Hot Cams: cam timing and valve clearance adjustment

Hot Cams specializes in camshafts and valvetrain components. Its camshaft development combines design using dedicated software with testing on a dynamometer. Its catalogue includes camshafts, timing chains, valve shims, valves and installation tools. This specialization covers both choosing a cam profile and maintaining and checking the components that control valve opening. Each part number must be selected for the specific engine and configuration.

At Motárea you can explore four product families: camshafts and timing chains, valve clearance shims, engine valves and cam timing tools. These links distinguish components that change valve actuation from parts used for adjustment, repair and measurement. Before choosing, check the part’s function and the contents supplied: an individual camshaft, an intake and exhaust set and a tool kit are intended for different jobs.

Stage camshafts and timing chains

The camshaft range uses different Stage designations. Stage 1 targets low-rpm torque, Stage 2 the mid-to-high rpm range and Stage 3 power at the upper end of the rev range. These are general directions from the brand, not a promise of identical results for every engine. Always check the exact Stage, intake or exhaust position and part-specific instructions before choosing the profile.

Your choice must also account for the other installed components. Check the instructions concerning springs, the piston and possible engine modifications, without applying one camshaft’s requirements to the whole range. For timing chains, check the specified chain type, pitch and link count. The condition of guides, sprockets and the tensioner is part of the assembly inspection; a new chain does not replace that check.

Valve shims and engine valves

Valve shims allow clearance adjustment in systems that use this type of calibrated component. The brand offers assorted kits and refill packs, with diameters such as 7.48, 8.9, 9.48, 10 and 13 mm depending on the part number. Diameter and thickness serve different purposes: the diameter must match the recess, while thickness is determined from the measurement and the engine’s procedure. Confirm both values and the sales presentation stated on the product page.

The engine valve range includes intake and exhaust part numbers, with steel or titanium options depending on the application. Position, dimensions, material and seat must match the intended assembly. Also check the relationship with guides, stem seals, springs and retaining components. A similar photograph does not establish that two valves are interchangeable or allow one material to be substituted for another without checking the technical instructions.

Tools for checking cam timing

The camshaft installation kit brings together tools for checking timing: a degree wheel, metric dial indicator, magnetic base and piston stops, presented in a wooden case with foam. These instruments relate displacement measurements to the engine’s angular position. Before choosing the kit, check the supplied contents and the mounting and access arrangements required for the job.

Consistent preparation starts by identifying the engine, part number and purpose of the work. Consult the application documentation for clearances, tolerances, tightening torques and the sequence of checks. Distinguish a cam profile change, clearance adjustment and repair of a worn component: they may share a working area, but each operation requires its own parts, measurements and installation conditions.