Icing up -Twin solex on 1800 Kombi

GTMac Fahrvergnugen

976 posts · joined Nov 2004 · 10 Aug 2006, 7:34 pm

#520963

If one of the carbies is icing up around the intake area what does that mean?

1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 10 Aug 2006, 8:01 pm

#520987

The fuel vapour is turning back into a liquid

Heat is being absorbed as there is a change in state from a gas to a liquid.

Unusual in a twin carb - runners are too short.

Not uncommon on centre mount carbs where the manifold is long and not enough heat from the heat risers

Futue te ipsum!!!

Menangler Custom Title Time!

1,991 posts · joined Aug 2002 · 10 Aug 2006, 9:02 pm

#521022

Are you running a stock air cleaner? or a Donaldson one

FAHRVERGNUGEN;
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Experienced when a car and it's driver are in mutual harmony, A unique driving experience, Pleasure, Satisfaction,
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GTMac Fahrvergnugen

976 posts · joined Nov 2004 · 10 Aug 2006, 9:32 pm

#521036

Menangler wrote:Are you running a stock air cleaner? or a Donaldson one

Just stock.

1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.

aggri1 Insano Dub Head

824 posts · joined Dec 2003 · 11 Aug 2006, 7:58 am

#521134

That's odd, I've never had a problem even on very cold mornings (on a stock 1800 too). Are you sure that it's doing that? What makes you believe it's icing up?

GTMac Fahrvergnugen

976 posts · joined Nov 2004 · 11 Aug 2006, 12:43 pm

#521180

aggri1 wrote:That's odd, I've never had a problem even on very cold mornings (on a stock 1800 too). Are you sure that it's doing that? What makes you believe it's icing up?

Simple...........when I open engine compartment you can see the ice forming like morning dew on the manifold.

1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 11 Aug 2006, 1:29 pm

#521195

Any chance of a vac leak there some where???

Futue te ipsum!!!

aggri1 Insano Dub Head

824 posts · joined Dec 2003 · 11 Aug 2006, 1:43 pm

#521199

GTMac wrote:
aggri1 wrote:That's odd, I've never had a problem even on very cold mornings (on a stock 1800 too). Are you sure that it's doing that? What makes you believe it's icing up?
Simple...........when I open engine compartment you can see the ice forming like morning dew on the manifold.

Wow, actual ice! I take it the air's pretty humid then... Still makes me wonder why it's that bad though, I've never seen ice, just condensation.

When were the throttles last balanced? Or the idle circuits for that matter? If it's sucking harder and therefore expanding the air more on one side than the other, then that would result in a greater temperature decrease. I imagine that if the throttles weren't opening the same amount, then this might happen...

[ Edited on 11-8-06 by aggri1 ]

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 11 Aug 2006, 3:06 pm

#521212

Hmmmm.... what about the bushings in the rod in the linkage.
They get shot and the carbs could be opening all over the place.

Just a thought

Futue te ipsum!!!

GTMac Fahrvergnugen

976 posts · joined Nov 2004 · 11 Aug 2006, 6:28 pm

#521286

Bizarre wrote:Hmmmm.... what about the bushings in the rod in the linkage.
They get shot and the carbs could be opening all over the place.

Just a thought

There is slight play in the butterfly shaft but I didnt realise such a small amount of movement would effect the air mixture etc. so much. Forget about when its cold, its a nightmare but when at normal operating temps, when you release foot to change gears you cant ease back on the pedal, you have to flaten it or it will hesitate and splutter.

1971 Type 3 Fasty - EJ20T

I love 242HP sleepers. 🤪

How many sets of lights does it take a $229k Carrera S to learn? 😂 UPDATE: Cayman S, M3, B4 now added to the list.

kombidaze Slammed & Awesome Dubber

83 posts · joined Aug 2003 · 11 Aug 2006, 10:24 pm

#521392

if my motor was performing like yours i would do and or check the following
rebuild the carbies, including rebushing throttle shafts if badly worn, with rebuild kit about $60 - $70 covers both carbies check the float level and make sure the accelerator pumps are working correctly also the inlet manifolds for leaks at the heads and check all vacuum hoses for cracks and they should all be clamped up, also check the solenoid shut off valves on sides of carbies if they don't work the idle suffers badly also replace the plugs and points is the coil in good shape and are the plug leads ok? check the timing and do the tappet clearances.
a bit of a list but try one thing at a time and see if it improves.