There is a bit of an issue that came up during a how things work chat with Bob a couple of years ago. It seems the support for the exh seat on the short side of the port is a bit of issue, other than it just being noted the wow not much meat there. Having lapped and sent out to bat a fair number of heads, Bob noticed that about 5000-8000km the exh starts to leak a tiny bit around the short side. We concluded it must be due to movement of the seat.
Two schools of thought were concluded. The seat is either bending up to the valve or down away from the valve. I've voted for the up to the valve due to heat expansion rathe than gone soft due to heat.
So the combustion chamber and exh port got the ceramic coating treatment to knock of some of the heat.
I could have gotten pink or blue but thought best to stay with the bikes brake and wheel colour scheme.😁 Nah, some guys twin turbo car pistons were done and he chose the colour.
I guess there'll be some other small gains. Exh gas stays a wee bit hotter for a bit so it will clear a pecosecond faster, wee gain in energy loss through heat conduction. Wee tiny tiny gain in compression due to 0.001-0.002 coating thickness, and might be able to run a tad leaner. Definitely no 10HP mate as far as l see
I feel the turbo boys who spend hours awake at night worrying about thermal melt down it's more appropriate for.
Piston crowns are not really a heat issue with 5 litres of oil, a cooler, and the worlds second biggest oil slinger wizzing around.
I have coating on the 888 piston but not the combustion chamber. Didn't send to warrant it.
Combustion gunge does seem to wipe off better with acetone is a big bonus😁
