New DLC coated rocker shafts and timing pinions to eliminate wear and friction.

Diamond like coating, Same stuff they put on wrist pins. No more scuffing. Any time you reduce friction you cool down the motor a tad and send a little more HP to the rear wheel. Tested and proven. Coming soon.



DLC coating on timing pinion.

what is DLC and how is it applied?

jimbo said:

what is DLC and how is it applied?

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Google is your friend: https://en.wikipedia.org/wiki/Diamond-like_carbon

Nice Jim.

Does DLC coating add anything to the diameter of the spindle?
Will the rockers need to be honed and polished to fit the DLC coated spindle, or will these go in without interference?

Schwany said:

Does DLC coating add anything to the diameter of the spindle?
Will the rockers need to be honed and polished to fit the DLC coated spindle, or will these go in without interference?

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They are dimensioned to fit with the DLC. The DLC coating adds only .00025”. The ID of the rockers should be cleaned up with a 1/2" brush/ball hone 320 grit (about $23). Just mount the ball hone on a drill and run it about 5 or 10 seconds because you want to remove any burrs or sharp edges. You don't have to mess with the timing pinion gear. I am seeing no wear at all on the coating. Eric Mass helped push this through.

Here's what a used DLC coated rocker spindle looks like.

I have been telling you for ages - THIS is how you do it !

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jseng1 said:

They are dimensioned to fit with the DLC. The DLC coating adds only .00025”. The ID of the rockers should be cleaned up with a 1/2" brush/ball hone 320 grit (about $23). Just mount the ball hone on a drill and run it about 5 or 10 seconds because you want to remove any burrs or sharp edges. You don't have to mess with the timing pinion gear. I am seeing no wear at all on the coating. Eric Mass helped push this through.

Here's what a used DLC coated rocker spindle looks like.

Click to expand...

They look great Jim

Jim,
I have never seen wear damage to the timing pinion , but I have had to replace my rocker shafts because of wear that I can feel with a fingernail. (HI Mileage Bike)
When you say "coming soon"... What is your time line and how much?
Thanks,

Tom

CanukNortonNut said:

... but I have had to replace my rocker shafts because of wear that I can feel with a fingernail.

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Yes, I'm continually shocked at rough rocker spindles and the rockers still being good. At least the spindles are relatively inexpensive.

What I don't understand is that they get lubed with crankshaft pressure and wear nonetheless. Triumph spindles get return pressure (almost none) and don't wear out - why?

marshg246 said:

Yes, I'm continually shocked at rough rocker spindles and the rockers still being good. At least the spindles are relatively inexpensive.

What I don't understand is that they get lubed with crankshaft pressure and wear nonetheless. Triumph spindles get return pressure (almost none) and don't wear out - why?

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Reach out to Jim about Triumph Spindles . The Triumph (and BSA) spindles are a disaster and when you see that browning on them is extreme localized heat discoloration, which is how bad the issue is. Material choice along with the lack of oiling, and the rough bore of the rockers is the culprit. The localized heat is hot enough to degrade the nitriding, which is not very deep. The spindles Jim has are made from tool steel and have a much higher tempering temperature along with the friction reduction benefits of DLC.

In all reality these shafts are probably better than adding a bearing to the rocker pivot as you are not adding the weight of a bearing into the system and you are getting very near if not better than coefficient of friction of the bearing due to this being oscillation not rotation.