I just completed a new buschur 2.3 build and am burning alot of oil and have visual oil on top of pistons. The head was also completely new from very reputable shop. I checked compression and was 180 roughly on all 4.( I'm also at 6000 feet of altitude) I also performed a leak down test and was 5% across the board. I don't see anything obviously wrong with the valve seals. If anybody has any ideas it would be appreciated

 

Is it smoking?

 

Yes especially on cold start up

 

Sounds like valve seals.

 

There was a thread on here from someone that had a buschur motor that did the same thing. If I remember correctly the rings were not installed correctly. This was about 2 years ago.


If I remember correctly, he had good compression and good leak down, but it was an issue with teh bottom/oil rings and it was letting oil get past where the pin was. The 2.3 has a high piston pin offset.

 

Here is the thread I think you're talking about. It was an issue with the oil rings like you said. Page 8 is where he posted that he figured it out.


https://www.evolutionm.net/forums/ev...pistons-8.html

 

Thanks, I'm going to pull the pistons and see what we have