Port and Polish, please help

[MaximusGTR]

Port And Polish????

Does anyone here have a port and polish done, and if so what are the results?, This guy I know that does engine work said he ported the heads on someones Max. Would this be a waste of money or would it give these cars serious gains???

[bk2kmax]

Originally posted by MaximusGTR
Port And Polish????

Does anyone here have a port and polish done, and if so what are the results?, This guy I know that does engine work said he ported the heads on someones Max. Would this be a waste of money or would it give these cars serious gains???

I once read something on this, I think it was in Superstreet or one of those mags I read. They were doing a port and polish job on the old Z engine, I don't recall any specific gains from it.
What it supposedly did was allow the water to be circulated in various parts of the engine in order to allow better cooling, it also removed a lot of the original casting and flash that was embedded in the engine when it came from the factory.
As far as hp gains or anything like that I can't say. Overall though I would say that the engine's life is extended and it's overall durability is improved especially if you are going to be adding some type of boost, ie, Turbo, SC or n2O.
I hope this helps, just my 02.

[crewchief264]

a port and polish job involoves removing the heads, valves and the like in the heads. when your porting the heads you take and match the intake runners with the heads. after you've smoothed the lines you then move into the area right behind the valves( where the air and fuel flows) and enlarge this area and blend into the runner. If your really anal about porting it you then move into the area in the combustion chamber and smooth this out so that you have a clean burn when the spark plug ignites. your biggest gains from porting are only in the high rev range, which unless your motor is blown or you strictly race it it's really not worth it. plus you can port your heads yourself with a die grinder and a good abrasive kit like one from summit racing. expect to spend plenty of time on each head about 6-10 hrs (beginner) on sm block 350 heads. have fun and remember to b carful and not take out too much. really careful. and you dont want to hit your valve seat area either. alot work for a little gain.

[MaxPayne]

http://www.extrudehone.com/

that is all.

[bk2kmax]

Originally posted by MaxPayne
http://www.extrudehone.com/

that is all.

Yeah, there you go MaxP, I couldn't think of the term for this to save my life (extrudehone). Some good info on that link, I appreciate that it supports what crewchief and I said.
Thanks

[MaximusGTR]

Thanks guys, nobody answered this question a couple of months ago when I first posted the thread. See I port and polished the heads on my Chevy Beretta that I had in Highschool and it gained alot of top end pull. I figured it would do the same for the Max, if not better. Anyway thanks for the response

[MaxPayne]

I think port and polishing the Maxima engine is pretty much worthless for the money you spend because they did such a good job in the design to begin with. The Extrude Hone process just smooths out natural flow passages, polishes them, and makes them slightly larger, but interms of actual ports mating at the heads, I think they are already well matched, which is the purpose of Porting and Polishing.

[bk2kmax]

Originally posted by MaxPayne
I think port and polishing the Maxima engine is pretty much worthless for the money you spend because they did such a good job in the design to begin with. The Extrude Hone process just smooths out natural flow passages, polishes them, and makes them slightly larger, but interms of actual ports mating at the heads, I think they are already well matched, which is the purpose of Porting and Polishing.

I don't think I would say it's worthless based on what I read it did allow the Z engine to gain better cooling which therefore allowed for a higher Turbo or boost application in the modifications that they were doing to the engine.
But you are absolutely correct as far smoothing out the natural flow passages. The superstreet article stated that one or the rear bank of the V6 in Z wasn't getting any waterflow to that area which would allow it to cool better and when they had ported and polished/extrude honed the areas that needed the water it promoted better cooling and therefore the engine was strengthened.

It does promote some gains in hp because of the higher applications or more stress/boost you can apply now that the engine's internals have been ported/honed to allow better cooling. The process in itself isn't like a turbo you drop in and you see the numbers right away, it's more like it's just a part of the overall equation.

[MaxPayne]

But overall, if you're not boosting, its not going to be that significant of a gain. You get more gains from using a drop-in K&N air filter.

I agree its more of an "overall performance" thing and would be up there with lightening the pitons and conrods (which Maxima did to the VQ for 2k and 2k1 models for the 222hp) and knifedging the crank counterweights. None of these things is significant in and of itself, but when put together with other high performance mods, there are benefits.

I'll put it this way... unless you have money to burn for firewood, porting and polishing a Maxima's heads isn't worth it. You might as well do a trade in with a 2k3 Max and get 255hp stock. There are many more mods that will net higher gains than porting and polishing that should be done first, namely an intake, Y-pipe, and a MEVI.

[bk2kmax]

Originally posted by MaxPayne
But overall, if you're not boosting, its not going to be that significant of a gain. You get more gains from using a drop-in K&N air filter.

I agree its more of an "overall performance" thing and would be up there with lightening the pitons and conrods (which Maxima did to the VQ for 2k and 2k1 models for the 222hp) and knifedging the crank counterweights. None of these things is significant in and of itself, but when put together with other high performance mods, there are benefits.

I'll put it this way... unless you have money to burn for firewood, porting and polishing a Maxima's heads isn't worth it. You might as well do a trade in with a 2k3 Max and get 255hp stock. There are many more mods that will net higher gains than porting and polishing that should be done first, namely an intake, Y-pipe, and a MEVI.

I agree 100%, amen my brotha. For the money I'd definitely go with the Y-pipe first and then probably a lightweight UDP, the MEVI is really of no gain to us 5th Genners, although I do see how it helps 4th genners.

If I had that kinda cheese and I was about to do some boosting to the Max I would definitely go with the port and polish, if for nothing else other than the durability factor it adds to the engine's overall lifecycle.
But thanks MaxP, you really put it down though, you know your schnik.
Peace out

[MaxPayne]

Rock on till the break of dawn :ylsuper

[MaximusGTR]

How much do you guys think a port and polish would cost on a 4th gen? I had it done to my chevy beretta and it gave major gains to that car, but I know you can't compare a beretta to a Max, but when I had gotten my engine rebuilt on the beretta, they ported and polished for me because My dad knew the guy from work. So in other words, I didn't pay for it

Man guys I havn't been around for a few days because 2 asshole Mods banned me twice for some drama in another topic forum, but the Mod God Igor bailed me out twice and is doing an investigation. So Maximus is back baby

[bk2kmax]

Originally posted by MaximusGTR
How much do you guys think a port and polish would cost on a 4th gen? I had it done to my chevy beretta and it gave major gains to that car, but I know you can't compare a beretta to a Max, but when I had gotten my engine rebuilt on the beretta, they ported and polished for me because My dad knew the guy from work. So in other words, I didn't pay for it

Man guys I havn't been around for a few days because 2 asshole Mods banned me twice for some drama in another topic forum, but the Mod God Igor bailed me out twice and is doing an investigation. So Maximus is back baby

Welcome back Maxi, I was wondering what happened to you, sorry but I don't know the answer to how much it'll cost you, but I just wanted to say good to have you back bro.