Porting Discussion.

[ae95- wagon kid]

Hey fellow rollaclubers.

 

my friend and i started porting a cylinder head for the first time using tips sourced off the net and in books.

 

so far we have only done one port as per picture bellow.

 

does anybody have any tips they can share, any methods that worked best for them.

 

i just wanted to hear people opinion on porting and if they think it is worthwhile of the hours and hours it takes.

[Trev]

Don't take too much out as you can't replace it cheaply, try not leave dips/ruts and points in the surface, give the port separator a bit of a smaller profile as well.

[Andy43]

You need to understand squish and swirl.

And Bigger is not always better. opps typo now fixed :-)

Edited March 22, 2011 by Andy43

[oh what a nissan feeling!]

^^^^what he meant to say is bigger is NOT always better.

 

definately worth the hours and hours if done right.

[Andy43]

^^^^what he meant to say is bigger is NOT always better.

 

definately worth the hours and hours if done right.

 

Thanks

The boss was coming so I needed to exit quick

LOL

Andy

[ae95- wagon kid]

I have read up on what to do

 

spent 6 hours on the one port.

 

still not done

 

will post update pictures.

 

cam is coming soon will post pics of that installed.

[Boosted]

I've found it easier to attack all ports at once and keep switching between them. Personally have found it easier to keep port sizes the same that way. Keep away from the short radius, most of your work will be in the top of the port. If it's a race motor, get rid of the guide, it only slows things down. Tuliping the valves can aid flow, most of them are pretty poorly cast around the exposed stem (don't get too excited with 20V valves though)

Match porting to the inlet/exhaust gasket is really worthwhile and then match port the manifolds to the gasket as well.

I've never seen huge work done on 4AGE or even 3SG(T)E heads they tend to flow pretty well and it's mostly about cleaning them up a bit rather than radical port shape modification.

Definitely worth it. If you've spent most of your engine build budget on the head, you'll probably have a pretty decent motor.

[Andy43]

We always port match the inlet and have a step on the exhaust.(.i.e. the exhaust port is smaller than the extractor / manafold )