The next 3 years are going to be very interesting. How Harley-Davidson, and other brands, are going to adjust to the very stringent US EPA emission regulations to kick in in 2013? A liquid cooled engine? Almost certain. When? Harley 2012 new bikes about to be unveiled seem to keep the V-Twin air-cooled engine with an extension of the 103” to more models. And after that?
A certain Charles, one of my readers who animates in France a website called Info-Motos, unearthed from the US Patent & Trademark Office, a patent filed by Harley-davidson 1 1/2 years ago showing a V-Twin cylinder head cooling system. As you can see on the drawings, a cooling liquid passage runs through the cylinder heads to reduce their operating temperature. The cooling system seems to be made of 2 radiators, fans and hoses hidden within the fairing of a touring model with an electric water pump located at the bottom of the frame. It looks like a very simple simple system, something that Harley-Davidson could put in production very fast. But let’s remember that brands filed multiple patents and don’t use them all, and that this system may be modified if used. One thing for sure. Harley engineers demonstrate in which direction they are going. No ugly radiator hanging in front of the frame. Relief… Enjoy all the drawings.