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no he means the M series...it came between the O and T series, and was a pretty solid engine as the T series is now, in turbo form could take more boost than the T
 

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Yes it was definately a good engine! It took the strong iron block from the O-series, and mated it to an efficaint pent roof, 4valve head, with twin cams. It was a simple and effective design, that gave an easy 25bhp gain and 10-15ib/ft over the O-series, which in nasp form, could not be effectively tuned for much more than it's rated 115bhp. The M-series was lively and still torquey, and it gave good performance in the R800, but in the early R220Gti's it's 140bhp gave excellent acceleration and a strong midrange, as well as quite a bit more top end over the O-series unit. It was later developed into the T-series, and apart from the Block dimensions, bore/stroke etc, many parts were new. However the T-series despit being a bit smoother, and more refined, was never as powerful (in nasp form), or as strong in terms of components used, as the M-series engine. It was a little bit lighter, but not much, and it revved a little more freely. However there is a good argument for saying that the M-series was the best ever 2.0 4cyl Rover engine produced.

I think the M or T-series engines could have been further developed and been made to meet Euro 3 emissions limits with a little bit of development work. After all look at Mitsubishi's 4G63, Evo engine. It's still based closey on the 4cyl 8valve engine from 70's.
 
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I've just been given an M series with a 1991 820 Si wrapped around it. It has stood unmoved and unloved since september 2003 without once being started.

It started first go with a jumpstart and runs as sweet as a nut - now that can't be bad!
 
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