I’ve been working this week on tuning my engine, with lots of help and phone calls to Tracy.  Here is what I have learned.  Tracy, please chime in if I misspeak.

Don’t trust the manuals.  Here is the picture from the Nissan service manual showing how to connect the pressure regulator.  It isn’t correct.  The upper barb should be “fuel in” and the lower barb “return to fuel tank.”

 

After fixing this mistake, things went a lot better.

The other big lesson for me was that the “6 bars” for mixture listed in the manual to do the tuning isn’t necessarily the perfect spot.  You need to set a mid-range throttle setting, then adjust the mixture control until you get the highest RPM.  Now look at the mixture indicator, and use that as the setting for all further adjustments.  For me this was 9 bars.

Lastly, I need to let my engine warm up before making any adjustments.   There is a big difference in performance between a cold and hot engine.

 

I hope this helps others with their tuning.

 

If everything goes right, first flight should be this weekend.

 

Chris Mallory

 

 

Actually that order (for piston engines)  is:
 Mode 3, 2, 1 then auto tune.

Rotary engines go :
Mode 3,6,2,1 then auto tune.

What was the date of last update or service?  Might be able to tell about the snubber update from that.

Trace