For the most part that was a good write-up, but obviously John isn't going to bash 009's since he sells htem "by the ton".
I still need to get mine on a dyno and find where my motor's detonation threshold is, but it's just a couple of key strokes and I can change the whole curve
John is right about getting a 4 mpg increase when running a SVDA dizzy, just using engine rpm for the advance curve is very primative. That works awesome when your at the drag strip...either idle or WOT. In the real world you will be cruising at part throttle, and a centrifical dizzy won't know the difference between that and WOT. At part load you can run moar timing then WOT, so all you guys running stock carb and a 009 or even 010 are shooting yourself in the foot with mileage and throttle response. I recently went to ITB's which has the same issues of weak vac signal as running IDF's or IDA's (or any of the dual twin body carbs). Well that took some sorting but I have enough signal with proper indexing of my timing map to let me run 34-35deg at WOT and 45deg at part throttle. 30+ mpg is easy to get with that and the throttle response is amazing.
why I hate the 009 is it's advance curve, it's very quick and you'll have full advance by 3000 rpms. what does that mean? It means your stuck running the same timing at 3000rpms all the way to redline in all load conditions. Very primative indeed.
I'm not trying to change any minds but I do want to open eyes and get some thought juices flowing. Just because that's the way peeps do it and "it works" by no means makes it the best way to go about getting "performance" from our lil motors.
I'm stepping down from the soap box and hopping into my flame suit...bring it!