Whats the difference between a N/A 13b and a TII 13b, not talking about the fact that one has turbo and the other doesn't. I'm talking about the difference between the bare engines, why can a TII 13b rotary take more boost than a N/A 13b and why does a N/A 13b have higher compression than a TII 13b?

 

6 port, 4 port

the compression is from the rotor faces

 

Okay, I have a N/A 13b in my 84 and I wanna turbo it and I know I can't run high boost so which would be better a big turbo at low boost or a smaller twin turbo setup at low boost?

 

twin turbo wont be cost effective.


when i turbo mine i'll be using a stock S4 turbo.

 

you can run high boost, although thats just a general term. I wouldn't worry about the higher compression, as long as you tune it right, you wont have to worry.

 

correct. keep your fuel safe...and you'll be a-ok.

 

6 port vs. 4 port, rotors are different in both weight and compression. The TII can take more boost because of the lower compression. The N/A has higher compression to up the horsepower. The more compressed an air/fuel combination is, the more powerful the explosion, creating more HP and Torque. Too much boost on an N/A motor will pretty much blow it to pieces unless it's been pinned. The rotor housings and side plates tend to move laterally against one another when it comes to high boost.

 

a few things Lovintha7 missed.... is the engine an 84? if so its oiling system is not quite as robust as the turbo II, so you will need to do all of the oil mods on it as well as all of the different cooling mods if you want it to live. the "O" ring grooves are cut into the side plates vice the rotor housings (makes no difference, just compatibility problems between years)

the S-4, or S-5 turbo makes a sweet setup on a high compresion motor, if useing the S-4 make sure you port the wastegate to up its flow as it can overboost if not careful.

kenn

 

do a search noob

 

mfwerd