Can the inner and outer sealing discs for the chaincase just be left out when using belt drive or is it advisable to install them to stop road grime getting into the case from outside. I found mine had parted and the outer one was chewed up by the sprocket and chain with the remains rattling around at the back of the case.
chaincase sealing discs
- Thread starter edward
- Start date
- Status
I installed a Maney outrigger this winter and of course this eliminates these dics and felt. There is maybe an 1/8" gap fore and aft but it is what it is. I have thought of applying a rubber seal somehow on the inner to help keep it clean.
I do not know how much road crap will get in there or how much maintainance it will require but we'll see.
That being said, the disks and felt are very easy to replace and I liked having them in place even though they weren't totally needed.
I do not know how much road crap will get in there or how much maintainance it will require but we'll see.
That being said, the disks and felt are very easy to replace and I liked having them in place even though they weren't totally needed.
Hi Ed,
When I installed my primary belt kit some years ago now I removed the tin plates for ventilation, it has not been a problem. However I should also say that I have an "O"ring chain that I do not have to lube as heavily or as often and that I do not ride the bike in crappy weather and I am careful when I wash it. I have also drilled a small (3/16) hole in the lowest spot of the outer primary cover for drainage purposes just in case.
GB
When I installed my primary belt kit some years ago now I removed the tin plates for ventilation, it has not been a problem. However I should also say that I have an "O"ring chain that I do not have to lube as heavily or as often and that I do not ride the bike in crappy weather and I am careful when I wash it. I have also drilled a small (3/16) hole in the lowest spot of the outer primary cover for drainage purposes just in case.
GB
That's a good idea. There are so many who feel the heat is not an issue and it may be common to some units and not others, but I know for the RGM unit, I need some vents.geo46er said:
That's another good idea. No matter how perfect things might be, I always seem to have a drip or two to wipe up on the outer cover under to rotor when I remove the it.geo46er said:
I'm trying to come up with a good method of getting some air thru the primary while keeping grime out. I have read about open belt drive primaries or partly open primaries suffering damage from just a pebble running thru between belt and pulley, especially when warm with most slack taken up by expansion.
I test ran the Newby belt drive on the 650ss with no cover and even fully open was amazed at the amount of expansion due to heating, can't imagine it would do well closed right up.
So at the moment I'm thinking about an arrangement similar to cooling vents used on large 2 and 4 ls brake hubs, a scoop of some sort, mesh and gauze? Possibly one at front and one at rear.
Glen
I test ran the Newby belt drive on the 650ss with no cover and even fully open was amazed at the amount of expansion due to heating, can't imagine it would do well closed right up.
So at the moment I'm thinking about an arrangement similar to cooling vents used on large 2 and 4 ls brake hubs, a scoop of some sort, mesh and gauze? Possibly one at front and one at rear.
Glen
- Joined
- Oct 19, 2005
- Messages
- 18,978
The components inside primary do not require air cooling at all, according to every belt maker, vender and well known builder, so even if just decorative non functional vents to relieve you mind its good enough, if also keeps grit out, which definitely shortens belt edge life. BY far most the heat is coming through the crank shaft pulley and primary case attached to engine. I've checked the heat flow in stages. Spray light oil over primary case then ride behind a truck on dusty road to see where the road grime and chain throw hits or misses to guide vent placement or do like me with a forced air inlet and and out let with some filter material over the intake grill, just for something to do but leaving the nice primary cover intact.
Hobot, one of my first questions to Bob Newby was on the need for ventilation of the primary with belt drive. He did not give me a direct answer but suggested some ventilation methods , one of which was to leave the engine pulley outside face and clutch pressure plate exposed thru cutouts in the cover, as done with many vintage racers.hobot said:
This might be OK for a race bike, but for a roadbike that will see road grit and grime, rocks thrown up from passing vehicles etc, probably not a good plan.
Yes, the heat comes from the engine, but if it is sealed in by an non-vented primary case then temps will be much higher than with ventilation.
Glen
- Joined
- Oct 19, 2005
- Messages
- 18,978
Glen I've had a belt come unglued from the edges d/t grit rubbing edges raw on the front pulley till belt just unraveled. I talked to Kenny Dreer, Steven Maney, Fred-Old Brits, Mic Hemmings and some others, which to a man said absolutely No Need to Vent for cooling, even racing. It bothers me too to feel the heat developed in primary but had to face facts it was just a newbie's feelings and not an actual issue to belt or alternator. Art Deco steam punk flavor opportunity is the real fact of the matter...
