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Thermal Barrier Coatings

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Flow

Well-Known Member
Joined
Apr 27, 2016
Messages
130
Location
Auckland
Hi folks.


We are running a Limbach L2400 and looking improve top end reliability by reducing valve/seat and cylinder head temperatures.


We are exploring many angles but this has been suggested and the side effects are some what unknown.


Coatings:
Piston Top
Exhaust Port
Valve Heads
Combustion Chamber


The benefits are understood but what are the potential pitfalls:
Raised Exhaust Gas Temps causing more back pressure and potentially causing a fire in the hot air pick ups for the cabin and carb heat??
Cooking our Nikasil bores??
Welding our top ring to the piston??


Do we need to coat down to the top ring?
If we do this is there enough clearance there to prevent contact with bore at max piston rock?
How much should we expect the EGT to go up?
How much should we expect the head temps to go down? (Currently 400F)
Should we coat before or after machining the cylinder lands on the heads flat? ie. Do we want to be conducting heat between the cylinder and the heads?


If any one has experience with this any guidance would be kindly appreciated.
 
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