Callies now offers coated main and rod bearings. The dry film lubricant applies in-house by Callies is especially beneficial at cold start-up and during periods of marginal lubrication. Tri-Metal XP bearings by King are now available in addition to all popular ACL and Clevite bearings.
Bekaert teams up with Xceldyne Technologies to develop the Cavidur®HT exhaust valve coating Collaborating with customers is an important part of our business model. With technical support from Xceldyne Technologies, a leading manufacturer of titanium valves, we have developed Cavidur®HT, a DLC exhaust valve coating for use in racing applications.
JE Pistons has announced that their popular SRP Professional Piston Kits now include piston skirt coating at no extra charge. Every SRP Professional piston kit already includes several features used in top level professional racing engines such as lightweight forged side relief (FSR) forgings, high quality wrist pins and precision CNC machined ring grooves. [...]
DIAMOND’S TYPE 3 HARD-COAT ANODIZED PISTONS ARE CRITICAL FOR ENGINES WITH POWER ADDERS—STREET ENGINES IN PARTICULAR Imagine the surreal heat and cylinder pressure generated by a Top Fuel engine on a 1000-foot pass. Though the violence to the pistons isn’t as concentrated inside a street engine with a power adder, it is constant and [...]
A sample of titanium valves in blank form. Stems have been machined to near-final diameter and the heads are rough formed, prior to CNC machining. Photo courtesy Xceldyne A variety of specialty coatings can be applied to valves to enhance specific properties such as lubricity, resistance to wear and thermal performance. Photo courtesy Xceldyne A [...]
SODIUM-FILLED VALVES Sodium-filled valves feature stems that are precision-gun-drilled and filled with a specially formulated sodium. This achieves weight reduction (the result of the gun-drilling to create a hollow stem) and better heat dispersion. There is some debate concerning the efficiency of this heat transfer due to concerns that the heat transfer to the guides [...]
Both rod and main bearings must feature a specified amount of crush area in order to achieve bearing lock-in within the housing. The bearing shell outer edges (approaching the parting line areas) are larger than the saddle, which adds to the lock-in placement of the bearing shells. Dirt particles or embedded blasting shot left behind [...]
CLEARANCES VS. CAVITATION EROSION Cavitation erosion of a bearing occurs when rapid movement of the shaft away from the bearing surface causes vapor bubbles to form in the oil film. When these bubbles break, the resulting force causes erosion of the bearing soft overlay layer. Appearance and location of cavitation erosion will differ with operating [...]
ANTI-FRICTION AND OIL MANAGEMENT COATINGS Anti-friction coatings (which would be applied to components such as bearings and piston skirts) not only provide a much lower coefficient of friction (when and if physical contact between two moving surfaces takes place), but also serve to retain surface oil between moving parts, which is exactly what you’d want [...]
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