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Falcon67
New User
| Posts: 44
| Joined: 04/07
Posted: 10/19/07 06:48 AM
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OK, let me see if I got this right - you guys spent (or somebody) $7500 on an engine, but made no provision or thought for venting the crankcase. Your initial solution was some old school idea to let it drift out of the valve covers. Now you get oil on the headers, gee wonder why. Then you spend $350 something bucks to band-aid the problem - not solve it, just band-aid it - and call it good? Ah...OK
You skipped right over the common pan evac systems. "Getting popular?" What rock have you been under. You also didn't consider any of the known internet hacks involving GM type electric vacuum pumps. And to spend $7500 on an engine and then cheap out because you didn't want to go another $400 or so to help ring seal, produce even a bit more power and keep things clean is just short sighted.
Race Vacuum Pumps Some vacuum pump tech
Personal applications: PCV - have run it on many street/strip engines with zero problems of detonation or oil use. The Mustang has a very simple PCV setup. I used tall valve covers and baffles, using a simple PCV valve with a 90 degree top and some 3/8 fuel hose. Works fine. For sure, it does nothing at full throttle on the strip, but the tall covers and proper baffling leave zero residue on the covers and no drips. The car has thousands of laps with this setup.
The Falcon uses a header evac system - cost me all of about $60 to implement. The car uses 10" of 3" pipe and a set of Dynomax bullets. The evac still works, so mufflers don't break it like you might think.
1967 Falcon 4 door - 351C 1970 Mustang coupe - 351C http://raceabilene.com/kelly/hotrod Owner built, owner abused.
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Posted: 11/29/07 10:33 PM
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Our story was not on the topic of evac systems. Our solution was a breather system. We did touch on evac systems, but it was outside the scope of our story. Having said that, the breather system we designed and built has performed very effectively over the past 5 months.
In publishing our breather system story, we hope to make people aware of the problems that can arise if crankcase ventilation is not dealt with in some fashion. Obviously, there are several ways to do this, and we chose one route for this.
Nice to hear that you obtained a fix for your 4-door Falcon for only $60. Maybe you could flesh out some details for people here so they don't have to second guess how you did it?
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Falcon67
New User
| Posts: 44
| Joined: 04/07
Posted: 11/30/07 07:56 AM
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No problem, should have included the link in the original post. Summit Crankcase Evacuation System
A good tip would be to NOT use the typical (Moroso usually) installation instructions. They are fine up to the diagram where they show how to weld the tube in the collector. The tube should be installed at a 45 degree angle in the collector and oriented so that the open end is facing down stream with the exhaust. About 3" from the tube merge is a good spot, more of less. I'll post a pic of my collectors in a day or so since the headers are out laying on the floor anyway.
I person can probably make one of these kits rather easy - the check valves look just like a Ford air injection check valve. I saw some in the "Help" parts section at O'Reillys the other day. And the tube is just a piece of 1/2" steel pipe. I use regular 5/8" heater hose to connect the check valves to the breathers. the hose gets hot, but hasn't had a problem yet. A high temp silicone hose would probably provide a better long term connection.
1967 Falcon 4 door - 351C 1970 Mustang coupe - 351C http://raceabilene.com/kelly/hotrod Owner built, owner abused.
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Bloose
New User
| Posts: 3
| Joined: 05/07
Posted: 02/16/08 08:21 PM
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I have considered a setup like you used in this article but there is something I cannot figure out. In the setup you outlined you run vacuum from the manifold to the remote breather canister and then a line from the canister to the valve cover. The problem I can't get past is that the canister you used is vented directly to atmosphere through the filter in the top. So, how does this setup pull vacuum in the crankcase? I would have thought you would have a sealed canister that acted as an oil separator/catch can.
I have been reluctant to use a standard PCV setup because I am too worried about pulling oil into the intake. An Evac system would be fine if it would work on a street car. I think your idea is a good one but I'm thinking the system from the vacuum source to the valve cover (PCV valve, elbow, breather with hose connection, etc) should be sealed and not vented to air or you would not create vacuum in the crank case.
Is there something I'm missing?
B-loose
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Bloose
New User
| Posts: 3
| Joined: 05/07
Posted: 03/16/08 04:56 PM
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I went back and looked at the article and it appears that you actually ran from the intake to the VC directly but put a T in the line to the canister. I still cannot understand how this system pulls any vacuum in the crankcase.
If there is any chance you could reply to this I'd really appriciate it because as I said, currently I have only breathers on both valve covers so I believe I am leaving HP on the table with my setup. But, in the long run keeping oil out of the intake seems to be more important.
B-loose
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Posted: 03/18/08 11:26 AM
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The point was never to "pull" atmosphere from the crankcase, only to vent it. If you don't vent it properly, it will find a way to vent on its own--usually by blowing something out, such as the valve cover gasket, the dipstick, the PCV valve, or the rear manifold valley gasket.
A true evac system (not a breather) uses vacuum to draw out the crankcase fumes, and has the added benefit of a horsepower increase. The story on our breather system was never meant to be this type.
This is the kind of misinformation that propagates when folks refuse to read the article before commenting publicly on it.
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