The ever advancing technology in all industries have also generated better products to cope up with the requirements and the competition. Just like any other product, the gasket technician is often faced with a dizzying array of gasket technologies. The difference in gasket technologies among a ‘50s-model pickup truck, a ‘60s-vintage, high-compression muscle car and a modern bi-metal or aluminum engine is often quite pronounced.
Newage Gaskets, Industrial Gaskets Manufacturers and Suppliers in India equip you with the relevant gasket based on your temperature, pressure conditions making it relevant for your business requirement. We are very well stocked with all the raw material and are authorised product suppliers of premium companies like Klinger, Champion and Frenzelit, Germany.
Let’s see the conflict between engine gasket technologies over the eras.
Gasket Technology in 1950’s
Oil pan and tappet cover gaskets were known of this era. These were stamped from compressed cork and held in place by tying the gasket in place with sewing thread or by gluing the gasket to the metal surface with commercial gasket shellac.
Cylinder head gaskets used on all cast-iron engines were seen to be a composite design of asbestos or asbestos-substitute material wedged between two thin sheets of steel or copper fastened by a stainless steel fire ring crimped around the edge of the cylinder bore.
Valve cover gaskets that were made of thick cork required re-torquing the valve cover bolts once or twice per year to prevent oil leaks. Most of these early engines required periodic steam cleaning to remove engine grease caused by seeping valve cover, side, cover and oil pan gaskets.
Gasket Technology in 1960’s
During the 1960s, with the introduction of accessories like power steering and air conditioning, re-torquing cylinder head gaskets became less practical due to the lack of accessibility. This led to engineers designing a steel shim cylinder head gasket that required no re-torquing after the initial assembly and that would seal the high-compression engines of that era.
Chemical gaskets of the 1950s and 1960s were designed to seal minor surface imperfections and were of the hardening and non-hardening kinds.
Gasket Technology in 1980’s
With more emissions and accessory devices under the hood, underhood temperatures increased to more than 230 degrees F. The lack of airflow around the engine and the elevated temperatures required to activate electric cooling fans. This happened when “bi-metal” engines mating cast-iron cylinder blocks with aluminum cylinder heads were introduced and popularly accepted in the 1980s.
As temperatures increase, aluminum expands 1.5 times more than cast iron. Although the difference in thermal expansion coefficients of bi-metal engines is only a few thousandths of an inch, the cylinder head scrubbing over the cylinder eventually wears out the gasket and the cylinder head-mating surface. To reduce the effects of gasket scrub, a graphite-composite cylinder head gasket was designed that actually lubricates the cylinder head and cylinder block surfaces.
Current Gasket Technology
To keep up to the demands of increased underhood temperatures, engineers have designed a new generation of gasket sealing technology. The latest cylinder head gaskets are of a multi-layer steel (MLS) design that incorporates a number of thin steel shims held together by rivets at the corners. These combat gasket crush and scrubbing issues with bi-metal engines avoiding leaking of combustion gases into the cooling system.
Graphite corrugated gaskets and silicone rubber o-rings are used to compensate for thermal expansion differentials between intake manifolds and cylinder heads.
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