Coated pistons diy

biggy238 said:
For you engineer types:

I'm having my own little conversation, but if the coatings work, EGT should be (maybe unnoticeablely) higher due to heat rejection?

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Yup, you're exactly right. Thermal barrier coatings on the piston crown, etc can help mitigate heat absorption into the piston. Obviously the energy goes somewhere else. That somewhere else can be in doing more work on the piston, or in extra exhaust energy. That ratio changes based on a lot of things, but most of the extra energy goes out the exhaust.

In the old days, the fuel energy balance played out roughly as 1/3 toward work, 1/3 heat loss to coolant, etc, and 1/3 out the exhaust. Obviously the work portion has gone up some on more advanced engines, but the balance is still there.

--Eric
 
ENafziger said:
Yup, you're exactly right. Thermal barrier coatings on the piston crown, etc can help mitigate heat absorption into the piston. Obviously the energy goes somewhere else. That somewhere else can be in doing more work on the piston, or in extra exhaust energy. That ratio changes based on a lot of things, but most of the extra energy goes out the exhaust.

In the old days, the fuel energy balance played out roughly as 1/3 toward work, 1/3 heat loss to coolant, etc, and 1/3 out the exhaust. Obviously the work portion has gone up some on more advanced engines, but the balance is still there.

--Eric
Click to expand...
I need to have a discussion with you about your work with exhaust energy recuperation and refrigerant. ?

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