I used this technique with all my engines and I have at a minimum of 5+ gallons with them and increasing. The material is soft, after I clean it, I wash it with dawn soap removing the chemicals and possible residue, blow it down with the air compressor, re-oil the parts, and re-install. Just dont scratch the exterior of the piston and the interior of the sleeve. Make sure the polshing cloth material is completely removed.
So why do people (world engine performance manufactures) port the bores polish valve piston, and the ports? Thats with any scale engines.
Does the castor oil being there a bad thing? The answer is no, but it sure raises the eye brows of tuning.
Last edited by JoeGuam; 02-23-2011 at 06:10 AM.