Don't know what thinking about this

[Guest 4aplat]

Hi

 

I was told that it could be a problem of temperature of the cylinders

 

may be my engine runs too cold.

 

Next Wednesday I will open and check the valve guides and take pictures

 

MicheL

 

 

[facthunter]

jabiru Running too cold.

 

Not very likely really. Every one I've looked at seems to be running hot, if it has a problem. There are some fairly cold places in australia, and apart from some starting consideratons, no problem with the cold. 4aplat, your plane is a fairly slow one. This could reduce the airflow over the motor.

 

Re the valve guides, look up Alpha (UK). They make a lot of valves and guides for performance motorcycles and use some exotic coatings and valve guide materials. I don't know what to think about using SEALS on the valve stems in a high temperature situation. You should only get oil through the INLET valve guide as there is positrive pressure in the exhaust on average. The inlet valve guide can have a much closer fit than tha exhaust, also. Nev

 

 

[Guest 4aplat]

I've got a special "turbo cone" that helps colling the engine even on the ground

 

the plane fly at 130 km/h and I've got the valves (from a VW golf (rabbit) 16s)

 

I will make a new fly this week and I will note the EGT, CHT and oil temp

 

MicheL