In my combustion engine class we had two single cylinder, 4 stroke engines that had glass cylinder blocks. Looked and sounded a lot like that. You could change the ignition timing and carb needle valve setting and see the difference in flame color. You could also see the difference between running ethanol and gasoline. Gasoline burned much brighter.
Edit: found a video from a guy who took the class the year before me. 
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
Last edited by Flieger; 08-09-2013 at 07:35 PM..
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