I'm in a bit of a dilemma as to whether I should port my engine myself or leave it stock. I don't think I can send it to a place to get it ported cause that costs buttloads of money (I'm on an extremely tight budget.... I'm only in high school :P)

I really want to port it too.. I've never done one before, but do you guys think I could do it with a template? I just want to do a Largish-medium intake streetport and a race exhaust port.

 

It is simple Just get some templates and a carbide bit or two.

 

Yeah! Give it a try! If you screw it up, you can walk... after all, you are young!

Seriously, if you're inclined, then go for it. But do your homework! Read the write-ups. Look at the pics. Pay attention to the stories others have told...er, typed.

Check around your area to see if you can find a trashed motor to try it on first! Sometimes screwing up a junk part is the best way to learn!

 

Read this

http://www.yawpower.com/Flow%20Testing.html

Porting is a science, not guess work. Just my 2cents

 

Find some junk housings to practice on....

 

Junk housings are the best way to get used to how the tool and bits work. You may find at some angles the bit tends to jump. You dont need it jumping out of the port and running itself across the housing face. That happened to me a couple times on junk housings I was practicing on.

 

are you rebuilding the engine your self?

 

Granted, I'm too chicken to port my rotary, I have ported intakes and cylinder heads. Just keep one thing in mind.....Patience, Patience, Patience. If it takes five days, three hours a day, so what? Thats better than being in a hurry and accidentally gouging your housing surface. Read, research, repeat. Then do those last three steps again. That said, get some housings to practice on and go for it!

P.S. You may be able to buy an rx7 from a local junkyard or someone down the road that left it parked for a couple years for a couple hundred dollars. If so, and the housings are still good, port them and swap them out for the ones you have. That way if you got the flow wrong and end up with less horsepower you can still go back. Size isnt everything when you are dealing in fluid dynamics. Those intake gasses have inertia, and will flow better with less bumps and direction changes. Good luck, and post back here to let us know how it worked out.

 

yes, eventually, as it has 150,000 miles on it. I don't know if it's nescessary to rebuild though. It runs fine, just the fact that it has 150 thou miles on it... Do you think the rotor housings will still be in good shape after that long?

 

Porting yourself? Sounds like it would hurt.

 

I agree. I would try some EX-Lax first.

 

Seriously doubtful.

 

I don't know why, but I now have the inclination to try ex-lax for carbon buildup...

Should I put it in the tank, or through a vacuum line??

 

Just shove it right up your tailpipe as far as you can reach.

 

 

watch out for backfire !

 

Do you think I will need new rotor housings?

 

Probably but there is no way of knowing until you open the motor up.

 

Not trying to scare you, but I have opened up descent running high mileage engines to find the chrome on the housings pretty much screwed. I went through 5 engines to get enough good parts to put my Bridgeport 12A together.





But as far as the porting goes, this was my first attempt at a bridgeport. It would be advised to at least buy the templates for what port you are going to run.