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Tyrap
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| Joined: | Thu Jun 28th, 2007 |
| Location: | Chandler AZ |
| Posts: | 22 |
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Posted: Sat Jul 14th, 2007 02:09 pm |
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The folks that do these services claim the results are great...
Lot's of racers in the auto world swear by them...
M/C engine builders seem to want to talk them down...
I am thinking that anything that keeps heat out of the cylinder walls and off the small end of the rod has to be a big bonus for a rhino....
I figure on coating the piston crown at a minimum...regardless of how many experts don't think it is needed...
I would still like to know what your opinion is...
BTW,
When I spoke to CP last year...they said coatings were a waste...especially the lubrication coating on the skirts...
Now I see their pistons have that as standard feature...
I am not knocking them for knocking coatings or using them...just saying that unless there is a very good reason not to use them...I intend to...
Also, I know there is/was at least one place in Chandler that can do all three of the coating types....Thermal, Lube, Emissity....
From the pricing that I was given at that time for the piston, valves, combustion chamber, and header....it seemed like a no-brainer to me...
So why isn't this stuff more common........
And have you had anything coated...if so, what, who did it...etc.
Thanks,
TY
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Weller Racing
Member
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Posted: Mon Jul 16th, 2007 05:55 am |
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Honestly I haven't messed with the coating very much. I did coat a piston on a YFZ450 with a thermal coating for nitrous. It was just a pre-caution, but we never had problems with it and we used nitrous all the time. I do know that the Athena pistons use a coating with their big bore kits which must be for a reason. When I worked for Chevy we used coated skirts on the LS1 engines too, tech told me that it was to help quiet the engine down when I asked them..... I would imagine that now a days the coatings are getting alot better and are definitly worth it. As far as thermal and longevity I am sure it would be a good idea..... One area that needs some "testing" from us for sure. 
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Tyrap
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| Joined: | Thu Jun 28th, 2007 |
| Location: | Chandler AZ |
| Posts: | 22 |
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Posted: Sat Aug 25th, 2007 10:16 pm |
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Well,
We are gonna get some testing for sure...
All the top end components are in for coatings and the rod as well...
I am going ALL OUT on the coatings...
Piston gets ceramic tbc on the crown, wettable film on the skirts, non-wettable film on the underside...
Combustion chamber gets ceramic tbc...as do the exhaust ports...
Valve faces and backs get ceraminc tbc...valve stems get wettable film...
Valve springs (duals), bottoms and retainers get wettable film...
Rod gets non-wettable film on the body only...
Headers get 2000* tbc coated inside and out...
Wettable means oil will adhere to the film...the film itself is a dry-lubricant but also 'wicks' oil...
Non-wettable means it sheds oil...oil will not stick to the surface...
For the piston bottom and rod body that means it doesn't get weighted down by oil as the oil the gets splashed/dripped on those surfaces also gets thrown-off as the piston and rod attempt to go up on the compression stroke...as they say...it is supposed to reduce windage drag...but also keep hot oil from sticking to the metal and creating an thermal insulator and thereby allowing cooler (fresh) oil to take it's place...no 'glazing' of the underside of the piston either...
They claim that the wettable coatings on the valve springs keep the sprinds much cooler and that the springs life is not only extended but also that the springs 'performance' remains like new for much longer as well...who really knows..eh
We'll see...All I really care about is getting tons of miles out the motor...so if the coatings keep temps down and aid with longevity...any potential power gains are just a bonus...
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Tyrap
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| Location: | Chandler AZ |
| Posts: | 22 |
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Posted: Sun Sep 9th, 2007 04:57 am |
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