Who's the best at Cylinder head porting

If it's just a polish how do they match the flow on a flow bench? In my understanding the polish is not nearly as important as the port because of the boundary layer of air. True the polish will help but the difference in smooth and smooth as glass is negligable.
 
TheBigNasty said:
If it's just a polish how do they match the flow on a flow bench? In my understanding the polish is not nearly as important as the port because of the boundary layer of air. True the polish will help but the difference in smooth and smooth as glass is negligable.
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I'm just going by what I have heard previously. The guy that posted about it hasn't returned to this thread I guess.

I disagree with your statement regarding the boundary layer. If you port a head, the velocity is going to drop due to the larger volume. The whole idea behind the polish is to keep the velocity up. If you leave a rough surface you are going to have a larger boundary layer than if you don't polish it. Think about what velocity profiles look like for solids of different surface finishes.

Another bonus with the extrude hone is the fact that you can get that everywhere in the ports...not just where the tool can reach.
 
No thanks on the raymac stuff, and ZZ is sipping that purple drank with those kind of prices!

WTF is the deal with these companys charging us such a a$$ load? Is it cause they know how much stupid money we spend on parts that cost $60 and we get charged $600 for the part!

8+ hours on a head :hehe: If anyone is porting and polishing your head and they took off 12lbs of material in 8hrs U NEED TO FIND SOMEONE ELSE!

I've got a bad a$$ guy that is a supreme engine builder and polisher, but he caters to the guys who don't have the bank roll! Has been doing this for a long time and started back in the day with his hot rods Belairs and such, he spends 8+ hours just getting his tools clean for the job :hehe: can't beat the price either. Been a role model for me since I was like 7 with all this racing junk.

I'm suprised more people don't look past all these high price diesel shops and go to the guys who have been porting since before most of our diesel guys thought they had a race truck cause they put out 600hp!
 
First of all.... Care to share?

Anybody that's played this game knows when the word diesel is attached anywhere to the part the price quadruples. Just the way it is for now until someone who knows how to get the stuff and is WILLING to not make an astronomical profit margin shows up.

As for the polish necessity.. I'm going to have some p&p work done to my 12v head and will try to get before and after polish numbers, but it will be a bit because I'm broke for now and the motor has yet to come out of the truck. If anyone wants to offer numbers or wants to use my head to do it feel more than welcome! :cheer:
 
I'd say for the people who haven't been in the diesel game long the parts and performance for them is still quite expensive and rediculous,

for anyone that has been dabbling in this stuff for a serious amount of time knows where to go and not get there a$$ handed to them.

I'd be more than happy to get you his # and get you a good high flowing P&P job.
 
Just curious to see the difference in cfm between a smoothed surface vs a polished surface.
 
As J-Rod said the Extrude hone process doesn,t really remove material just polish and IMO not very good at that.They push the abrasive media thru from valve side (pretty much wipeing out the stock seats).The valve bowl gets polished to mirror finish ,but as it enters the runners it looses resistance and does practicly nothing as media exits the head.Oh and it cost BIG $$$$ for what you get!
Not great pics but

valve.jpg


head1.jpg


port.jpg
 
The Extrude Hone process is costly. The best route if the Extrude Hone process is planned, you would use the extrude hone as a final process on your port work. In other words you would be sending them a head(s) that has already been rough ported and shaped, this would be the polishing process. The end result will benifit with the head you send them. If you send an unported head, don't get excited when you get their finished product not meeting your expectations.......
 
i just a quote today for port and polish ,valve job and back cutting the valves for 1200.00 .. and thats all ....
 
Extrude Honed

j-rod said:
Did you have it ported and then extrude honed or just extrude honed?

I have also heard good things about this process with the tractor guys.

What did they charge? PM if necessary.
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I didn't have it ported. I had it Extrude Honed instead.

See PM
 
So does anyone here play with their own head? I have to have mine off in the next work for head gasket replacement and O-ringing, I was entertaining doing a port and polish myself. Im pretty handy with a die grinder, and have plenty of patience. If I had the dough I would have it flowed but, just the gaskets, and machine work will wipe me out for now.
 
I've got a spare head so I'm gonna do some porting and polishing myself.

HIGHLY doubt it will see a flow bench though...
 
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