Now this...

[Jay 02 TA ws6]

... THIS is COOL...

http://www.coatesengine.com/csrv.html

Wow, this sounds like a HUGE advancement... even OHC with rockers and valves are obsolete.

[Jay 02 TA ws6]

"The Coates Spherical Rotary Valve Engine is the most advanced in the world, with the most positive valving system ever built. The breathing capabilities of the system are almost double that of a poppet valve. For instance: a static test of a five-litre poppet valve engine on an airflow machine produced a reading of 133 cubic feet per minute (CFM) with valve fully opened. The five-litre Coates Spherical Rotary Valve Engine on the same machine, however, produced a reading of 319 CFMs fully opened; a colossal advantage in airflow comparison. A five-litre poppet vavle engine tested on a dynomometer made 265bhp. Under the same loads and conditions at 5500, the CSRV five-litre produced 480 BHP and 454 foot pounds of torque. The maximum RPMs on the poppet valve engine were 5700 RPMs; the Spherical Rotary Valve Engine in comparison reached 14,850 RPM's, The Coates Spherical Rotary Valve comprises two spherical rotary valves assembled on two separate shafts - one for inlet and one for exhaust. They rotate on ceramic carbon bearing with no oil lubrication, the spheres do not make contact with any part of the housing. The seals are a floating type and are also made of a ceramic material. They have two piston rings and are floating in a small cylinder-type chamber, they are activated by the compression and the combustion strokes of the engine which allows 100 percent sealing effectiveness, when compressed.

Because the valves rotate away from the combustion chamber and are vented and charged on the opposite side of each sphere, this creates a lower combustion chamber temperature, allowing for higher compression ratios to be used thus creating an extremely efficient engine. Some of the Coates Spherical Rotary Combustion Engines are at 12 to 1, 13 to 1, 14 to 1 and 15 to 1 compression ratios depending on the application."

Why isn't this stuff mainstream?????????

[TraceZ]

It looks so simple. I have to wonder why nobody has thought of it until now.

[Gary94Formula]

I agree... Why aren't they using this type of system?

[FroSSty]

Hmmm...They list all the pros but how about the cons? Its definately an interesting developement.

[fastTa]

Indy cars have been using pneumatic springs actuated by hydraulics for a while now. There has been lots of talk of electromagnetic and electrohydraulic valvetrains as well. There is alot of interesting discussion of these in the Advanced Tech over on ls1tech.

Ducati even has their desmodromic setup. I think Mercedes also put it in the '55 SLR racing sports car. But, once they figured out that it took constant and tedious calibration, it lost it's claim to fame very quickly.

[fastTa]

It looks so simple. I have to wonder why nobody has thought of it until now.

The Coates Spherical Valve technology has been around for over 2 decades now. They just started to patent it in 1990.

[Jay 02 TA ws6]

Indy cars have been using pneumatic springs actuated by hydraulics for a while now. There has been lots of talk of electromagnetic and electrohydraulic valvetrains as well. There is alot of interesting discussion of these in the Advanced Tech over on ls1tech.

Ducati even has their desmodromic setup. I think Mercedes also put it in the '55 SLR racing sports car. But, once they figured out that it took constant and tedious calibration, it lost it's claim to fame very quickly.

Yeah, but it seems the Coates stuff is even better... no resistance from springs or rockers at all!!!!

[FRMLAV8]

And I really like the placement of the plugs and wires. That would be about a 10 minute job!!




Randy

[FroSSty]

hmmm...so this would do away with the ole bumpstick too... So to do a "cam" upgrade, you would have to change the two "cams" in each head? So change 4 cams instead of one? Or just the rotary valves? Strange...^^cool pic btw