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bob27s -> RE: Possible fuel foaming in a Little Toni (4/21/2006 9:03:32 PM)
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Hi Andy,
Im glad the engine is performing to your expectations.
There really is nothing mysterious about the Jett engines. They simply run better than most. The carb is one of the best in the business.
As for your issue...
It is absolutely essential that you foam isolate the fuel tank... especially with that engine. If the tank is touching any part of the airframe, its going to foam the fuel. Make sure its wrapped in foam rubber, and does not touch anything directly..... its not worth risking a burnt up piston and sleeve set. There is no other way to fix that situation. And the armor-all in the fuel trick is just masking the problem... dont go that route if you can avoid it.
Many folks are now running either bubble-jett or tetra bubbless fuel tanks in the Minnow and Toni. Its a tight install in stock configuration, but with the bubble-jett type tank you can litterally cram the tank in place and have no worries about fuel foam. It just does not occure.
Typically we only suggest flying to about no less than 1/3 fuel remaining on a regular tank - particuarly for the issue you discovered. That last 3rd of a tank, the clunk is bouncing all over, often in and out of the fuel, and you are bound to pick up an air bubble.
The nice thing with a tetra or bubble-jett tank, is you can fly to the very last drop in the tank.... so often you can get away with a smaller than usual fuel tank (no worries of unusable fuel).
Fuel burn at full throttle on the 90LX is about 2 oz per minute. Lots of power comes from burning lots of fuel.
Something important. If you believe you have gotten the engine hot or it leaned out in flight, be sure to check the head bolts and ensure they are tight.
Let me know how you make out
Bob
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