ORIGINAL: ChriCYWG
Sorry, I posted this in the general forum, but then found the gas engine forums...
Im getting a Jackal for my main Christmas gift.. I'll need to cover the engine,retracts etc.
Engine wise.. I have had no luck with the Evolution engines... my Alpha 40 TPS engine ran great for he first day and was nothing but a nightmare after that.. dead sticks, surging when running to full power, power lags, bubbles in the lines... basically the same problems everyone else seems to have.. needless to say I am dropping an OS 46 on the Alpha over Christmas...
So Jackal wise... what would be a good non Evolution motor to install... it seems they push it with the 60NX and the tuned muffler .. I was thinking an OS55 with a Jett Stream muffler, or even an OS61 with a Jett muffler, or getting a Jett 56 / muffler for it..
Anyone have any suggestions/comments?
Thanks, and Merry Christmas!
Read more:
http://www.rcuniverse.com/forum/m_10...#ixzz18mtUYKtC
I doubt if changing from the Evolution engine to something else is going to improve your situation.
Bubbles in the fuel line is not caused by a defective engine, although the reasons that bubbles are being formed and the fact that they are being formed can ruin any glow engine made. You have either a fuel tank problem or a fuel line problem. If any part of the fuel tank is touching any solid part of the model airplane, such as poking the fuel tank neck through the firewall or resting the fuel tank's belly on a wooden bulkhead, you have found your problem. I'm assuming that you have already checked/replaced the fuel line in the system and ensured that the fuel pickup clunk is not close enough to the rear of the fuel tank to suck itself up against the rear of the fuel tank and closing off the engine's fuel source.
A brand new engine, any brand, must accumulate a certain amount of running time before one can expect to tune the engine to perfection and end deadsticks. That's just the way glow engines are these days. Fortunately, it doesn't take all that long for the engines to break-in. Usually one half gallon or one gallon of fuel for the really stubborn ones will do the job. The difference in the engine before and after break-in is quite startling. What was a pig-headed, uncooperative engine turns into a silky-smooth piece of a technical marvel once break-in is achieved. The cheaper the engine, usually the longer the required break-in. Buying an OS engine when you are a beginner isn't a bad idea as it will get you flying successfully in the quickest amount of time - UNLESS YOUR MODEL'S FUEL TANK SET UP IS DEFECTIVE. Most are.
What's the fix? Go to the hobbyshop and look for a fuel tank that will fit completely inside of fuel tank compartment with room for about a half inch of uncompressed foam around every side of the fuel tank. DO NOT LET ANY PART OF YOUR FUEL TANK TOUCH ANY SOLID PART OF YOUR MODEL. The fuel tank needs to be completely isolated from the engine's vibration. Otherwise, your engine will be receiving fuel with lots of bubbles in it, which will mess up any attempt to adjust the carburetor properly.
Good luck and let us know how you fare.
Ed Cregger