A Promising Evolution in Engine Design - The Coates Spherical Rotary Valve

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On this channel we love engines and anything that can further engine technology. Now the other day as I was reading thru articles I came across this really interesting new tech that is supposed to replace your conventional poppet valves with a new Spherical Rotary valve train. Now if videos like this peak your interest you why don’t you sub, its free, and if you later decide you don’t like me you can always unsub. Also watch this video till the end, because at the end there is a little twist.
Anyways Before we get into this new technology lets first talk about conventional engines, how they work and how we got here.
Over the years Engines have undergone remarkable advancements, with the valvetrain playing a critical role in power generation. Conventional engines utilize poppet valves and cams to control airflow and combustion within the cylinders. So how it works in most engines is the poppet valves act as the primary means of controlling the intake and exhaust processes. These valves are opened and closed by camshafts, which are synchronized to the engine's rotation and controlled by a timing belt or chain. The camshafts have lobes that press against the valve stems, lifting them from their seats to allow the intake or exhaust gases to enter or exit the combustion chamber. This synchronized action, coordinated with the engine's rotation, ensures precise timing and optimal performance.
But they aren’t perfect, you see Although conventional valve trains have served the automotive industry well, they have inherent limitations that restrict their performance potential. These limitations include airflow restrictions, limited valve lift and duration, and high operating temperatures. As a result, conventional engines face challenges in achieving high compression ratios and maximizing efficiency.
However, the Coates Spherical Rotary Valve Engine represents a groundbreaking leap forward in valving systems, boasting unparalleled breathing capabilities and efficiency. You see This advanced engine utilizes a unique valving system based on two spherical rotary valves mounted on separate shafts—one for the inlet and one for the exhaust.
Now One of the most striking advantages of the Coates Spherical Rotary Valve Engine is its exceptional breathing capabilities. Comparative tests have demonstrated that the engine can achieve nearly double the airflow of a conventional poppet valve engine. For instance, a five-litre poppet valve engine recorded a reading of 133 cubic feet per minute (CFM) when fully opened, while the Coates Spherical Rotary Valve Engine of the same displacement achieved a reading of 319 CFMs—an extraordinary advantage in airflow performance. And remember with engines the more air you have the more power you can make, that’s why forced induction is a thing.
So how exactly does this thing work? Well the Coates Spherical Rotary Valve Engine operates under distinct parameters that contribute to its superior efficiency. The valves rotate away from the combustion chamber, venting and charging on the opposite side of each sphere. This design also effectively lowers the combustion chamber temperature, enabling the use of higher compression ratios. Compression ratios of 12:1, 13:1, 14:1, and 15:1 have been achieved, depending on the application, further enhancing the engine's efficiency.
Now you might wonder, how does this thing seal, and also what stops it from wearing? Well the spherical rotary valves operate on ceramic carbon bearings, eliminating the need for oil lubrication. They do not make contact with any part of the housing, thereby minimizing friction and wear. The valves are equipped with floating-type ceramic seals and two piston rings, housed in small cylinder-type chambers. Activated by the compression and combustion strokes, these seals ensure 100 percent sealing effectiveness when compressed, promoting optimal combustion efficiency.
Now all this adds up to better performance out of your engine, you see The Coates Spherical Rotary Valve Engine's exceptional design and unique operating parameters result in extraordinary performance figures. Comparative tests conducted on a dynomometer have shown significant advantages over conventional engines. A five-litre ford small block poppet valve engine, operating under the same loads and conditions, produced 260hp and 249 ft ibs of torque on the dyno at 5500 RPMs. In contrast, the Coates Spherical Rotary Valve Engine reached an astounding 480 BHP and 454 foot-pounds of torque, Furthermore, according to the company them selves the lack of valvetrain limitations allowed the engine to spin all the way up to 14,750 rpm.

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