Rx8 rotors in 13B
#1
I'm running a 13B n/a, running the standard rotors and stand apex seals its rare you see many upgrades for the actual rotors i was wondering if anyway has ever seen/heard of anyone to use the RX8 rotors in the old FC3S 13B engine?
any opinions/suggestions would be appreciated
Sean - in search of 10,000rpm everyday
any opinions/suggestions would be appreciated
Sean - in search of 10,000rpm everyday
#2
Haven't heard anything about using the rotors... HOWEVER I have heard of using the eccentric shaft and you can loose about a half pound. It requires modification to use it but less rotating mass is less rotating mass.
#3
hmmm not a bad idea, with anyluck it should be a bit more balanced aswell although i'm just speculating that. If fitting RX8 rotors seems an impossible task other than changing the rotor apex seals, has anyone got any other suggestions to make the 13B be able to handle this sort of high end rpm and continue to be smooth and balanced???
I have heard about porting the rotors but i'm not sure if what all the gains are from this and is this going to upset the rotors balance at high rpm??????
I have heard about porting the rotors but i'm not sure if what all the gains are from this and is this going to upset the rotors balance at high rpm??????
#4
people have tried the rx8 rotors, but they arent a bolt in deal, they need a lot of work, and dont seem to be any better than the late 9.7 rotors power wise.
best setup for an na 13b rotating assembly is;
89-91 9.7 rotors
rx8 e shaft
light flywheel/clutch combo
rx8 stationary gears
balance the whole thing, and run 100+ psi of oil pressure
the next hurdle is to actually make it have power up that high...
best setup for an na 13b rotating assembly is;
89-91 9.7 rotors
rx8 e shaft
light flywheel/clutch combo
rx8 stationary gears
balance the whole thing, and run 100+ psi of oil pressure
the next hurdle is to actually make it have power up that high...
#6
you have to machine them among other things...lots of $, not big enough gain.
the compression jump isnt where the power gain is either...
its that the rotors are beveled slightly and lighter. just get the internal set up that j9 stated and before you get them balanced, have them beveled (some people call it chamfing). it opens the ports earlier and closes later (like porting up or down on the intake ports). plus, the weight drop is extreme depending on how far you go. but if you go to much, the side seals come into risk.
the compression jump isnt where the power gain is either...
its that the rotors are beveled slightly and lighter. just get the internal set up that j9 stated and before you get them balanced, have them beveled (some people call it chamfing). it opens the ports earlier and closes later (like porting up or down on the intake ports). plus, the weight drop is extreme depending on how far you go. but if you go to much, the side seals come into risk.
#8
Using the RX-8 shaft with FC rotors is a bad idea. You'll still be using FC counterweights, but they'll have to be rebalanced due to the lightness of the eccentric shaft. this actually involves ADDING weight to the counterweights to compensate for the lighter e-shaft. This weight will be further away from the center of rotation than the weight from a stock FC shaft which is in the shaft itself, and the overall effect is more rotational resistance with an RX-8 shaft and proper balancing.
The RX-8 stat gears also sort of suck. They are made of lower quality material and they dont have the oil seal ring groove on them.
The RX-8 stat gears also sort of suck. They are made of lower quality material and they dont have the oil seal ring groove on them.