<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
         <<  Lancair Builders' Mail List  >>
         <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>

Mark Lally wrote:
"One thing I find surprising in the debate over the standard GA engines
and the auto conversions is that no one has mentioned that the auto
engines are producing roughly twice the HP per cubic inch as that of
the high output GA engines."

Don't forget to remember at what RPM this horsepower is being produced. Anthing over 2500 RPM (or thereabouts)is useless in a propeller driven airplane. Without adding the weight and complexity of a PSRU, that LS1 Corvette engine couldn't get a Lancair IV off the ground.


He also wrote:
"My whole point here is that the autos are built to withstand much
higher stress levels and if they were derated to produce the HP
Per Cubic Inch that GA engines do, They would absolutely have
no problem reaching a 2000 or more TBO at 75% power."

Car engines generally run around 15-20% power under normal driving conditions. Under racing conditions, when they are running closer to 75%, see how long they go before overhaul.

Micah Froese

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.