The operating problems you're experiencing can very well be due to the fact that you're running the engine inverted.

Inverting any model engine can make low-speed and midrange running problematic. With the cylinder head pointing down, the glow plug can become like a sump and become over-cooled at low throttle settings. All of the fuel that comes into the engine just doesn't get burned off at low throttle settings, and it all doesn't get expelled in the exhaust. The liquid can build up and "put out the fire".

Unfortunately, two people with identical enignes can have greatly-different inverted running characteristics. Ganging of tolerances, type of fuel, specific mounting of the engine, fuel system, propeller, muffler, and how they're set can make large variances in how the engines run.

Use the best plug you can find. We use the O.S. #8 plug, which we believe is the best R/C plug you can get. Many times, engine running problems have been solved with a new #8 glow plug.

Difficulty with inverted running has been with us since people started running engines. The only sure cure is a onboard glow plug battery that powers the glow plug at mid to low throttle settings.

We hope you find this information helpful. Should you have any further questions or concerns, please do not hesitate to contact us at this email address. (Please be sure to copy all previous emails into any future questions.)

DID YOU KNOW that our web pages now all contain FAQs? (Frequently asked questions) Please drop by and take a look! We hope you'll find the information helpful and valuable to you.

Sincerely,

Bill Baxter, Manager
Hobby Services
1610 Interstate Dr.
Champaign, IL 61822
USA

Phone: 217 398-0007
Fax: 217 398-7721
Email: [email protected]
Web: http://www.bestrc.com