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RX7 Specialties (rotaryengine.com) CNC exhaust porting

Old 06-13-2018, 12:02 PM
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RX7 Specialties (rotaryengine.com) CNC exhaust porting

Looks much more precise than the die grinder porting I've seen.

Does this kind of porting actually advance exhaust timing though? It looks like the enlarged exhaust port (at the wide end) doesn't actually go all the way through, and "slopes" to avoid the water jacket so that the opening itself is not actually any larger (though perhaps flow is increased).

Last edited by Blue2010R3; 06-13-2018 at 12:07 PM.
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Old 06-13-2018, 01:01 PM
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Doesn't address the issue with the port-runner transition. May even make it worse.

Also, his explanation of the carbon nugget from the exhaust port shelf doesn't seem likely to me. If exhaust gasses are flowing out through the exhaust port, how does the carbon fall back into the chamber against the gas flow.
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Old 06-15-2018, 03:17 PM
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Yeah we'll have to see if they ever post dyno results.
The rotary community is simply awful at information sharing. I'm super curious how Rotary Innovations closed off its side exhaust ports on their funky dual-intake allegedly 271 flywheel hp semi-PP Renesis.
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Old 06-15-2018, 03:55 PM
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A meticulous build and proper tune of an unported Renesis can get you to 260. Doesn't sound like all their extra work has gotten them much.
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Old 06-25-2018, 04:39 PM
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Looks like quality work on the machining, but without the bare minimum of dyno results before and after porting (same irons, same hard seals), it is hard to consider it anything other than BS.
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Old 06-25-2018, 08:15 PM
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I have watched a bunch of their videos. All of their work appears to be top notch. if I ever get a hankering for more porting, I would definitively let them do the rough ins on some brand new sideplates
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Old 04-15-2019, 10:20 PM
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Unported Renesis engine:



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