Oil tank breather line question
- Thread starter Robb2014
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Robb2014 said:
Only black airbox 850 Mk.1A (possibly?), 2A and Mk3 models had that breather arrangement (the drawing is from the 850 Mk3 manual)
Robb2014 said:
To a pipe on the back plate of the metal airbox.
http://www.oldbritts.com/1973_g12.html
DogT
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I have a different setup (central oil tank) and I routed my oil tank breather to a catch bottle. Much better solution in my opinion. It would be easy for you. I had to make a project out of it because my oil tank breather goes right into the air filter with no hoses, it's integral in the oil tank. I've been thinking about blocking it and adding another breather port in the top of the tank.
Dave
69S
Dave
69S
maylar said:On my '74 it goes to a pipe on the back side of the air filter mounting plate. Overfill the oil tank and your air filter gets saturated with oil
Mmmm nice, especially as fun as it is changing that filter. Does anyone ever just run a dump out the back some place?
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Robb2014 said:maylar said:On my '74 it goes to a pipe on the back side of the air filter mounting plate. Overfill the oil tank and your air filter gets saturated with oil
Mmmm nice, especially as fun as it is changing that filter. Does anyone ever just run a dump out the back some place?
Yes you can do that but it can get messy and basically mists your bike with oil. I opted for a catch bottle.
Here is a thread on catch bottles.
catch-bottles-t14100.html
drones76 said:Robb2014 said:maylar said:On my '74 it goes to a pipe on the back side of the air filter mounting plate. Overfill the oil tank and your air filter gets saturated with oil
Mmmm nice, especially as fun as it is changing that filter. Does anyone ever just run a dump out the back some place?
Yes you can do that but it can get messy and basically mists your bike with oil. I opted for a catch bottle.
Here is a thread on catch bottles.
catch-bottles-t14100.html
Thanks for the info all... catch bottle it is.
DogT
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In 1K miles I have less than 1/4" in my large pill bottle catch can. I bought one of those AL cans like drones, am trying to figure a way to add a new breather to the tank and use it. No matter where you dump the oil, it makes a mess. Better to contain the oil.
I tried dumping it down below the centre stand and it was all over the bottom of the bike back to the rear wheel.
Dave
69S
I tried dumping it down below the centre stand and it was all over the bottom of the bike back to the rear wheel.
Dave
69S
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Robb2014 said:maylar said:On my '74 it goes to a pipe on the back side of the air filter mounting plate. Overfill the oil tank and your air filter gets saturated with oil
Mmmm nice, especially as fun as it is changing that filter. Does anyone ever just run a dump out the back some place?
im now running a line to the rear of the lic plate. works good on the last 200 miles. Not a drip on my tire or mist on the rear area. its working great for me so far.
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iceteanolemon said:
That's how it was done before the first air quality regs. On Triumph they had a silver-colored hose that ran down the left side of the rear fender. My P11 has the hose run around the inside of the fender from the oil tank to just below the license plate.
I used to work on old cars, and in the days before PCV valves, crank case venting was done via a 'road draft tube', typically a steel tube that ran from the lifter galley down past the transmission, where it was open to the road.
concours
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BillT said:iceteanolemon said:
That's how it was done before the first air quality regs. On Triumph they had a silver-colored hose that ran down the left side of the rear fender. My P11 has the hose run around the inside of the fender from the oil tank to just below the license plate.
I used to work on old cars, and in the days before PCV valves, crank case venting was done via a 'road draft tube', typically a steel tube that ran from the lifter galley down past the transmission, where it was open to the road.
The crankcase venting of the Paralell twin is more challenging than a 4-6-8.. two rising and falling together, versus some headed up, while others headed down. Add to that a very small crankcase (dry sump) and there's more than just blow-by gases, it's a suck-blow storm.
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well with all this being said I think I may "upgrade" and add a small air filter to the hose.... Other than that its a done deal for me!!
DogT said:
Hi Dave
Methinks you may have hit upon the ideal solution for us central- oil- tankers. And the timing is perfect for me: my oil tank is on the work bench right now. I'll see if I can add that extra breather port as a back-up plan, in case the timing case breather I am working on puts out too much oil to be routed directly to the catch tank. If I have to route it back to the oil tank, that extra port will be needed.
I'm guessing that your intention is to route the breather to the air filter via the catch bottle, since you already have the hole in the air filter plate?
Cheers
Martin
DogT
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I was just going to take the new oil tank breather port and take it to the catch bottle and let it breathe to the air. No intention of routing anything into the air filter/carb intakes.MFB said:
I have an extra oil tank I was thinking about operating on at some point. There's a slight difference as to where the timed breather tube goes on each one, I'm thinking my original one is older, that breather tube goes to the top hat thingie.
Dave
69S
DogT said:
That's interesting. Norton must have fiddled with the details on this tank for some reason. My tank must be like your extra one. The pipe for the timed breather comes out the top of the tank next to the top hat then bends 90 degrees to face left/rear about 45 degrees. I haven't decided where to place the extra port yet - maybe in the top hat if space permits?
Cheers
Martin
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