ORIGINAL: Michaelj2k
I have a Taurus with a Veco .61 and Perry carb. I had problems with a muffler pressurized tank, it was very sensitive to needle settings and would quit. I replumbed the tank to be vented to atmosphere and used the third line as a fill. The problem went away, it will suck the tank dry and not miss a beat at all power settings, tank level and flight attitudes.
Michael,
This thread is about the Evolution 0.60 NT and the carbs of these are all designed for normal muffler pressure and not an higher pressure stored in the tank by a check valve. That was why I did write
When using a check valve you will measure a much higher pressure level than with the “uncheckvalved” connection but the carbs all are designed to work without a check valve!!!!
About the Veco 61, but so “off topic”.
The Veco .61 was provided with an exhaust baffle not a muffler. First versions with a VECO carburetor and later also with a Perry carburetor. The dimensions of these carburetors were not based on tank pressure IMO, think for example about a small throat of the barrel or the range ability or characteristic of sleeve and/or needle valve(s)!
When mounting a muffler on such an engine can give some adjustment complications when using the pressure connection. Much easier to do of course is trying to run the engine without using the muffler connection. A good solution for the Taurus because the distance between tank and engine can be short.
Only point not to forget, the (Top Flite, MAN) Taurus was designed for up to 0.45 engine, so the carb of the 0.61 Veco will be on a higher position.
Cees