 Too much pressure?, Still leaks some |
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| Wew |
 Dec 31 2023, 02:14 AM
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Member  Group: Members Posts: 236 Joined: 17-January 15 From: Novato, ca Member No.: 18,335 Region Association: None  |
Hi all
Engine is a 1973 2.0 with a 2056 build. I purchased a cam that was more aggressive for spirited driving no track and just large enough to maintain the car running fuel injection DJet. New heads with no vents. purchased the oil tower and air box for a 1975/76 as the bigger breather opening was recommended. I am still experiencing some oil leaks one that sits at the base of the head near the number 4 spark plug. Plug is not leaking. Also some oil on the thermostat spring mechanism. Valve covers have had inner lip welded and 914 rubber cork gaskets. I bought this canister to help with the pressure and hopefully remedy the oil leaks.  I have been unable to find an example of how to route the hoses for this when installed. Any advice or pointing me in the right direction would be appreciated. |
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| technicalninja |
Dec 31 2023, 12:57 PM
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#2
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Advanced Member Group: Members Posts: 2,531 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region 
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QUOTE(r_towle @ Dec 31 2023, 12:28 PM)  no vents on the heads may be a bit optimistic. Lots of pressure up there that needs to go somewhere. Its either out, or past the valve guides They share atmosphere through the pushrod tubes. Actual pressure in the valve cover should be exactly the same as at the fill tube. Now, he's RIGHT!!!! You should have circulation throughout the engine! Actively reducing crankcase pressure ALWAYS help any engine... High end drag race set ups will often have a dedicated vacuum pump (that dumps to the atmosphere-not for emissions at all!). This pump reduces crankcase pressure to assist in the sealing of the rings. They pull pretty HARD! I'm planning on running the head ports as inlets and the crankcase port as suction. I want fresh air in at heads and out at fill tube/dedicated crankcase port high on the motor. The output I'd run to a catch can as you have now. I'm planning on venting the catch can (vapor side only) to manifold vacuum through either a fixed orifice or maybe a PCV valve. This set up only works properly with a plenum-based intake. ITB guys have more trouble with this. I'd normally just vent to atmosphere through catch can with ITBs. Venting the catch can to atmosphere is the easy button... |
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Posts in this topic
Wew Too much pressure? Dec 31 2023, 02:14 AM
mate914
Hi all
Engine is a 1973 2.0 with a 2056 build. I ... Dec 31 2023, 07:32 AM
Wew Just splice the line of the big breather hose betw... Dec 31 2023, 11:48 AM r_towle no vents on the heads may be a bit optimistic.
Lot... Dec 31 2023, 12:28 PM technicalninja Not enough info for me yet on this one to help.
H... Dec 31 2023, 12:40 PM Jack Standz Might find this useful (from Len Hoffman and Jake ... Dec 31 2023, 01:19 PM technicalninja Bingo! That's a great article!
Only o... Dec 31 2023, 01:59 PM Jack Standz Some increase the size I f the drains on the winda... Dec 31 2023, 02:08 PM technicalninja One thing I noticed in a Raby video where he demon... Dec 31 2023, 03:42 PM Jack Standz Wow, good catch. I've seen that video before ... Jan 1 2024, 12:48 AM |
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