i have three fcs 2 are n/a (one running, one not) , and i have a turbo2 fc with a detonated rear rotor. the housings in the turbo2 block seem to have survived blowing an apex seal. so im wondering if my n/a rotors are usable: if i can swap my n/a rotors and eshaft into my turbo2 block and rebuild it that way. please let me know anything yall might know, i appreciate any help!

 

Good question. I too would like to know about this..

 

Yes, the rotors will fit, but the NA rotors have a higher compression ratio than the turbo rotors. Therefore, if you install the NA rotors then the engine would make better power before the boost kicks in, but the engine would be more prone to detonation. Since you have already detonated your low-compression rotors, replacing them with high-compression rotors may not be the best idea unless you compensate with lower boost, better tuning, higher octane fuel, or fixing whatever caused the first detonation problem.

The rotors, counterweights, and flywheels are balanced to match the same series RX-7, so don't mix 86-88 rotors with 89-92 counterweights and flywheels, or vice versa. Also, note that the rotors are marked with a letter A through E on the gear side. This indicates a more accurate weight of the rotor within a series, so if you are replacing rotors you want the letters of each rotor as close as possible to each other, no more than 2 letters apart. The 86-92 eccentric shafts are all the same.

Engine builders like Atkins, Mazdatrix, Racing Beat, Rotary Resurrection, etc., sometimes have some good used parts hanging around the shop that they would be willing to sell. It wouldn't hurt to make some phone calls to see if you can avoid mortgaging your house for new parts.