DAMN!!! You need practice man, but good luck! it's not easy being good...and I'm still not that good.

 

Heres a pic of my exhaust port if it helps anyone.

 

You need to use a straight edge, both pins installed and mark at the top of the bottom pin!!!!!! and for Christ's sake remove the sleeves also!!!!!!! If you do not do it right you will **** up the timming.

 

Thanks for the pic's. I'll be keeping the sleeves in. Is the timing that different from stock right now?

 

My theory is that if your going to port an exhaust right you need to pull the sleeves and get serious about it. This half way stuff doesent work very well.

1fastT2, yours look realy good, you did and excellent job on those,very clean and faired together. Did you notice a big difference in performance from before when it was stock? Also did you use a template or just do it naturaly?

 

1FastT2,
It looks as if you didn't port the top at all? How does that run? Any differences and reasons why you didn't port the top? I noticed all the other pics on the thread the port is rounded and ported around the top.

 

Thanks for the compliment. I really can't tell how much more performance I gained from that port because I added a Haltech, 60-1 turbo and big FMIC at the same time. I'll tell you though, its fast! I did alot of researce before I did my own port work by looking at different ports and doing alot of reading. I started out with a RacingBeat template and kinda did my own thing with it.

 

I in fact did not touch the top of the port at all. I didnt want any over lap in the timing and was also told not to port the top of exhaust port in a turbo charged application. However I dont think that hold true for an N/A car. The car runs great but does have a little bit of a lop to it mostly from the intake port though.

 

1fastT2,

For your research, if you remember off-hand what sources and people you talked to? It seems like I talk to ten different people and get ten different anwsers.

Anyone else?

 

I dont exactly remember where I got all of my info. Everyone has there own theory on porting. I basically compiled all the info I had and made my own theory. Its best just to do as much reading on it as you can get your hand on and go from there. Let me tell you its not as much as an exact science as everyone make it out to be.(exhaust port speaking)(I know im going to get flamed for that.) Don't get me wrong every little bit of material thats removed will have its affect. Its mostly trial and error. I have, im my eyes quite a small port due to the fact if I would have made it any bigger it would have slowed down the volicity of the exhaust gasses making it harder for me to spool up my turbo. Just do your research and you will be fine.

 

Ya i completely aggree with you. Every one has there own style and there is no one right way to do it. And ya that doesn not hold true at all to NA aplications in reguards to only porting the bottom. Whenever you see a port that only goes down or just a little up and mostly down its always going to be for a turbo in order to avoid intake and exhaust overlap. Not that there can be overlap and still run but its not preferred by most.

CJG

 

what kind of boost your running also has alot to do with what port you use.. bringing the port up increases overlap and you loose a little low end but gain top end... going out on the sides seems to make a pretty good diffrence though.. you don't srew with port timming, but there is way more surface area for the exaust to escape... I'd be the equivilent of running slightly better than stock cams with much larger valves on a piston engine...

 

Great comments guys, lots of great info in this thread. Just for clairifcation, This is a N/A 6 port 1990 motor, using turboII rotor housings. Thanks again for all the great comments. Anyone else, please feel free to add more!

 

what should i use when porting? Dremel or saw bit?

 

A dye grinder works the best i think. But a dremel should do the trick if you get some carbide bits. Also get some grinding stones & sanding bits.