sounds like my ports

 

How does your template compare to stock 20B secondary ports? How about primaries?

 

just wondering how much you would charge for the template as well?

 

I'm in!

 

I would be interested. I've been thinking about picking up the Racing Beat porting template(s), but if you make a template w/ various reference points as you mentioned,...I would definitely be purchasing from you, Judge Ito.

 

BTW, I was thinking about something along the lines of the various "engineering type blueprints" that I've seen. These blueprints show the position of the rotor in the housing, the intake charge, etc. In fact, a picture of what I'm talking about may be in the RX-7 hardcover book by Yamaguchi. (I hope you know what I'm talking about).

 

Do you have to advance or retard the timing at all?How bad is the MPG going to be affected.VERY interested.I see a next winter project already.

 

Could be applied to, 86-91 turbo II engines. 92-99 FD engines. Cosmo 13B and cosmo 20B engines.

 

Yes they would work on a 20B. For the primaries you could still use the template. Just don't port down. Use the template to port the primaries for the opening timing and the closing timing.

 

You just made me think really hard. I could make one template to host the port shape for the secondaries and in that same template I could host the same port opening and closing for the primaries but smaller towards the lower part of the factory port. Basically one template to accommodate both different styles of primary and secondary ports but with the same intake opening and closing of the ports all around.