Re: Carbon Caked on PIston Crown
- From: "Manjo" <manjo1111@xxxxxxxxx>
- Date: 11 Aug 2006 05:05:46 -0700
FB wrote:
Manjo wrote:
2. The crankcase breather tube used to run into the air intake stream
to the carbs, where the crankcase gases would be burnt away. Now the
tube runs to a filter element mounted on the bike frame. I'm wondering
if excessive crankcase pressure is "pushing" oil into the combustion
chamber as the piston moves downward?
Try making a road draft tube instead of running the crankcase breather
to one of those little filters. A road draft tube goes vertically down
behind the engine and the end is cut at a 45 degree angle with the long
side of the tube forward. This creates turbulence which sucks vapors
out of the crankcase.
3. There's just too much piston "rock" allowing oil to creep around
the rings at high speeds.
That sounds good. Piston rock is one of the reasons why Ducati Corse
engines are only good for 30 hours of operation.
Are any of these a possible cause of the carbon build-up?
You might try leaning up the idle mixture a bit. Then the engine will
burn oil vapors as fuel instead of allowing them to cake on the piston
tops.
FB,
Thanks for the tips and ideas. The draft tube and leaning the idle mix
will be done shortly.
On piston rock: is there a Ducati fix for the piston rock? If not,
should I look at a rebore and new pistons/rings, or perhaps
new/different pistons?
TIA for your reply.
Manjo
.
- Follow-Ups:
- Re: Carbon Caked on PIston Crown
- From: Manjo
- Re: Carbon Caked on PIston Crown
- From: FB
- Re: Carbon Caked on PIston Crown
- References:
- Carbon Caked on PIston Crown
- From: Manjo
- Re: Carbon Caked on PIston Crown
- From: FB
- Carbon Caked on PIston Crown
- Prev by Date: Re: engine wont stop reving high
- Next by Date: Re: 1977 cb750 electrical problems
- Previous by thread: Re: Carbon Caked on PIston Crown
- Next by thread: Re: Carbon Caked on PIston Crown
- Index(es):
Relevant Pages
|
