porting the cilinder head

[mr kawa]

now i have been reading several topics.
I know that its not whize to port the intake side to the gasket. Maybe make it wider but thats it.
But what about the exhaust side. Can i port them to the gasket and give it a good polish?

Gr luuk

[ilya]

sorry. what is "whize" ? i think u need port only intake side and polish. Exhause side is allredy good. for 115 BHP

[mr kawa]

I ment smart with "wize" haha

[mynameisowen]

You can't really go wrong with gasket matching, no use in having an obstruction in your airflow. Any more though and you need to know what you're doing to a reasonable extent.

[novaksaotome]

it's a good idea to not oversize the ports, specially for NA applications, too big of a port reduces airflow velocity. In port & polish the exhaust side is the most important. On honda heads the biggest gains are found in the valve side of the port not in the gasket side (about 80 %)

[mr kawa]

Is there somebody with a picture of their porting work before and after. Thank you all so far for the info

[mr kawa]

i have another question,
are the aftermarket Valves (like OMI-high preformance) that are for d15-16 also going to fit (plug play) for a stock d14 head? same goes for the springs.
im not sure to go for the retrainers sins i dont think they are the parts that are going to have a hard time.

[BETEK]

are the aftermarket Valves (like OMI-high preformance) that are for d15-16 also going to fit (plug play)

Yes

only some exceptions are there if remember correctly d15 3stage vtec and civic gx (natural gas) have other valves

[icarus]

You can't really go wrong with gasket matching, no use in having an obstruction in your airflow. Any more though and you need to know what you're doing to a reasonable extent.

The step is there for a reason...

http://www.theoldone.com/articles/d16a_head/

intake

The entry has been enlarged by approximately .020" all around, to make sure that the exit in the manifold runner is smaller, creating a step to fight reversion.

exhaust

This is assuming that the flange entries are of stock Honda gasket size. Note that the port exit is just a bit smaller than the scribed shape. This will insure that there will be at least a .070" step at the top and bottom of the port and .040" on each side. Making sure that there's such a mismatch is essential for best performance.

[mynameisowen]

Would You care to explain why this is the case he doesn't mention anywhere why he does the things he does.