R/C Tech Forums - View Single Post - RB Concept Engine Thread..

01-18-2010 | 06:59 AM

#930

Chris Peralta

Tech Master

Joined: Nov 2009

Posts: 1,192

From: Colorado

Quote:

Originally Posted by razzie

Hi Guys,

I have a RB C5 which have been running flawlessly all these while. It has only about 5gallons of run time. I have been preparing the engine for this season race and its been causing me a real headache. I'm using RB std no6 plugs and 25% Byron all these while. The idling seems to creep up showing sings of it getting lean.Even when I reset the needles to its factory settings. I have changed all the o-rings but to no avail. The pinch at TDC is still very good. What could have been the cause?Btw, what is the appropriate length of the exhaust tubing? If I were to use a longer tubing, what would be the changes to the back pressure? Currently my tubing is about 6" long.

Sounds to me like there is an air leak of some sort. Be sure to check the rubber gaskets in your exhaust system. If the one on the engine is torn or even the one between the header and pipe is torn you will have all kinds of tuning issues. Also check the fuel tank it's self and make sure it is sealing real well.

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