Lunati may be a new name in the mouths of the American V-twin market, but it is no stranger to creating parts that generate good engine performance. With a fresh line of camshaft applications available to fit most any Twin Cam Harley-Davidson from ’99 on up, we thought the time was ripe to take a closer look at the company’s offerings and put them to the test. Starting with an extremely low mileage ’04 Fat Boy still sporting its Stage 1 intake and exhaust additions and 88ci displacement, the decision was made to keep the modifications similar to what many would do to their own bikes. This install was designed to best showcase what the parts would do for you and is not about making the most power as possible from the package.
With that in mind we managed to stay rational and chose a pair of Lunati’s camshafts ($265.99) that top out at .510 inches of lift with the stock rockers and did not require changing the valve springs. A matching four-pack of hydraulic roller lifters ($14.99 ea.) was ordered to go along with the new bumpsticks. Knowing the added stresses on the original cast cam plate can get quite high with larger camshafts, we placed a call to Feuling for one of its much stronger 7075 billet cam plates ($399) to support the additional power. A HP+ oil pump ($425) from Feuling should give us a solid rise in oil pressure and oil return scavenging to keep the rotating parts alive for a long time to come. Additionally, Feuling supplied us with a set of adjustable pushrods ($239), saving us the added labor time of pulling the fuel tank and disassembling the rockers. Our Fat Boy guinea pig was an EFI-controlled machine so Dynojet’s Power Vision was chosen to program the Harley’s ECM with the correct information on fuel and timing for the new power combination.
In the capable hands of Clarke and Dustin Dunlap at F’NA Cycle and Performance in San Bernardino, California, our H-D was transformed into a much more potent riding machine. Hills, passengers, freeway passing, and stoplight action was much improved and tickets were easily just a twist of the wrist away. Before tearing into the Fat Boy with its open air cleaner, Vance & Hines Pro Pipe fit with a competition baffle, and a factory Stage 1 EFI download, the bike managed to put down a respectable 72.1 horsepower and 77.5 lb-ft of torque as a baseline. With the Lunati cams and a custom tune from Patrick Daniels at Dynojet, those numbers rose to 79.8 horsepower and 84.5 lb-ft of torque. That was a step up of 10.7 percent horsepower and 9.1 percent torque with similar increases across the spectrum. Those numbers were about what we expected and made a difference in the bike’s feel when the throttle gets rolled open. HB
Anaheim-Fullerton Harley Davidson
harleyfullerton.com | (714) 871-6563
colonymachine.com | (330) 225-3410
dynojet.com | (702) 399-1423
feulingparts.com | (866) 966-9767
F’NA Cycle and Performance
fnacycle.com | (909) 386-7366
lunatipower.com | (662) 892-1500