Crankcase Breathers |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Crankcase Breathers |
McMark |
Sep 12 2017, 04:58 PM
Post
#41
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I was looking at the factory manuals and talking with someone about crankcase breathers. We were talking about breather setups for carbs specifically. And I realized as I was looking at the breather diagram that it appears that the breather ports on the heads were included to supply extra air to flow through the engine case. And then I read this little snipped in the manuals which seems to support my thought:
QUOTE Crankcase ventilation has been considerably improved in the engine by ducting fresh air from the air filter. This modification reduces crankcase condensation and icing at low outside temperatures. So following that logic... If the crankcase breather (at the oil filler neck) isn't connected to a vacuum source, then the ports at the heads should/could be plugged instead of connected to a breather box. Thoughts? Contradictions? Agreement? I realize people have been connecting breathers all sorts of different ways and most work just fine. I'm more interested in the theory aspect, and refining an 'ideal' installation since we already know many ways to 'make it work'. Attached image(s) |
michael7810 |
Sep 12 2017, 06:30 PM
Post
#42
|
Senior Member Group: Members Posts: 1,081 Joined: 6-June 11 From: Scottsdale, AZ Member No.: 13,164 Region Association: Southwest Region |
I had crankcase and head vents tied directly into my air filter lids until recently when I installed Gold Wing air filters. Now I tied the 2 head vents together with a single hose (what I read from Jake Raby a while back) and vented the oil filler housing overboard (thru tin under the engine). Eventually I want to get a breather can for the oil housing vent. I drove the car to ~1800 miles to WCR and back with no adverse effects that I know of. Didn't use any oil that I could tell and I had expected it to use about as quart based on previous trips with the old configuration. I'm leaving tomorrow for RRC and that will be about 2K miles with the new configuration. I'll report back if the results were not the same as WCR. I have a 1911cc with webers.
|
Lo-Fi Version | Time is now: 10th June 2024 - 12:37 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |