went thru this about 3 or 4 yrs ago. first to get the utmost smoke
it will take a gas engine glow 2 or 4 will smoke but nowhere near as much if you arn't going with gas it will help alot to pre heat if its gas there is no need also keep in mind the more you use the cooper windings for pre heat it cuts down on smoke fuel.if you useing gas inject it in both sides of the miffler as close to the exhaust port as possible but not shooting in the exhaust port of the motor be sure to use a high volume check valve not the little
small ones.the pump you use is very important you can't produce
much smoke if you don't pump smoke fuel in( on my christain eagle with a 32oz tank and a 4.2 engine its about 4 - 5 mins. of smoke) and the most important thing is the smoke fuel i went thru all the recipes and after not realy being happy went with the real stuff use canopus oil this is the stuff they use on full scale aircraft for smoke.now on full scale they use this straight but since we use a whole lot smaller pumps you need to cut it i've used both diesel or kerosen haven't seen any differnce i usely cut it 50/50 i've been very satisfied with this but you could play around say 60/40 or 70/30 but rember if the volume the pump is pumping goes down so will the smoke .you could use the dry smoke or one of the other prepackaged bottles of smoke fuel but
the last time i looked i believe it was $12 - $14 a gal the cornopus oil is about $260 for a 54 gal drum and if you are going to cut it depending on how you cut it you'll windup with 80 - 108 gals.if dont want to get a lot check out some of the small airports
you'll proberly find some one willing to sell you a few gals. i went to our local one and carried a 5 gal can and he gave me 5 gals .
good luck and smokem up
roy