2Ts are hateful things but do in the end respond to some sort of logic.
The ceramic coated piston was a disaster,but change the coating so that only the dome is insulated,and the squish area is left stock - then the deto instantly goes away.
One has to assume that the heat that isnt absorbed by the piston has to go either into the combustion gas, or a % of it is transferred into the water via the insert.
When I tested this the egt did rise,about 1/2 a jet size,so not really significant,but if you coat the combustion chamber ( not the squish area ) the temp rises another
whole jet size and the pipe then reved on a worthwhile amount.
As it turns out, i prefer now to mirror polish the piston ( much cheaper than ceramic ) and that works even better.
But you have to keep on cleaning it as oil burns onto the surface.
The coating in the chamber is a real "hidden trick " and doesnt cost much at all.
It increases the combustion gas heat retention and the water temp drops, a win win.
Have a think about the process and what is needed by different parts of the enclosed combustion space.
We want to keep heat out of the piston and in the gas - so polish the piston so it reflects the heat back.
We want to keep heat out of the water - coat the chamber.
We want to effectively cool the plug body - get water right up to the threads.
We want to keep the squish area boundary layer and thus the trapped end gases cool - you work it out, I have but aint telling.
Re the TM Ex duct - I have the cylinder CAD file so I remodeled the duct,reducing the height and added the ears all the way down the side right thru the spigot to the header.
The exit area is smaller again than the C model, and as per usual it made best power in the sim at 75% of the effective total Ex port area.
Franco has the file,and has promised to make the special sand cores for a cylinder in the next manufacturing batch - " just to make me happy ".
As Jan said,I think he will be surprised, but for me it enables a bigger scope of new pipe design critera with alot more front side power and overev capability.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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