Need more Grunt
Road Warrior
Joined: Jun 2007
Posts: 1,788
Likes: 4
From: Here
Good suggestion. All Harleys are way over geared. I changed the crank sprocket on my Dyna from 25T to 21T to wake it up. That gives a 19% increase in torque at the rear wheel for just a few bucks. Unfortunately latest Harleys use a different design of crank sprocket and I don't know of any replacements being available yet. That is the best place to make gearing changes.
Sponsor
Joined: Dec 2007
Posts: 12,084
Likes: 829
Cam specs
This is the tale of the tape:
intake----- 20/45, 245 dur., .570 lift, 102.5 center
exhaust----47/18, 245 dur., .570 lift, 104.5 center
From 98" to 124". This took some time to design, in-house, and had another in the works, a couple years ago, but the bottom fell out of that. Different story, and in hind sight, glad it did.
Mike Pederson, GM of Andrews, said it looks VERY good.
Scott
intake----- 20/45, 245 dur., .570 lift, 102.5 center
exhaust----47/18, 245 dur., .570 lift, 104.5 center
From 98" to 124". This took some time to design, in-house, and had another in the works, a couple years ago, but the bottom fell out of that. Different story, and in hind sight, glad it did.
Mike Pederson, GM of Andrews, said it looks VERY good.
Scott
Ultimate HDF Member
Joined: Feb 2007
Posts: 7,663
Likes: 7
From: Northeast Ohio
This is the tale of the tape:
intake----- 20/45, 245 dur., .570 lift, 102.5 center
exhaust----47/18, 245 dur., .570 lift, 104.5 center
From 98" to 124". This took some time to design, in-house, and had another in the works, a couple years ago, but the bottom fell out of that. Different story, and in hind sight, glad it did.
Mike Pederson, GM of Andrews, said it looks VERY good.
Scott
intake----- 20/45, 245 dur., .570 lift, 102.5 center
exhaust----47/18, 245 dur., .570 lift, 104.5 center
From 98" to 124". This took some time to design, in-house, and had another in the works, a couple years ago, but the bottom fell out of that. Different story, and in hind sight, glad it did.
Mike Pederson, GM of Andrews, said it looks VERY good.
Scott
I'll go back and sit in my corner now.
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,148
Likes: 6,170
From: SE Michigan
Good suggestion. All Harleys are way over geared. I changed the crank sprocket on my Dyna from 25T to 21T to wake it up. That gives a 19% increase in torque at the rear wheel for just a few bucks. Unfortunately latest Harleys use a different design of crank sprocket and I don't know of any replacements being available yet. That is the best place to make gearing changes.
Road Warrior
Joined: Jun 2007
Posts: 1,788
Likes: 4
From: Here
Yes. That was done by the factory on the '10 models. The '07 & '08 really benefit from some extra rpm in 6th.
Road Master
Joined: Jan 2008
Posts: 853
Likes: 5
From: Mnpls MN
Good suggestion. All Harleys are way over geared. I changed the crank sprocket on my Dyna from 25T to 21T to wake it up. That gives a 19% increase in torque at the rear wheel for just a few bucks. Unfortunately latest Harleys use a different design of crank sprocket and I don't know of any replacements being available yet. That is the best place to make gearing changes.
The right cam and the right tune seems like a solid direction to go.
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Seasoned HDF Member
Joined: Dec 2009
Posts: 9,165
Likes: 1,910
From: Doghouse... mostly
I'm sorry for the lag in response time to the replys to the question(s) that I posted but when you have a J O B to deal with, sometimes we all get a little too busy. I thank you all for your input and you have given me a defininte place to start with with my need for more low and midrange end GIDDYUP. Seems like I need to do a little more reading and investigation on this forum regarding my topic as I know there are lots of Ya out there that have more mechanical knowledge on this than I do. Again thank you and it sounds like a 30t sprocket along with the proper camming will open her up.
Road Warrior
Joined: Jun 2007
Posts: 1,788
Likes: 4
From: Here
Not really any change. I actually get about the same on the hwy as before and about 2 mpg better in 5th on the two lane roads. The engine is working easier and requires a little less throttle to keep the same speed.