This is what Ron sent me. Just got back from Orlando, Florida. EFI school (95 to 01).
The attached pic. is with my S2 Buell with a Trock CV. The airhorn is a S&S “D” mounted to a adapter I made. The adapter has the same taper as the airhorn. Which dictates the thickness of the adapter bracket.
With the Trock carb, airhorn. Last year it pulled 98 hp on the “Wheel”. I used 883 modified Tilley heads, S.E. Hi Perf. cams, and Buell Thunderstorm pistons (10.3 C/R). My goal was 100 H.P. I came real close.
With a Trock 45mm CV, S.E. 1.900 Dia. intake valves and bumping the C/R up to 11-to-1 I’ll be there. Need to work more on the heads. Will be using Wiseco domed forged piston’s this time around also.
TROCKERIZING THE CVH CARBURETOR
By Ron Trock
The stock CVH carburetor as used on the late model Harleys is a simple and straightforward design, yet sophisticated in its manufacture. The vacuum operated slide will give the engine a uniform delivery of fuel/air mixture over a broad range of RPM and altitude.
Unfortunately some features of the carb had to be compromised to satisty EPA and DOT mandates.
At Trock Cycle no bells,whistles and/or snake oil are installed. Any maintenance components can be serviced by any qualified H-D shop worldwide. We strive for drivability and far better than stock performance with good gas mileage and dependability at an affordable price.
Boring the carb body to 41mm and matching the slide contour increases the potential flow by 8 to 10 CFM at wide open throttle. A smooth bore condition is created while maintaining laminar air flow through the venturi. This modification will satisfy a 90 to 100 cubic inch engine. If more is needed, as with some of the aftermarket engines, we can rework to a 44mm carburetor as well, or some customers install two carbs on a common manifold.
Upon reassembly we alter the jetting and accelerator pump as per customer needs. This is an advantage we have over O.E.M. We know what engine and bike, cams, compression, etc. and riding conditions the customer enjoys. Drivability is what we give our customer. Each carb is made to fit.
We provide this service to H-D dealers and any qualified independent shops as well as individuals with custom applications, such as Buells, road racing, flat track, trike, sidecar, superchargers, etc.
At Trock Cycle we have found that the CVH Carburetor [stock or 44mm] is a great retrofit on all the pre-Evolution Harleys as well. We have replaced all models/brands of the O.E.M. carbs as they wear out and become troublesome and many of the aftermarket carbs because they are difficult to tune and have a tendency to run too rich.
If the oil tank smells of gasoline there’s a problem. Cost is another factor. How many good carbs can be found at a swap meet, priced right. Our retrofit manifold adaptor/bracket kit makes this conversion very easy.
Note the fitting plate for the choke knob. This allows the carb to be mounted on any bike without hunting for a place to run the choke, besides it’s clean and out of the way.
In the near future we will show how to use Trock’s CV inlet tool for replacing the fragil, leaky inlet spout.
Trock Cycle Specialties,
Hampshire, Illinois 60140
Ph: (847) 683-4010.
