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Horsepower By The Issue

Below is the Hot Rod's Bike Works magazine article Motorcycle Upgrades - Horsepower By The Issue read the article, browse photos from the article, or search related articles in the Automotive.com Enthusiast Central.
Motorcycle Upgrades - Horsepower By The Issue
Horsepower By Issue Twin Cam

Motorcycle Upgrades - Horsepower By The Issue

Our Favorite Hop-Ups

By Mark Masker, Billy Bartels

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In the 15 years HRH/HRB/BIKE-Works has been around, a lot of good people have done their absolute best to bring the readers informative performance enhancements for their motorcycles. This being the last issue, it's only right that we take a look back over the years at some of the highlights from all the bloody knuckles, dyno runs, and general fun we've had. Enjoy.

Note: Unless otherwise noted, all dyno data is based on averages between 1,500 and 6,000 rpm.

March 1994--The Smile Factor

Before
37.4 lbs-ft and 35.6 hp @ 5,000 rpm

After
77.8 lbs-ft and 74.1 hp @ 5000 rpm

Parts:

RevTech carb, camshaft, and ignition; SuperTrapp exhaust (MSRP n/a)Description: Erik Falconer and Frank Kaisler took a '90 California Softail and guinea pigged it with RevTech's Super Street Kit.

June 1999--Twin Cam Dresser Muffler Testing

Before
Stock - 50.3 hp/71.6 lbs-ft

After
Bartels' Performance 56.4 hp/77.6 lbs-ft
CCI Straight Cut Cones 56.4 hp/76.5 lbs-ft
Borla Carbon Fibers 56.7 hp/78.0 lbs-ft
Khrome Werks Tapered 55.8 hp/77.0 lbs-ft
Paughco Rocket Tips 55.0 hp/75.8 lbs-ft
White Bros E Series 56.3 hp/77.1 lbs-ft
Vance & Hines 55.5 hp/76.6 lbs-ft
Drag Specialties Ovals 55.9 hp/76.9 lbs-ft
Kerker 55.7 hp/76.7 lbs-ft
Samson Ovals 56.2 hp/77.5 lbs-ft
Cycle Shack Tapered 55.2 hp/76.2 lbs-ft
Cycle Shack Rocket Tips 55.4 hp/76.5 lbs-ft
Hooker Tuned Flow 56.4 hp/77.4 lbs-ft
BUB Megaphones 56.0 hp/77.2 lbs-ft
SuperTrapp Turnouts 55.5 hp/76.6 lbs-ft

Description: Although it didn't show dramatic power gains, this article was important because it marked our first round of Twin Cam pipe tests, the same year that motor first hit the market.

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