 Plumbing Question #2 |
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| Porsche Rescue |
 Apr 29 2003, 08:35 AM
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Saving and Enjoying Old Porsches  Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None  |
Now that I have a handle on Weber fuel plumbing, I am moving on to oil vapor hoses. The engine I am installing is my first with carbs. Can someone tell me what the two small open pipes beside the intake manifolds are for? I assume they are on stock FI engine and I just never noticed them.
I believe I need some sort of vapor cannister (have seen one made by K&N). Do I connect it to the plastic nipple at the oil filler and then to the two nipples at the manifolds? Is this a crankcase vent system? Is there a PCV valve needed? By now you can tell that I'm not real sure I know what I'm doing! |
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| Brad Roberts |
Apr 29 2003, 04:10 PM
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Air/oil is being pumped out of the engine by the backwards motion of the pistons (internal crank case pressure) If you block off ALL the ports from the heads/block.. it will leak oil like a MF'er. It will try and blow out of any seals that it can.
Racers run belt driven vaccuum pumps and pull 14 inches of vaccuum on the heads and block (if the engine isnt dry sumped.. dry sump setups will use one stage of the pump to pull vaccuum) This free's up HP by countering the internal pumping loses. We get the similar effect by running the stock 2.0 air cleaner. I would rather free up HP than have a "cone" style filter that doesnt allow me to pull some vaccuum on the heads/block. The fan shroud has one fresh air port and the drivers side tin has a fresh air port... these supply air to the 2 black lines that run to the charcoal canister to help delute the fuel vapers. This is the only two ports that actually supply air... the rest are for out going air. B |
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Posts in this topic
Porsche Rescue Plumbing Question #2 Apr 29 2003, 08:35 AM
tryan my opinion, put filters on each vavle cover or fee... Apr 29 2003, 11:20 AM Porsche Rescue Tryan, thanks, but can we keep it a little more si... Apr 29 2003, 11:41 AM Brad Roberts Jim,
Are you working on a 6 or a 4 cyl car ?? Our... Apr 29 2003, 11:50 AM Porsche Rescue Brad,
Thanks. I am installing a 2.0 4cyl with dual... Apr 29 2003, 12:00 PM Brad Roberts Correct.
I use a CB performance block.
I was foo... Apr 29 2003, 12:03 PM Mike D. I thought the whole Idea was (in FI world anyway) ... Apr 29 2003, 12:34 PM MarkV So on my carbed 2.0 4cyl car there are vacuum port... Apr 29 2003, 03:10 PM Brad Roberts One more thing... if you have a carbed engine that... Apr 29 2003, 04:16 PM
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