Do you like to create something different and unique from others? So, people will give plenty of compliments to your strategies. If the fact is yes, then I am certain that you fit in with enneagram type 4. Enneagram type 4 is a kind of personality where your image is much like this- "I am different. I?m nothing like you." During the year 1930 there was clearly one engine which as on hype named as 'Ricardo' sleeve valve engine. Mirrlees that point introduced two Mirrleesengines represented this patent type of the valve engine. Well the first sort had bore of around 5.5 inches and designed a stroke of almost 6.5 inches and produced 20BHP each cylinder at rate of 900 r.p.m. another had 17 inches bore and 21.5 inches stroke, giving 50BHP per cylinder on the rate of 200 r.p.m.