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drolston · 07-14-2019, 04:26 PM

Road test #3: Put in .047 jets in the center carb and gave it a hard road test. Performance is as good or better than with the stock .45 jets. The engine seems a little smoother at 60 - 65 mph, about 2600 rpm. It was the same temp as yesterday's test, 94 degrees. The engine ran maybe 10 degrees cooler (about 200 degrees) at highway speed. So running too lean is a contributing factor when under load (high speed). A step in the right direction, but the radiator is still coming out.

The Champion aluminum radiator has 351 square inches of core. The brass truck radiator has 451 square inches. If that does not do it, I am changing hobbies back to model airplanes.

07-14-2019, 04:26 PM	#15
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: Running too Lean? Road test #3: Put in .047 jets in the center carb and gave it a hard road test. Performance is as good or better than with the stock .45 jets. The engine seems a little smoother at 60 - 65 mph, about 2600 rpm. It was the same temp as yesterday's test, 94 degrees. The engine ran maybe 10 degrees cooler (about 200 degrees) at highway speed. So running too lean is a contributing factor when under load (high speed). A step in the right direction, but the radiator is still coming out. The Champion aluminum radiator has 351 square inches of core. The brass truck radiator has 451 square inches. If that does not do it, I am changing hobbies back to model airplanes.