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aluminum renesis rotors?
im not sure on this, but the sales guy at the mazda dealership told me that the new rotors are all aluminum. is that true? i heard him tell me that and was a little unsure. i had to help him out while talking to another customer about how it worked. he was very sure that the rotors are aluminum.
paul |
Interesting......
Did he say Aluminium or Alloy? coz theres a world of difference. |
That would make them damn light if they are all Al.
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wouldn't aluminum melt... thats what i thought
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Re: aluminum renesis rotors?
Originally posted by rotorbrain im not sure on this, but the sales guy at the mazda dealership told me that the new rotors are all aluminum. is that true? i heard him tell me that and was a little unsure. i had to help him out while talking to another customer about how it worked. he was very sure that the rotors are aluminum. paul |
thanks now. i figured he was wrong. he also said that the side housings were aluminum. . . this i know he was wrong on. i didnt believe that one bit. haha.
paul |
So what exactly is the reason alloy rotors would melt? Forged alloy pistons are regularly used in Honda engines. (ha ha, I am a honda owner too. :) ) Isn't the reason rotary exhaust gas temps are higher than piston temps is because rotaries don't burn the air/fuel as long and expel it out the exhaust earlier than a piston engine would? Piston engines run leaner, too, meaning higher actual combustion temps.
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Is there any news on if these rotors will swap into our cars?
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You'd have to watch the compression ratio using these rotors since the renesis is a higher compression engine.
Tim |
they are aluminum covered in hard chromium surface and there hollow inside (i read somewere thy are ten lbs. lighter)
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Originally posted by King_fish111 they are aluminum covered in hard chromium surface and there hollow inside (i read somewere thy are ten lbs. lighter) |
Originally posted by j9fd3s the previous rotors were like 9lbs, so shaving off 10lbs makes them very light indeed Maybe it was a 10lb savings overall? just a guess. If the new rotors are -1lb though I would stack them in my trunk untill the scale reads zero! ;) |
well, someone correct me
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see, they become -1 lbs because they melt
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has anyone ever had osmosium rotors? thats what i want to get.
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Are they made of unobtainium? ;)
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Originally posted by 88IntegraLS So what exactly is the reason alloy rotors would melt? Forged alloy pistons are regularly used in Honda engines. (ha ha, I am a honda owner too. :) ) Isn't the reason rotary exhaust gas temps are higher than piston temps is because rotaries don't burn the air/fuel as long and expel it out the exhaust earlier than a piston engine would? Piston engines run leaner, too, meaning higher actual combustion temps. |
All rotors are hollow, for what it's worth. Oil is sprayed into the rotors for cooling, via jets in the eccentric shaft.
God I *hope* the rotors are iron, and not aluminum. Iron expands much less than aluminum when heated. This is one advantage rotaries have over piston engines... you blow a hose and lose all coolant, you can keep going until you can safely shut off the engine. In a piston engine, you keep going until the pistons sieze in the bores. This isn't a big considertion for cars, maybe, but it's damned important in an airplane. And some people who've put rotaries in aircraft have suffered complete cooling system failure, and were able to continue flying until able to make a safe landing. That's the neat thing, overheat it and it'll keep running, until you shut it off. Then it won't start again :) |
Originally posted by peejay All rotors are hollow, for what it's worth. Oil is sprayed into the rotors for cooling, via jets in the eccentric shaft. God I *hope* the rotors are iron, and not aluminum. Iron expands much less than aluminum when heated. This is one advantage rotaries have over piston engines... you blow a hose and lose all coolant, you can keep going until you can safely shut off the engine. In a piston engine, you keep going until the pistons sieze in the bores. This isn't a big considertion for cars, maybe, but it's damned important in an airplane. And some people who've put rotaries in aircraft have suffered complete cooling system failure, and were able to continue flying until able to make a safe landing. That's the neat thing, overheat it and it'll keep running, until you shut it off. Then it won't start again :) mike |
there iron, just thinner then previous rotors, hollow and cast like previous rotors. I think there ~8.5 pounds, i think a tad lighter then racing beat super light weight rotors. Also i doubt a compression bump of .3 is going to matter enough to cause detonation(over s5 NT rotors) The rotors are the same dimensions as ours, just a lil higher compression, about a pound lighter, have shallower apex seal grooves(only renesis seals would work), thinner seal grooves (~1.9mm), and ive also heard reports of .5mm side seals, instead of .7. Also the rubber corner seal plugs look differnt (no "notch" for the seal beacause there shorter) and there are now 3 oil control rings, which also may be thinner(outer one is metal and used to protect the second oil control ring form being exposed to hot exaust gasses, and could possibly be ommited when swapping the rotors to a p- port exaust car. The only problem i see, is that the oil squirters may not squirt nto the rotor anymore because the rings moved in a tad(or did they just make them thinner and take up the same space?).
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The only problem i see, is that the oil squirters may not squirt nto the rotor anymore because the rings moved in a tad(or did they just make them thinner and take up the same space?). |
The third "oil control" ring is actually called a scraper. Protects the oil rings from exhaust heat, donchaknow.
