Thanks for all the great info . (Esp. Ed Moorman-great write up, thank you very much for taking so much time on my newb of a question) .

but after reading what you guys have to say, and looking back at the Reason i asked that main (orientation) question...... another one comes to mind.....

On my OS 40LA engine, there's that remote needle valve(sp?)..... and i was wondering if it matters how care away it is from the carb? (like could i remove it from the engin's backplate, mount it on the inside of my firewall (so that it protrudes enough to adjust) and run a line from it to the carb?

(i'm thinking about my second plane, and looking at the Venture 60 from BTE, or the Sig Somethin' Extra (both i won't even think about getting till i'm more than proficient with my trainer)..... what i wanna do is a cowling mod but move the needle valve of an OS 46fx back out of where the cowling would be so that only the glow head and muffler would prodrude from the cowling......and with the engine's "glow plug end" rotated to about 6 o'clock it would be accessable, and the exaust from the muffler would clear the plane almost completely.)

the second plane won't get built till winter next year.....if then, cause i'll be in the army then (i ship out for basic trainging in January) and i'll need time to settle in and get a shop together............. IN THE MEANTIME , i'll be flying my PT-40 trainer absolutly whenever/wherever possable