Hi,
I am about to install a primary belt drive on a 1970 Triumph TR6C. I have ordered the kit from MAPcycle. Due to the fact that from 70 on Triumph began venting the crankcase through the primary case I have to install an alternative crankcase vent system. Fortunately MAP has included a vent kit along with the belt kit (supposedly has a reed valve). From what I understand the placement of the kit is left up to the installer. If anyone out there has ever installed the MAP vent kit and would care to share their experience I'd be happy to hear from you.

GB

Hi Dave,
I hope you see this. MAP sent their breather kit (MAP2088) along with their primary belt kit. What they give you is about 4 feet of 1/2 diameter clear plastic hose, an inline reed valve (large round body sort of like the Ducati ones), three little rivets with which to plug off the oil passages between the primary case and crankcase, a crankshaft seal (as it is not sealed between the crankcase and primary case), and a fitting to connect the hose to the back of the crankcase. On the 1970 model there is a plug (TDC indicator plug) right into the crankcase just under the carb. The fitting (a hose barb) just crews right into that plug hole and presto new crankcase vent.

I've seen it done on the front motor mount. Wholes drilled through the case into the mount cavity and the cavity drilled and tapped for fitting. Sorry no photos...

willh wrote:I've seen it done on the front motor mount. Wholes drilled through the case into the mount cavity and the cavity drilled and tapped for fitting. Sorry no photos...

Something like this?
The pic is taken from the Dresda website.



Webby

That's possibly the best place to put one, Webby. You can employ a large one-way reed valve there (in-line), and you can implement drain-back provisions from the cavity, at the bottom.

Inside the cavity, something along the lines of nylon mesh was used on my friends bike to aid in oil separation. A Harley one-way flapper was used but didn`t work out so ended up breathing through hose that ended at the license plate

Webby03 wrote:

willh wrote:I've seen it done on the front motor mount. Wholes drilled through the case into the mount cavity and the cavity drilled and tapped for fitting. Sorry no photos...

Something like this?
The pic is taken from the Dresda website.



Webby

Yup,

Only picture I have, you can just barely make it out....clear braided tubing.

That little collection would sure look good in my driveway...

grandpaul wrote:That little collection would sure look good in my driveway...

The one on the right is my favorite...

That is a very nice collection you've got there Will.

Webby

Webby03 wrote:That is a very nice collection you've got there Will.

Webby

I wish... Not mine but one of my friends.

grandpaul wrote:That's possibly the best place to put one, Webby. You can employ a large one-way reed valve there (in-line), and you can implement drain-back provisions from the cavity, at the bottom.

I agree GPZ,
Pretty much all the specialists I've spoken to think that the forward mount is the best place for the breather.
The problem with using the timing plug at the back of the crankcase is that it's right in line with oil spray from the flywheel.
One thing, I don't know is how do you modify the area between the crankcase and the mount? I was thinking that maybe drilling two 3/8" holes would probably be enough. Any suggestions?

Webby

willh wrote:

Webby03 wrote:That is a very nice collection you've got there Will.

Webby

I wish... Not mine but one of my friends.

Your friend is a very lucky bloke!
Have you managed to blag a ride on the Norvin ?

Webby