You must be kidding. The tolerances in a auto engines are nothing compared to a model airplane engine. Cox tolerances were with in 25 MILLIONTHS of an inch. NO auto engine ever had tolerances that close. Thousandths of and inch at best in auto engines. The rings aren't part of the break in in an auto engine????? That is one of the biggest part of auto engine break in. The rings must wear and mate with the cylinder. Rings are made out of cast iron and relatively soft so they will wear in. That's why a new engine will burn oil oil until the rings break in. Chrome rings take forever to break in and wear the cylinder much faster.

Temp in an auto engine is controlled by water temp??? Tell me about Volkswagon and Porche. Remember the Corvair? That goes for airplane engines too. Not a whole lot of water cooled aircraft engines out there.

Auto engines have two compression rings. Have you ever looked into the cylinder of a McCoy 60? Or a Forster 99, or any of several other model airplane engines? They have TWO compression rings.

Fuel in an auto engine is contolled by computer and fuel injection?? I just looked under the hoods of my 58 and 64 Cadillacs trying to find a computer and fuel injection system. I sure couldn't one. I drive an 81 Datsun 210 every day to Tacoma. It has a one barrel carburettor and there sure ain't no computer under the hood. My 85 Caravan has a two barrel carb.

Bon Ami in the venturi?? Yes sir, break in the rings and wear out the crankcase bushing or ball bearings as well as the rod bearing at the same time. Let's pour carborundum in there and really speed up the process.

That's enough for this post.