brianhare, on 08 February 2012 - 02:02 PM, said:
Actually...is rebuilding a pile of stuff for me..he is not making roller rockers for this engine...... He is trying to design some....but the limited room is the problem he says,,and a smaller base circle cam would be necessary to do it...or possibly a modification to the valve cover for clearance may be possible,not sure on that though,you`d have to talk to him...a smaller base circle cam would allow roller rockers he thinks........but he`s not there yet,but i believe he is thinking about it,,if enough people were to drop coin on him to show real interest he probably would be more interested,it`s expoensive designing this stuff,,,,a decent quantity order would make him think about it more i bet.. B
Yep back in the mid 2000's I made 50 sets of roller rockers, it takes a smaller base circle cam like B said and the rocker box/head needed some trenching on it. I dropped around 45,000 on development on the project and at that time couldn't give the damn things away, the kit came with a new cam profile stiffer springs to accommodate the heavery rocker arm and a new 1.5 ratio rocker arm instead of the 1.4
oem rocker to work correctly so the roller wouldn't ride off the cam. The cam was totally different to work with the roller rockers so you had to purchase that too and you had to use the tall finned valve covers that I still manufacture. The kit was to much money for 99.9 per cent of the XR guys, only the Flat Track crowd bought them from me so I trashed the project and gave the things away tring to build some interest in them while losing my butt on the project. But now I'm working on a new roller rocker that's in R&D for testing at the moment. The problem is the cost to produce these arms, I don't see me selling to many. Like B said if enough people would put in an order I would finish the testing to make sure there's no problems with them. I have a set in my 742 and 780 motor and pop's runs them in his 12.5.1 CW742R motors that I build... so far there holding up just fine but we need to put more miles on them before they would come back onto the market place. I need more interested consumers besides the National flat trackers to recoupe my investment with this project.. I tried an aluminum set that I made a few years ago to help with the new spring pressures and ease of machining on one of my Haas 5 axis machines and they crapped the bed on me, the rollers wore out the arm at the pinned location..So now I'm back to the cast rockers again... So if you want a set I would custom make you some but they would not be cheap, most people will not drop the coin on them they would rather replace there oem ones with hardwelded rockers and a hardwelded cam, I do manufacture cams and hardwelded rockers which is the cheaper way to go. But lets look at the benny's of a roller rocker. 1. less friction 2. less heat from less friction 3. more power from less friction and heat. 4. never have to replace cam/rockers again 5. save money in the long term if you ride hard and keep your bike for a long periods of time. The newer rocker that I'm testing has a swivel tip that rides on the secondary arm on the valve tip, the swivel takes care of the side loading on the secondary rocker arm. Take a look at your second arm and notice the grooving that the main rocker leaves on it. I haven't totally given up on the aluminum rocker though, I think I can still make them hold up and last, any guinea's out there??
C-dub......
made in the USof A
