Thread: EGT question...
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beepbeep beepbeep is offline
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Originally Posted by 964 T #304 View Post
At 1200 deg. you are on the edge of sezing a piston. I am not sure on a porsche ,bit the melting point of the alum. is some where arount 1300 deg.
You cannot compare EGT of hot gas to melting point of material. Flame front of exploding gas mixture in the combustion chamber has much higher temperature than melting point of cylinder walls. But cylinder walls will not melt as there is a thin sheet of cooler gas protecting the cylinder walls.

A good rule of thumb is not to exceed 900 deg C , measured at turbine intake. Modern turbochargers with Chromium-Nickel cast exhaust parts can exceed 950 deg. C even in normal operation. But 3DLZ isn't up to this so <900 deg. C should be OK.
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Old 11-06-2009, 06:46 AM
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