10,000rpm?!?
11-24-11, 12:54 AM
#1
MEOOOWW-cat back exhaust-
Thread Starter
10,000rpm?!?
id like to know.how exactly i can achieve 10k with my 13b n/a. honestly ill admit to being a noob @ rotarys. but i want to learn everything about these beauties 
11-24-11, 01:12 AM
#2
Really? You probably could have done a half hour of searching and found the answer
10k rpm involves ripping apart the motor and upgrading a few things to take the abuse. Then you have to figure out how to tweak the motor so it will actually make some power above the normal power band, otherwise you've got nothing than an interesting gimmick. Neither operation would likely be successful if you are new to Wankel engines
10k rpm involves ripping apart the motor and upgrading a few things to take the abuse. Then you have to figure out how to tweak the motor so it will actually make some power above the normal power band, otherwise you've got nothing than an interesting gimmick. Neither operation would likely be successful if you are new to Wankel engines
11-24-11, 02:55 AM
#4
Rotary Enthusiast
Really? You probably could have done a half hour of searching and found the answer
10k rpm involves ripping apart the motor and upgrading a few things to take the abuse. Then you have to figure out how to tweak the motor so it will actually make some power above the normal power band, otherwise you've got nothing than an interesting gimmick. Neither operation would likely be successful if you are new to Wankel engines
10k rpm involves ripping apart the motor and upgrading a few things to take the abuse. Then you have to figure out how to tweak the motor so it will actually make some power above the normal power band, otherwise you've got nothing than an interesting gimmick. Neither operation would likely be successful if you are new to Wankel engines
HAHAHAHHAHA yep rev's have nothing to do with power do they !! .
Physic's 101.Physic's 101. Power is a direct multiplier of RPM.
torque * RPM ÷ 5252 = HP
Yes you will have to modify the stock engine as its not designed for the RPM, but yes stock blocks can go to that range (though risky) the biggest issue is balance, tune and fuel.
11-24-11, 03:43 AM
#5
That assumes torque is constant, or increasing as RPMs go up. Unfortunately in real life, torque tends to start dropping quite quickly just before the readline. You can actually end up making less HP at 10k RPM than at the top of the power band (~7k RPM assuming a NA 13b).
Physics 101 is nice to illustrate concepts, but breaks down really fast in the real world. Modern engines involve a lot more than just 2 simple variables
Physics 101 is nice to illustrate concepts, but breaks down really fast in the real world. Modern engines involve a lot more than just 2 simple variables
11-24-11, 10:35 AM
#7
yes he is right, stock porting the motor will fall on it's face far short of 10k RPMs.
stock internals will have issues revving that high without balancing, lightening and clearancing.
the stock cast flywheel also has a tendency to want to explode at those RPMs so you need a chromoly or aluminum lightweight flywheel.
lastly, you need a reprogrammable engine management system, the stock ECU is not setup to go that high.
stock internals will have issues revving that high without balancing, lightening and clearancing.
the stock cast flywheel also has a tendency to want to explode at those RPMs so you need a chromoly or aluminum lightweight flywheel.
lastly, you need a reprogrammable engine management system, the stock ECU is not setup to go that high.
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11-24-11, 10:45 AM
#8
What the Hell?
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For the N/A, go for nitrious, it would be a whole lot cheaper and satisfying.
Last edited by Clark13b; 11-24-11 at 10:53 AM.
11-24-11, 11:44 AM
#9
I suppose this is what scatter shields are for. I've seen vids of 'clutch explosions', but I never thought about the flywheel itself blowing to bits, now that I do that makes perfect sense. Smaller diameter clutch systems would probably help, too $$$$!
11-24-11, 11:50 AM
#10
honestly i'd do both, but never would retain the stock heavy cast flywheel, it is the first thing that is going to literally grenade and also the heaviest and most likely to make it through the bellhousing, firewall and your skin. just about anything in there can explode when pushing over 10k RPMs with minor imbalances but i wouldn't solely rely on just a scatter shield.
11-24-11, 12:16 PM
#11
Absolutely agreed, not to mention the scatter shield is only a safety mechanism and should be in place only as a last line of defense against exploding clutches. You get other benefits from a smaller, lighter clutch pack, plus you don't want to put all that time/money into a powerful machine only to have a clutch that's less likely to hold up to the abuse. Brakes and wheels are easy to replace, but a clutch explosion will take you out of a race completely, scatter shield or not.
11-24-11, 03:18 PM
#12
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HAHAHAHHAHA yep rev's have nothing to do with power do they !! . Physic's 101.
Physic's 101. Power is a direct multiplier of RPM.
torque * RPM ÷ 5252 = HP
Yes you will have to modify the stock engine as its not designed for the RPM, but yes stock blocks can go to that range (though risky) the biggest issue is balance, tune and fuel.
Physic's 101.Physic's 101. Power is a direct multiplier of RPM.
torque * RPM ÷ 5252 = HP
Yes you will have to modify the stock engine as its not designed for the RPM, but yes stock blocks can go to that range (though risky) the biggest issue is balance, tune and fuel.
I had to.
11-24-11, 07:04 PM
#13
Rotary Enthusiast
^ ?
The physic's are not wrong. I never said he would make more HP, everyone know's torque isn't constant or linear (for rotaries). Just making it clear that rpm (at any range) is a direct multiplier to hp.
Some of you guys make it sounds like its impossible to get a 13b na to 10K (just for the hell of it, not for the max hp)
The physic's are not wrong. I never said he would make more HP, everyone know's torque isn't constant or linear (for rotaries). Just making it clear that rpm (at any range) is a direct multiplier to hp.
Some of you guys make it sounds like its impossible to get a 13b na to 10K (just for the hell of it, not for the max hp)
11-24-11, 07:18 PM
#14
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https://docs.google.com/viewer?a=v&p...4NmVj&hl=en_US
https://docs.google.com/leaf?id=0Bzy...wMzVm&hl=en_US
It's not impossible, but it is stupid waste of time and money to build a 10K rpm motor that makes the car go slower than it would with the stock motor.
12-09-11, 01:14 PM
#16
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true that . an exploding flywheel or clutch setup is a nastyyyy sight to see . shield or not , those projectiles are certain to do some damage somewhere along the line lol
12-09-11, 02:13 PM
#17
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12-10-11, 12:14 AM
#18
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I did not see carbon apex seals yet, figured Id add it in.
Friend of mine had a 12a he ran to 9500, I pulled my legs back every time he went well past redline. Yep, he had a stock clutch.
Friend of mine had a 12a he ran to 9500, I pulled my legs back every time he went well past redline. Yep, he had a stock clutch.
12-10-11, 06:55 PM
#21
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it goes to 11
03-28-12, 04:53 AM
#22
MEOOOWW-cat back exhaust-
Thread Starter
let me clarify my 1st post to this. i wanted to SAFELY rev to 10k if needed but not constantly that high. P. F**King S. my car was stolen not even 3 hrs ago heres the post https://www.rx7club.com/2nd-generation-specific-1986-1992-17/stolen-1988-rx7-gxl-992888/
03-28-12, 09:27 AM
#23
It had hardened stat gears, Mazda race rotors, aluminum flywheel and was balanced. It was a half bridge port.
