Carb tuning

[ah_sprite]

Hi all
I (think I have) managed to adjust my carbs so the car is idling well, using the four idle control screws. However, the car refuses to run properly at all under any load whatsoever, unless the engine speed is increased very slowly.

The timing appears to be okay, what else could be the cause of the problem?

Richard

[ColinMarr]

Richard,

It sounds like the idling jets are clear and working OK, but other jets inside the carbs at the bottom of the float chambers may not be. Also, the accelerator pumps underneath the carbs may not be functioning. If the carbs have been refurbished then the diaphragms for these pumps should have been replaced and the push-rod linkages that work them should have been checked.

Think yourself lucky you are not trying to fix this with a sideways opening bonnet as on early Sports!

Regarding your other question about engine oil - I favour Fiat/Selenia HPX. There have been other posts on the Forum about this oil – it is 20/60 semi-synthetic, not hugely expensive and does what it’s supposed to do, which is good for old engines.

Colin

[fay66]

No connection to them but having just Googled it http://www.shop4parts.co.uk/?name=store&op=Details&prodID=5063&sku=12478
Have it for £27.54 inc Vat which seems to be £3-£4 at least cheaper than anywhere listed, unless Colin knows different

Brian
8227

[ah_sprite]

Thanks for the replies, chaps.
Done some more investigation and it would appear that you are indeed right - the acceleration side of things isn't delievering any fuel. The pumps seem to be working correctly, however.

Just had the carbs off the cars and in bits - cleaned out all of the jets and plunger bearings as far and as well as I can, they were very full of crud indeed. Hopefully that will have sorted my problems.

Out of interest, is there anywhere that will supply single parts for carbs, such as, say, a new diaphragm or a new main jet?

Many thanks for the input
Richard

[lancialulu]

New Solex Main jets (whats wrong with yours?) are not readily available but recon kits with all gaskets and diaphrams are nearly always on ebay c £30.
Tim

[roddy]

Hello Richard

I have found that eBay shop :- http://stores.ebay.com/ALFA1750S-CARBURETORS-PARTS-STORE   in Italy are very good at supplying Solex parts, including jets.   English seems to be understood, and they offer a very good service, in my opinion.

Regards - Roddy