An engine is like a safe deposit box with two locks. You can unlock one of these with such keys as carburetors, manifolds and ignition. But you can't open it up and get all the performance you want ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

Some exhaust valves have hollow stems containing a molten metal, like mercury or sodium, that helps carry heat away from the valve head and up to the stem and guide, where it can more easily leave the ...