LET’S GO INSIDE THAT MOTOR…Harley-Davidson’s new Milwaukee Eight is loaded!
The Milwaukee-Eight (M8) motor is the first all-new engine design since 1998 when the then-exciting Twin Cam 88 engine came to life. By all accounts, the M8 is bigger, has newly designed cylinder heads with 4-valves per cylinder and meets the strictest emission standards of the world.
And, as you can see below, the 114ci, 1868cc CVO Street Glide looks absolutely stunning. My gearhead buddies tell me that the 114 puts out a whopping 100.6hp!
Oil-cooled or Coolant-cooled heads. You decide.
Best I can tell, you now have the option to getting oil-cooled or coolant-cooled heads. Go 2017 Roadking for oil-cooled or go liquid-cooled with the “Twin-Cooled” 107ci engine when you demo the Motor Company’s touring motorcycles. — the Road Glide Ultra, Tri Glide Ultra and Ultra Limited models.
The larger 114ci M8 engine comes with liquid-coolant cylinder heads for the CVO Street Glide and CVO Limited models.
Each cylinder now has four valves. (2-intake valves & 2-exhaust valves) for a total of 8 valves. The new motor comes with a higher compression ratio than its predecessor and has more displacement herego, the ability to push out 10% more torque than the Twin Cam.
Note the dual-sparkplugs per cylinder in the rocker box cutout below. Two sparkplugs are better than one from an efficiency of combustion standpoint.
Electrical Accessories…bring ’em on!
According to the Motor Company, the electrical charging system produces 50% more charge to the battery. This is a significant improvement given all the gadgets now used on touring bikes such as heated gear, big audio systems and a wide variety of electrical accessories.
Note the single chain-driven camshaft in the photo below. Single cams provide less chain noise, are lighter and just mechanically simpler than their Twin Cam predecessor. This cam is driven by a hydraulically tensioned chain. I personally prefer the chain-driven cams instead of gear-driven cams. They are much smoother and quieter in my opinion.
And, for the really big news!
Despite the extra power available with the new 107ci motor, it weighs the same as the now-prehistoric Twin Cam 88. There’s no fat in the M8…it’s all muscle. This means more power with less weight (aka: faster acceleration) and better overall fuel economy.
My Bottom Line…
Best I can tell, the new Milwaukee Eight (M8) is technically superior and mechanically better than the Twin Cam it will eventually replace. This said, it’s no high-performance, “Revolution Motor”.
As mentioned in a previous blog post, the new 107ci Milwaukee-Eight produces more torque and kicks out 92.5 horsepower. The 114ci motor is said to generate a whopping 100.6hp.
Yup, the Harley-Davidson Motor Company has a winner here with the Milwaukee-Eight in that it is a slightly more modern version of the Twin Cam and that’s a good thing.
I am somewhat surprised however, that in this day and age of EPA scrutiny and bureaucracy, that the excellent, high-performance EPA-compliant water-cooled engine found in the V-Rods has not yet become more dominant as a feature of Harley-Davidson motorcycles.
Ride Safe Out There.
About Harley-Davidson Motor Company – Since 1903, the Harley-Davidson Motor Company has fulfilled dreams of personal freedom with cruiser, touring and custom motorcycles, riding experiences and events, and a complete line of Harley-Davidson motorcycle parts, accessories, general merchandise, riding gear and apparel. For more information, visit www.h-d.com.
About Motorcycle Marc – I’m a motoblogger. I prefer to ride motorcycles but when I can’t ride, I blog about it. Since 2009, I’ve developed a strong, dedicated following of gearheads, motorheads, biker-wannabes and 2-wheeled adventurers who love motorcycles and everything motorcycle-related. #RideSafeOutThere – Marc J. Beaulieu (MJB)
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