Rotor Swap into 20B
03-21-04, 05:43 PM
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Rotor Swap into 20B
I did a search on this but couldn't find anything so here goes...
Can you directly swap in RX-8 rotors into the 20B? What are the RX-8 rotors compression ratio as well?
I don't want to do any machining or modifying/clearancing, etc, I just want to put them in like the 86-91 NA and Turbo rotors.
What about the 93-95's? Thought those would work as well.
Just asking because I have the motor apart and am exploring options.
Can you directly swap in RX-8 rotors into the 20B? What are the RX-8 rotors compression ratio as well?
I don't want to do any machining or modifying/clearancing, etc, I just want to put them in like the 86-91 NA and Turbo rotors.
What about the 93-95's? Thought those would work as well.
Just asking because I have the motor apart and am exploring options.
03-21-04, 09:14 PM
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the rx8 rotors do fit in the 13b, the only problem with the 20b is that theres no balance weights for a 3 rotor renisis. on a 13b you can use the rx8 rotors and cw's and be done, but you cant on a 20b. the alternative are the 89-91 na rotors, as they have the same balance wieght as the stock 20b rotors
03-27-04, 08:21 PM
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Why???
Well, the theory was lighter rotors & thus less mass, higher compression and 40% less cost each than 20B rotors (per the Mazdacomp costing I get). Good enough for ya?
No big deal, I'll just go with the S5 NA rotors like I was planning.
Well, the theory was lighter rotors & thus less mass, higher compression and 40% less cost each than 20B rotors (per the Mazdacomp costing I get). Good enough for ya?
No big deal, I'll just go with the S5 NA rotors like I was planning.
03-28-04, 10:15 AM
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Originally posted by johnisenglish
On a side note, the 20B rotors are the same weight and compression as the 13brew, right?
On a side note, the 20B rotors are the same weight and compression as the 13brew, right?
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03-28-04, 01:51 PM
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Do you think you could redrill and rebalance a Renensis rear counterweight? It may not be a good idea due to there being two key slots at that point. I guess you could fill one of them in? Same for the front counterwight. Do you guys understand what I'm talking about?
03-29-04, 04:35 AM
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May be easier/safer to mill out your own piece instead of trying to fill a slot in with weld, then get the piece heat treated after. Problem would be trying to find out what process they were using (T6, T7, etc) for that alloy.
03-29-04, 06:54 PM
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I called Mazdacomp today and they gave me the name/number of a factory Mazda rotary engine builder who can supposed answer all these questions and has done this kind of thing for years. I am having my local shop/engine builder call him so they can work out the details. Will post if anything interesting.
03-29-04, 09:41 PM
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Has anyone had problems with the big metal plate cracking.the one were you fill the oil into the engine on a 20B?what can i do to resolve this problem?I got a 20B on my s-10 blazer and this weekend it happened to me.
03-30-04, 09:10 PM
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Don't see how this has to do with changing rotors in the motor, get your own thread...
On a side note, my 1st and 2nd intermediate housings both cracked from water expanding over the winter... i.e., why the friggin' thing is apart now.
On a side note, my 1st and 2nd intermediate housings both cracked from water expanding over the winter... i.e., why the friggin' thing is apart now.
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