3 Rotor Practical or not?
06-15-10, 01:19 PM
#1
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Thread Starter
3 Rotor Practical or not?
I have two s4 n/a engines both in decent condition but need rebuilding. I have enough parts between the two engines to make a 3 rotor block, minus the eccentric shaft. I understand I would need coils, a new ecu, some fuel pumping upgrades, along with a nice clutch and some stuff to keep this thing cool. I am looking to drift my rx7, and am shooting for around 450-500 horses. I also do not want to deal with turbos, so i will keep it N/A. Is this a possible goal, and is this practical? My other option is buying an eunos cosmos 20b which is also expensive and still having to buy an ecu etc. I could also build up the 13b but this is also an expensive route because along the way id still need a new ecu. Tell me your opinions, and no I dont want pistons in my rx7.
haha i forgot the R in rotor. o well.
haha i forgot the R in rotor. o well.
Last edited by stuwk1; 06-15-10 at 01:22 PM.
06-15-10, 01:32 PM
#2
Engine, Not Motor
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Nothing from your 13Bs will be of use in a 3 rotor except for the rotors and housings. The 20B uses different irons with a different port configuration. Also there is a center "thick" iron that contains another bearing. These are getting more rare by the minute, so good luck finding one. Even if you did build some kind of hybrid 3 rotor with a 20B eccentric, thick iron, TII/NA end irons (which have different ports), NA housings, NA rotors, etc. you would have to build your own intake manifold because 20B stuff wouldn't fit.
If you want a three rotor and don't have a machine shop, then you need to buy a 20B. Don't waste time on the Cosmo ECU and harness, it won't work. You need a full standalone.
You're not going to make 500HP on a 20B NA unless it is a peripheral port and you are spinning it to 10K. Which will require balancing and a host of custom work.
You're flat out not going to make 400-500HP NA without a LOT of expense and custom work.
If you want that kind of power, the only "practical" way is via forced induction.
If you want a three rotor and don't have a machine shop, then you need to buy a 20B. Don't waste time on the Cosmo ECU and harness, it won't work. You need a full standalone.
You're not going to make 500HP on a 20B NA unless it is a peripheral port and you are spinning it to 10K. Which will require balancing and a host of custom work.
You're flat out not going to make 400-500HP NA without a LOT of expense and custom work.
If you want that kind of power, the only "practical" way is via forced induction.
06-15-10, 04:15 PM
#5
Roto Racing Development
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if your looking into drift use your money for a good suspension set up. better 1.5 lsd, strong clutch and flywheel. aluminum drive shaft brakes and a roll bar. i personally wouldnt recommend a turbo for drift because it would make throttle control a bit more tricky. look drifting doesnt need 500bhp 200bhp is a good amount but remember any kind of racing has to do with balance. power-response-drivability-durability. balance is the key word.
06-15-10, 05:18 PM
#6
You could build a Peripheral Port 3 Rotor using 13B parts. You still would need to modify an iron to accept another stationary gear and you would need to buy a short 3 Rotor eccentric shaft. Not to mention building a header for it, getting the right ECU, tunning, etc. Either way you go, getting to your 450-500whp goal is going to cost you a good bit of money. Turbo's are fine for drifitng as long as you select the right turbo and set it up properly.
