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IO-320 Leaning problem

Partial throttle around 20inch.
I will try on full throttle but I don’t want cause any detonation…

http://www.Bornholm.Aero
EKRN, Denmark

Przemek wrote:

Partial throttle around 20in

Try with full throttle at altitude. If it leans out nicely, it is definitely induction leak

Switzerland

By9468840 wrote:

Try with full throttle at altitude. If it leans out nicely, it is definitely induction leak

Excellent idea.

Przemek wrote:

I don’t want cause any detonation…

If you climb high enough to lets say 7000 or so, you will be anyway down to +/- 23" MP with throttle wide open.
It is definitely worth a try before you start throwing parts at the engine or paying your mechanic to trouble shoot.

Switzerland

You right. With troubleshooting cost its not a problem because I’m my mechanic.
There was no weather to check on high altitudes but I checked “bottle test” of divider and… that was a point.
I checked on other divider and no engine idle better and also reach peak “together” on all cylinders… I cant to make checkflight now due to weather but hopefully that’s end of this problem..

Cyl: 1/2/3/4

http://www.Bornholm.Aero
EKRN, Denmark

A defective divider?

Administrator
Shoreham EGKA, United Kingdom

Peter wrote:

defective

Yes.

http://www.Bornholm.Aero
EKRN, Denmark

Hi. I’m still trying to find out problem with leaning on my IO-320-D1B with precission fuel servo.
It’s longer storry and I did a lot of work:

  • reinstalling clean, painted induction system on new gaskets etc
  • repalcement old injectors to new gami’s
  • repair fuel divider (was not dividing equal)
  • replacement repaired fuel divider with another one (this overhauled at Dachsel – Germany for around 700EUR was still not dividing properly).
  • after last engine run’s much betted, idling etc
  • installation of new EGT/CHT monitor

The problem is that when I fly on ROP everything is super but when I’m trying to find a peak engine immidietly starts to run rough – go to LOP is not possible.

Last time on runup I found following behavior:

  • when I lean engine on around 1600rpm EGT rise, everything is ok
  • I’m reaching point (before peak) when engine starts to be rough, nearly quit – so normally too lean
  • When I continue leaning engine RPM suddenly rise instead quit
  • When I continue leaning EGT’s are falling a bit and engine run smooth (I assume we’re LOP).

Looks like strange behavior of fuel servo…. Maybe someone have any ideas except servo overhaul?

http://www.Bornholm.Aero
EKRN, Denmark

are you able to download the data from your engine monitor?

No, its simple one, not downloadable :/

http://www.Bornholm.Aero
EKRN, Denmark
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