Re: Break In Period

Posted by Rusty O\'Toole On 2009/12/27 10:53:12

The last new sleeve valve engines were the English Bristol aircraft engines of the late 40s. They produced some eye popping horsepower but never reached production as the first jet engines were coming in at the time.

This is the same firm that produces the Bristol sports cars with Chrysler engines.

If someone wanted to make a sleeve valve engine today they could make it with an aluminum block, chrome steel sleeves running on the aluminum, and aluminum pistons inside the sleeves.

It would be interesting to see how it worked. Unfortunately the weight of the sleeves would limit the rpms. But breathing and combustion chamber shape could be optimized over what poppet valves allow.

It might work better as a diesel than a gas engine.