The MIT data was taken at lambda=1.0 . There would be complete burn here due to burn rate (heat release). At a more fuel rich mixture, it is possible to get residual burning at exhaust valve opening. Just a technical point, but that is probably not affecting the OP's situation. Additionally, the port shape, combustion chamber and compression ratio affects the burn rate. A swirl imparted to the cylinder charge would increase burn rate/heat release rate. Tumble with a 4 valve configuration would also have an effect. Swirl would reduce best torque timing advance, but also increase heat rejection to cylinder, piston and head.
I was told on some Conti turbo charged engines, the peak exhaust temp occurred 12-14 inches from the port. They had to move the temp probe for that engine.
Interesting data here, an investigation would be some fun.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 01-31-2015 at 07:19 PM.
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