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Port and Polish 

 

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 Post subject: Port and Polish
Posted: Thu Aug 23, 2007 10:34 pm 
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Since buying my writen off EF I am tossing up weather to do the head up and put it in my car, and one of our mechanics said porting and polishing is easy you just need a di grinder, is that true or should i get it done by pro's

 

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Posted: Thu Aug 23, 2007 10:44 pm 
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It is easy in that you can make ports bigger with a die grinder.

However, doing it in a way that will actually lead to more power does require research. There are some good guides on the net explaining how to go about it. I suggest doing a lot of reading and then go ahead if you feel comfortable with it.

 

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 Post subject: Re
Posted: Thu Aug 23, 2007 10:49 pm 
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and where can I research that?

 

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Posted: Thu Aug 23, 2007 10:50 pm 
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google

 

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Posted: Thu Aug 23, 2007 11:10 pm 
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Have anyone of you have heard of high velocity port job? :wink:

this is were all the car makers are slowly heading.

 

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Posted: Fri Aug 24, 2007 12:12 am 
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you really need to have access to a flow bench to achieve maximum potential from cylinder head porting,see the pros
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Posted: Fri Aug 24, 2007 1:21 am 
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Agree let the pro's do that.

 

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Posted: Fri Aug 24, 2007 2:52 am 
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nothing wrong with just giving it a cleanup, bit of match porting etc is there????

 

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Posted: Fri Aug 24, 2007 11:08 am 
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hot-04l wrote:
you really need to have access to a flow bench to achieve maximum potential from cylinder head porting,see the pros


Yes but if your going for maximum potential you will need a degree in fluid dynamics as well.

The truth is that most pro's wont flow street heads unless the customer asks (and pays) for it anyway.

 

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Posted: Fri Aug 24, 2007 7:04 pm 
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Here's a head that I did myself. It takes a lot of time and know how. Yes, port matching is benificial, but you gotta know how to do it in such a way that no matter how many times you take the inlet manifold off, it always goes on in the same spot no matter what. Same for the exhaust.
Otherwise your wasting your time.
You need more than just a diegrinder, you need the right burrs for it, flapper wheels, polishing tips & compounds, and know where to remove metal, and where to leave it be and smooth it over.

 

 

Attachments:
My EA88 cyl head, ex ports..jpg
My EA88 cyl head, ex ports..jpg [ 436.68 KiB | Viewed 51 times ]
My 88EA cyl head ported & polished. 004.jpg
My 88EA cyl head ported & polished. 004.jpg [ 332.32 KiB | Viewed 40 times ]
My 88EA cyl head ported & polished. 002.jpg
My 88EA cyl head ported & polished. 002.jpg [ 406.48 KiB | Viewed 40 times ]
My 88EA cyl head ported & polished. 003.jpg
My 88EA cyl head ported & polished. 003.jpg [ 334.13 KiB | Viewed 39 times ]

 

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Posted: Sat Aug 25, 2007 12:25 am 
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CJH have you got any flow ratings for that head you done?
I am keen to know how it goes.
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Posted: Sat Aug 25, 2007 12:36 am 
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i'l let you know what kinda flow ratings $1000 bucks gets ya next week when i get my head back.

 

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Posted: Sat Aug 25, 2007 3:11 am 
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cjh wrote:
Here's a head that I did myself. It takes a lot of time and know how. Yes, port matching is benificial, but you gotta know how to do it in such a way that no matter how many times you take the inlet manifold off, it always goes on in the same spot no matter what. Same for the exhaust.
Otherwise your wasting your time.
You need more than just a diegrinder, you need the right burrs for it, flapper wheels, polishing tips & compounds, and know where to remove metal, and where to leave it be and smooth it over.

I agree with everything bar the perfect line up, check the slack with a manifold when u bolt it up... It wont go backin the same spot unless you work it out with pressure, even then you wont be 100%!
Bowl work is the most important part as the std ports are pretty big.
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Posted: Sat Aug 25, 2007 2:55 pm 
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$1000 bux where ya gettin that done at i got 380 hp at 0.500inch lift on inlet and full head reco for $440

 

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Posted: Sat Aug 25, 2007 3:14 pm 
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horis wrote:
$1000 bux where ya gettin that done at i got 380 hp at 0.500inch lift on inlet and full head reco for $440


this one should be over 400 according to him. at 500 it also includes a shave for 10.5:1 , and double valve springs fitted. Its getting done at headsense at coopers plains.

 

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