What creates these variances in HD models torque?
Thread Starter
|
Stellar HDF Member
Joined: Feb 2014
Posts: 2,710
Likes: 529
From: Lethbridge, Alberta Canada
- The Mustang, Camaro, and Challenger cars
- Almost any ladies' designer dress
- Ever looked at a Ducati 996 from above the bike? Don't tell me it's a pure coincidence that it has the EXACT hourglass shape of a perfect female body
- Any Victorian styled modern house
This is what we appear to WANT in the products we buy.
Jim G
Thread Starter
|
Stellar HDF Member
Joined: Feb 2014
Posts: 2,710
Likes: 529
From: Lethbridge, Alberta Canada
They key is "less total back pressure", NOT a larger exhaust that "corks" the engine no more or no less.
Jim G
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
The softail models have balancer shafts, which are a significant parasitic load and will inevitably affect power and torque, wherever it is measured. The Rushmore touring engines have water-cooled heads and they enable the factory to raise CR and use better cam profiles, compared with the other models, which along with their 2-1-2 exhaust deliver improved performance. The Dyna models are currently the datum by which we can judge the other two.
I don't believe that touring mufflers will benefit a softail, but an aftermarket 2-into-1 will, by boosting low/mid range torque.
It is no concidence that when Buell adapted the Sportster engines and used a 2-into-1 with equal length pipes, they were able to significantly increase CR and use wilder cam profiles to greatly increase performance. The current touring exhaust system is an adaptation of that principle, to boost torque, which the softails and dynas do not currently use.
I don't believe that touring mufflers will benefit a softail, but an aftermarket 2-into-1 will, by boosting low/mid range torque.
It is no concidence that when Buell adapted the Sportster engines and used a 2-into-1 with equal length pipes, they were able to significantly increase CR and use wilder cam profiles to greatly increase performance. The current touring exhaust system is an adaptation of that principle, to boost torque, which the softails and dynas do not currently use.
Thread
Thread Starter
Forum
Replies
Last Post
tda69
General Harley Davidson Chat
50
Jul 20, 2011 12:11 PM
