What is carburetor percolation..., How can I take care of this annoying problem |
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What is carburetor percolation..., How can I take care of this annoying problem |
nsr-jamie |
Nov 5 2012, 08:31 AM
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#1
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914 guy in Japan Group: Members Posts: 1,182 Joined: 7-November 07 From: Nagoya, Japan Member No.: 8,305 Region Association: None |
Hi, over here in Japan where it is much hotter and humid than the rest of most parts of the world. My car is a 1972 914-4 model that has been tuned up a bit with 103mm p/c, high can and big valve heads (48x38) and twin 40mm drla Dellorto carbs....in the summer time the car seems to run badly and when I stop the car for even a short time to run into the 7-11 and try to restart the 914 it sometimes is quite difficult to get it running again. I talked with my mechanic friend at my local air cooled VW shop here and he told me I was experiencing carburetor percolation which seems to be common on these cars or air cooled engines that are running carbs like mine. I did a bit of research and found nothing here on this site but a little bit on google....not really sure what carburetor percolation is but kind of sounds like the carbs are over heating from the engine heat. Are others experiencing this problem too and if so what are you doing to try to fix it. My shop mentioned special gaskets or spacers to go in between the carbs and manifolds to cure this problem...it seems to occur more here on this side of the planet cause of the humid and hotter weather compared to say back home in the US or Europe. I checked on the CB Performance site and could not find spacers.....any body have any input to add? Thanks and cheers
Jamie in Japan |
nsr-jamie |
Nov 9 2012, 09:38 AM
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#2
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914 guy in Japan Group: Members Posts: 1,182 Joined: 7-November 07 From: Nagoya, Japan Member No.: 8,305 Region Association: None |
Ok, here are some pictures as promised. I finished one set this week.
Picture one shows the material I am using which may be bakelight...I actually got it for free from our spot welder operator as he no longer needed it. Thats how I got it with the holes in it already. Another one but close up. Is this really bakelite or is it Phenolic? I believe they are the same material. |
SirAndy |
Nov 12 2012, 02:11 PM
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#3
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Resident German Group: Admin Posts: 41,815 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
What about the bottom piece that goes between the heads and the manifold? I think that's even more important than the pieces between the manifolds and carbs.
On my carbed 2056, i ran the stock FI phenolic spacers between the heads and manifolds and just a paper gasket between the manifolds and carbs and i never had an issue with fuel boiling ... (IMG:style_emoticons/default/popcorn[1].gif) |
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