Dragon

Actually the 20B has a extra main bearing on the thick intermediate plate to support the joint in the e-shaft and provide a stationary gear for the middle rotor so it can run the same rpms as the 13B with out e-shaft flex... On the stock 20b block you are limited by the little ex port sleeves so trying to get over 500 hp is REALLY hard on a stock block unless you put in 13b rotor housings or put 13B ex sleeves in the 20B rotor housings. you can also run a 20B at 600hp fairly reliably since your basicly pushing 200hp out of each rotor and that would be about the same stress as 400hp on a 2 rotor. You would however be better off just running the 2 rotor for a while first and building it up with parts that you can change over to the 20B later on like a really good clutch, intercooler, beefed up drive line and good fuel system. If you try to build a 20B to make that much power all at once you will find your self very poor very fast with lots of broken parts..

Jerk_Racer

j9fd3s - Aren't you talking about the 13G used in the 757? I've read that it was renamed to the 20B name. But in it's race form as a n/a engine, it was the 13G.

epion2985

Actually the 20B has a extra main bearing on the thick intermediate plate to support the joint in the e-shaft and provide a stationary gear for the middle rotor so it can run the same rpms as the 13B with out e-shaft flex... On the stock 20b block you are limited by the little ex port sleeves so trying to get over 500 hp is REALLY hard on a stock block unless you put in 13b rotor housings or put 13B ex sleeves in the 20B rotor housings. you can also run a 20B at 600hp fairly reliably since your basicly pushing 200hp out of each rotor and that would be about the same stress as 400hp on a 2 rotor. You would however be better off just running the 2 rotor for a while first and building it up with parts that you can change over to the 20B later on like a really good clutch, intercooler, beefed up drive line and good fuel system. If you try to build a 20B to make that much power all at once you will find your self very poor very fast with lots of broken parts.. [/quote]

you can always switch the sleeves like you said, port the thing OF COARSE!! By asking what hp does it make stock I did not mean i would KEEP it stock. Its rather stupid to try to push it to 600ph stock. I was thinking a nice porting job, good clutch is one of the 1st's in my to buy first list. I really just want to get the fd in my garage and work on it and do it once and do it right sort of plan. I though to buy a cheap non running one for 3-4 grand and use the rest of the money to work on it, but to go straight to 20b as to not waste money on the 13b which will come out eventually anyway.... maybe you are right though, I see where you are comming form with that. i have been reading this forum for about a year, (I only started posting recently), i learned alot about working on rotaries. I have a talent with all mechanical things too, I have no experience though so I can see it would be smart to start slow... this might waste more noney in the long run though, then on the other hand it can be worth it, get experience, get parts, I will loose a few grand in to the 13b though, because its going to come out eventually. Experience vs money... lol... I think I should take experience///

andynogo

The stock 20B in the JC Cosmo made 206 KW (what's that in HP- 250-300?). Apparently. Probably made a little more but not much as they are limited by Japanaese laws regulating the max power of their locally produced cars to 206KW. So about the same as the 13B, but with so much more potential- a friend of mine has a 20B in his car and it is awesome! Love the sound...and...

Robbomaz

I didn't realise we were friends Andy

The big motor is less frantic in it's delivery and has a mountain more torque than a 13B. It will last longer at the 450hp output too, thanks to lower boost/rpm needed to achieve that power.

Realistically though in most street car situations you can make a 13B do what a 20B will, often for less money too!



But once you do three, two just ain't enough