What are the maximum RPM speeds that can be safely attained on stock internals?
I understand the need for strengthened stationary gears... Are they stronger on the RE, REW and Renisis lumps?
And correct clearancing etc for real high RPMs
dunno if it\'s any help, but my rev limit has been raised from 7800 to 8100rpm, so I assume that there is a bit of margin on top of that as well.
graeme
8,500 is about the highest you can go, above that your looking at more cash, clearing, scalloped rotors maybe, and definately a dry sump. Roughly 2,500 for that alone. Should get 10,000 rpm with that kind of stuff though.
I raised my rpm just by pressing the pedal a bit further.lol. sorry couldn resist.
I run up to 9000 rpm, clearenced motors were the only mod to acheive this.
Everything else stock, normal sump, but obviously you should have decent ports to make use of the higher rpm.
8500rpm for everything stock, if its a FC motor then bearings and gears from the rew motor
Quote from: Grant Monkhouse;7513358,500 is about the highest you can go
Is that all?? Not played with the rev limit on the rex yet but redline in the Civic is like 8k lol
No ones mentioned ancillaries so I will - water pump and oil pump need to be taken into account for the higher revs. Also alternator ?
You can get underdrive pulley kits for the water pump and alt, but the oil pump is on a chain behind the front cover - not sure if this requires any modification to support the increase in rpm, have seen a number of sites say that shimming the oil pressure reg is a good idea - but no one really gives a good explanation of why.
Thanks guys, (especially the kiwi :p)
Quote from: Lacey;751358Is that all?? Not played with the rev limit on the rex yet but redline in the Civic is like 8k lol
yep, everyone goes on about how VTEC engines (S2000 for example) can rev to 9k. Rotaries can get almost there as stock and much higher with a bit of work.
One of the reasons you can get more power to the wheels out of a smaller capacity engine is that the rotors and driveshaft rotate on the same axis, makes it easier to do. In a boinger you have to turn up and down motion into rotational motion. You lose a bit of energy doing this.
graeme
My brothers 12a peaks 9500 rpm nicely. And around 8000 rpm ot runs very smooth. Stock internals, stock balances, stock bearings. Engine is street portet and checked.
So far water and oil pump has worked but alternator belt keeps blowing up. ;)
Quote from: trotter;751370yep, everyone goes on about how VTEC engines (S2000 for example) can rev to 9k. Rotaries can get almost there as stock and much higher with a bit of work.
yeah, but, Honda motors have a powerband that\'s slimmer than a gnat\'s private bits :)
At what point are you seeing the power drop off Blitz?
Quote from: Lacey;751358Is that all?? Not played with the rev limit on the rex yet but redline in the Civic is like 8k lol
Why rev to 12000 rpm if you don\'t need too. I don\'t need to rev the engine much above 7000 - it makes copious power from 4K through to 7K and roads are too short to excersize it anyhoo. :cheers
Quote from: Brett;751603At what point are you seeing the power drop off Blitz?
it doesn\'t :D, good ports and mapping :chat
My Kwak redlines at about 15 500 but it has to because its a tiny engine that doesnt make much torque and its internals are light and small enough to accelerate, stop and reverse like 200 times second. Like Prof said, why do it if you don\'t have to though? Hondas are just frustrating and annoying the way you have to cane the hell out of them all the time just to get them to not be overtaken by stationary objects. It\'s a stupid way of getting power. The more engines are tuned for revs the more difficult they become to use and the more ineffective they tend to become at most of their rev range other than the narrow band they\'ve been tuned for. And that\'s with nice poppet valves and cam timing that\'s a given quantity, not with porting and overlap issues to address like on a rotary, not to mention coping with a combustion chamber that not only changes shape but physically moves about. The gas flow dynamics are scary! I think the reason that rotaries don\'t exploit their theoretical rev advantage more (ie lack of reciprocating inertia) is that the law of diminishing returns simply makes it less worthwhile the higher you go.
I so want to change my FC gauges to this (red line):
http://www.streetfire.net/video/mps-mazda-rx7-3-rotor-20b-peripheral-port-turbo-w_39700.htm
You can see the sort of mods it has in other videos :)
Also check the fuel guage before and after the video on this one!
http://www.streetfire.net/video/mps-mazda-rx7-3-rotor-20b-peripheral-port-turbo-w_39701.htm
My RX8 revs to 9344rpm, according to the CampII.
Quote from: m1tch;751719Also check the fuel guage before and after the video on this one!
http://www.streetfire.net/video/mps-mazda-rx7-3-rotor-20b-peripheral-port-turbo-w_39701.htm
lmao, you actually see it drop!
Quote from: Will66;751723My RX8 revs to 9344rpm, according to the CampII.
Soft limit on ours is @ 9250rpm too :)
that drop\'s probably the fuel being forced to the back of the tank, but impressive none the less