Quote:
Originally posted by Taz's Master
I realise this is taking the thread in a different direction, and I apologize (hopefully the question has been answered).
But, why are egt's so high in a high compression/high boost engine? What is it that raises the temp? Assuming an efficient compressor, and perfect fuel metering, why do the egt's go so high?
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The easiest way to explain this is where is actual compression occurring?
In a high compression engine most of the heat is generated in the combustion chamber.....
In a boosted low compression engine the charge is created outside of the combustion chamber........hopefully run through an intercooler to cool the charge ......and then into the combustion chamber.
Cooler charge ....less chance of detonation.
Also running a completely riched out mixture will not cure this problem.
In a high compression engine running boost I want to run low boost with a nice tight seal in the combustion chamber.........
IMO stock rings are not the best option anymore although I did use them in my last turbo engine. I can count the NA's and Turbos in my hand that dont have some symptoms of blow by. 99% of the 944's,951's out there when driven hard will have some signs. Take a good look at your intake boots.