TODA Racing campulleys allow precise adjustment of camshaft timing. For added accuracy and longevity, the timing marks are machined into the metal, not painted on or silk screened. The campulleys also feature the most accurate timing adjustment system on the market. They are constructed from 7075 aluminum for optimum strength and light weight.
Differing from conventional sintered pulleys (one piece),the TODA adjustable campulley is made in two pieces. This enables the adjustment in the valve timing to be carried out. Since vernier type graduations are used, the adjustment can be carried to 1 deg of the crank angle (0.5 deg of the cam angle) in order to achieve maximum results.
Duralumin A-7075 is used for both its lightness and high rigidity in both the inner plate and the campulley. So implementing an improved design and the employment of Duralumin a 35% weight reduction is achieved. And not only is the overall weight reduced but also a reduction in inertia, leading to an improvement in engine response.
With employing Duralumin A-7075 in both sections of the pulley, the overall rigidity is improved. So whether you are using a standard camshaft or a high performance camshaft, valve timing accuracy is improved. The two pieces of the campulley are then anodized helping to prevent the lock bolts from sinking, along with surface treatments (precious metals) to help reduce cam belt wear.
Advancing = +
Intake valve opens sooner
Increases low-end torque range
Intake valve to piston clearance decreases
Exaust valve to piston clearance Increases
Retarding = -
Intake valve opens later
Increases high-end torque range
Intake valve to piston clearance increases
Exhaust valve to piston clearance decreases
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