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 |
nathansnathan |
Nov 9 2012, 10:02 AM
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#2
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Senior Member Group: Members Posts: 1,052 Joined: 31-May 10 From: Laguna Beach, CA Member No.: 11,782 Region Association: None |
Like I said they are the same, like kleenex and tissue, pretty much.
You may want to use a gasket on top of them too, on the manifold side. The stock fi spacers have a paper gasket adhered to each side, and the CB intakes, the facing where it mates is so far short of flat they have their own thicker gaskets. Just the paper ones don't work, and though the phenolic gives some degree of crush, I have found it better to use both. -not doing this, they will leak slightly. I've often thought that what people describe as the dellorto howl was just a bad seal there, as it's the only time I've heard it, running paper gaskets. I think the special gaskets without the cutout or the silicone- in-the-recesses trick might be just misled. |
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