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 7 2012, 05:29 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 |
Seems like lots of guys in Japan are using bakelight with their air cooled cars...today after work I cut 4 pieces of them on the band saw and drilled out the stud bolt holes on the mill today so they are perfectly pitched. I am going to make some kind of jig for them either tomorrow or the day after when work is done and hope to maching a few pairs of them. The material is very soft and I tested with a carbide endmill and it turned out much cleaner than I expected. I'll try to get some pictures this weekend and let others know how they work out. This is kind of fun...
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DBCooper |
Nov 7 2012, 07:28 PM
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#3
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
Seems like lots of guys in Japan are using bakelight with their air cooled cars...today after work I cut 4 pieces of them on the band saw and drilled out the stud bolt holes on the mill today so they are perfectly pitched. I am going to make some kind of jig for them either tomorrow or the day after when work is done and hope to maching a few pairs of them. The material is very soft and I tested with a carbide endmill and it turned out much cleaner than I expected. I'll try to get some pictures this weekend and let others know how they work out. This is kind of fun... Maybe there's a difference in terminology then, because Bakelite was a brand name and one of the very early plastics, from the first part of the last century. It was black and very hard and brittle, not soft, typically used for molded electrical connectors and components. I wasn't even aware it was still being made. Whatever you call it, if what you have is soft, you can machine and it will insulate then it will work. |
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