IrishAl

The float bowls fill up under gravity only, and the goal here is to speed up this process. By opening the throttle fully, the low pressure at the venturi maximizes the low pressure in the float bowl, and this low pressure 'sucks' the fuel in. By closing the choke, which is upstream of the venturi, you are further decreasing the air pressure in the carburettor and in the float bowl, thereby increasing the 'suck' effect. I would add one caveat to Roger's advice. More often than not, a hot engine will refuse to fire with the choke closed, and it's possible that you could end up cranking away even though there's plenty of fuel in the carbs; thus, I would be inclined to open the choke every few seconds during cranking in the hope of hearing her fire up.

Corey, in some cases R&D does justify high prices, but that's a simple PCB that any electronics guy could draw out on a napkin over dinner. R& D costs to design that would be negligible to zero. I think the reason for the high price is more like: we have a captive market so we can charge what we want. Of course one doesn't begrudge a good profit, but within reason, please! The same astronomically high prices are commonly charged for PCBs that come out of heavy plant, agricultural machinery and industrial equipment, so it's not just aircraft manufacturers who make exorbitant margins on such items. They do it just because they can.

Congratulations - that's a great use of limited knowledge to make a fix. Combining limited knowledge with a bit of sound reasoning and a willingness to experiment and learn new stuff can go a long way - I love it. What I don't like is manufacturers charging such astronomical amounts for PCBs that cost literally a few dollars to make - $1300 - come on!

I think admin makes a good point - while nobody wants a brawl, neither does anyone want an anaemic forum where you can't debate something vigorously and thoroughly. In my view, the 'acceptable line' is crossed as soon as one person in a debate takes a personal swipe at the other. Often these are innocuous little comments, but they are always personal in nature and they always succeed in changing the debate into a personal fight. I would also add that I have observed more than one person here making such comments. It always takes two to tango. I would suggest that anyone who makes disparaging remarks about another individual should come under the three strikes rule - no questions asked. Cite a few examples of what this entails so everyone is clear on it to start with. That might keep the discussion lively, but without allowing it to descend into innuendo or insult. (Such comments are usually emotive in nature rather than factual, and they are a clear invitation to argue personally rather than debate a subject. For example, I would say that Post 28 in this thread is a good example of the type of comment that should be banned.)

I also note that you didn't upgrade your starter motor - are you getting on okay with the standard item?

Gravity Knight, you might consider getting your turbo here. And maybe fuel injection, too. How does 160hp sound? https://www.facebook.com/edgeperformance.no/ Enjoy! By the way, at 3.75gph and 5500, it seems like there's some extra performance in there that you're not making the best of, especially considering all that extra displacement.

This is probably the most famous example of flutter in the world. Even today, engineers can't agree over the precise cause, so it's a pretty complex subject. https://www.youtube.com/watch?v=xox9BVSu7Ok The bridge didn't have the option of changing the wind speed, but - mercifully - pilots do.