I have a 29mm Posa Super Carb. On my 1641cc VW and have a similar situation. When I adjust the linkage so the slide opens all the way the engine quits. I have the throttle stop set so when the maximum rpm is reached the slide is about 90% open. Once I tried to adjust it out so I could get wide open throttle by changing the needle to a more rich setting. On take off when I was climbing out and had ram air the engine lost power and only regained power when I came back on the throttle. I flew the pattern and landed, then put the old needle back in and reset the throttle stop back to 90%. It works well now the way it is.
-Joe Scappoose Ore. > I have an 1835 VW with a 34mm Revflow carb and a 52x47 prop. > I ran it the other day and reached peak RPM at about 2/3ds > throttle. More throttle killed the engine. I asked Joe > Horvath about it and he replied : > > "A 34mm carb for an 1835cc engine is extremely large. The > air flow that the engine needs is considerably less than what > a 34 will flow. Therefore, you may reach max engine rpm of > 3200 with partial throttle, but the mixture may be rich. > .... Trying to tune a 34mm carb to the 1835cc engine will > not be easy. ....." > > Apparently I would be better off with a smaller carburator. > > If anyone out ther has a 30 or 32mm revflow they would like > to sell or trade, contact me off list (ankerst...@embarqmail.com). > > Brad Ankerstar, SW Ohio > N774A, KR2R, almost there. > 513 932-2514
