ORIGINAL: peter24
ok thanks for the suggestions, ive been useing duraglo 5 fuel, not sure on the oil content with out looking, maybe i do need to enlarge the exit holes a bit, didnt want to cut the cowl up to much if possible as it looks really good..... but would definatly prefer an engine that keeps running
as dead sticks are not my favourite way of landing, the cowel has the standard opening at the front, (ita a seagull extra 300s) and ive cut a large circle where where the head sticks out and cut around the exhaust at the bottom/side. looking at it it prob does need some more off it. thanks.
You don't have to hack the cowl to get a larger exhaust opening.
You want the opening to be directly behind the engine. Air that goes into the cowl anywhere other than directly around the engine actually shoves the warm air out of the way. Cool air follows cool air and is easier to move than warm. So the cool simply finds the exits and keeps the warm from leaving. Put the opening behind the engine and some of that problem is solved. Take a wedge out of the corner of the fuse/firewall right behind the engine. Slap some scrap wood in to line the "tunnel", and paint it with epoxy. Make it extend just beyond the end of the cowl and it'll work like a vacuum cleaner.