Rx-8 Rotors On A N/a Fc
10-22-2003, 05:54 PM
#24
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Originally Posted by pinfield357' date='Oct 22 2003, 01:56 PM
you guys are crazy 
Im running ideas through me head...Renesis rotors, REW block with a hybrid side/PP(primary side ports for low rpm, pp opens up in the midrange), Guru 2 piece ecc shaft. 12K rpm anyone?
Oh, and I was reading about the rotors. Theyre dynamically balanced, and are front/rear specific. No wonder that engine revs so smoothly. All the 13B rotors are statically balanced, and are not front/rear specific.
10-23-2003, 12:35 AM
#26
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I sort of think its worth it
ive been bugging Robbomaz though pms about the 10:1 pport motor he was involved with for the last couple of days
im in the process of building a high comp turbo motor using s5 n/a rotors, if i get lucky on other parts ill stop searching for another n/a rotor and just buy some renisis
back to the topic however i say do it, it be nice to see how much of a power increase this would make
ive been bugging Robbomaz though pms about the 10:1 pport motor he was involved with for the last couple of days
im in the process of building a high comp turbo motor using s5 n/a rotors, if i get lucky on other parts ill stop searching for another n/a rotor and just buy some renisis
back to the topic however i say do it, it be nice to see how much of a power increase this would make
10-23-2003, 12:55 AM
#27
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Originally Posted by mazdaspeed7' date='Oct 23 2003, 01:01 AM
[quote name='RONIN FC' date='Oct 22 2003, 12:59 PM'] [quote name='Robbomaz' date='Oct 22 2003, 05:13 AM'] Well one racer here thinks any extra comp is worth chasing!
We just built a PP 13B for a Gen 1 racer using Renesis rotors. Renesis apex seals are not as deep and are much lighter as they don't have to cross any openings. We machined the apex groove to take std carbon race seals, used S5 corners & springs and left the oil ring 'shields' out as there is no heat to worry about in that area on a PP.
We just built a PP 13B for a Gen 1 racer using Renesis rotors. Renesis apex seals are not as deep and are much lighter as they don't have to cross any openings. We machined the apex groove to take std carbon race seals, used S5 corners & springs and left the oil ring 'shields' out as there is no heat to worry about in that area on a PP.
He milled the rotors because carbon seals arent available in renesis sizes. I wonder if the exhaust port would really cause a problem. [/quote]
I don't know how a Renesis seal would go on a peripheral exhaust. The Renesis seal is somewhat smaller in depth, but if it is not less than the minimum depth for the older style seal there may not be an issue. The tip profile where it contacts the rotor housing is more rounded from what I have heard. Only hypothesising as I haven't seen or micro'd a Renesis apex.
We machined the rotor to suit older steel seals originally, wanting to be sure we had no issues with the seals and peripheral ports. Client wanted a strong full-season+ package & opted for carbons late in the piece (found some more spare cash I guess!)
10-23-2003, 09:54 AM
#28
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Originally Posted by Robbomaz' date='Oct 22 2003, 09:55 PM
[quote name='mazdaspeed7' date='Oct 23 2003, 01:01 AM'] [quote name='RONIN FC' date='Oct 22 2003, 12:59 PM'] [quote name='Robbomaz' date='Oct 22 2003, 05:13 AM'] Well one racer here thinks any extra comp is worth chasing!
We just built a PP 13B for a Gen 1 racer using Renesis rotors. Renesis apex seals are not as deep and are much lighter as they don't have to cross any openings. We machined the apex groove to take std carbon race seals, used S5 corners & springs and left the oil ring 'shields' out as there is no heat to worry about in that area on a PP.
We just built a PP 13B for a Gen 1 racer using Renesis rotors. Renesis apex seals are not as deep and are much lighter as they don't have to cross any openings. We machined the apex groove to take std carbon race seals, used S5 corners & springs and left the oil ring 'shields' out as there is no heat to worry about in that area on a PP.
He milled the rotors because carbon seals arent available in renesis sizes. I wonder if the exhaust port would really cause a problem. [/quote]
I don't know how a Renesis seal would go on a peripheral exhaust. The Renesis seal is somewhat smaller in depth, but if it is not less than the minimum depth for the older style seal there may not be an issue. The tip profile where it contacts the rotor housing is more rounded from what I have heard. Only hypothesising as I haven't seen or micro'd a Renesis apex.
We machined the rotor to suit older steel seals originally, wanting to be sure we had no issues with the seals and peripheral ports. Client wanted a strong full-season+ package & opted for carbons late in the piece (found some more spare cash I guess!) [/quote]
don't you think theoretically, that the seals not being designed to withstand the heat from a peripheral exhaust may fail? Not to mention the lack of support by the housing. Maybe they hold, maybe there harder but i would hold them suspect.
10-23-2003, 12:27 PM
#29
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The heat will be the same no matter where the exhaust port is.
I can see no problem with the seals, except possibly warping over time, but Im not an enginner, and i have no idea if or even when that would happen. Ill see if I can find some more info.
I can see no problem with the seals, except possibly warping over time, but Im not an enginner, and i have no idea if or even when that would happen. Ill see if I can find some more info.
10-23-2003, 06:30 PM
#30
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Location: Perth, Western Australia
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Ronin I don't think heat is so much the issue as the hole the seal has to cross. The seal can 'bow' slightly crossing the port, especially at high rpm. We are talking a tiny amount This is ONE of the reasons there is a minimum depth for apex seals.
Peripheral ports have a small ramp on the closing edge to 'pack' the seal back in. We have rebuilt engines for DIY porters that enlarged the port not considering this and **** a seal the first time they revved hard......
I see no issue with Renesis seals in engines with peripheral ports of any kind other than they will not last as long because they start off narrower. I am pretty sure the gas seal edge has been reshaped for better sealing on the housing, which may make them worth using. But as I said before, I haven't seen or used them yet
Someone Stateside will probably do it first!
Peripheral ports have a small ramp on the closing edge to 'pack' the seal back in. We have rebuilt engines for DIY porters that enlarged the port not considering this and **** a seal the first time they revved hard......
I see no issue with Renesis seals in engines with peripheral ports of any kind other than they will not last as long because they start off narrower. I am pretty sure the gas seal edge has been reshaped for better sealing on the housing, which may make them worth using. But as I said before, I haven't seen or used them yet
Someone Stateside will probably do it first!