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What is the scale of the Iso lines and how can they be shown as higher than the torque curve?
By scale do you mean 275 whats? - the top of the chart says "BSFC (gr.kW.hr)" that is grams of fuel needed to produce a kilowatt hour of work.
The maximum torque at 3500 rpm is about 158 Nm but the specific fuel consumption is about 270 gr/kw hr. This is how you show that if you only have iso lines at multiples of 25.
Do any of the lines necessarily show 100% throttle?
No.
I am assuming the 250 line is centered around 95% throttle lets say, and the 275 line is the constant fuel consumption Iso with 100% throttle across the top which happens to blend to the same consumption with lesser torque output and a lesser throttle opening of 85% (or something) around it's lower portion.
Kinda like that, the iso lines are not throttle positions. Only in the most general way can you say that the part of an iso line near full output is near full throttle - but otherwise the graph give no information about throttle.
-mort
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