“Ceramic Coatings provide excellent thermal barriers extending the life of your engine.”
Protective coatings can be applied to any engine component to extend the life of the product.
Most industrial performance coaters are just that, Coaters. Meaning, they apply a commercially available “acceptable & proven” formulation to customer components; then let the customer determine if their coating process is any good. If things go as planed, then everybody is happy. At Cradin Industries, Inc. we know exactly what works and what doesn’t! Let’s be candid, there are numerous “ceramic” coating formulations available from some engaging industrial chemical giants. But, how does a coating applicator actually determine which of the commercially available formulations are the best suited to specific customer requirements? We, at Cradin, accomplish this task by testing the subject coating on our high-load low-oscillation test rig. Next, we test coated components on our in-house Stuska Engine Dynamometer, and finally “track side” on our Tulu Racing 1990 Beretta 588 C.I. Big Chief powered drag racing car. At Cradin Industries, Inc. we know what works and what doesn’t…because we test and we test and then we test some more!
Understanding the basics and diversity of high performance coatings, which satisfy an extensive range of today’s engineered material design criteria; no single coating formulation, regardless of its manufacture, is capable of handling all of these diverse mechanical and chemical requirements. In that regard, let’s break it down into four fundamental coating categories; those being:
Corrosion & Chemical Resistance
Coating Individually Applied by Professionals
One of the obvious reasons for using a solid or dry film fluoropolymer lubrication coating is to reduce friction. A simple reduction in friction greatly reduces component interface contact wear, which in turn, frees up horsepower typically lost to friction. Well, what exactly is a fluoropolymer? Polytetrafluoroethylene (PTFE, generically known as teflon) has the lowest coefficient of friction of any known solid. For this single reason engineers for years have experimented using polymers as a solid lubricant on engine components in an effort to reduce friction. Again, because of the low coefficient of friction, PTFE (or polymer) powders are added to engine lubricants to reduce friction and wear between mating components. However, PTFE is extremely soft and expensive. Fluorocarbons are various chemically inert compounds containing both carbon and fluorine and are used mainly in lubricants and in the making of resins and plastics. Fluorocarbons are hard. When blending fluorocarbons with fine PTFE particles along with selected fillers, binders, and pigments you have a complex matrix formulation known as a fluoropolymer. A properly formulated fluoropolymer coating offers the known friction reducing characteristic of PTFE and fluorocarbons in conjunction with the wear characteristics of the specifically selected binders and fillers.
There are obvious critical areas associated with power loss and damage caused by inadequate lubrication. Two of the highest frictional contact surfaces in an internal combustion engine are design situated between the piston skirts and cylinder walls, and the interfacing contact area of the crankshaft journals and corresponding rod and main bearings. When introducing high velocity reciprocating movement, one can only hope that hydrodynamic (boundary) lubrication is occurring. Wait a minute, how about “cold starts” when all the oil has drained down off the piston skirts and departed the bearing surfaces…isn’t the engine literally operating dry! Reason enough for having components fluoropolymer coated. However, don’t ignore the Performance Enhancement benefits of fluoropolymer coatings designed to significantly diminish friction and freeing up wasted energy (horsepower)..
Gear type oil pumps (wet sumps) require extremely close internal tolerances to properly scavenge reserve oil from the pan and then force it through the engine’s oiling network. Consequently, during operation there is substantial friction taking place which is consuming an enormous amount of energy and is converting this energy into unwanted heat. Once again we have a “horsepower” thief that can be eliminated.
Thermal Barrier coating formulations of ceramic and metal compositions are intentionally designed to reduce or isolate the movement of heat. For example, exhaust system coatings have a primary goal of heat containment within individual components; which significantly reduces operational exterior surface temperature.
However, when dealing with a combustion chamber the ultimate objective is containment of combustion generated heat within the combustion chamber, rather than having this horsepower generating energy absorbed into neighboring metal surfaces.
Thermal Barrier Coatings
Properly controlled heat energy in a combustion chamber will substantially increase the downward force applied to a piston during the power stroke. Further, when the employ of alternative fuels or an increased combustion ratio is introduced a Thermal Barrier Coating will provide protection of components prone to failure; an example being piston top erosion caused by pre-detonation.
Chrome Thermal barrier coatings on exhaust
Black Thermal barrier coatings on
Thermal Dispersant is one of the most important, but totally neglected principals. Think about it, having the ability to transfer or control excessive operational temperature (heat). Everybody knows heat is a killer and is the ultimate factor found during metal fatigue, boiling fluids and destructive metal expansion; which correspondently introduces a multitude of other component catastrophic failures. Thermal dispersant coatings have the capability of transferring heat faster than a bare metal surface.
During Dyno and Track Side testing we realized our Thermal Dispersant coated engines, upon shut down, would momentarily maintain their registered operational temperature and then start to rapidly diminish. Usually, upon shut down, an uncoated engine will actually continue to increase in temperature.
Corrosion & Chemical Resistance
Corrosion and Chemical Resistance is a bona fide concern. The deteriorating effects of corrosion and chemical attack on environmentally exposed metal surfaces are obvious. Aluminum components, for example: an intake manifold can become useless if its water ports are excessively damaged by the result of erosion. How many times have you replaced aluminum thermostat housings? Some high performance coatings, by their mere composition, are multi-functional. Cradin performance coatings utilized individually or in combination are significantly advantageous toward component performance enhancement and operational durability.
Oil shedding is desirable for keeping oil off certain components that are prone to oil carbonization and the reduction of oil windage. By applying an oil shedding coating, one can reduce oil pickup of rotational components. Coating valve springs of the double or triple helical type can reduce frictional losses and breakage attributed to the inner and outer coils chafing. Frictional heat generation can be responsible for the de-tempering of springs. Coating valve stems considerably reduces wear of the rubber oil seals that sit on top of the valve guides; greatly prolonging their life and reducing oil leakage down the valve stems into the ports and combustion chambers. An extremely high load application is camshaft lobes; a coating containing high molybdenum disulfide content is desirable. During dyno testing, we have see wear of the coating on the up-side of the lobe ramp upon start up and after a few hours of run, but no further deterioration after. Although some may consider the coating “soft” for this application, benefits are gained by friction reduction and reduced wear.