Triumph crankcase vent

geo46er

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Dec 19, 2004
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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
 
geo46er said:
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
Click to expand...

No but I'd love to see the instructions when you get them.
 
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 said:
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...
Click to expand...

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

Triumph crankcase vent


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 said:
willh said:
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...
Click to expand...

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

Triumph crankcase vent


Webby
Click to expand...
Yup,
Triumph crankcase vent

Only picture I have, you can just barely make it out....clear braided tubing.
 
grandpaul said:
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.
Click to expand...

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
 
Webby03 said:
Your friend is a very lucky bloke! :)
Have you managed to blag a ride on the Norvin ?

Webby
Click to expand...
Last time I saw him he had just put some new Amals on it and it was running horribly, he said that he was going to go back to the old ones.

SQ hiding in an unusual spot caught me making a pass above the marked limit :evil: Nice enough cop let me keep the bike and my license and marked the ticket down to a very reasonable amount. Unfortunately I have to pay tickets out of my fun money which means no fun for a month or two or I would be planning a ride with my friend in the coming weeks and trying to bum a ride on the Norvin.
 
That sucks Will , how fast were you going? :(
But such is life ! I've just got my insurance renewal though for my 71 Bonnie and it's gone up by about 100 euros (or 30%)! So there goes the Triton play money for another month !
One thing for sure, these old tarts keep you in the poor house :roll:

Webby
 
Webby03 said:
That sucks Will , how fast were you going? :(
But such is life ! I've just got my insurance renewal though for my 71 Bonnie and it's gone up by about 100 euros (or 30%)! So there goes the Triton play money for another month !
One thing for sure, these old tarts keep you in the poor house :roll:

Webby
Click to expand...
50 kph over the limit, 625$, bike seizure, suspended license for a week, 5 demerit points, and bike towed, but he he let me off with 252$ fine, 3 demerit points and a stern warning because of my "experience" and the fact that I didn't do a runner, ( I could of but ...).

It hurts because next years registration and insurance will go up.

My fault for not being able to follow a Hyundai below the limit and liking to make my pass quickly :twisted:

I should sell some stuff on ebay to pay the ticket but I hate going into the parts stash... but summer is so short.
 
Thats harsh !
Over here is not that bad, you just have to pay the fine :) Belgium must be one of the few countries in Europe that have not adopted the points system for your license.
 
willh said:
50 kph over the limit, 625$, bike seizure, suspended license for a week, 5 demerit points, and bike towed, but he he let me off with 252$ fine, 3 demerit points and a stern warning because of my "experience" and the fact that I didn't do a runner, ( I could of but ...).
Click to expand...

30 mph over the limit? Was it like 55 in a 25 or 100 in a 70? And they nabbed you on a pass?

Oregon state law says you cannot exceed the speed limit while passing. :roll:
 
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