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Old 06-21-2017, 08:10 AM
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DLE 55 Idle Vibration

I have a DLE 55 mounted on a Pilot Yak54, from 2500rpm to Max rpm it runs great and smooth. However at idle 1500-2000 I'm getting alot of shaking and vibrations. I have the low needle set to 1.25 turns out and the spinner and prop are balanced. I have adjusted the low and as I turn it in, it gets worse. I have it set to a high idle of around 2000-2200rpm. Is there anything I'm missing? under 2200rpm I feel like the plane is shaking apart.
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Old 06-21-2017, 08:41 AM
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Do you have the wings on the plane?
The wings dampen the shaking and vibrations.
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Old 06-21-2017, 08:48 AM
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yes, everything was installed and flown.
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Old 06-21-2017, 11:18 AM
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Don't know anything about the age or usage of your engine. Is it new? Well used?

I had a DLE 55 start vibrating and I had to put a crank in it as the crank bearings were going bad. I also stuck the case bearings in too. The engine did not have many hours on it either. I was disappointed as this was the first DLE with low hours that gave me those type of problems.

The bad thing was I had another one NIB about a year before and sold it because I did not see the need of having the extra engine. Even so it was an easy fix and has run great since the new crank install.
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Old 06-22-2017, 07:14 AM
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I think I would pull the motor and install something else if that's the problem. It looks like the one in this video when its down near idle. However mine runs better but shakes just as much.

Sbach with DLE 55 (2 min 4 sec)
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Old 06-22-2017, 08:02 AM
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Something you might try is tracking which insures the prop is square to the crankshaft. With prop installed rotate to align one prop tip with a stationary reference point. Rotate to the next tip and it should align exactly or dam close to where the first tip touched. Lack of proper tracking will definitely induce vibration because of unequal lift. We also found that proper tightening sequence of the prop bolts could help tracking and sanding the high side of the prop hub will help. Any and all credit for this procedure should go to Don's Hobby Salinas Ks. Don Apostolico now retired and his book "Gas Engines Giant Planes"
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Old 06-22-2017, 10:24 AM
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Quote:
Originally Posted by koenig427 View Post
I have a DLE 55 mounted on a Pilot Yak54, from 2500rpm to Max rpm it runs great and smooth. However at idle 1500-2000 I'm getting alot of shaking and vibrations. I have the low needle set to 1.25 turns out and the spinner and prop are balanced. I have adjusted the low and as I turn it in, it gets worse. I have it set to a high idle of around 2000-2200rpm. Is there anything I'm missing? under 2200rpm I feel like the plane is shaking apart.
Maybe your timing is a bit on the advanced side. Try to move the hall sensor as much as possible to the left (retard timing) and see if this is any better. Make a mark on current position before with a srew driver for example so you can turn it back on the same place. Helped on my DLE 30. You will loose some rpm on peak but engine runs much smoother.

Cheers
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Old 06-22-2017, 10:47 AM
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+1 regarding the timing. Most vibration at idle speeds comes from combustion impulses rather than mechanical balance issues that are more apparent at higher RPM. Timing can have a big effect on idle smoothness. You may have one of the problem ignition sensors that could cause an early spark with the resulting rough low idle. Carb mixture can also have a huge effect. The DLE 55 usually has a fairly smooth idle so what you are experiencing is certainly not normal.
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Old 06-22-2017, 10:52 AM
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I just picked up a timing kit from VVRC so once that gets in ill check the timing and see where its at. From what I read it should be 22-28 degrees after TDC right?
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Old 06-22-2017, 11:19 AM
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Keep us updated.
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Old 06-22-2017, 12:04 PM
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Will do, what idle RPM are you guys running?
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Old 06-22-2017, 12:33 PM
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28 degrees BTDC is normal measured with the crank tuning in the normal direction. Timing measured at the trigger point after the magnet passes under and away from the sensor.
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Old 06-22-2017, 10:15 PM
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A picture of how the engine is mounted would be great
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Old 06-23-2017, 05:50 AM
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Here is a photo of the engine mounting.
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Old 06-23-2017, 06:24 AM
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Quote:
Originally Posted by koenig427 View Post
Here is a photo of the engine mounting.
Yep, would say from the pic that your timing is on the advcanced side.
Loosen both srews on the hall sensor and move it all the way down.
Guess this will improve your idle.

Cheers
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