JGrc,

I have been flying a twin for over a year and find that most of what is said here so far is true. Let's put it into perspective. Reliable engines are key. I can't say enough about that point. If there is any doubt before take off, don't do it. Save the flight for another time when you are sure both engines are operating properly. As far as tunig both engines so they are synchronized, it would be wonderful if two different engines would perform equally by simply opening and closing the throttles, but they don't without some careful perseverance on your part. MY twin flys well and at full throttle they sound like they are in synch. If I back off the throttle the sound tells me that they are not match synched. They may be off by 200 rpm between full throttle and idle. It still flys the same and if it weren't for the sound I wouldn't know it. I bascally did two things when I set up the engines: 1) I tuned each engine separately to run at full throttle using the needle valve. This gave me confidence that each engine was not to lean or too rich. I wasn't forcing one engine to tune to the other. Although they do sound like they are in synch. 2) I set the linkage up for the throttle servos using the blank end of a drill bit. I set the first engine at 1/2 throttlw stuck the bit into the venturi so I could close the throttle until it touched the bit shaft. I noted the throttle position on the transmitter stick and then moved to engine #2. I set the transmitter stick at the noted position and adjusted the servo linkage until the throttle closed just touching the drill bit.

After doing this, I then knew that both throttles were going to open and close the same amount. I started each engine and tuned each one by itself to obtain the best running condition. I felt very comfotable that they were going to be reliable. I put a tach on each engine at various speeds and did find them off a little but not more that 200 rpm.

Finally, I have only heard good reports about using the Twin Synch and I am going to try one myself.

JGrc, make sure about the reliability of the engines, and enjoy your twin.

Sledge_78