Based on the picture, it looks like you had one cylinder near peak or slightly LOP while the others were ROP. That will make it shake.

What is the gami spread? Looks a bit high based on the engine monitor. They often underestimate unless you go really slow as well. You end up with false peaks.

Try adding more fuel to get that other cylinder 50-75ROP.

Most of my "shake/vibration" issues have been solved by tightening the spread and improving ignition.

Todd,
Maybe a call to Jeff LaVelle is in order. His completely stock (short wing) G3 will do 345Kts or so. I believe he has Lycon engines in his corner. No idea what FF he would be running.

Jeff LaVelle Glasair III at Reno
For those guys wondering just how fast these homebuilts can go, Jeff LaVelle from Mukilteo WA clocked a 396 mph qualifying lap at Reno this year, and saw a race average of 393 mph winning Sport Gold in his twin-turbo Glasair III.

In fact, had he run in Unlimited, Jeff and his Glasair would have qualified 9th in the Unlimited series (field of 19), and his speed would have placed him 2nd in Unlimited Silver just behind Will Whitesides in the Yak-3U 'Steadfast', or 4th in Unlimited Gold.

Now Jeff's Glasair III has a very impressive engine, but this was a really impressive feat. Jon Sharp maintains the Sport Qualifying and Race Records in the original NXT 'Nemesis', at 409 and 402 respectively - for now.

Jesse, The shake is more pronounced at high MP/slower speed. At full takeoff power I am using 31 GPH and the shake is the worst.

Being a Lycoming I do not have GAMI injectors, but I do have the data that I am going to chart tonight.

The shake at altitude and lower MP is very minimal - you really do not even feel it.

Completely stock? What does that mean with an experimental? Many of the Reno planes have intake air drag reduction at a minimum. (Clamshells etc.)

"Twin turbos..."

Yep, he has the fast one. He also has a prop similar to mine except that it has to be scrapped every 25 hours. Did he get out of jail yet?

Has the prop been dynamically balanced yet? Can it be rotated 180?

It has not been dynamically balanced yet, but it is the same shake I had in the old prop. The prop was installed according the instructions that came with it concerning what position vs engine stroke position, etc.

If you were going off of your old ASI before that might account for some of it, my ASI consistently reads 6-7kts higher than my Garmin at high speed cruise. Really sweet looking ride Todd, looks like a rocket... the paint really compliments the shape.

Thanks Adam - I agree with you on the ASI thing. My Barons (your included) were all that way. They were 7 knots fast at 180 indicated and 3 knots fast at 100.

I was also estimating the OAT so that could have made a difference as well.

Thank Heaven the FAA is protecting us certified owners from that G3x! They are so wise and smart! Makes me grateful to pay my taxes!

Tod,

If they would allow this system in TBones the values of those planes would go up 100% overnight. The autopilot problem is one of the reasons I did not buy a Bone. Imagine having this system with autopilot that is user tweakable in 5 minutes for your tbone.

Same goes for 58P Barons and Dukes. They only have 1 or two old Autopilots that are certified for them. Replacing them is a $40k expense and then you still have an old autopilot.

Looking good, let us know how the AP altitude changes are, I've seen differing opinions on how they have setup the interface and want to see it first hand

Curious what your prop issue ends up being

I still think having your VSI scaled to 4kfpm is silly, VSI is more useful in the lower ranges to calculate glide angles for approaches, even if you do dive bomb descents to keep high ground speeds

Will do. I am still getting accustomed to the autopilot stuff. When the autopilot is engaged you are always in some sort of pitch mode whether it be PITCH, IAS, VSPEED, or ALT HOLD. You must always adjust the ALT SELECT value when climbing or descending or the autopilot will try to fly to what you have selected.

As for the VSI - I wish it had the ability to go above 4k. The fast descents are simply to stay in smooth air as long as possible.

I loved GAMIs in my lycoming.

I started to do the 4-way and then started playing around with other stuff and forgot. I do remember going West I was doing 129 knots and going East I was doing 289. That comes out to 209.

I don't think it is ignition related as the LightSpeed ignition appears to be working great. If you turn off the mag on the runup you lose nothing, but if you turn off the electronic you lose 175 RPM. Just don't know what to think. Looks like a call to Lycon is in order. I feel the need - the need for speed