shortimr

OK finally getting back to resurrecting my 88 TII. A few years ago I had a link to a site that gave detailed info on the evolution of the 13B rotary. Improvements, differences etc... I have done some searching but cant find it. Wondering if its worth it to pursue a cosmo or FD engine in a S4 TII.

RXeligion

Not in my opinion. I kept my S4 motor, but had it streetported. It was MUCH less complicated than any swap, and there is a wealth of information about cars in OEM trim.

REAmemiya_fan

S4 rotors are the most sought after in any market because of their strength. I remember watching a Japanese video about it once too. I'll try to find it.

shortimr

Yes, please post the link if you can find it,

Thanks

RotaryEvolution

iTrader: (30)

S4 rotors are more durable due to the additional material that wasn't shaved off. S5 rotors are better for engine response.

yes, i have seen S5/6 rotors actually warp for no good reason. i have never seen a series 4 rotor face cave in from detonation or expand from overheating the lubrication system, S5/6 yes they do all of that.

early rotors and late series blocks combine for the best results in building a bulletproof motor.

alec.jones21

I just learned alot off this thread lol im going to search more on the engine differences

k4killer

iTrader: (2)

S4 rotors are stronger, S5 rotors make better compression.

IMO, I like S5 rotors, because, the strength isn't that big of a deal. If you detonate, 9 times out of 10 the rotor is dead anyway. Whether its S4 or S5.

This applies to the turbo of course. Some times you can get away with a small ping in the N/A motors.

BTW:
Pretty sure this was an S4 rotor.

sticka69

thanks for info.

Chris_at_MJM

http://en.wikipedia.org/wiki/Mazda_RX-7

Sgtblue

iTrader: (16)

I think this is covered in the 2nd Gen. Stickys.

All mota rota

Fd swap into a 2nd gen is alot of work, u need to intergrate stock ecu and wireing harness or get a stand alone, fab up new mounts ect.