Port & Polish to a mirror finish
Port & Polish to a mirror finish
(OP)
Hi gentlemen I had just recently completed a port and polish on my 1.8T 5v head. I ported both intake and exhaust and only mirror polishing the chamber and exhaust ports, the intake ports are to scotch brite/satin finish.
I'd appreciate any comments or insight on having such a surface finish involved in the combustion chamber. My intitial intentions were to decrease hotspots caused by carbon build-up and to create smoother surface for better flame propigation.
Here are some pics of the work...Thanks in advance :)






The Intake ports will remain a #4 finish.

Next are the valve faces and a 3 or 5 angle valve job...should be good =)
I'd appreciate any comments or insight on having such a surface finish involved in the combustion chamber. My intitial intentions were to decrease hotspots caused by carbon build-up and to create smoother surface for better flame propigation.
Here are some pics of the work...Thanks in advance :)






The Intake ports will remain a #4 finish.

Next are the valve faces and a 3 or 5 angle valve job...should be good =)
RE: Port & Polish to a mirror finish
RE: Port & Polish to a mirror finish
~Matt
RE: Port & Polish to a mirror finish
RE: Port & Polish to a mirror finish
RE: Port & Polish to a mirror finish
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RE: Port & Polish to a mirror finish
~Matt
RE: Port & Polish to a mirror finish
If in fact you are interested and want to save the time and money on getting supplies. I suggest you look into www.gethoned.com
...and for a more in-depth look at the process you can visit www.extrudehone.com
RE: Port & Polish to a mirror finish
RE: Port & Polish to a mirror finish
RE: Port & Polish to a mirror finish
cheers, derek
Derek White
www.design-outsourcing.com
RE: Port & Polish to a mirror finish
Courtsey of SFW vid on the Bosch 440's (Performance Upgrade) in comapison to USRT 42# Injectors (Performance Upgerade as per orig design and function)
Bosch EV1 42#
Bosch EV6 42#
The specific injectors that will be used on my application are the 60# Siemens DEKA that have a very wide angle spray pattern for better atomization over the 3 intake ports.
Here are some examples of fuel intjector patterns...The specific ones that would provide better atmomization for this specific head application would be the bent split spray or wide cone.
I have already tested the Bosch EV1 42# which is a pencil spray pattern over the Delphi 42# Injectors (features 3 bent cones @ 20°) and I saw a reduction of almost 2 volts on my knock sensors via datalogging on my car and setup that boasts over 300+whp.
This is what the chamber & exhaust ports look like after cleaning :)
RE: Port & Polish to a mirror finish
The tumbling air along the port walls may
also help keep the fuel suspended in the air
and stop it sticking to the walls.
Send me some info on what setup works well
for you as later this year I'll probably be
building an approx 600hp Audi 4.2 V8
(essentially two of yours glued together.)
cheers, derek
Derek White
www.design-outsourcing.com
RE: Port & Polish to a mirror finish
I will indeed keep you posted on my results :)
RE: Port & Polish to a mirror finish
I´ve heard about that finish in the exhaust ports reduce the carbon buildup, and reflection of the radiation diminishes the heat transfer to the port walls. In the intake ports It´s cool to have a tiny groove perpendicular to the air flow for better air/fuel mixing.
RE: Port & Polish to a mirror finish
RE: Port & Polish to a mirror finish
In regards to the intake ports they have been ground smooth to a 120 grit finish perpendicular to air-flow.