Crankcase Breathing |
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Crankcase Breathing |
Bulldog9 |
Sep 19 2015, 02:44 PM
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#1
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Senior Member Group: Members Posts: 705 Joined: 21-August 13 From: United States Member No.: 16,283 Region Association: MidAtlantic Region |
As I round the final corner, I need to wrap up the crankcase breather and fuel tank vent system. The 912E has a fuel filler vent that runs from the tank to a canister up front, then runs a small vacuum line to the rear that plugs into what looks like a charcoal canister. This canister also has a larger inlet and outlet. I am assuming the outlet can go to the breather can, and also lines from breather can to the inside of the air filter on the carbs.
Looking at the left side of the fan housing on the type 4 motor, I see a nipple. I'm 99% sure that this is to go to the inlet side of the vac canister. Based on some of my reading and files,, I've been planning a simple breather can. http://www.hamincgroup.com/type4-test.php I decided to draw out what I am planning, black lines are confirmed, the blue is what I am thinking. Anyone have recommendations or thoughts on this? I've seen breather cans that run from $80 - $300. Thanks Attached thumbnail(s) |
Mark Henry |
Sep 20 2015, 12:35 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
If you want to retain the charcoal canister run a separate hose to the carb. You don't want fuel in your oil.
I'm not sure if it has any affect on the AF ratio, it's only a slight amount of vapour and bulk of it is suppose to to be blown in and burnt at start-up. I'd personally just remove it and block it off for a carb app. |
Bulldog9 |
Sep 20 2015, 10:58 AM
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#3
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Senior Member Group: Members Posts: 705 Joined: 21-August 13 From: United States Member No.: 16,283 Region Association: MidAtlantic Region |
If you want to retain the charcoal canister run a separate hose to the carb. You don't want fuel in your oil. I'm not sure if it has any affect on the AF ratio, it's only a slight amount of vapour and bulk of it is suppose to to be blown in and burnt at start-up. I'd personally just remove it and block it off for a carb app. I'm mostly looking to see where the 'exit' from the charcoal canister goes. I've seen 4-5 different configurations on the type 4 in 914's 912 Rebels, and all over Samba, not sure which way to go. Simplest would be block off the fan outlet, and vent/vacuum line from the fuel tank, and run 1 line from the crankcase vent on the chimney to a breather box, but I'd like to do more than just block off. |
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