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There's no way it can ever ruin an engine. Possibly your clutch since you'll have to rev it up higher to get moving, but it would take a while. It will ruin your brakes, though.
Just a basic rule of thumb.....If it's not supposed to be run like that or used in that manner, then more than likely it'll mess something up! ....motor? unlikely....brakes as mentioned above, yes! lol