Sorry to be such a newb..

The reason i ask is because as im sure most of you have seen, i had my MREV2 polished..
Appearently i should not have polished inside the runners, or at least not all the way through..

And then i read this thread:
https://my350z.com/forum/engine-and-drivetrain/148144-what-it-took-me-to-get-mid-13s-in-the-1-4-mile-n-a.html

Zixman: I then removed the lower plenum. I used the 36x grit drum to knife edge the intake ports and to remove all casting flaws. I then followed up with the 120 grit flapper and polished all the ports as smooth as a babies a**.




g356gear: This is a bad thing!! The intake ports should NEVER be polished...EVER! They should have a minimum 80 grit rough surface going down into the cylinder head. Port and gasket matching will help performance but polishing intake runners is a huge mistake. This kills the fuel atomization and mixture as it enters the combustion chamber and causes fuel pooling and all kinds of problems associated with a dirty and incomplete combustion process. This includes the entire lower manifold.


Zixman: Only *after* the point of injection....

The correct term for that phenomenon is "reversion" and it is caused by the fuel and air seperating because the fuel sticks to the smooth surface. This leads to a potential lean condition. The polishing work I did was pre-injection point (done before the point of fuel being injected). I know pictures would be worth a million words...

So yeah..Where is the injection point so i can sand it down right after the injection point!!