kyle@insight

Anyone ever done one of these? A friend of mine and I have been kicking around the idea of building a pretty crazy all-rotor RX3.

Plans are the 6 port motor from the 2nd gens, high compression like 12.5:1, maybe higher if we feel froggy, and some sort of crazy port like a bridgeport. Anyone ever done a setup like this? What were the dyno results? Besides the basics like what I listed, what else could we do to get some power? Exhaust of course, but we were also trying to figure out a way to get some more induction. Maybe converting the 13b to carb and runing a big fat holley?

Lemme know what you think, feel free to suggest other setups. The plan is to basically get as much all-motor power as we can so we're open to anything.

annuerysm

how are you going to change the compression to 12.5?

kyle@insight

I figured you could get higher compression rotors couldnt you?

CrackHeadMel

iTrader: (2)

anythings possible with $ ( i know you didnt want to hear that) but ive never in the countless nights ive spend online reading bout rotarys seen someoen running anything higher than 9.7:1 CR

annuerysm

the new renesis rotors are higher comp (10.0) I believe.

kyle@insight

hmmm I would have thought those crazy puerto ricans who build the nasty 1st gens would be using higher compression rotors. I just can't see what would hold companies back from producing them. As if rotaries weren't kicking enough *** in all-motor drags, they could further seperate themselves from the piston guys.

88IntegraLS

It is called detonation. Remember, the rotary has a very funky compression chamber shape compared to a piston engine which may make super high compression ratios unfeasable. Racing beat makes some custom high compression ratio rotors but I don't think they are in the 12:1 range.

kyle@insight

eh, I gotta question that a bit. On NA FCs the compression ratio is 9.6:1 and it's perfectly safe to run 89 octane, so say you ran 100 octane or even 93? You'd obviously have more room for compression, no?

Scalliwag

The challenge is building the rotors up. Then you would have to have them balanced as well.
Plus you better know a little math to calculate the size to cut the rotors back to. It would be a expensive project if you do not have a machinist in the family

Liquid Anarchy

iTrader: (2)

If you want a high-HP N/A, use the S5 rotors in a TII 4port block. You've got a lot to learn...

kyle@insight

Gotta start somewhere.

Liquid Anarchy

iTrader: (2)

Then it's probably in your intrest to do a search of the 1st and 2nd gen forums about high RPM n/a's.

Also, I've found racing beat's catalog/tech manual very helpful.

Better to start off with those things than asking pretty simple questions.

Suds7

If you run higher compression than about 10to1 (that the renesis runs) the petroichoid shape of the rotor housing will actually split your compression face in half and make two seperate combustion chambers (nasty!) and really cause problems (detonation?).

The best way to make power on a rotary is forced induction, it is king!