Hi! Garry.
The effect is "pre-ignition" mostly caused by glowing carbon in the
cylinders. IMHO I would think it is due to running too rich and so having a
build up of carbon which will have small blobs that glow which ignite the
incoming charge of mixture. You need to address the problem because it could
cause a damaged con rod etc.
Are you running on Avgas or Unleaded Mogas ? I would try a change or even a
mix to see if it cleans out and stops. Of course I don't profess to speak
with any authority on a Rotax Installation.!
Regards
Bob Harrison G-PTAG Europa MKI /Jabiru 3300
-----Original Message-----
From: forum-owner@europaclub.org.uk
Subject: Rotax 914 Dieseling
Just recently, after 220 hours of operation, my Rotax 914 began "dieseling"
after shut down. Never happened before, but now does it every time. I know
that dieseling is caused by a "hot spot" somewhere in the combustion
chambers, but where and why escapes me. I've pulled the spark plugs and
aside from having some gray lead deposits on them, they look fine. I plan
to replace the plugs, but doubt that they are the cause. Interestingly, the
dieseling doesn't require a really hot engine. A few days ago I started the
engine and taxied 100 yards to the fuel pumps. At shut down the engine
dieseled.........and we know the engine hadn't yet even warmed up. I've
checked the mag grounding connections, and they work fine. It is definitely
a dieseling condition. Anyone out there experienced this and what
conclusions did you reach?
Garry V. Stout
District Manager, AT&T Business Services
Phone: 813-878-3929 Fax 813-878-5651
*****Please note new e-mail address******
|