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Originally Posted by raddy
I think that you are right, if you tuning by lambda, you can forget to AFR and fuel types, thats known thing... anyway, tuning by lambda is only REALLY correct....
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That was really my area of uncertainty. Whether an indication of 0.85λ really does mean 0.85λ for the combined blend of fuels overall, regardless of what percentage of the fuel entering the engine is gasoline vs. methanol.
So, the question is:
When burning a more-or-less homogeneous mixture of gasoline and methanol, at a combined 0.85 lambda, will the gasoline behave in the same way as it would were it running all by itself at 0.85 lambda?
In other words, gasoline at 1λ (or even leaner) would be expected to produce high EGTs, detonate, etc., when run through an engine that's operating at 180 kPa. By contrast, gasoline running at 0.85λ, under the same conditions, tends to behave itself provided the ignition timing is not too aggressive.
Will it continue to do so in an overall 0.85λ environment, even if the amount of gasoline present is less than would constitute a 0.85λ mixture were it not for the presence of some other fuel as well?