Anyone want some pistons treated?

Gents,

I shall soon be sending off two JMS 850 Commando pistons to be 'Diamondyze' hard anodised. However, the minimum batch size for this process is 4.

If anyone (in the UK) is interested in having a pair of pistons Diamndyze treated then please let me know ASAP.

There is some info on the process here: http://diamondyze.co.uk/test-results/

Fast Eddie said:

Gents,

I shall soon be sending off two JMS 850 Commando pistons to be 'Diamondyze' hard anodised. However, the minimum batch size for this process is 4.

If anyone (in the UK) is interested in having a pair of pistons Diamndyze treated then please let me know ASAP.

There is some info on the process here: http://diamondyze.co.uk/test-results/

Click to expand...

Now if I knew where they were in that 40 foot container......

Might see them again by May....

Site mentions "20 more HP", but doesn't indicate the base HP rating?

If it was a 50HP engine, you've REALLY got something there!

The Diamondyze process was developed by Tech Line Coatings here in California. If anyone is looking for a coater who uses the process in the US, you can call or email them to find the nearest one. Contact info on their web site here

http://www.techlinecoatings.com/hi-perf ... ndyze.html

I've sent them an email asking if there is anyone who does the process in Southern California.

It's an interesting process, and it's pretty simple for any anodizing shop to use. It's just an additive that is used in place the normal color dye when hard anodizing. I worry a little about the fact that you have to grit blast the surface before anodizing, and that's generally considered a bad thing for the ring groove surface. They claim really good results in terms of ring groove wear with the process, so maybe that's really not an issue here. They do show quite a bit of good tests results.

Anyhow, lots more info on their web site.

Ken

I have used a similar coating on the Venolia pistons I have used. They call it Hardtuff coating. It works pretty well. Jim

It's interesting how many different hard anodize processes are available for piston surfaces. JE pistons offers various thicknesses of hard anodize for ring grooves, pin bores, skirts, and even all piston surfaces. The difference between their options is how thick the anodize layer is, from .00025" to .001". In all cases, they say that additional clearance must be added during the manufacture of the piston to accommodate the buildup. If you're just doing the skirts with a thin layer like .00025", then you probably don't have to worry much about it. But if you're doing the ring grooves or pin bores, I'm curious how you manage to do something like the DiamonDyze process without tightening up the fit of the rings in their grooves. Maybe they do a REALLY THIN anodize process?

I've thought of having my JE pistons done with some of their coating options, particularly the Tuff Skirt coating, but that, like all their other options, would add to the cost, and I'm not sure I could sell enough of them to make it worth it. Interesting stuff, though.

You can check out the JE coating options here. I thought the description of the KoolKote process for nitro burning dragsters was pretty cool (pun intended). Maybe more than needed for our Nortons, though.

There's an interesting thread on the subject of hard anodizing pistons here on Speedtalk

http://speedtalk.com/forum/viewtopic.php?f=1&t=23593

Ken

If the aluminium has a high copper content, it should not be anodised.

Make sure that you instruct them to mask off the ring lands. Otherwise they may coat the ring lands along with everything else and then your rings won't fit. They did this to me once and it created a big problem for me to repair. If you want the ring lands coated then you must dimension the ring lands accordingly so you end up with the correct clearance.

Interesting warnings about dimensional issues. DiamonDyze disagree ...

http://diamondyze.co.uk/technical-info/

Each company uses a different process and a different coating = a different thickness. I'm just telling what happened to me. Ask them point blank if the rings are still going to fit.

I'll do just that Jim!

Just noticed that I left out the link for JE piston tech info on piston coating in my earlier post. This is it

http://www.jepistons.com/TechCorner/PistonCoatings.aspx

Lots of good info here.

Ken

Here are some pics of the finished piston treatment. It looks nice to me, but, of course 'the proof of the pudding is in the eating'...

So - do the rings still fit?

I hope this works out well.

jseng1 said:

So - do the rings still fit?

I hope this works out well.

Click to expand...

Yes they Do !

Fast Eddie said:

jseng1 said:

So - do the rings still fit?

I hope this works out well.

Click to expand...

Yes they Do !

Click to expand...

A big benefit is that the ring lands will last longer and not loosen up. This was a problem with Hepolite pistons when I was racing. Because of the high RPMs & piston speeds I was running with a long stroke - They would not make it through a season without the ring lands loosening up and the top rings breaking as a result. Tight ring lands reduce blow by.