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Posted by: Type 4 Unleashed Dec 15 2007, 12:39 AM

Posted by: sww914 Dec 15 2007, 03:55 AM

Not much cooling going on between those cylinders. Intake & exhaust on the top?

Posted by: Jake Raby Dec 15 2007, 08:16 AM

Actually thats the bottom..

Lycoming engines use updraft carbs under the engine. Those heads are designed for steady state running at altitude, so their characteristics don't include acceleration properties.

Posted by: Twystd1 Dec 15 2007, 04:04 PM

Jake,

What is there about these steel cylinders that keeps them
from having "Acceleration properties".?

What would prohibit their use in an automotive application?

Clayton

Posted by: davep Dec 15 2007, 07:12 PM

Jake was talking about the heads specifically.
Port design and valve size would likely to be tailored to provide specific advantages at a particular cruising RPM. An engine designed for specific applications would not likely do well in another specific application. Just compare 1/4 mile engines with sprint car engines with endurance car engines.

Posted by: Krieger914 Dec 15 2007, 09:15 PM

Aircraft engines run at mostly continuous rpm. On a piston engine you usually set the throttle and lock it in a position. Yes, you do vary it from time to time, but nothing like working that gas in a car. I think the volume and airspeed of air into an aircraft engine are much higher.

Posted by: Brando Dec 16 2007, 03:37 PM

volume may be high, density will be low. As altitude increases, air pressure decreases.

Posted by: Type 4 Unleashed Dec 16 2007, 05:23 PM