the 20b rotors are bigger then 13b rotors right. So I guess going by rotor count is not a good way to estimate hp on a rotary. While on this what is the hp on a 20b?



And how much hp is the 13b?

The rotors are the same between the Cosmo 20B & the FD 13B-REW.

yah theres 3 rotors in a 20b and 2 in a 13b.



mike

how much hp does 13b make? 20b?

Asking stock numbers for 13b and 20b?

Which 13b, and remember 20bs have smallish twins like 13brew's do and were auto only.

I meant on the 13b and 20b engines alone stock with no turbos, how much hp do those engines put out?

you need to refine your question



a 76 13b makes 128hp stock

an 89 13b na makes 160hp stock

the na 20b makes 450ps stock but the only non turbo 20b there ever was is the race motor



mike

[/QUOTE]but the only non turbo 20b there ever was is the race motor[QUOTE]



lol, I wouldnt want an na 20b, no turbo is no fun ^^



I am planning on doing a swap to a 20b and wondering if it will justify the cause, 400+ hp stock justifies it VERY MUCH. That and a nice turbo and you are rolling 600-700hp, that and and insane turbo and you can probably hit 1000+ hp. I know it wont be cheap but it feels to me the beast is worth it ^^

but the only non turbo 20b there ever was is the race motorOK, now I see what your getting at.



The 20B twin turbo did make a bit more HP stock then the 13B-REW, but not by much.



The 20B also has a 2 piece e-shaft which means it will flex more at high RPMs & high boost. This can be compensated for but that means a full rebuild with machine work.



600HP from a stock 20B is asking for broken apex seals IMO. 450 should be easily attainable for someone who knows what their doing.



The 13B-REW is a nice engine, & IMO can support 450 crank horse power as well. You wont get as much low end torque, but it's a direct fit & is less to build...