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RX8 Engine Emissions - Question

 
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Shrapnel



Joined: 20 Oct 2005
Posts: 16

PostPosted: Mon Oct 31, 2005 5:53 am    Post subject: RX8 Engine Emissions - Question Reply with quote

These words appear in this site's excellent article on the Renesis engine:

"The Renesis engine retains unburned hydrocarbons from one cycle for combustion in the next a process that vastly reduces emission of unburned gases in the exhaust"

My question is: how does this work? My study of the diagrams and animations seems to indicate that the exhaust just goes out of the chamber, into the exhaust pipes.
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Blake
Been there, done that


Joined: 12 Jul 2005
Posts: 135
Location: Portland, OR

PostPosted: Mon Oct 31, 2005 1:57 pm    Post subject: Re: RX8 Engine Emissions - Question Reply with quote

Shrapnel wrote:
These words appear in this site's excellent article on the Renesis engine:

"The Renesis engine retains unburned hydrocarbons from one cycle for combustion in the next a process that vastly reduces emission of unburned gases in the exhaust"

My question is: how does this work? My study of the diagrams and animations seems to indicate that the exhaust just goes out of the chamber, into the exhaust pipes.


The difference is that the RENESIS engine has side exhaust ports rather than peripheral. The unburned hydrocarbons hang out along the trailing apex seal, up against the rotor housing. With a peripheral exhaust, the hydrocarbons get swept out because the exhaust is in the rotor housing. With the side exhaust ports, the hydrocarbons get swept *past* the ports because the port is some distance away from the rotor housing. Think of it like sweeping sawdust into a dust pan, except now the dust pan is off the ground...the sawdust just goes under the pan to the other side. It's really just a clever form of EGR (Exhaust Gas Recirculation), except without all the complex emissions controls. The hydrocarbons go though the comustion cycle all over again and, hopefully, get combusted the second time around. Does that make sense?
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Shrapnel



Joined: 20 Oct 2005
Posts: 16

PostPosted: Mon Oct 31, 2005 8:47 pm    Post subject: Reply with quote

I'm getting there... I think. But is it the case that the unburned component of the exhaust is somehow separated from the burned component? Does the system manage to somehow expel the burned part, but retain the unburnt part (for re-cycling)? Why isn't the whole bundle of burnt and unburnt all mixed together? (Sorry if I'm being a dill).
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Tony Shrapnel
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Blake
Been there, done that


Joined: 12 Jul 2005
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Location: Portland, OR

PostPosted: Tue Nov 01, 2005 1:33 pm    Post subject: Reply with quote

Shrapnel wrote:
I'm getting there... I think. But is it the case that the unburned component of the exhaust is somehow separated from the burned component? Does the system manage to somehow expel the burned part, but retain the unburnt part (for re-cycling)? Why isn't the whole bundle of burnt and unburnt all mixed together? (Sorry if I'm being a dill).


The unburned mixture congregates along the trailing apex seal. It is there because the gas flow velocity in the chamber exceeds the propagation of the burn, which thus cannot go fully "upstream" to the trailing apex seal. The tailing plug helps the burn above the minor axis and the Wasted Spark leading firing is designed to help too, but nothing beats sending the unburned hydrocrbons for a second go-'round. Some certainly gets swept out regardless, but the majority gets whisked past the side exhaust ports where it would otherwise get dumped out a periphearal exhaust port. At least, that's the story and I'm sticking to it.
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Spider



Joined: 02 Oct 2005
Posts: 11

PostPosted: Sat Dec 10, 2005 3:32 am    Post subject: Reply with quote

I came across this article last night.

http://www.thecarricos.com/ACRE/Documents/renesis_paper.pdf

regards
Andrew
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