Re: Break In Period

Posted by Rusty O\'Toole On 2009/12/27 16:49:13

Voisin also found out you could run a much higher compression ratio in a sleeve valve engine because you could make the combustion chamber the perfect shape, and perfectly smooth.

He made his sleeves as thin and light as possible too.

One of the results of making the ports bigger, was that he reduced low speed power, like a ported 2 stroke. His engines would run up to 4500 RPM very high for a sleeve valve in fact, higher than most engines of the 30s. But low speed power was poor.