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psalt psalt is offline
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Join Date: Mar 2006
Posts: 1,107
Hello Spence,

Some by blow is normal and it does increase with age. Getting the hot vapor and oil out of the intake air is a good thing, they both have the effect of lowering the mixture octane and the knock limit. Take a lesson from the pre-60's road draft breather and use a couple of 90 degree bends in you breather tube before the filter. The idea is to have a large diameter tube to keep the velocity down and the suspended oil will crash into the 90's and drain back into the tank. On a 911 oil tank, I use two 90 degreee 3/4" copper fittings soldering into a "Z", then a small K& N filter. Adjust the fittings so that the breather is at the highest point, then solder them together. The filter will no longer drip oil if mounted correctly.
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Paul
Old 11-26-2008, 04:05 AM
  Pelican Parts Technical Article Directory    Reply With Quote #11 (permalink)