Condensation on carburettor

Hi all, looking for some advice, our 1974 bay "Marge" has a problem on long journeys, during a recent run to Croyde and up and down the monumental hills she started to run badly then cut out. On opening the engine lid there was condensation on the carb, we let her rest for 15 minutes and then carried on with no issues, same problem on our return, any thoughts or advice would be greatly appreciated


Sent from my iPhone using Tapatalk

 

Info like engine type, carb type, air filter type would be most useful.
Or a picture!

 

Hi Flakey, thanks for replying, it's a 1600 TP with standard Solex carb and pancake filter, picture shows as it is now prior to rebuild 2 years ago


Sent from my iPhone using Tapatalk

 

Sent from my iPhone using Tapatalk

 

Pancake filter is not helping and probably exhaust heat risers to manifold blocked

 

Agreed ^

 

Thanks both, I'll check it out at the weekend


Sent from my iPhone using Tapatalk

 

My heat risers were not getting hot and it was due to the exhaust not being drilled were it met the heat risers.

 

^agreed x 2. If you can find a good original airfilter with warm air preheat, fit it, or you'll suffer from manifold chilling that will make your van grind to a halt. Feels like a big flat spot.

 

http://www.vw-resource.com/icing.html

 

Could that also explain the flat spot at low revs ?


Sent from my iPhone using Tapatalk

 

Read that link plus the link on that to the heat riser article ^^

 

Possibly. If airflow is chilling that big T-shaped manifold, fuel will condense out of the mixture onto the manifold walls, causing a flat spot.

 

are you running a doorstop ? (009 dizzy )

 

You have an almost identical setup to me, make sure the heat risers are free flowing. you will get some condensation on the outside the problem starts if it ices up inside and then stops the engine !

 

The heat from the exhaust via the heat risers warms the inlet manifold
This helps keep the fuel suspended in the air as it goes through the manifold.
If your heat risers are blocked and the ambient temperature is low
Then the fuel struggles to stay suspended and pools on the walls of the inlet manifold
The wet of the fuel on the manifold with cold air passing over cools the manifold even more
Until it gets cold enough for water vapour in the air to start condensing on the outside of the manifold and as the cycle continues it starts to freeze.
Your heat risers need to be free flowing so the exhaust gas can warm the manifold and starting on cold mornings is helped with the hot air feed the standard airbox has to it.

 

Hi, yes it's an 009

 

Fence. Throw over.

 

Not keen then


Sent from my iPhone using Tapatalk

 

Three things to throw away immediately after getting your bus:

- pancake air filter
- 009 dissy
- cheap Monza exhaust