So do as I say - Not as I do... note placement to sort of avoid road slash and air pumping via pulley/clutch rotation.
As proof of my also going against facts of the matter, Ms Peel has two belts, so note the added scope in front of impeller housing, which now has blue fiber filter stuffed in. Air at back of vent goes into blower belt case then enters primary belt case then will vent out space around the main shaft- out rigger hole at back side of inner case.
So do as I say - Not as I do... note placement to sort of avoid road slash and air pumping via pulley/clutch rotation.
As proof of my also going against facts of the matter, Ms Peel has two belts, so note the added scope in front of impeller housing, which now has blue fiber filter stuffed in. Air at back of vent goes into blower belt case then enters primary belt case then will vent out space around the main shaft- out rigger hole at back side of inner case.
Steve'o, Although it may be generally deduced by the seasoned member as to the clarity of your intention, seemingly to test the limits of man and machine, to those less inform your exploits may seem a bit abusive.
Rock on brother.
I believe this show my position and too much can be read into it.
A so called friend said it looked like a big butt hole.
Rock on brother.
I believe this show my position and too much can be read into it.
A so called friend said it looked like a big butt hole.
The front of the raised area where the hole are slots (just visible) to collect air. I am not one to frequent dirt road or inclemant weather, not that i am a fair weather rider for there just isn't enough of that arouind here to warrent that label.worntorn said:
I will, however, put some sort of screen at the collection slots and maybe behind the face if it looks good.
- Joined
- Jan 12, 2011
- Messages
- 1,723
I run a belt primary for the past 17 years
I keep the stock primary cover on with no ventilation
live in the desert SW United States and routinely ride with temps well over 100 degrees
I have never, ever had any issue with my belt
personally, I believe ventilating a Commando primary with a belt primary is a waste of time and money, a solution without first any problem
old wive's tale, voodoo, no neccesito
I keep the stock primary cover on with no ventilation
live in the desert SW United States and routinely ride with temps well over 100 degrees
I have never, ever had any issue with my belt
personally, I believe ventilating a Commando primary with a belt primary is a waste of time and money, a solution without first any problem
old wive's tale, voodoo, no neccesito
- Joined
- Oct 19, 2005
- Messages
- 18,978
Aw man the primary belt etc does not need venting but as we people can feel the heat and in general less heat is better for electrical conduction and rubber composite endurance its very hard to resist venting. I love it, its so expressive, I couldn't resist. Peel is soo boring secure on pavement and traffic hazards abound I don't think Drouin needed for the off road antics and parking lots stunts so have not cut into Maney's inner case and have intact factory cover, [though may get the composite kind] to seal air-grit-mud-water tight, in what may be Peel's final long term no Drouin set up. The TTI gearbox is said to eliminate the need of extra out rigger support and a belt drive never needs tension changing once set right, so can put a proper seal on main shaft case entry. I may need a pin hole to keep gas pressure case swelling relaxed.
I ran the front gill holes open for a time but tire throws lots of grit that high and saw gritty dust inside and evidence of belt edges fraying and pulleys sides lost anodization completely so glued a compressed fiber filter behind grill in attempt to seal it, w/o worry on the heat factor. Belt + dust also wore the black anodization completely off the clutch basket teeth and most the valleys, but in a rather sharp defined path that showed it was tracking squarely. My conditions give accelerated wear so may not be a factor for anyone else rain or shine. C'do's are so fun to take the factory Norton out of em your own way.
I ran the front gill holes open for a time but tire throws lots of grit that high and saw gritty dust inside and evidence of belt edges fraying and pulleys sides lost anodization completely so glued a compressed fiber filter behind grill in attempt to seal it, w/o worry on the heat factor. Belt + dust also wore the black anodization completely off the clutch basket teeth and most the valleys, but in a rather sharp defined path that showed it was tracking squarely. My conditions give accelerated wear so may not be a factor for anyone else rain or shine. C'do's are so fun to take the factory Norton out of em your own way.
- Status