Pistons

Fast Eddie said:

trident sam said:

Fast Eddie said:

Ref coating of pistons, I've used these chaps before to Teflon coat skirts and thermal barrier coat crowns, with great success. They now do a process called 'DiamonDyze' which looks similar to the process used by Jim. They are UK based, check out: http://www.camcoat.com/

I think I'll try the DiamonDyze coating on my JS pistons.

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Nigel,
I've used camcoat for exhausts and been happy, but never for piston coating. What's the script, do you get the pistons coated and then bore the cylinder barrel to suit the size or is the coating so thin as to make no difference to the piston/bore size ?
Ta
sam

Looks like your bike will be a cracker when you've done, I'll look forward to showing you a set of raygun tail pipes when it's up and running :twisted:

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They do different coatings Sam. The friction coating I've used on skirts in the past is so thin as to have no effect on tolerances, it is actually used by a lot of OEM automotive manufacturers. The Thermal barrier coating is thicker, but only applied to the crown, so is not relevant to tolerances. When I raced Triumph twins with Degans, we used to modify the heads and pistons heavily to get a good squish band and decent CR. Trouble is, only sock cast pistons were available then and under racing conditions they used to seize. Thermal barrier coating solved this completely and even allowed a hike in CR, I think I ended up at 11.25:1 using stock T140 pistons.

However, they also do a product that they claim can build up a piston skirt by up to 100 microns if it is sloppy in an otherwise good bore!

I'm going to try out the DiamonDyze anodizing I think, and this does not effect tolerances.

Thanks for the offer of showing me a set of Raygun tailpipes... I've never seen any before... its difficult to see them when looking over my shoulder... :mrgreen:

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Ok, ta for info mate.
I'm picking up a 988 barrel and Omega pistons from Neil soon, do you think it's a good idea to have the pistons coated, I'm more interested in longevity than any more performance ? ( there's enough of that allready) if so which coating would you go for ? ta
sam

Ok, ta for info mate.
I'm picking up a 988 barrel and Omega pistons from Neil soon, do you think it's a good idea to have the pistons coated, I'm more interested in longevity than any more performance ? ( there's enough of that allready) if so which coating would you go for ? ta
sam[/quote]

Oh my... You're getting serious aren't you... scared by the things I'm doing to the 'Trident Hunter'...?

They'll be the 71.5mm Omegas, I had them in both my 850 T160 and the Harrier which was 988. When Neil did these for me, timing (of Neils work) was always such an issue that on both builds I didn't coat the pistons. And they both worked fine. BTW, my Harrier was a bloody quick bike (I know it had more radical cams and carbs etc) but I often thought how crazy it would be in a stock chassis...!

If I were building one now, I'd do as I am on the Norton and try the DiamonDyze coating as that does make the most claims to aid longevity.

Camcoat need a minimum of 4 pistons to do the DiamonDyze coating Sam, so let me know if you're interested, we could send our 5 pistons in together. It costs £25+ VAT per piston. Cheap 'insurance' on an expensive engine build IMHO.

Fast Eddie said:

Ok, ta for info mate.
I'm picking up a 988 barrel and Omega pistons from Neil soon, do you think it's a good idea to have the pistons coated, I'm more interested in longevity than any more performance ? ( there's enough of that allready) if so which coating would you go for ? ta
sam

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Oh my... You're getting serious aren't you... scared by the things I'm doing to the 'Trident Hunter'...?

They'll be the 71.5mm Omegas, I had them in both my 850 T160 and the Harrier which was 988. When Neil did these for me, timing (of Neils work) was always such an issue that on both builds I didn't coat the pistons. And they both worked fine. BTW, my Harrier was a bloody quick bike (I know it had more radical cams and carbs etc) but I often thought how crazy it would be in a stock chassis...!

If I were building one now, I'd do as I am on the Norton and try the DiamonDyze coating as that does make the most claims to aid longevity.

Camcoat need a minimum of 4 pistons to do the DiamonDyze coating Sam, so let me know if you're interested, we could send our 5 pistons in together. It costs £25+ VAT per piston. Cheap 'insurance' on an expensive engine build IMHO.[/quote]

Yep, will contact you, Neil has just phoned me :shock: to say the stuff will/should be ready next week.
speak soon
sam

trident sam said:

Fast Eddie said:

Ok, ta for info mate.
I'm picking up a 988 barrel and Omega pistons from Neil soon, do you think it's a good idea to have the pistons coated, I'm more interested in longevity than any more performance ? ( there's enough of that allready) if so which coating would you go for ? ta
sam

Click to expand...

Oh my... You're getting serious aren't you... scared by the things I'm doing to the 'Trident Hunter'...?

They'll be the 71.5mm Omegas, I had them in both my 850 T160 and the Harrier which was 988. When Neil did these for me, timing (of Neils work) was always such an issue that on both builds I didn't coat the pistons. And they both worked fine. BTW, my Harrier was a bloody quick bike (I know it had more radical cams and carbs etc) but I often thought how crazy it would be in a stock chassis...!

If I were building one now, I'd do as I am on the Norton and try the DiamonDyze coating as that does make the most claims to aid longevity.

Camcoat need a minimum of 4 pistons to do the DiamonDyze coating Sam, so let me know if you're interested, we could send our 5 pistons in together. It costs £25+ VAT per piston. Cheap 'insurance' on an expensive engine build IMHO.

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Yep, will contact you, Neil has just phoned me :shock: to say the stuff will/should be ready next week.
speak soon
sam[/quote]

Srewth, Neil's made a New Years Resolution it seems :wink:

BTW, my pistons were forged, not cast. If yours are cast, it just increases the argument for 'extra insurance' IMHO.

ludwig said:

comnoz said:

.. I expect another 100.000 miles from them...

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Where do you find the time to ride all those miles ? ..

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I usually get in around 8 ,000 miles a year. Most of it in a couple big trips each year.

When I used to commute with the bike I did more than that but anymore I hate to ride in the city. Too much traffic and half on cell phones. Jim

ludwig said:

comnoz said:

.. I expect another 100.000 miles from them...

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Where do you find the time to ride all those miles ? ..

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You just have to drive really fast.

I'm living in the wrong country. You guys seem to actually seem to have decent competitions up and going.