Port & Polish P72-1 Head

[kasperwhoo]

I was going to do my own port & polishing to my head and I was wondering if I can go this far with the porting!

Or leave some metal in the flow of the port!

Or will I have to stay with the guides as much as I can w/ some fabrications to both guide and port!

Let me know from experience!

 

[Rich777]

Get it done by a pro or don't bother. The thing with porting it can look nice but preform crap and the other way round, look crap preform good. It really is a art/science that requires a lot of practise and knowledge. You could easily end up with a head thats causing your car to run crap... Trust me

 

[tama666]

Get it done by a pro or don't bother. The thing with porting it can look nice but preform crap and the other way round, look crap preform good. It really is a art/science that requires a lot of practise and knowledge. You could easily end up with a head thats causing your car to run crap... Trust me

2x, this is best left to those who know this art well.

 

[waff]

x3

In the port, polish and flow cylinder head science (as well as other parts, including 2 stroke and rotary engines), nicer doesn't mean better. Sometimes yes, as tama666 has said.

Sometimes some heads has very big ports from factory, and then we go and port more... = crazy low velocity ports...

To know very well what are you doing, flowing knowledge and flowing test tools are a must.

Without these tools, the most you can do is a primary semi-polish. That can consist of a debug of the roughness in the original cast. Then the original dimensions of the port are not altered, and stock flow is a sure and smart point to start the following steps for the future.

And yes... true, you can find that sometimes a changed port (alteration of its dimensions) can be a good performance change. But without testing tools, it will be matter of luck.


Anysay, I can say your work seems very nice to my eyes.
I am sure that with a good mapping and other bits it can be nice head.

Dani.

 

[tama666]

Anysay, I can say your work seems very nice to my eyes.
I am sure that with a good mapping and other bits it can be nice head.

Dani.

I dont think that the work in the photos are from kasperwhoo.

 

[kasperwhoo]

I dont think that the work in the photos are from kasperwhoo.

LOL only you would hate! But on the flip side I was woundering if I was to delete that hump and the valve guide in the first pic would it be the best port to do or would the hump and guide not matter in the flow path. I kinda had it in mind that the hump has something to do with the direction of flow to the valve then the flow out to the combustion chamber!

 

[tama666]

LOL only you would hate! But on the flip side I was woundering if I was to delete that hump and the valve guide in the first pic would it be the best port to do or would the hump and guide not matter in the flow path. I kinda had it in mind that the hump has something to do with the direction of flow to the valve then the flow out to the combustion chamber!

I don't hate anyone, kaspewhoo. That would be a character flaw.

Good question on the valve guides tho. I would think that the extension on the valve guides provide some sort of function; valve stem support maybe?

 

[Rich777]

LOL only you would hate! But on the flip side I was woundering if I was to delete that hump and the valve guide in the first pic would it be the best port to do or would the hump and guide not matter in the flow path. I kinda had it in mind that the hump has something to do with the direction of flow to the valve then the flow out to the combustion chamber!

You may benefit from it or you may not... All the rest of your setup will play a BIG part. You really need a pro's opion on this kasper as you could easily end up wrecking your head. If it was me and i lived over there in the US i would send it straight to Endyn.

 

[Vtec6000]

Just clean up the ports and leave it at that. Removing any cast marks is fine and making the surface smooth just don't go removing lots of material if you don't no what your doing .

 

[waff]

Caution with the valve hump. It can be ok or it can mean dead. It depends on your whole set up. Generally it shouldn't be deleted or eliminated, just worked. It is the first part of the section of high pressure in the port.

And the valve guide extension also has its own story... It also depends.

On of the laws of modifying things like ports is: Do it a bit, test and analize.
If you can again, do it a bit more, test and analize again... again, again...


I repeat as Vtec6000 says, remove cast imperfections and work texture.
Just working textures also makes ports larger by some tenths. And some tenths in the world of porting marks the difference...

 

[Darragh]

I had great fun before messing with a mates d-series head .. port and polished , enlarged chamber , shortened guides and reground valves! but IMO I wouldnt touch the intake port on a b series head its too sensitive for a D.I.Y'er but I would polish /match port the exhaust side , you cant really go wrong there.

 

[waff]

I dont think that the work in the photos are from kasperwhoo.

True, I didn't read his description correctly...
And I also noticed that valve gides were very well worked (they needed to be removed too) without correct methods.