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| evil vacuum leak https://slantsix.org/forum/viewtopic.php?t=23437 |
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| Author: | saskatchewan [ Sat Jun 02, 2007 7:58 am ] |
| Post subject: | evil vacuum leak |
Hello I have a Holley 390 that I have been running on a 225 slant six with an Offenhauser manifold. There is a persistent vacuum leak that seems to come from the gasket between the manifold and the carburetor. When ever I change the gasket the leak stops for about an hour and then starts again. This leak is on the inside edge of the gasket and causes a very loud whistle sound. If I spray some carburetor cleaner in the mouth the the carb the whistle will stop for a while then come back. I am wondering, would a rebuild stop this? Could this leak be due to something being warped? Am I just using the wrong type of gasket? Thanks |
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| Author: | slantzilla [ Sat Jun 02, 2007 11:15 am ] |
| Post subject: | |
Are you sure it is not between the carb mounting plate and manifold? I have had the plates leak and do the same thing. I always seal the plate straight to the manifold with silicone. What type of carb mounting gasket are you using? I have always used the gray paper ones and not had any problems, even when I re-use them 10 times. 
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| Author: | saskatchewan [ Sat Jun 02, 2007 6:19 pm ] |
| Post subject: | |
Hi Thanks, I think that the problem is that since I put a so called "dropped bottom" air cleaner on that too much heat is being trapped and that the gasoline is actually boiling!!! The the whistling sound. I am going to try to put on an insulating gasket and a regular air cleaner. |
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| Author: | LUCKY13 [ Sat Jun 02, 2007 6:54 pm ] |
| Post subject: | |
The noise could even just be the throttle plates. When it is making the noise can you spray carb cleaner at the base & detect the leak. Or is it just noise. jess |
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| Author: | saskatchewan [ Sat Jun 02, 2007 10:05 pm ] |
| Post subject: | |
Hey I tried my idea of using the non dropped bottom air cleaner and that did the trick. I also put on some special insulating gasket from Mr. Gasket and that may have helped as well. |
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