Alright, i tried searching a few times, but it was taking way too long... (search feature broken? i tried like 3-4 times waited at least 2-3 mins each time..)

I was considering porting my S4 N/A. The reason im considering just porting my N/A is because i only have 42k kilometers on a mazda factory refurbished engine, and i doubt even a moderately complete donor TII car would still be rediculous amounts of money here.

So, is there big benefits from porting an S4 engine? Also will i need to do any fuel mods or anything like that? The car is completely stock, other than straight through exhaust to the 2 oem mufflers.

Also, would it be adviseable to do the porting myself? I have never done engine porting, but i think i could pull it off. Is it really worth tracking down some bum parts to practice the porting on?

 

I think your best bet was to find a core motor and practice your porting on that and build it up. Your reman is so new, it would be a waste to crack it open. Keep your reman as a back up engine while you do your porting on a core. This way you limit your downtime.

 

Find junk housings to practice on first. You don't want to trash good housings. And I agree, don't open up the reman to port. You want to port when the motor is already open.

 

Porting is one of those things where some people just have a natural skill for it, most think they can do it and just skrew up stuff.

For instance I ported some heads for an engine and took them into work and our cylinder head guys thought that I had on the job experience doing it because they looked great and where ported in the right places.

My roomate who has built more engines than I and has attempted more porting work can't cut something smooth for the life of him. Everything I've seen him port he's quit early while it was still fixable and had someone else professionally finish the job, lol.

It only takes one slight slip of the hand to make a mistake which may not be fixable and if it is fixable you are more likely to make more mistakes trying to fix it.

You can hone your skills on practically anything, find a piece of scrap aluminum or iron pipe and try making the I.D. larger while still keeping it perfectly round and as smooth as possable. If you have something that is junk and has like a 1/4" thick flange on it or any structure which you could recut an opening practice on that, draw a pattern on one side of it then a different pattern on the other and try cutting each side to the pattern while blending it in the center. The first thing I practiced porting on was a scrap water pump housing, it had a passageway in it that was about 3/8" wide and 4" deep and I ported the whole thing about 5/8" wide and as close to the same shape as I could. I completly destroyed 2 of them before having the 3rd one look pretty, then I practiced on a scrap cylinder head and destroyed half of the ports before getting the touch to blend one good enough for a running engine.

 

porting on an n/a will net you around a 10% gain in horsepower, at 160 stock HP that is a 16HP gain. is 40+ hours of labor and $700+ in parts worth it for 16 HP? you can gain that by intake and exhaust mods or a simple standalone and tuning for roughly the same price and probably see better gains.

porting a prefectly good engine would be the last things you should consider doing for power mods.