.049 Babe Bee, Black Widow, Texaco or Tee Dee

What is the difference in these engines? I mean, power, rpm, easy to start, quality, prop size, good, bad, etc.

.049 Babe Bee

.049 Black Widow fuel tank looks larger than Babe Bee.

.049 Cox Texaco fuel tank looks larger than Black Widow.

.049 Cox Venom

.049 Tee Dee no fuel tank built on engine.

I am building 6 airplanes all 1/2a size and I need 6 engines. It looks to me like the Texaco costs less than the Black Widow. I want an engine that starts easy, runs good, continues to run good after 100 flights.

As I recall the Babe Bee holds about 3 minutes of fuel. The Black Widow holds a little more fuel maybe 4.5 minutes. Tee Dee = fuel tank size.

I've never heard them referred to as "intake" ports - always as "transfer" ports. This is because they "transfer" the charge from the crankcase to the cylinder.