Doug Rupert wrote: >>OK Colin I know this one is going to start a flame war but misinformation is worse than no information. First of all VW has been putting fuel injection on air-cooled engines since the late sixties or early seventies. <<
I used to be a "factory" VW mechanic at a dealership, and I have been a VW head since I was a kid, and I can tell you that those early "electronic" VW systems are problematic. If any one of about 25 ground wires falls off, you start having problems. I wouldn't fly with one of those if my life depended on it (and it would). Bosch CIS is far better (as you said), but it is bulky and way heavier than a carb. I know, because I've weighed it. I'd planned on using CIS myself, and I still may, but it's going to mean a bulge in the bottom of my cowling, and a weight increase over the lightweight carb and intake that I now have. I already have a fuel return line, which I'm now using as one of my two "completely redundant" fuel systems. But I'm just not sure it's worth the tradeoff. I can lean that Ellison down just as much as the CIS. The big advantage would be the elimination of carb icing, carb heat and mixture control knobs, and their constant adjustment. But the downside is weight, complexity, and having a 75 psi fuel pressure in the lines. You could start quite a fire in a hurry, and empty a tank in a hurry, with a ruptured fuel line. That's all manageable, and it's a trade, but the trade that made my decision is that I'll be flying at least a year earlier with that Ellison, than if I "engineered" a CIS setup, if not more. Once I get flying, I may reconsider CIS injection. There's more on this at http://home.hiwaay.net/~langford/CIS.html ... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net