BTW - something I've been meaning to ask, and this is as good a place as any: What is the engine's designation? Is it a 13C? 13B-MSP? (I *refuse* to call this thing a "Renesis", that is the lamest marketing-fabricated pseudoword *ever*) |
Vicuna is an animal who's fur is several shades of brown. It's also a marketing strategy for a new color from Chrysler some years back.
The rotor housings still say 13B on them. But no one knows if there are extra letters to let you know if it's got machined exhaust ports or not. Apearantly, it's really hard to see the raised '13B' on the housing under all that rat's nest. |
Well someone should put these into a FC NT engine, cuz Mazdatrix is selling the rotors for $287, but all the seals and such are a tad bit more expensive than our rotors.
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So let's just call it a "Series 9" engine. :) (Given that the RX8 is an "FE" chassis)
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The thermal efficiency of the rotary is bad enough with Iron rotors, with aluminium, it would be even worse, Look at the size of an Rx-7 radiator compared to that of any other small 4 banger, then consider what size it would be if even it had to deal with 10% more heat..The only way around it would be a thermal resistant coating on the face and sides of the rotor..Max
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The RX-8 rotors are "normal" (NOT aluminum, etc.)
Weight of the first one we received is 4229 grams, weight of a 93-95 rotor (approximately the same as 89-92's) is 4359 grams (so RX-8 ones are ~130 grams lighter) They are .004" thinner across the side seal area, .0015 thinner at the first "land" area outside the oil control rings, and equal to earlier rotors across the gear. We will be doing more measuring -- looks like the face of the rotor is about .005 "smaller" about 1" down from the apex seals -- looks like MAZDA just gave it more clearance about everywhere it needed it. We are working on determining the casting thickness of the bottom of the apex seal groove -- need to see if it's possible to machine them down to take earlier apex seals. ---- The RX-8 apex seal is considerably smaller in beam height/strength. We will be finding out soon (week or two?) if the RX-8 apex seal will "fall into" the peripheral exhaust port of the earlier rotor housings (yes, we are going to find out the hard/high$$ way !!). The "blow-by/scraper" rings should only be needed with the RX-8 side exhaust port side housings. We are "building/adding to" our RX-8 website almost daily. http://www.mazdatrix.com/index8.htm The RX-8 rotors have a stamp by each side seal groove, and there are 4 different side seal lengths covering the 16! different letter stamps for length. http://www.mazdatrix.com/8engine2.htm --- Looks like that means you can't really buy side seals before you know the ALL the letter stamps on EACH rotor (that is going to be a real pain!) -- only other solution would be purchase all longest ones, then grind to fit (as we do now). Weights: 14 grams = stock 2 piece 3mm apex seal 10 grams = stock 3 piece 2mm apex seal 9 grams = new stock 2 piece 2mm seal *** 5 grams = stock 2 piece RX-8 seal 4 grams = 3mm carbon seal 4 grams = 2mm ceramic seal 3 grams = 2mm carbon seal *** !! We received our first of the new OEM seals this week (they sent 5 !!!!). The 3-piece 2mm seals are being replaced by these new 2 piece ones from MAZDA. Anyway - LOTS more to look at / measure / etc -- we only received that first rotor yesterday! Dave Lemon |
good stuff :D
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So, they should fit into the earlier 13B engine right ?
It would be nice to have a lightweight 10:1 Mazda rotor right off-shelf instead the 9.7:1 rotor. |
"FIT" and "WORK" are two VERY different things --
As I said: "We will be finding out soon (week or two?) if the RX-8 apex seal will "fall into" the peripheral exhaust port of the earlier rotor housings (yes, we are going to find out the hard/high$$ way !!). " "Possible/probable" results of the "test" should be: 1) Worked fine - then we continue with testing to see if they make ANY more power. 2) Somewhere in the initial warm-up/break-in period the apex seal center "falls" into exhaust port, catches the top of the exhaust port, gouges the rotor housing, breaks the apex seal into various pieces which those pieces then continue gouging the rotor housing and the face of the rotors - thereby writing off approximately $2500 of parts + labor to assemble an engine. 3) After 6+ hours of break-in!!, on the FIRST hard pull, the apex seal center "falls" into exhaust port, catches the top of the exhaust port, gouges the rotor housing, breaks the apex seal into various pieces which those pieces then continue gouging the rotor housing and the face of the rotors - thereby writing off approximately $2500 of parts + labor to assemble an engine. 3) Initially works "OK", then somewhere down the line, with FULL load on the engine, THEN the apex seal(s) decide to fall into the holes. I'm putting my money (literally) somewhere between #2 and #3 -- but then, hey, SOMEBODY has to be stupid enough to try it!! |
Dave,
I'm not understanding htis comment "*** !! We received our first of the new OEM seals this week (they sent 5 !!!!). The 3-piece 2mm seals are being replaced by these new 2 piece ones from MAZDA." does that mean the new apex seals fro the old engines (ie 13-REW, 13BT for FCs) have a new type of 2 peice 2 millimeter apex seals offered by mazda? |
Yes, the COUNTRY has been out of the 3-piece 2mm seals for a few months -- just working out of existing inventories. We were seeing a "new" part number listed as a "replacement/option" for them, but there were none available of EITHER type.
