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Intake Manifold Condensation

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jjwebb123 Wolfsburg Wizard

617 posts · joined Aug 2009 ·

#986935
I Noticed this afternoon whilst running the beetle that there were water droplets directly under the carb on the intake manifold,Like condensation. Just wondering if others experience that, and is it normal?

Look forward to your opinions. 😊
"A car for the people, an affordable Volkswagen, would bring great joy to the masses and the problems of building such a car must be faced with courage."
Adolf Hitler At opening of 1934 Berlin Auto Show

viiking Officially Full-On Dubber

253 posts · joined May 2012 ·

#986947
When you have a phase change from liquid to gas e.g. liquid petrol to vapour (or Liquid LPG to gaseous LPG) heat is released and any pipe in contact will cool.

Cool the pipe enough and the water vapour in the atmosphere will condense. The Dew Point of water vapour (the technical term) is temperature dependent. When the temperature of the pipe etc drops below the dew point of the water, droplets appear.

On the other hand, if your stand offs are too wide and it rains, you get the same effect. Ditto if you have driven through deep water.

cooky monster Learner Dubber

2 posts · joined Aug 2012 ·

#986949
Sounds like your heat risers are blocked

jjwebb123 Wolfsburg Wizard

617 posts · joined Aug 2009 ·

#986976
yeh well after about 10mins of running in the shed. I can touch
the heat risers and they are warm.not sure how hot they are supposed to be
too hot to touch?
"A car for the people, an affordable Volkswagen, would bring great joy to the masses and the problems of building such a car must be faced with courage."
Adolf Hitler At opening of 1934 Berlin Auto Show

jjwebb123 Wolfsburg Wizard

617 posts · joined Aug 2009 ·

#987033
My exhaust system doesnt have a hole in the exhaust where the heat riser pipe joins to the exhaust.( purchased new a few years back)
So no gases would be traveling through the riser pipes.

After a good drive they are really hot,too hot too touch. But that may explain why it is rough when cold,(big hessitation after starting/braking down) becuase the heat riser pipes are just as cold
as the manifold. But once it warms the pipe does, in turn vaporising the fuel better. She runs GREAT once warm. ( 5mins or so)

That would also explain the contant fouling of plugs. Becuase the plugs are getting pretty much liquid every start.

Just my thoughts.......What are yours???????????
"A car for the people, an affordable Volkswagen, would bring great joy to the masses and the problems of building such a car must be faced with courage."
Adolf Hitler At opening of 1934 Berlin Auto Show

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#987139
most old vw don't even have heat raisers, the water doesn't get in the motor. drive it more
try a hotter plug w10 instead of the w8
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car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