Port matching

[nismofan14]

I am getting ready to clean up under the engine bay( removing / rerouting lines) and powder coat a spare intake manifold and valve cover. While i am doing this I was thinkin of port matching everything on the intake side to the inner diameter of the gaskets. Any advice or comments by anyone who has done this like power gains and such.

searched but came up with nothing

[TrunkMonkey]

read this.

-demetrius

[nismofan14]

thank you for the helpful info, I thought i read about someone in this forum having done this and getting some good results but couldn't find the post.

[deviousKA]

Thats some interesting reading demcj.

[Ubernoober]

Been lurking for awhile and since this is my first post, I would normally just say hello, and leave it at that. But reading the link irritated me. That link was specific to a Saturn engine. Certainly nothing like a Nissan engine and very little like the classic Ford engines I know well. Every port responds differently to reshaping, polishing, radiusing or port-matching. To generalise and say that all port-matching is a waste is a gross misunderstanding of engine dynamics.In the old Ford 351C (I realise this is an import board... humor me:) please ) there were two heads from the factory. A large-port high-compression head and a mid-sized-port standard compression head. Porting or even simply polishing the large-port head is considered a major no-no for street use. On the other hand, the smaller-port head can benefit from some minor reshaping and a polish. Same engine, two heads. Two different approaches.My point is this.... ask those who are in the know about your specific engine how porting or polishing might help or hurt. Which of course, you did! Sadly, the Saturn article threw us off a bit. A worthy link for the knowledge there, but not applicable to the Nissan.

P.S. Hello! I'm new!

[TrunkMonkey]

But reading the link irritated me. That link was specific to a Saturn engine. Certainly nothing like a Nissan engine and very little like the classic Ford engines I know well.

oh contrair. you'd be very surprised at how much the KA and the LLO have in common.

To generalise and say that all port-matching is a waste is a gross misunderstanding of engine dynamics.

i don't know what happened to my link, but i don't remember it saying that all port-matching was a waste of time. the purpose of the entire article was to help people understand that much of what we sport compact fanatics do to our engines just isn't necessary. i've heard this not from just this article, but from several shops and engine builders.

Sadly, the Saturn article threw us off a bit. A worthy link for the knowledge there, but not applicable to the Nissan.

engines are engines, and what can be applied to one can be applied to another.

P.S. Hello! I'm new!

glad to have you here!

-demetrius

[Ubernoober]

Point taken.I just wanted nismofan to understand that the article was one persons rant (his own words, not mine) on port-matching. If it were such a crime nobody would do it, and yet....