on a 340 1.7l ? Tricky? Result?

Dunno, but I have a 340 1.7 carb sat here if anyone wants it. I believe it was heading towards needing a rebuild (dubious running when cold rings a bell), but the car seemed to run ok, and I saw it doing 30-odd miles.

cheers

James

I'm sure someone used a 440 carb and had good results, but I can't remember who. I have a feeling they were from Spain or somewhere...

EDIT: Google to the rescue, it was 340cbr from Portugal.

http://www.volvo300mania.com/forum-uk/v ... ight=[url]

Well I think it is worth a try if I can get a 440 carby that bolts straight on. What do you all think of this theory: Because the inlet manifold is not heated, when it is still cold the vapour condenses on the inside and causes the motor to stall and backfire. The pressure of the backfire then causes the carburettor to flood which then wets the spark plugs and prevents restarting for 20 minutes or so until they dry out. I have observed fuel being ejected from the carburettor after a backfire.

They don't do that by design...but carb icing can occur (similar result), and most cars will 'fire forwards' through the intake when running too lean...often throwing out some fuel in the process!

cheers

James