As the old saying states," know who your sources are!"
So I'm issuing the disclaimer that I'll probably go to my grave never having successfully learned or flown the Pattern.
For what it's worth then, I have an Enya 45 RC - 6002 that I converted to control line and mounted on an ARF Tudor. I made the venturi with a .250" ID opening at the narrow portion ( That Looks About Right!). Can't remember if the spay bar/needle is OS or Enya. Zinger 11/5 prop, Enya muffler, 10/27 fuel, and .015" x 65' lines. The runs are rock steady (no 4-2-4) and good line tension in all the maneuvers that I can do. The plane/engine combo gives tremendous confidence in trying maneuvers that scare me to death; verticle eights, hourglass and cloverleaf.
The -6002 is a single ring, baffle, ball bearing engine. Have no info on the internal differences between the -6001 and -6002. The Tudor is set up with carbon fiber/titanium push rods, line slider and taped hinges. A great trainer.
Ara