Comp Cams New Hi Performance Conical Valve Springs

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Expected to become the new standard in high performance valve spring design, COMP Cams® Conical Valve Springs (available thru Marken Performance) utilize round wire and feature a diameter and progressive pitch driven natural frequency designed to increase the valve train RPM limit while reducing resonance concerns and decreasing dynamic spring oscillations. The result is longer spring life and the ability to run more aggressive camshafts. A breakthrough in valve spring development, COMP Cams® is the very first to introduce this advanced conical design.

The reduced oscillation in the Conical Springs translates to less applied force and stress to the springs. This increases the lifespan of the spring and the valve train. It also allows the use of more aggressive camshaft profiles.

Short duration cams are often difficult to control. This is absolutely true, especially if the cam is combined with a more aggressive rocker ratio. As an example, a test on a mild 355c.i. small-block Chevy where we added a set of 1.6:1 rockers to a hydraulic roller cam with 220-degrees at 0.050 inch. At 4,900 rpm and above, the torque curve loses power rather abruptly. The second test showed the improvement in power when we returned to the 1.5:1 rocker arms. The difference in power was 10-12 hp. This is called valve float, but the effect that causes the power loss is not the common assumption that the lifter launches off the nose of the lobe. It’s better to think of valve float as loss of control which occurs when the valve closes, contacts the seat, and then bounces due to high-speed inertial forces. At high rpm, a weak seat pressure cannot always prevent the valve from bouncing. When this occurs, the valve opens while pressure is building in the cylinder. This pressure is lost back into the intake manifold, and power drops precipitously. Essentially what happened in that test was the valve spring was no longer capable of controlling the valve. A solution would have been to change the valve springs to try and solve the loss of control, and this is where Conical Springs excel. From: Article

Reducing the weight of the retainer is a great way to help valve springs exercise control over the valve. A simple upgrade to a beehive or conical spring is an excellent way to accomplish this. A retainer for conical springs weighs only 8 grams, while the larger diameter steel retainer for a dual spring weighs 28 grams — 3.5 times as much. Lighter and stronger is always better. Weight on the lifter and pushrod side isn’t nearly as critical as it is on the valve side. A little spring pressure can go a long way, especially if it is accompanied by a decrease in weight or mass.

Conical Springs Benefits:

• Progressive frequency increases RPM limit & creates ability to run more aggressive camshafts

• Constantly decreasing diameter from bottom to top reduces active mass & decreases applied forces – result is longer valve train component life & less parasitic horsepower loss

• Reduced mass improves RPM stability

• Conical design is the best natural frequency damping setup – dampens without wear, heat/friction or risk from interference contact

• Superfinish surface processing increases both lift capability and spring longevity

Stock 2015 Coyote camshafts measure .512-inch lift on both intake and exhaust valves, with 211 degrees of duration at .050-inch lift. These new cams thru Comp Cams start comparably with 227 degrees. The valve spring upgrade from the factory in the 2015-16 Coyote engine has allowed Comp Cams to develop camshaft profiles that are specific to these model years, increasing performance capability without any other changes. There are currently five CY-r Series camshafts from Comp available for the 2015-16 engine. Each grind is specifically tailored to different types of power increases – there are upgrades from stock (PN 243420) all the way through max-effort street-strip blower cams (PN 243480). The 2015-16 camshafts, unlike earlier years, do not require the use of camshaft phaser limiters. 3 grinds are available for naturally aspirated engines with 2 designed specifically for blower applications. All are no-springs-required for easily installation in the vehicle. However, two spring kits (part nos. 26113 and 26125) are available for those that would like more spring with high boost or who really want to push RPM limits.

LS Roller Rocker Video

COMP Cams® Short Travel Hydraulic Roller Lifters are engineered specifically to perform at higher engine speeds. When engines are equipped with a regular hydraulic lifter, high RPM is often limited by the improper position of the lifter's internal piston as the lifter inevitably "pumps up." This improper location results in open valves and therefore leads to lost power or even engine failure. Both the OE type Short Travel Hydraulic Lifters without link bars and retro-fit type lifters with link bars limit that internal movement to a minimum, which cuts down on these issues and allows higher engine RPMs. Part numbers listed below.

Comp Cams has received an award from the November 2016 SEMA show for Best New Performance Street Product for the SPR Radius Tip Rocker Arms. These are used in GM LS1 & LS3 engines. Available thru Marken Performance in needle bearing or bushed.

Attributes and Advantages:

• Improved dynamic stability, more durable, stiffer

• Direct bolt-on to OEM trunnion stands

• 30% greater stiffness than baseline OEM

• Minimizing rotational mass

• Coined nitride tip reduces friction

• Increased ratio of 1.77 for more lift

• F1 & Nascar design influence