There is something of a disposition among supercharger aficionados to situate all of their seat on increasing boost.
Instructions
1. End where you wish your power-band to be. Positive-displacement or "Roots-type" superchargers tend to constitute massive endowment at low rpm and taper off higher in the rpm compass; centrifugal superchargers (which are in truth honorable belt-driven turbos) functioning isolated in the rpm gamut.
While increasing energy in the intake manifold can shove and air into the cylinder, that air may beefy hardihood to away whether the engine itself is not locate up to accomodate the blower. After all, strength does not practise ability; burning air and fuel does. Picking the deserved cam for appliance with a supercharger or turbo comes down to ensuring that the dissipate gases can gratify absent of the Engine as efficiently as the pressurized air goes into the Engine.
2. Shop for a cam with also exhaust lift and career. This is fully maybe the most crucial Component of supercharger camshaft choice, by reason of the supercharger cannot push more air in if there is already exhaust gases in the cylinder. Most performance cams use more lift and duration on the intake side to pull more air in; you will want to utilize a cam with exhaust lift and duration at least ten percent higher than the intake.
3. Specify your cam with the wide lobe separation angle to ensure the lowest possible overlap. Overlap is the amount of time in degrees that the intake and exhaust valves are open at the same time, and excess amounts of it can work against your supercharger by allowing exhaust backpressure to negate supercharger pressure while the valves are open. Avoid any cam with more than 30-degrees of overlap.
4. Purchase a cam designed for use with roller-lifters. This is not a strict necessity; you could go with an old-school flat-tappet camshaft, but you are losing out on horsepower, torque and quite possibly fuel efficiency. A roller-tappet camshaft allows the valves to open and close quicker, which allows you to run a bit less lobe separation while keeping overlap to a minimum. A slightly lower (about one-degree) lobe-separation angle will increase cylinder pressure and low-rpm torque without adversely affecting the engine's octane tolerance or idle quality.
