New generation Wiseco coating????

[Robbie B]

What is the black/gray coating on the new wiseco's??????
Its inside the piston , inside the wrist pin bores and on the top of the piston, its not on the machined outside of the piston that will contact the bore.
Piston balancing will obviously mean some of this coating will be removed from inside the skirt. Can't see that this will effect the piston in any way.
What do you gurus think????????

:confused: :confused:

Thanks

[Laker]

Awww Robbie....
The dark side is Evil ...
Focus on good... feel the force

[Robbie B]

Force??????????.........Force, who ever heard of racing a Force outboard:D :D :D
Sorry all you Force guys, just kidding!!!

Chris.... its all John M's fault, he cast a DARK spell over me, HP, HP and still more HP...................MMMMMMMMMMM.............. sorry drifted to the other side there for a second!!!!
Seriously do you know any thing about this black stuff, wiseco black stuff that is????
Got my new pistons for the Xflow, block being bored, should be ready at end of week.
Ready to start balancing and or lightening, removed 70 grams from the last set, down to 605gms bare.
Same weight as original CCC pistons.
One hell of a lot of work though!!!!!!!!!! Is it realy worth it??????
It could only be for one seasons running..... oops..... theres that DARK side thing again!!
Hope someone has an insight into the black wiseco stuff???

Cheers

[us1]

I was told it is a ceramic coating to keep the heat out of the piston stopping the locator pins from falling out so fast.

[RichS]

Is the color of the hood on my mota! Well Mariner gray anyway. Last Wiseco i saw looked like it had some die lube from the forging process. I wouldn't think that anything should be on the underside unless you could come up with insulation to keep the charge cool.... Hey maybe that's the ticket:D :D ;)

[Robbie B]

Very dark gray.......... yep that about sums it up.
Applied after some machining though as its inside the finished wrist pin holes?????
It does look like some sort of dry die lube but why would it be applied it after partial machining??????
If it was some sort of anti friction coating why wouldn't it be on the machined surfaces that actually contact the bore?????
Most curious!!!!
Must be a well kept Wiseco secret too as no one seems quite sure of its purpose!!!!
US1 could be on the right track for the top side, but inside??????
Could just be a ploy to stop ammatures like me from fiddling with them, DON'T PLAY WITH THE COATING BOY!! dont think I read that in the instructions, may be in the fine print though, after all we only read the instructions when it dosn't work anyway!!!!!!
More opinions please!!!:) :)

[Markus]

I have also been told that it is a ceramic coating to insulate from heat. Does the same thing on the inside as on the top.

[Sashsqash]

Its not ceramic.If it was it would be white and not in the pin embossments.It is a Hard Anodizing process to add strenght to the soft alluminum.Wiescos have been know to waller out pin embossments.

[us1]

Are you talking about the wrist pin clips or the ring locator pins?

[Instigator]

my new looper pistons have it too.
Wiseco rep told me it was for heat insulation/dissapation, not sure of material.
Robbie, how did you lighten yours??
Did you follow all of the stock contours??
Everything I've read on reciprocating weight says it gives no additional HP's but lets the motor rev quicker.
out of the corners a little quicker for you Robbie.

[us1]

That's what I heard, heat insulation/dissipation, to help keep the ring locator pin in.

[George Fuler]

It's anodizing. They started it on the x-flow pistons. It's to maintain the hardness of the aluminum.The previous pistons would aneale ( loose hardness ) without it. Maybe the pins will stay in now!....George

[RichS]

If it's anodize it's easy to check, just touch it with a voltmeter. If no continuity then it's anodize (or some other non-metalic material), if it shows continuity with just a very light touch of teh 2 probes it's not anodized. Anodize is also hard to control the thickness on. Also, half of the coating goes into the surface and half grows out from the surface. Unless the process is controlled very closely this thickness variation can change the pinhole size .001" or more. The piston material is a very high silicon which can leave silicon at the surface to wear on the pin. But, what do I know? Now, if it was a teflon hardcoat on the OD it might be interesting. Then of course the bore would have to be about the same or harder!!!! Oh well.:confused:

[Robbie B]

Followed the internal contour of a genuine CCC pistion. Cut one into segments on the band saw to see profile.
Lightened them to ease the load on the rods/bolts etc.at the big revs.
Wiesco's are heavy compared to CCC pistons.
Not sure how they compare to std cast Xflow pistons, does any one know the weight of a std 3.530" piston??????
Unfortunately melted the jolly little #@%$&#@%$'s before I could really test there durability. A bad case or racers disease, (no relation to Racer of the board of course) to much spark and not enough fuel!!!!!!!!! Maaan it was really smokin for a few seconds !!!!!!
Not sure if I should attack the new ones with the coating the same way though???????
Whats ya think????????? :confused: :confused:

[Instigator]

Robbie, the guy I talked to at Wiseco said it was fairly common for people to lighten their pistons.
Was thinking of doing this until I got mine.
I don't feel there's enough meat in them to remove to be an advantage in my application w/o paying for it with reduced durability.
I need to get scales to compare all of the dead pistons layin all over by basement floor. (for balancing too)
Rich, I just checked and their is no continuity showing on my meter.
Don't have an earlier Wiseco to compare to but, looks like the locating pin is in pretty solid.
There is a casting boss visible inside the piston that the pin presses into.
I got #3119's which are for a '88 tp '92 pre-finger port and will drill the piston myself.
Al S. said to do this and I don't remember why, weight I think??
(I don't argue with what he says!!)
Comparind to a factory version of the same, they look to be identical.
Pins in same location.
Camparing to a slug out of my 250 (w/fingers), the pin does line up with the finger port in that piston.
Think someone said Wiseco moved these??
Here is a picture bellow of the crown on the new pistopn showing the coating, and will pst another one of the inside.

[Instigator]

Inside of piston, showing coating.
In this one you can see the boss I spoke of earlier for the locating pin, left side.

[Robbie B]

Attached is pic of standard OMC, CCC forged piston - 605 grams
Next two posts, with attachments are wiseco's, lightened and std.

[Robbie B]

Pic of Wiseco Xflow lightened to same internal profile as CCC piston - 605 grams.

[Robbie B]

Pic of std Xflow wiseco with the coating - 691 grams!!!!!

[Robbie B]

Remember when I posted complaining cause my attached pics were to small, well as you can see they are to dammed big now!!!!!
Oh well I guess I will get it right some day!!!!!!!!:rolleyes:

[us1]

Greg increased the file size for the attachments.