Have you seen?
Have you seen?
(OP)
I had been contemplating the limiting factor for the modern internal combustion engine and came to the conclusion that it is the valve design. Then I started to sketch out a rotating barstock system with ports cut into it and looked around on the net for similar ideas.
Has anyone else looked at the Coates engine (www.coatesengine.com)? It looks quite promising but they are not producing for the public - especially my old Pontiac.
Has anyone else looked at the Coates engine (www.coatesengine.com)? It looks quite promising but they are not producing for the public - especially my old Pontiac.





RE: Have you seen?
Few sealing materials would work and allow the rotating bar to continue to rotate.
Also variable valve timing would go away, until the ports and passages could be designed to change geometry w/ RPM.
RE: Have you seen?
RE: Have you seen?
I must agree, and the solution is in cylinder turbulence, early transition to turbulent flame with the resulting flame intensity. This combined with modern combustion chamber designs will produce minimal burn durations resulting in less negative work and little heat loss to the piston and head.
RE: Have you seen?
A search may throw up a lot of discussion.
Regards
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RE: Have you seen?
I know that it seems too good to be true but there must be some plausibility to the design - he has secured a contract on large truck engines and is selling them on bikes. Maybe the pros are overstated and the cons understated but I would like to see one myself or maybe just an independent test.
Don't get me wrong, I am not sold on it but am intrigued.
RE: Have you seen?
But then again turbocharged engines can generate plenty of power with poppet valves: Here's a video of a 'family sedan' with a turbocharged 2.0 l engine that only needs 8.95 seconds on a 1/4" mile.
http://med
(Not sure about power levels of this engine, but it might be over 1000 hp. Is this not sufficient?).
RE: Have you seen?
(And thats what can be doen by consumers, In WRC trim these 2.0l 4-cyl turbo motors are making ~600ft-lbs at 1500rpm and by 7000rpm are HP restricted by a 34mm (or thereabouts) restrictor plate to limit them to 300hp.)
With pneumatic poppets or e-mag poppets dont F1 motors rev to like 16,000 rpm?
I just have to agree that poppet valves are not the limiting factor here. Possibly the limiting factor is the basic design of the SBC?
Nick
I love materials science!
RE: Have you seen?
RE: Have you seen?
NickE, regarding the family sedan: Well, you have to admit that it has 4 doors and a trunk. :)
RE: Have you seen?
RE: Have you seen?
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Have you seen?
The information that did "leak out" is that they stopped the testing at 31,000 rpms. I have not seen any other details of the testing made public.
RE: Have you seen?
E.g. no carbon fiber rods or ceramic valves.
Also a high bore / stroke ratio leads to a combustion chamber with a large surface area where gases can cool down more rapidly and thus hurt torque.
RE: Have you seen?
Of course this would increase the possibility that one team finds an engine concept that is far superior as far as power density and efficiency goes. But to slow down a faster team they could simply add weight (as done in other race series).
This way our daily drivers might eventually benefit from these developments as well.
It is also interesting to see, that F1 teams of today consume 10 or 100 times more resources to develop a race car than 40 years ago. A race car, which for regulatory reasons is far less innovative than some of the race cars developed in the past.
RE: Have you seen?
...
money.
Mike Halloran
Pembroke Pines, FL, USA
RE: Have you seen?
It is only a question of where you set your priorities. If innovation goes up, predictability and reliability will go down. So what? An F1 car is not an airliner, instead of 1 smoking engine we would simply see 10 per race. I just don't believe that people would stop watching it, simply because there are more smoking engines.
F1 is supposed to high risk and action. However, F1 regulations start to generate a higher predictability level than regulations of a retirement home.
And I don't say they should reduce safety, I just say they should allow more innovation particulary in the engine department where it might help generating more efficient engines after all.
RE: Have you seen?
The cars are more expensive now because there is more money available. A racing team will always spend 105% of its budget.
Cheers
Greg Locock
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RE: Have you seen?
Now you can argue that the turbo-charger was invented 1905, but it didn't start to become widely popular on road cars before it was extensively applied in racing.
This huge F1 budget is now used to do a lot of detail work, for instance to work on the various little fins to guide air on a particular part of a chassis, which is generation of data that has mainly value for this particular chassis but very little for anything else, sometimes not even for the next years chassis.
Also, I'm mainly critizing F1. Not all racing series are like this, as Audi showed with its first Diesel powered race car winning LeMans.
RE: Have you seen?
Yes, I'd allow the turbo and possibly sporting 4wd, as succesful transplants from racing into road cars. That was what, 30 years ago? Since then nothing of any interest.
Motor racing is primarily a business, not a Petri dish for experimentation.
Cheers
Greg Locock
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RE: Have you seen?
I still think that knowledge flows from motor racing to road cars, just not in the form of invention, and only as a fairly intangible trickle.
I think Honda learnt some fuel efficiency tricks from the days of fuel quantity limited turbo engine F1 days.
I wish I could remember the details
Regards
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Have you seen?
It is possible to combine business and a high grade of innovation, but they're obviously not willing to take the risk.
Also, for instance, some wind tunnels of F1 teams are running 24/6 or 24/7. So they're possibly experiminenting more than ever but just not on new concepts.
It's also interesting to see that 25+ years ago they had fewer people and didn't have all these sophisticated 3D CAD/CAM and rapid prototyping tools and still generated quite a variety of designs in short order.
RE: Have you seen?