It occured to me when browsing the forum today that it would be pretty cool to have a rotary without a rev limiter. I understand it's more necessary with a piston engine because of the reciprocal motion of the pistons, but with a rotary, besides not doing it on a daily basis, is it possible to remove the limiter (for $hits and giggles) and rev to 12k if one desired to without causing a serious problem? I understand that there is little point since the torque curve would keep descending, but I think it would be neat nonetheless. Thoughts?

 

dude everyone knows why there is a reason for the rev limiter. I'm sure you can take off the rev limiter or raising it a bit by reprogramming your ecu. but at best I bet the engine won't even rev as high as 12k if you did woudn't the rotor just end up flying out of the engine?

 

So do I... I wasn't asking about the device's function, I was simply asking if it could be removed, and if so, how damaging would it be to rev it higher than redline every so often.

 

Considering someone on the rx7 forum showed their engine getting over 10k rpm and the rotors in the Renesis are 14% lighter than in the 13b, the renisis should easily get over 11k while putting the same stress on the apex seals (Im not sure how reliable it would be at that high revs).

 

Im not sure but I don't think you can rev it higher with out making the E. Shaft thicker so there is less flex at the higher revs so the rotor will not hit the rotor housing and side housing by having so much flex it compresses the springs flat. If we knew that the E. Shaft was strong enough to not flex so it would not hit the side housings and rotor housing it might be possible to put stronger springs and rev to the sky.

 

You are limited by a few things,
-The bearing clearance usually needs to be .005" greater in the groove for more oil at high rpm's. A good example if MFR bearings.
-The clutch has an organic lining which has a max rpm before it disinigrates
-The e-shaft has never been a problem at 10k+ before, shouldn't be now.
-I am not sure of the ignition system, but it too can fail at that high of rpm, you dont want timing mistakes at 10K+

Kyle Lancaster--Double Agent Salesman

 

IMHO.. not having a rev. limiter in a street driven 13B would be just plain worthless!! Reason:

1. The RENESIS or 13B engine it's not a racing engine.
2. Yes you can rev. as much as 12000rpm - 14000rpm, but why? Your factory port or even street port naturally aspirated rotary would not make any more torque and power up there!
3. Your wear & tear will be greater. To obtain those RPM, the rotary would need more air, fuel, & thus more oil rotor + housing lubrication... oiling injection could fail. Using pre-mix would be the choice of +10,000rpm rev.
4. Some automobile factory EFI can handle up to rev. up to 11,000-12,000rpm in sequential injection.. (i.e.: Honda). Unless, the Mazda RX-8 factory Mazda computer is fast enough to control the sequential injection pulse, and timing doing past 11,000rpm without using some sort of batch injection...then we have to see that... 32bit ecm's would be nice... but still pointless in reving a rotary more than 11000rpm.