Solex Carby

**101RRS** · 26th April 2013, 07:09 PM

This relates to my Haflinger but I will post here as it is a carby issue and the carby is similar to that on a spreadbore 2 litre.

My Haflinger has a Solex 34 PCI carb which is very similar to the Solex 32 (?) on series 1s so the issue I am having might be similar on landies.

Basically when going up steep hills and you are in too high a gear and revs drop off (it is almost impossible to go from second gear to the krawler 1st gear on the move in a Haffie) it feels as if the the engine over fuels and then dies and will not start on the slope so you have to back down to get level. If you are in the right gear and revs are kept up - on a Haflinger this means over 2000rpm there are no issues irrespective of the slope - so I think the issue relates to too much fuel at low revs on slopes.

Otherwise the engine runs fine.

Any ideas on what I should be looking for - eg float levels, mixture adjustment etc

The engine has a big bore kit in it so it 762cc instead of the normal 635cc and the Zenith dual throat carby has been replaced with the solex and an electronic ignition system with a coil pack is fitted. The mechanical fuel pump has been ditched in favour of an electric unit.

Thanks

Garry

**series1buff** · 26th April 2013, 09:24 PM

Hi

it could be because the float chamber is pointing towards the wrong side e.g., if you read the Solex booklet Mark posted a link to

http://vintagebus.com/parts/pdfs/solex.pdf

- it states that the float chamber should be on the forward /front end of the vehicle . Flooding can occur during uphill driving if the float chamber is not oriented correctly .

Mike

**101RRS** · 26th April 2013, 09:51 PM

Originally Posted by series1buff

Hi

it could be because the float chamber is pointing towards the wrong side e.g., if you read the Solex booklet Mark posted a link to

http://vintagebus.com/parts/pdfs/solex.pdf

- it states that the float chamber should be on the forward /front end of the vehicle . Flooding can occur during uphill driving if the float chamber is not oriented correctly .

Mike

Thanks - the float chamber is orientated the same as the landie - towards the front of the vehicle.

Cheers

Garry

**bee utey** · 26th April 2013, 10:37 PM

Funny I was talking about odd carby problems the other day, has your carby got a warm air feed? In cool damp conditions the idle air corrector jets can ice up and cause it to run rich until warmth gets back into the carb top. I used to have endless troubles with an off road dune buggy on cold nights doing that. I made a warm air feed off the exhaust manifold for it.

**101RRS** · 26th April 2013, 10:46 PM

Originally Posted by bee utey

has your carby got a warm air feed?

Yes the two exhaust manifolds are joined by a large pipe that the carby sits on so keeping it nice and warm on cold days.

Cheers

Garry

**bee utey** · 27th April 2013, 02:33 PM

Originally Posted by garrycol

Yes the two exhaust manifolds are joined by a large pipe that the carby sits on so keeping it nice and warm on cold days.

Cheers

Garry

Most carbies are fitted to heated manifolds, essential for operation at load, I meant is the air going into the top of the carby heated?

**101RRS** · 27th April 2013, 02:41 PM

Sorry - misunderstood - no the air is not heated - currently sucking air from inside the engine bay - will be a bit warmer than ambient due to heating of the air in the engine compartment from the engine.

Garry

**Hartley** · 28th April 2013, 08:24 AM

is it mechanical fuel pump? Perhaps starves fuel at times of higher demand if you run with low revs?

**101RRS** · 28th April 2013, 11:55 AM

Originally Posted by Hartley

is it mechanical fuel pump? Perhaps starves fuel at times of higher demand if you run with low revs?

That is a problem that does happen with the standard mechanical system but mine has an electric pump. The pump is able to provide enough fuel at all revs.

In fact it feels as if I have the opposite issue - at low revs, high load the engine seems to be overfuelling and stalling the engine. Maybe the float is set too high but is OK on the flat but on the slope the excess fuel is flooding the engine - not a problem when revs are high as the excess is used up but at slow revs with the foot down.

I was hoping someone with a series 1 may have experienced a similar issue and found the cause.

Here is a vid of the issue - I had to back down the hill to a flatter spot and then the engine slowly came back to life - seemed like it was flooded. I then engaged the krawler gear and did the climb ok - just a bit noisy and high revs.

[ame]http://i42.photobucket.com/albums/e334/gazzz21/Forum%20Posts%20Album/EngineStopping_zpsf4da9a0e.mp4[/ame]

**wrinklearthur** · 28th April 2013, 06:06 PM

Secure that vehicle where it has stopped and jump out quickly as you can, undo the fuel cap listening for a inward rush of air.

If the tank breather isn't working the vacuum inside the tank reduces to the point the fuel pump stops drawing.
.

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