The "new" 2-piece 2mm ones are now showing up, and there are still none listed in the country of the 3-pieces. We assume Mazda will do a full "supersession" of the 3-piece # to the newer 2-piece part number fairly soon. They are "normal" looking 2-piece seals. We received another 50 or 60 of them today. Part number is changing from an N3F1 to a N351. Dave Lemon |
hey Mazdatrix, don't forget that the rotors are already clipped on the trailing side to delay intake port closure.
thanks for clearing up the confusions. |
You think there going to fall in because the shorter seals wont have enough stiffness to resist bending when the center of the seal isnt supported by the housing? Are you testing them on completely stock housings?
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those 1.5 MM Apex seals are gonna do wonders when the boost the rx8.
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Um, they are not 1.5mm... they are 2mm... and in fact the RX-8 seals are superceding the 86-02 3-piece seals. Hook on Phonics didn't work for you I take it? :)
I don't understand two things here... One, if the height of the seals is shorter than the older stuff, how can they be used in the '86-02 rotors? Wouldn't there be not enough preload on the springs, given that the seal groove depths are different? Or am I missing something here (like aternative springs for using the seals in rotors designed for the 3pc seals) Two, why would there be a problem with falling in the exhaust port? They shouldn't be any flimsier than 3-piece seals, and if anything should be stiffer. My bets are that they'll be fine... after all, they are superceding the 3pc seals so Mazda must trust that they will work OK with peripheral exhausts? (and intakes for that matter) On another note... thank you for posting the seal weights. That's something I've been trying to find out for months. |
Originally posted by 911GT2 Put your hand behind your honda exhaust while the car is running. Then do the same with your 7. Nuff said. |
Originally posted by Maxthe7man The thermal efficiency of the rotary is bad enough with Iron rotors, with aluminium, it would be even worse, Look at the size of an Rx-7 radiator compared to that of any other small 4 banger, then consider what size it would be if even it had to deal with 10% more heat..The only way around it would be a thermal resistant coating on the face and sides of the rotor..Max |
Originally posted by peejay Um, they are not 1.5mm... they are 2mm... and in fact the RX-8 seals are superceding the 86-02 3-piece seals. Hook on Phonics didn't work for you I take it? :) I don't understand two things here... One, if the height of the seals is shorter than the older stuff, how can they be used in the '86-02 rotors? Wouldn't there be not enough preload on the springs, given that the seal groove depths are different? Or am I missing something here (like aternative springs for using the seals in rotors designed for the 3pc seals) Two, why would there be a problem with falling in the exhaust port? They shouldn't be any flimsier than 3-piece seals, and if anything should be stiffer. My bets are that they'll be fine... after all, they are superceding the 3pc seals so Mazda must trust that they will work OK with peripheral exhausts? (and intakes for that matter) On another note... thank you for posting the seal weights. That's something I've been trying to find out for months. n3f1 = 2mm 3peice n3h1 = 2mm 2 peice renisis (short) n351? = 2mm 2 peice renisis style tall seal for the 86-02 motors, dave isnt n351 and old number? weird mike |
This picture will help answer questions:
Top seal (thinner one) is the RX-8 apex seal -- it will NOT work in earlier rotors. The apex seal groove is CONSIDERABLY shallower on the RX-8 rotors. The lower seal in the picture is the "new" 2-PIECE 2mm apex seal from Mazda that will? be replacing the former 3-piece 2mm seals used on 86-95 rotors. |
Seeing if the picture shows up in this post --
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picture
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Okay, makes more sense now. Thank you.
I *feel* that the RX-8 apex seals should still be fine over the exhaust opening. They appear to be taller than the sealing half of the 3piece seal, and those obviously don't have any problems with "falling in". (especially after trying to disassemble some trashed rotors and seeing just how much those things can flex without breaking!) Of course, what people think is one thing, what actually happens is a different story... |
Originally posted by peejay The third "oil control" ring is actually called a scraper. Protects the oil rings from exhaust heat, donchaknow. BTW - something I've been meaning to ask, and this is as good a place as any: What is the engine's designation? Is it a 13C? 13B-MSP? (I *refuse* to call this thing a "Renesis", that is the lamest marketing-fabricated pseudoword *ever*) Interesting thing I noticed was that there was a serial number stamped on each housing next to the 13B. (stamped with a hammer driven stamp) |
Renesis Rotors
I was told that these rotor will fit the 13b engine. They are the same size. They also said that they are 14% lighter that 13b rotors.
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the service higlighs book call it the 13b-MSP, presumably its either multi side port, or missing some power, you decide
mike |
This is a good thread with damn good info from Mazdatrix. Maybe a possible sticky?
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Interesting that the seal is "shallower" than the previous 13B seals.
Is it only done for weight reduction? It does look more "flexy" than the N351 seal. If it does "fall in" on stock rotor housings, I guess you could always get the RX-8 housings and have smaller exhaust ports :( J |
I imagine that shorter also provides it some additional rigidity due to shallower height.
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being a two piece seal it will be thicker though ... that would help with rigidity somewhat (not as much of an effect as changing the depth though)
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