What in the heck is high tech about an air cleaner cover?...Surprisingly a lot! I cut up my stock filter cover that blocked off the filter element to all the incoming cooler air and was directing all the hot air that was radiating off of the cylinders right back into the motor. Guess what, I gained three horsepower on the dyno! Simply by letting the engine get the full effect of the incoming cooler air as you are riding gives you a free ram air system so I call the covers "Rammer". Being a machinist I put a full radius in the part to help things out and to give the cleaner a smooth beautiful appearance. Some people don't believe so simple an item that is so pretty can make horsepower so I dug around looking for something in print to back up my own experiences and found the below clipping (see bottom of page). Dyno testing has proved that Dewey's Rammer really works!
Dyno Proven by Hot Rod Bikes Magazine
Using a Twin Cam 88 Softail on a Dyno Jet 250 Dynamometer HOT ROD BIKES Magazine compared the stock factory air cleaner with a Dewey's Custom Rammer Billet air cleaner with the K&N Screaming Eagle filter element. The results were astounding!
FLSTC Stock v. Dewey's Rammer
| RPM | HP(stock) | TORQUE (Stock) | HP (Dewey's Rammer) | TORQUE (Dewey's Rammer) | % Torque/ Horsepower Change |
| 2000 | 25.1 | 65.9 | 25.7 | 67.5 | +2.4 % |
| 2250 | 29.3 | 68.3 | 29.8 | 69.5 | +1.8% |
| 2500 | 33.4 | 70.1 | 34.4 | 72.4 | +3.3 % |
| 2750 | 37.4 | 71.4 | 38.5 | 73.6 | +3.1 % |
| 3000 | 41.0 | 71.7 | 42.4 | 74.3 | +3.6 % |
| 3250 | 44.4 | 71.7 | 46.6 | 75.2 | +4.9 % |
| 3500 | 47.7 | 71.5 | 50.1 | 75.2 | +5.2 % |
| 3750 | 50.3 | 70.4 | 53.9 | 75.5 | +7.2 % |
| 4000 | 52.2 | 68.5 | 57.1 | 75.0 | +9.5% |
| 4250 | 54.1 | 66.8 | 60.0 | 74.2 | +11.1 % |
| 4500 | 55.1 | 64.3 | 62.2 | 72.6 | +12.9 % |
| 4750 | 55.6 | 61.5 | 63.3 | 70.0 | +13.8 % |
| 5000 | 56.1 | 59.0 | 63,8 | 67.0 | +13.6 % |
| 5250 | 55.9 | 55.9 | 63.8 | 63.8 | +14.1 % |
| 5500 | 54.5 | 52.1 | 62.7 | 59.9 | +15.0 % |
| Stock | Stock | Dewey's Rammer | Dewey's Rammer | Dewey's Rammer | |
| Average | 46.1 Hp | 65.9 Ft Lbs | 50.3 Hp | 71 Ft Lbs | 7.7 % Av. Gain |
As you can see from the HOT ROD BIKES Dyno test, Dewey's Rammer gave an average of a 7.7% gain throughout the rpm range and gave an astounding 15% gain at 5500 rpm. This is about the cheapest horsepower gain you are ever going to find...and about the only horsepower gain you'll ever find from a show quality billet part! Dewey's Rammer works!
S&S Cycle
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