M8 motor balancing
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Road Warrior
Joined: Jul 2012
Posts: 1,521
Likes: 185
From: Ft Myers FL
M8 motor balancing
Hi all, quick question....
I understand ( from this forum ) that HD purposely de-balanced the M8 engine to give some of the feel of a HD motor....
Has anyone ever gone into the engine and replaced the "whateevr part " that makes the engine unbalanced....I for one would not mind a HD SGS that doesn't shake.....
NO flame throwers just asking for curiosity sake.
I understand ( from this forum ) that HD purposely de-balanced the M8 engine to give some of the feel of a HD motor....
Has anyone ever gone into the engine and replaced the "whateevr part " that makes the engine unbalanced....I for one would not mind a HD SGS that doesn't shake.....
NO flame throwers just asking for curiosity sake.
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,652
Likes: 11,419
From: State of Confusion
Hi all, quick question....
I understand ( from this forum ) that HD purposely de-balanced the M8 engine to give some of the feel of a HD motor....
Has anyone ever gone into the engine and replaced the "whateevr part " that makes the engine unbalanced....I for one would not mind a HD SGS that doesn't shake.....
NO flame throwers just asking for curiosity sake.
I understand ( from this forum ) that HD purposely de-balanced the M8 engine to give some of the feel of a HD motor....
Has anyone ever gone into the engine and replaced the "whateevr part " that makes the engine unbalanced....I for one would not mind a HD SGS that doesn't shake.....
NO flame throwers just asking for curiosity sake.
Road Master
Joined: Aug 2007
Posts: 809
Likes: 570
From: Detroit Metro Area
You have two versions of the M8 like the TC before it. The rubber mounted and the hard mounted versions. The rubber mounted has a single balance shaft and the hard mounted has two. Sounds like you may be interested in a version with the two balance shafts.
Thread Starter
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Road Warrior
Joined: Jul 2012
Posts: 1,521
Likes: 185
From: Ft Myers FL
( If I wanted a goldwing I would have bought one and saved a hell of a lot to boot)......but in years past I did have Honda's and Kawasaki....cruisers.
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,652
Likes: 11,419
From: State of Confusion
here's what they say about your bike
"For the first time in a rubber-mounted Big Twin, a single counter-rotating internal balancer is used to cancel 75 percent of the engine’s primary shaking force. When an engine with complete vibration cancellation was tested, riders rejected it; some vibration is an essential element of Harley’s unique feel. Riders of long ago accepted lots of raw vibration, but most riders today do not—and Harley-David*son here appears to be satisfying the faithful customer with some of the shake they love while also smoothing the engine to the degree that will attract new customers with an increased level of refinement. Heavy vibration is tiring, so long-distance riders want engine smoothness—but still want the drama of handlebars shaking at idle—and the relationship with the moving parts."
"For the first time in a rubber-mounted Big Twin, a single counter-rotating internal balancer is used to cancel 75 percent of the engine’s primary shaking force. When an engine with complete vibration cancellation was tested, riders rejected it; some vibration is an essential element of Harley’s unique feel. Riders of long ago accepted lots of raw vibration, but most riders today do not—and Harley-David*son here appears to be satisfying the faithful customer with some of the shake they love while also smoothing the engine to the degree that will attract new customers with an increased level of refinement. Heavy vibration is tiring, so long-distance riders want engine smoothness—but still want the drama of handlebars shaking at idle—and the relationship with the moving parts."
Road Warrior
Joined: Apr 2007
Posts: 1,382
Likes: 404
From: Illinois
P3R/Drago's is coming out with a new M8 crank that will eliminate the balancer (the crank will of course be balanced). It also adds a Timken left side bearing. Those guys will no doubt be doing a lot of forced induction work with the M8 once the bottom end is beefed up. Will be interesting to see how it works.
Road Warrior
Joined: Nov 2017
Posts: 1,593
Likes: 367
From: Northern MN
We need a point of reference. Secure one of those Hula girls that you see in old chevys. Superglue it on to your front fender. With your bike level, start the bike and film at least 25 seconds of said shake. Post it to the site. Sit back and wait for comments. There will be plenty.
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Road Warrior
Joined: Jul 2012
Posts: 1,521
Likes: 185
From: Ft Myers FL
We need a point of reference. Secure one of those Hula girls that you see in old chevys. Superglue it on to your front fender. With your bike level, start the bike and film at least 25 seconds of bsaid shake. Post it to the site. Sit back and wait for comments. There will be plenty.
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Seasoned HDF Member
Joined: Dec 2005
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From: poway
P3R/Drago's is coming out with a new M8 crank that will eliminate the balancer (the crank will of course be balanced). It also adds a Timken left side bearing. Those guys will no doubt be doing a lot of forced induction work with the M8 once the bottom end is beefed up. Will be interesting to see how it works.
You can't eliminate the balancer. There is no way to completely balance a HD V twin.