Has anyone done quantitative measurements on K04s with thermal barriers/coatings?

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07-09-2005, 09:07 PM

Hal_TT::CBP

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Has anyone done quantitative measurements on K04s with thermal barriers/coatings?

I'm wondering just what this is trying to accomplish on the turbine side mostly. Assuming there would be a measurable diff in EGTs and IATs - wondering if both are possibly higher due to coatings, more heat retention.

Anyway, late night intoxicat(ed/ing) thoughts...

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07-09-2005, 09:11 PM

BoneStockS4

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I guess I'll be finding out soon... What should I log?

I won't have a baseline without coatings for comparison, but perhaps I could get some useful data to compare to a similar car.

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07-09-2005, 09:52 PM

Mike2kS4

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I couldn't find any data quantifying it on any type of turbo.

Hence, mine have no coating.

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07-10-2005, 06:24 AM

davenew

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coat them, but do it to reduce engine bay temps

Well, any amount of heat leaving the turbine housing is part of the equation and reduces the amount of work to the shaft. It says right here in my old thermo book: "Often the exit kinetic energy is neglected, and any heat rejection from the turbine is undesirable, and is commonly small."

The heat transferred out of the turbine housing does, in theory, reduce the work of the shaft, but I'll bet it's only around 1 percent.

I think you'd get more performance-wise (faster spoolup) by extrude honing the turbine housing. Then again, if you have that kind of money to spend on such small gains.. can I borrow some?