In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Frame wrote:

Capt. Quirk,

I have heard this a number of times, that max power occurs when the peak pressure is at °5 ATDC.   I believe this idea originally came from an engine text book by EF Obert, excellent book but he is wrong on that one item.  Over the years I have tested many different types of engines, from fast burn concepts to low compression to high output race engines. Each of these engines were equiped with flush mounted cylinder pressure sensors and a optical encoder, with 0.5 degree resolution, mounted on the front of the crank.  Virtually all of these produced the same result; that max torque or max power is achieved when spark is adjusted such that, the location of peak cylinder pressure is at approx 14° ATDC.  There is a small range of peak location over the entire engine speed range. At 1000 RPM it will be at 14° and decrease to about 12° at peak power (6000 RPM).  This concept holds true at part throttle also.     

Bennettdan,

 

I looked at that WEB site and I think that sensor is made by Bosch.  I have seen them used at work, Bosch calls them "Lamdba sensors".  They might be used in production somewhere in Europe which would bring the cost down.  The ones I used were made by NTK and were just for development, thats why they cost $1000.

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