since no damage occured from misshifting the other night, im going to continue with my plans for the car....im getting cams put in with valvesprings blah blah. i was thinking of going ahead and get my head ported while it was it was off. i have a vague idea of what PnP is, but i would like to verify and then some...knowledge helps...

-could someone explain to me this process?
-what's the difference between 3-angle and 5-angle and whatever other option is left?
-how does PnP aid the engine?
-basically anything i should look for in the shop/machinest.
-anything else you would like to add.

i did do a search so dont flame me for not. didnt find the info i was looking for.

one more Q....has anyone heard of PYR racing heads? do they do quality work? trustworthy? etc.

thanks guys

my setup:
AEM CAI
Skunk2 Mani
Going to add:
CTR cams (intake and exhaust)
Spoon camgears
Portflow inners and ITR outers
Portflow titanium retainers


[Modified by da_rockwilda, 11:54 PM 10/5/2001]

 

i'm also curious about P&P.. what benefits
does it provide? mostly safer performance
is how i understand it to help.

also, does anyone know the benefits of a
Ventuli Plate and has anyone had any
experience with one?

 

I too want to learn more bout PnP.

what's involved, and how will i be affectd?

 

port and polishing is making your head all smoothe and nice so air can travel without restrictions such as rough surfaces. of course you would have to go to a good place to have this done. the machinist or company should go 1on1 with you and ask how you want it, like wut current mods do u have and what are you planning so the machinist can make polish it to fit you.

the 3 or 5 angle job in your valves i dont really know, its related to how your fuel/air comes into your cylinders, some one correct me if im wrong.

here are some places http://www.gude.com (thats where i got mine) http://www.portflow.com
ENDYLN "sorry forgot spelling" alot of ppl like these guys i would recommend them to
PYR is another one
JG

also think about getting your manifold and throttle body p&p while your at it.

 

Porting and polishing is basically the massaging of your intake ports, exhaust ports and combustion chambers, Porting basically means they remove material from the inside of the intake and exhaust ports. Polishing means they smooth them out, there are alot of arguments on how "smooth" the intake ports should be, this is because some believe the turbulance caused by the ruffer ports creates a better air/fuel mixture. On a Honda, very little material should be removed from the ports because the cooling jackets are very close to the ports, Removal of too much material would also lower velocity, which is not good.

3 and 5 angle valve jobs have to do with the angle and cut of the valve seat. On a 3 angle grind they cut 3 angles into the valve seat and match the valves to it, on a 5 angle valve job they do the same but they do it to 5 angles. This can help with combustion chamber sealing, although I believe a 5 angle is only needed for HIGH boost turbo apps.

In porting and polishing there is also the combustion chambers that can be modified, one of the thing to do is to reshape the combustion chamber to increase compression and reduce the quench area, This can work well when done properly, another thing is deshrouding, I am unclear as to what this is and what you gain from it. You can also polish the combustion chambers, this keeps carbon from building up and also makes the chambers look pretty . The rest any shop can explain to you, I prefer to do my own cleanup on the heads, this removes very LITTLE material but leaves them clean and smooth. I also believe the exhaust ports should be as smooth as possible.


[Modified by slowerthanu, 2:29 PM 10/6/2001]

 

I think you should get a header, with a hiflow cat and a nice catback exhuast before you build your head. It will be such a restriction when u build uop the head cuz the exhaust will flow like ****. U will notice alot more power if you have a good header and catback.

 

The previous post is accurate....

PnP normally only sees it's full potential in higher HP apps, especially FI.... It allows a head to flow more smoothly and efficiently, but, as previously mentioned, will decrease velocity with increased flow, which is why it is such a good add on to a FI engine...

Since you are adding cams, springs, etc... a PnP job would be a nice touch and gain a few Hp... especially since the head must come apart anyway *Note a slight reduction in compression from the porting (mill the head 5 thds?). However, you MUST get it done by a very good shop, as an incorrectly done PnP/seat job can REALLY f*ck up your head permanantly.

the valve job allows the air/fuel mixture to have a smoother flow into the combustion chamber, allowing a more thorough filling action in an arc shape.... The higher the seat...the better flow.... 5 seat being superior to 3 seat... 5 seat being closer to a curve and meant for 'race' engines... but it is also done on some higher Hp streetables...

 

i plan on getting a header, cat, and exhuast immedietly after the headwork, i was aware of the restrictions, thanks for looking out

da_rock is getting a JDM header(still deciding which), highflow cat, and Apex-i WS exhuast

 

Good, i didnt know, jdm header is gonna be my next mod. I cant wait to get that sucker. Then a nice set of spoon jdm itr pistons, to get it ready for some toda b's.