Checking for the Perfect fit for a Nitro RC Race Engine
By Marten (Marty) Davis | November 8, 2008
TEST THE FIT of a Nitro RC Racing Engine:
25 years ago, a very accomplished model boater told me of a way he tested his engines to determine if they had The Perfect Fit. Since he was by far, the BEST MODELER at that time, I listened.
Following is that secret to the way to test the fit of the piston/liner, to see if you have a great fit and seal.
I assemble the engine and apply a drop of "silicone platelets" to the piston surface on initial assembly. You can get this at Boca Bearings as (Midas Touch Lubricant). After I turn the engine over several times to coat the piston and imbed the Teflon Platelets slightly, I put in some methanol to clean out most of the oil residue.
I put in the Glo Plug in the engine. The way that I test the engine for seal is by rocking the engine back and forth over top dead center with the flywheel. If you can't rock it back and forth over top dead center without loosing the seal and leaking down for at least 20 bumps, you don't have a good fit.
After you find that you have an engine with the great fit, run the engine in your model. Get it VERY WARM for a short period of time. Then run the engine rich for a short period, then run VERY WARM, etc. Several cycles like this will allow the metal of the piston and liner to find their set and you should have a GREAT ENGINE.
Re-try the bump test AFTER you run in the engine to make sure that the seal lasts.
This test will be one of the best tips you will ever learn and will accurately predict the success of your engine build.
The fit is "Far More Important" than any timing numbers or ANYTHING ELSE, and will be your primary indicator of a great engine.
All considerations of the engine build are built are built into this test. The liner/piston roundness, the seal of the liner to the case, and the seal of the head to the liner.
If you enjoy this technical article, invite your friends to join the Mailing List on the http://Engine-Analysis-Software.com webSite.
THIS TIP IS THE MOST IMPORTANT PART OF BUILDING ANY NITRO PERFORMANCE MODEL ENGINE !!!!
Marten (Marty) Davis
Owner - Engine-Analysis-Software.com
Many Time National Champion
IMPBA Member of IMPBA Hall of Fame
Many National Speed Records
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