postert

Hello,

Can some one help me with the port timin?

I build n/a 13b engine with Peripheral Port. My target is 300hp

I found these timings, what you think?
Mazda Factory Peripheral Port:
IO 86� BTDC
IC 75� ABDC
EO 73� BBDC
EC 65� ATDC

IO = Intake opens
IC = Intake closes
EO = Exhaust opens
EC = Exhaust closes

Can some one tell me good serious racing timings?

I apologize for the bad english language.

Please send pm or answer here.

diabolical1

iTrader: (3)

well, RB claims their housings can achieve 300 and from what i've read they're a little softer on power than the MFR housings, so theoretically if you use the MFR timings to build your housings, then you should achieve your goal.

if you're looking to go with custom timings, then i'm not sure how much help you're going to get on the forum. you will probably end up having to find a rotary engine builder that you can contact personally and then discuss it from there.

have you seen this?

https://www.rx7club.com/rotary-car-p...144200/page10/

postert

Yes i have seen. thanks anyway

i send e mail to racing beat. maybe they can help.

iI found a few timings on the Internet.

Turbo Peripheral Porting - Xtreme Auto Parts

postert

Here is what i find mfr housings timing and port area, to the left on the graph volumetric efficiency: