thank you for all your input. guess I won't buy 25 gallons of antifreeze to dump in a 55 gal drum! no, I'm in no rush, hell, it's raining every day around here, I can barely fly what I have.
the msd has a limiter circuit. I think I can trust it to work. I could disconnect the trailing plugs at first since they have no limiters. I have to review the msd literature. I think I need to snip a wire to make it think I have a 6 cylinder engine (?)
I need a light weight prop, considering how my engine mount came in at some staggering 30+ lbs. the exhaust was hefty too. I need to find a used one for now.
with a carb is there a need for an oxygen sensor? will I tune the jets othermeans? ken welter said he'd help me with those, he's figured his jet sizes long ago.
[Lynn - coffee comes in a can? I dump it from a bin at the store into a paper bag and grind it at home! ☺ yes, and real beer comes in a bottle requiring an opener! it's a Pacific NW thing]
ummm, the "elephant with diarrhea" . yes, it actually gets hits with google, but no sound tracks [thank you] ☺ kevin
4 cylinders for a 2 rotor. 6 cylinders if its a 3 rotor.
Unloaded the oxygen sensor will be all over the place with low temps. A heated sensor if you want to tune low power. Loaded the sensor will stay hot and read accuratly. And, or, EGT probes 3 incha out from the port. Best power is about 1600 degrees or, 12.7 F/A. This is actually very close to best power with a margin on the rich side. This to support good apex seal health. Once at cruise you can lean to rough running and back up a bit to smooth just like an airplane, except it will run far leaner than a piston engine. Of course the power goes down along with the reduced fuel flow. For short runs you just pull off throttle, but for long runs, the throttle stays up and fuel flow is reduced.
One tuning trick for racers is to get on a long straight at full tilt and shut off the fuel pumps. If the power drops off instantly it was too lean. If the power goes up a bit and then goes away, it was right on mixture. (just rich of peak EGT).
This would be too lean also for long apex seal life. If it builds power for a second or longer then goes flat, it was a bit too rich. Kind of crude but it works, and tells you where you are with no equipment at all. The idle circuit is all by itself.
Power is all from the booster. The big tube hanging in the middle of the choke, or main venturi (also changable) Overall fuel supply is the main jet. Mid range and transition is the emulsion tube. F-7, F-8 or F-11 is all you need for every situation. Usually F-7. Top end mixture is air corrector. Fuel level too high to too low is 3 main jet sizes. Two air corrector sizes is the same as one main jet change. 99% of all the jets anyone buys are usless and never get used. All of the jets to cover a scalding hot day or a winter day fit in a very small pill vile. If your chokes are the same as Kens, just use the same jats he uses. He hammers his with a nitrus shot to get off the water. He also shuts off the trailing plugs during nitrus to prevent detonation. He knows what he's doing.
You cannot keep new lightly oiled AN-4 bolts in a paper bag. There is a bar across the bridge from here. The guy has beer in a bottle. But its just to look at. He won't sell it or open it.
Don't feel bad. Its cold here in Florida. Some Northwest weather spilled down here.
Lynn E. Hanover
|