> Mark-you indicated 140HP heads have problems with valves? Is it the valve > stems, the valve heads, the valve guides or the valve seats that account for this > fault in the !40HP? Franc Steel
Sorry, I left out the word "seats". The valves are such a large diameter that there is very little real estate left between them. The high temperature delta between intake and exhaust leads to distortion and cracking, resulting in the seats falling out, jamming the valve open. The good news is that it usually happens when you shut the engine off, but it also happens when running. When the engine is running, the valve keeps slamming the seat tight, but after you switch it off, if that valve is open, the seat falls out and gets cocked. f you're serious about building a Corvair engine for an airplane, you definitely need to go ahead and buy William Wynne's Corvair Conversion Manual from http://www.flycorvair.com/ . Mark Langford, Huntsville, Alabama N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford
