Jump to content

Porting and Polishing


SmoothSteve3

Recommended Posts

Hey everyone-

 

Ok, I'm the first to admit that I'm VERY naive about internal engine work (probable because I've never rebuilt one). What is meant when people say they are going to port and polish their intakes/valve heads? The polish part is pretty self explainatory, but what about the porting part? Are they just making the intake holes bigger? or what?

Thanks!

 

SmoothSteve

Link to comment
Share on other sites

Another method used is to scribe the opening of the gasket on the both the intake and exhaust ports of the head. The opening is then enlarged to the size of the gasket to allow maximum airflow. This enlarged opening is then blended into the original size of the runner for about an inch or so into the head.

I have also heard that the intake runner should be kept a little rough, to keep the fuel/air mixture mixed. This would only help on a non port injected engine though :wink:

Also, the combustion chamber can also be polished to slow down the accumulation of carbon deposits, and to avoid hot spots on the head that could lead to detonation.

I've never personally done any of this; I have only seen them done on a race car that someone I new built. (it wasn't a w-body....sorry)

I hope this helps....maybe someone else will have something to add also.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...