Feasible to shut one rotor off for cruising?
#1
Feasible to shut one rotor off for cruising?
The technology has been tried before on piston engines. This fall, Honda will introduce an Accord Hybrid (with a supplementary electric assist motor) that will also have VCM (variable cylinder management), which will shut off one bank of three cylinders during hwy cruising to increase gas mileage.
Is it possible for the two-rotor Wankel to cruise on one rotor only? Could one rotor cruise efficiently and thus get greater mileage?
Is it possible for the two-rotor Wankel to cruise on one rotor only? Could one rotor cruise efficiently and thus get greater mileage?
#3
Gains are minimal. YTou have to figure that the now smaller engine has to work harder, using more gas. GM is gnning to use it in most of their vehicles soon, and projected savings are 15%. You can save much more than that by not driving so agressive.
#5
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Cadillac used to have a v4-6-8...horrible failure of an engine but the newer piston shut down technologies are supposed to be a vast improvement over the past. It seems like a neat idea but in the long run I wonder how much of it is really worth while in terms of fuel savings.
-Eric
-Eric
#6
Originally posted by Sue Esponte
Cadillac used to have a v4-6-8...horrible failure of an engine but the newer piston shut down technologies are supposed to be a vast improvement over the past. It seems like a neat idea but in the long run I wonder how much of it is really worth while in terms of fuel savings.
-Eric
Cadillac used to have a v4-6-8...horrible failure of an engine but the newer piston shut down technologies are supposed to be a vast improvement over the past. It seems like a neat idea but in the long run I wonder how much of it is really worth while in terms of fuel savings.
-Eric
#7
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The rotary engine works like a pump. It is constantly moving and sucking and blowing. I supose it could be done iwth indipendant throttle bodies, controld systems, and fuel systems for each rotor, but not as it stands now.
I would also argue that this would increase wear on the rotor that is shut off and not allow the engine to balance itself properly while running.
I would also argue that this would increase wear on the rotor that is shut off and not allow the engine to balance itself properly while running.
#8
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Wouldn't the engine need two separate e shafts that are independent of the other for that to even be a possibility.
Last edited by Senseny; 05-11-2004 at 10:22 AM.
#10
Ricer is Nicer.....
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Like Gigolo Jason says the rotary is basically a pump, if you shut off fuel and spark, it would still be using energy 'pumping'. If you shut the throttles, it would get worse, trying to pump a vacuum.
The piston versions worked by leaving the valves shut all the time, causing an 'air-spring effect'. The piston would compress the air, then be pushed down by it, with little net loss.
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doc
The piston versions worked by leaving the valves shut all the time, causing an 'air-spring effect'. The piston would compress the air, then be pushed down by it, with little net loss.
.
.
.
doc
#11
Originally posted by waldo
Gains are minimal. YTou have to figure that the now smaller engine has to work harder, using more gas. GM is gnning to use it in most of their vehicles soon, and projected savings are 15%. You can save much more than that by not driving so agressive.
Gains are minimal. YTou have to figure that the now smaller engine has to work harder, using more gas. GM is gnning to use it in most of their vehicles soon, and projected savings are 15%. You can save much more than that by not driving so agressive.
See this article
http://www.caranddriver.com/article....&page_number=1
#12
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Re: No gain....
Originally posted by Doctorr
...
The piston versions worked by leaving the valves shut all the time, causing an 'air-spring effect'. The piston would compress the air, then be pushed down by it, with little net loss.
.
.
.
doc
...
The piston versions worked by leaving the valves shut all the time, causing an 'air-spring effect'. The piston would compress the air, then be pushed down by it, with little net loss.
.
.
.
doc
#14
Administrator
we had this discussion some time ago in this thread and as mentioned- you dont need to shut off one whole rotor just skip a cycle per rotor. but this question on our urging was also put to Mazda by rotarynews.com and they answered "No". i think they are working more towards hybrid and hydrogen to increase fuel economy and decrease emissions
#16
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Originally posted by ricks8
Actually, Internal Combustion Engines are most efficient when operating at full throttle. Sounds counterintuitive, but thats why a flogged econbox gets better milage then a muscle care limped along.
Actually, Internal Combustion Engines are most efficient when operating at full throttle. Sounds counterintuitive, but thats why a flogged econbox gets better milage then a muscle care limped along.
Originally posted by 88gt
No it's not feasible. The e-shaft won't allow it.
No it's not feasible. The e-shaft won't allow it.
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