Hi,
Very good article. But what I don't understand is what exactly is the "M" series engine. Surely over those 27years the design of the block, head and pistons had changed so much that the original "M" was designed out of it.
I can understand a limited series of the early M engines being all basically similar (like the 18R series all being similar, including the 18RG which had a similar block/desing but with a DOHC head).
I guess I am trying to figure out Toyotas naming/design convention. For example, what is so different from the (say) 1G series engine, being DOHC 6-cyl, to the equivalent M series.
Similarly, other than capacity, there is little difference between the 2T and 18R series of engines.
Or, as I suspect, am I missing something here.
In any event, I did enjoy your article and I learnt something. It's always a good day when you learn something new, and for that I thank you.
seeyuzz
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