13B internals
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From: NY
13B internals
Hello , I'm new to this forum and this whole rotary engines and I have a couple of beginners questions.
First: is there a diffrence between the eccentric shaft for the 13B single turbo and the twin turbo models? if yes, what are the differences?
Second: Is there a difference between the front and rear rotors? I did some research and apparently some people say yes and some people say no.
Third: does the rotors have to be from the same engine? I have a couple of engines here and a lot of rotors. can I assemble an engine on different rotors (that belong to different engines).
Thank you so much for taking the time to read this and reply and excuse me if I seem like a noob
First: is there a diffrence between the eccentric shaft for the 13B single turbo and the twin turbo models? if yes, what are the differences?
Second: Is there a difference between the front and rear rotors? I did some research and apparently some people say yes and some people say no.
Third: does the rotors have to be from the same engine? I have a couple of engines here and a lot of rotors. can I assemble an engine on different rotors (that belong to different engines).
Thank you so much for taking the time to read this and reply and excuse me if I seem like a noob
Joined: Mar 2001
Posts: 31,835
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From: https://www2.mazda.com/en/100th/
1. yes, although its a small one. the twin turbo has slightly more bearing clearance on the rear half of the rear main bearing, and i think the front of the front. this improves wear at high rpm.
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
1. yes, although its a small one. the twin turbo has slightly more bearing clearance on the rear half of the rear main bearing, and i think the front of the front. this improves wear at high rpm.
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
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Joined: Feb 2015
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From: NY
1. yes, although its a small one. the twin turbo has slightly more bearing clearance on the rear half of the rear main bearing, and i think the front of the front. this improves wear at high rpm.
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
I have one more question, can I use a eccentric shaft from a single turbo engine in a twin turbo engine?
1. yes, although its a small one. the twin turbo has slightly more bearing clearance on the rear half of the rear main bearing, and i think the front of the front. this improves wear at high rpm.
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
its a good idea to keep them in the same place they started. actually if its got a lip big enough to matter, its probably bad anyways
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
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the twin turbo eccentric shaft that I have is worn where the bearing is. and I have an almost new eccentric shaft from a single turbo engine, and there is no rotary parts where I live that's why I want to use this eccentric shaft.
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Due to natural variation in the manufacturing process, not every single rotor is actually the same weight. To ensure the two rotors are as closely matched as possible mazda stamped letters on them which placed them within weight categories. Even if both rotors are of the same series (S4/S5), its good to check to make sure they both have the same letter stamped on them
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1. yes, although its a small one. the twin turbo has slightly more bearing clearance on the rear half of the rear main bearing, and i think the front of the front. this improves wear at high rpm.
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
2. some engines have different rotors front and rear some engines are the same. the Rx8's, and 76-85 12A's are different front and rear. every thing else uses the same rotor for both positions.
3. you can mix and match, but only within a "series". the FC engines are early (s4) and late (s5), and among other things Mazda changed the weight, so the rotors and counterweights need to be swapped in sets. it is good practice to keep a rotating assembly together. you wouldn't want to mix up the pushrods on your chevy, just as you'd want to keep the rotating set together
and is it okay to use an eccentric shaft from a single turbo engine to a twin turbo engine?
Joined: Aug 2002
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From: Freeland, MI
so if you have a B weight rotor, than you can use a A, or a C, but NOT a D along with it, but this is only for road cars, if your trying to build a decent HP engine, than you want to stay with the same letter stamp rotors
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yes, it is very possible, BUT, it should always be only 1 letter apart
so if you have a B weight rotor, than you can use a A, or a C, but NOT a D along with it, but this is only for road cars, if your trying to build a decent HP engine, than you want to stay with the same letter stamp rotors
so if you have a B weight rotor, than you can use a A, or a C, but NOT a D along with it, but this is only for road cars, if your trying to build a decent HP engine, than you want to stay with the same letter stamp rotors
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