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It's Friday evening, dark outside, too many flying bitey things in the garage when the lights are on, and for a variety of reasons I have time on my hands and no alcohol to help pass it. So, I've started doing a teensy tiny little bit of planning for what I would like to do with an E30 coupe shell. I made the decision a while ago to stick with a 4-pot engine. Lighter than many 6-pots, and more room to work. And fewer cylinders means fewer expensive parts required. And that's as far as it got. In the interests of moving things along, I've since decided to go with an M10. It's original. It's a nice, simple, strong and reliable engine. (Yeah, I know, I'm missing a trick with the opportunity of some of the later engines but I'll live with it.) Admittedly, this decision was influenced by exchanging some emails with a friend in Denmark, who has a friend in Sweden, who has done some silly things with M10s. (And that's without getting into the whole M12 and other variants discussion.) Most recently, he's been developing some top end parts. Roller rockers maintaining better geometry than stock, but weighing more than 5g less. Each. That's over 40g saved from just the twiddly bits in the top. This guy has been testing the rockers, too. He's set up a kit to test cams, rockers valves and springs. Pre-warm oil (of course) and see how long it takes for them to break. It's no fun doing these things at normal engine speeds especially when that's not where they're likely to be used, so how about winding the whole thing up to 10000rpm, walking away and and leaving it for several hours? Subsequent measurements show no measurable wear. An accidental spin to over 15000rpm didn't break anything, but that wasn't sustained. So, this seems like a good idea. Just need a crank, block rods and similar that can do that, too. And a gearbox. And...
