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I looked into this some about a year ago. If I remember right, the Polyol Ester formulation of something like "Red Line Alcohol Fuel Two-Cycle Premix" oil may offer some performance advantages over the Polyalkylene Glycol formulation I want to say Klotz uses. Again, it's been a year since I...

Assuming the entire piston top is characterized by a continuous concave surface (that is, there's no flat-top annulus surrounding the concave surface), a concave piston will decrease combustion chamber surface area, assuming you're running the same compression ratio as with a flat top piston...

Is this regarding cylinder head shape? That is, the cylinder head surface bounding the combustion chamber?

Hello. I'm a long time glow engine enthusiast who just now wants to start getting into marine glow/nitro engines. Who still makes these engines? Specifically, who still makes a marine glow engine that's of high-quality / high-performance that isn't just some knock-off with mediocre...