fcs13

Except for the fact that rotaries only have the 3 moving parts. No camshafts unless you are referring to the Eccentric Shaft as a sort of Cam, then I guess? There are several different port sizes you can grind to. A couple companies sell a template you can buy. I believe Atkinsrotary.com sells one but some people say they are weird about doing business. I have had no problems out of them, in fact I have actually received free corner seals and plugs from them before.



Have you considered flat out not using turbo and staying NA, but porting to Bridge Port or even P-Port and swapping to Carbs? I would imagine with all the talk of a Vega that you are familiar with the way a Carb. works and can set one up effortlessly. You may even consider saving money and finding a 20b to make the power you would get from a turbo. It might even be worth the time to mention something like this to your dad, IF he is as domestic as they come, "no jap sheeit in mah guhrahj" I have heard that for so long from friends it isnt even funny. No offense to you or your dad of course I am actually looking for a '70 roadrunner as a future prospect.



But ah well, just a thought.



-B.

Leetheslacker

i really dont think you can lower compression through porting.



sure you can port into the compression stroke, and that creates overlap, like a bridge or pport does.

but i dont think it lowers overall compression at all.



i boosted a stock na S4 block, and it worked great though. just gotta be careful and conservative with the tuning.

KA Mallender

It's all in the working (aka. reaction/dynamic) compression. The static could be 15:1 for all I care, but as long as the effective compression is lowered enough, it'll run.



Oh, and I've got a few new questions for y'all. (I said there'd be more!)



How much power can the stock trans handle? The rearend? Because my dad has decided to go ballistic around corners with whatever the next project is (He wants to do a turbo quad-four Corvair). Apparently, he doesn't want to spend another 15 years figuring out another engine type, hence the reluctance. Damn DOHC motors... Eliminates the cam problem. Anyways, onward: How much compression do we get from filling in the dishes? (As in leveling them with the surface, or at least near it)



Curious. And how far up CAN we port into the compression stroke? I just got to know.

Leetheslacker

go read all of the engine building forum, you'll learn a lot.



rotaries are different animals. you dont just go filling in this and cutting up that. and applying piston motor techniques thinking that it should work..



just forget what you think will work, and read up on what will.

Baldy

Paul Yaw articles. Read, learn.

rowtareh

You are thinking too much piston, and not enough rotary. Rotary is a baby engine compared to ANY piston engine, so your R&D is not as wide as pistons are.





Read anything by Paul Yaw, or the Engine Building section of this forum, there is alot of information.

KA Mallender

A'ight, I need some of that research schtuff anyways to help throw my old man over the edge.



Thanks.