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porting the cilinder head
Posted: Sun Feb 10, 2013 3:10 pm
by 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
Re: porting the cilinder head
Posted: Sun Feb 10, 2013 11:32 pm
by ilya
sorry. what is "whize" ? i think u need port only intake side and polish. Exhause side is allredy good. for 115 BHP
Re: porting the cilinder head
Posted: Mon Feb 11, 2013 10:39 am
by mr kawa
I ment smart with "wize" haha
Re: porting the cilinder head
Posted: Sun Feb 17, 2013 7:20 pm
by 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.
Re: porting the cilinder head
Posted: Sat Feb 23, 2013 12:44 am
by 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 %)
Re: porting the cilinder head
Posted: Sat Feb 23, 2013 9:58 am
by mr kawa
Is there somebody with a picture of their porting work before and after. Thank you all so far for the info
Re: porting the cilinder head
Posted: Mon May 13, 2013 9:09 pm
by 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.
Re: porting the cilinder head
Posted: Mon May 13, 2013 11:25 pm
by BETEK
mr kawa wrote:
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
Re: porting the cilinder head
Posted: Fri May 17, 2013 11:54 am
by icarus
mynameisowen wrote: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.
Re: porting the cilinder head
Posted: Mon May 20, 2013 5:04 pm
by mynameisowen
Would You care to explain why this is the case he doesn't mention anywhere why he does the things he does.