Crankcase Breathers |
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Crankcase Breathers |
McMark |
Sep 12 2017, 04:58 PM
Post
#41
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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) |
Elliot Cannon |
Oct 28 2017, 12:14 PM
Post
#42
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None |
My engine was built by FAT Performance 14 years ago. They included a Bugpack breather they said to mount high on the firewall. They installed (or had already been installed) head vents. They advised that I install hoses between the head vents and the side ports on the breather and between the oil filler neck and the center port of the breather. I'm guessing (because I never kept track) that the engine has between 40 and 50 thousand miles and still runs great. 147 hp @ 5300rpm. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/driving.gif) I don't know if this is the best way to do this but I do know that it has worked great for a long time. I just thought I would add some more anecdotal food for thought. (IMG:style_emoticons/default/idea.gif) Plus I like posting pictures of my car. (IMG:style_emoticons/default/wub.gif) (IMG:style_emoticons/default/av-943.gif)
Attached image(s) |
bandjoey |
Dec 30 2017, 10:28 PM
Post
#43
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bandjoey Group: Members Posts: 4,926 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
My engine was built by FAT Performance 14 years ago. They included a Bugpack breather they said to mount high on the firewall. They installed (or had already been installed) head vents. They advised that I install hoses between the head vents and the side ports on the breather and between the oil filler neck and the center port of the breather. I'm guessing (because I never kept track) that the engine has between 40 and 50 thousand miles and still runs great. 147 hp @ 5300rpm. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/driving.gif) I don't know if this is the best way to do this but I do know that it has worked great for a long time. I just thought I would add some more anecdotal food for thought. (IMG:style_emoticons/default/idea.gif) Plus I like posting pictures of my car. (IMG:style_emoticons/default/wub.gif) (IMG:style_emoticons/default/av-943.gif) .? Is the hose to the oil filler port going through a pvc or just straight into the oil filler? |
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