One year ago(12000km ago) I've replaced both CCT's - of course front one failed. I don't want to think when CCT will fail, so I'm wondering to make some modification.
I think that front CCT fails more often because it is not "flooded" in oil - like the rear is.
In cars, CCT are always spring and oil pressure tensioned.
It is possible to feed with oil front CCT from main oil gallery, using some adapters and hoses. To maintain proper oil pressure in main gallery, CCT should be feeded through the jet with small orfice - only to provide some oil inside CCT's mechanism. In addition, this small amount of oil may act as a hydryaulic damper inside CCT.
What do you think about this?
CCT one more time
- benny hedges
- Posts: 6110
- Joined: Sun Oct 18, 2009 5:09 pm
- Location: Warrington
Re: CCT one more time
was thinking about that tbh, would be easy enough to fab a pipe to feed into the little bolthole in the top of the cct and would solve the dry rot problem?
i'm sure it must've been done before but never seen anyone post about it, as in if it works or not.
reckon it would be straightforward to tap a 1/8 bsp thread in the top but you'd want a restrictor so it just feeds a bit in...
go on then, you go first lol... ive just put manuals in mine!
i'm sure it must've been done before but never seen anyone post about it, as in if it works or not.
reckon it would be straightforward to tap a 1/8 bsp thread in the top but you'd want a restrictor so it just feeds a bit in...
go on then, you go first lol... ive just put manuals in mine!
You do not have to say anything. But it may harm your defence if you do not mention when posting something which you later rely on in quote. Anything you do say may be ripped to sh*t.
Re: CCT one more time
Funny was thinking also about this the other day, but not in terms of running an oil feed. Still waiting for my manual CCT's to turn up, almost afraid to start the VTR in case Murphy's Law applies and the front one goes - however.......
In watching Tony at the workshop day the other week, he undid the cap on the rear one and a few drops of oil ran out.
So wondering....if I undid the cap on the front one.....could one do a temporary lube by injecting a few CC's of oil this way just to oil the CCT spring? If it's dry it may help?
I kno wit sounds crazy but sometimes crazy things work. Of course not a long term approach by any means, just paranoid about standard CCT's!!!
In watching Tony at the workshop day the other week, he undid the cap on the rear one and a few drops of oil ran out.
So wondering....if I undid the cap on the front one.....could one do a temporary lube by injecting a few CC's of oil this way just to oil the CCT spring? If it's dry it may help?
I kno wit sounds crazy but sometimes crazy things work. Of course not a long term approach by any means, just paranoid about standard CCT's!!!
Re: CCT one more time
Rear ones fail as well. A bit of oil might make the front ones last a bit longer but they'll fail in the end.
Rich.
Re: CCT one more time
With a manual oil feed you'd have to use engine oil, as it would drain past the spring and plunger back into the engine.
The oil drains out of the CCT in a few seconds, a minute at best, so only a constant drip feed would make any difference.
And due to the angle of the CCT and its spring, the oil would only run down the lower side of the spring. An oil mist would be better than a dropper.
Ideally an electronically-controlled jet- like a diesel fuel injector for example?
You could tap off the oil flowing through the chromed pipes leading to and from the oil cooler, and add a tap or control device to make sure that only a very small flow came through.
Tomek, I'd be very careful with adding enough oil that it had a hydraulic effect; it wouldn't take much at all to push the plunger against the chain and over-tension it.
You'd get excessive chain and slipper wear, but worse, you could ruin the plain bearing in the head where the camshafts sit, because the chain would pull them down into the journal more than it's designed to.
So I'd suggest about two drips a minute at 3,000 RPM would do it, no more, though.
And you'd want to measure that flow rate with hot oil.
All in all, isn't it easier to fit manuals?
The oil drains out of the CCT in a few seconds, a minute at best, so only a constant drip feed would make any difference.
And due to the angle of the CCT and its spring, the oil would only run down the lower side of the spring. An oil mist would be better than a dropper.
Ideally an electronically-controlled jet- like a diesel fuel injector for example?
You could tap off the oil flowing through the chromed pipes leading to and from the oil cooler, and add a tap or control device to make sure that only a very small flow came through.
Tomek, I'd be very careful with adding enough oil that it had a hydraulic effect; it wouldn't take much at all to push the plunger against the chain and over-tension it.
You'd get excessive chain and slipper wear, but worse, you could ruin the plain bearing in the head where the camshafts sit, because the chain would pull them down into the journal more than it's designed to.
So I'd suggest about two drips a minute at 3,000 RPM would do it, no more, though.
And you'd want to measure that flow rate with hot oil.
All in all, isn't it easier to fit manuals?
It's not falling off, it's an upgrade opportunity.
Re: CCT one more time
I have been reading ur thread, it seems a good idea but don't you think that tapping am oil feed a little over kill.
Would the manual conversion be better, the reason I say that is you will still have to replace them because of being a consumable.
After changing mine to manual, I did not want use hassle of taking the bike apart to change them.
Would the manual conversion be better, the reason I say that is you will still have to replace them because of being a consumable.
After changing mine to manual, I did not want use hassle of taking the bike apart to change them.