port & polish
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
It would help...but how much for the effort?? There are 2 ways to do a P&P job. Gasket matching and full P&P. I've done both.
Gasket matching is easy, it's a good way to eliminate obstructions in the flow of Exh or fuel. As the name implies you use the gaskets as templates and just gradually tapper into port followed by a general clean up, without changing the shapes of the ports.
A full P&P needs a good set of templates to assure uniformity from port to port. I'm pretty that none have been developed for a PSD so it would necessitate making them as you go. You really need a flow bench to determine if you are helping or hurting the flow.
BTW: Polishing the intake to a mirror finish is not a good idea for any engine. It allows the fuel to form droplets and hang onto the passage walls. The exhaust should be polished. It helps avoid carbon deposits from forming.
Gasket matching is easy, it's a good way to eliminate obstructions in the flow of Exh or fuel. As the name implies you use the gaskets as templates and just gradually tapper into port followed by a general clean up, without changing the shapes of the ports.
A full P&P needs a good set of templates to assure uniformity from port to port. I'm pretty that none have been developed for a PSD so it would necessitate making them as you go. You really need a flow bench to determine if you are helping or hurting the flow.
BTW: Polishing the intake to a mirror finish is not a good idea for any engine. It allows the fuel to form droplets and hang onto the passage walls. The exhaust should be polished. It helps avoid carbon deposits from forming.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Gasket match should help especially if there is a lot of material protruding into the ports.
P&P will be a waste of time if you don't have a flow bench. Grinding on cast iron is time consuming. Without a flow bench you could be wasting your time and possibly make them flow worse. Heck that can even happen with a flow bench in the wrong hands.
P&P will be a waste of time if you don't have a flow bench. Grinding on cast iron is time consuming. Without a flow bench you could be wasting your time and possibly make them flow worse. Heck that can even happen with a flow bench in the wrong hands.
Posting Guru
Joined: Nov 2007
Posts: 2,014
Likes: 1
From: Long Island, NY
IMHO I don't think it would be worth it. We have turbos that force the mix into the cylinders so I cant see where a port and polish will do much if any thing. Gasket match might help if its bad but port and polish no.
Lead Driver
Joined: Jul 2007
Posts: 5,715
Likes: 1
+1 i dont think it will be worth it at all on a 7.3, unless you plan on spinning it at 5000rpms. gasket matching would not hurt anything, but i still dont think its worth the time and effort.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Any engine with restrictive head porting, forced induction or not, will benefit from P&P regardless of RPM. Larger ports = more CFM...more CFM = more power. If the ports are too large, velocity will suffer, you could even cause reversion.
There is no proven information that I know of for our PSDs. The heads may already be flowing more than the engine can handle even with a performance cam and valves, if there is such a thing, who knows? There just isn't a lot of knowledge out there. The ones that do know... ain't telling. After market is non existent or too expensive.
I say if you have lots of time and the expertise then whittle away at it....then post your findings here. Free, proven info is always welcome.
There is no proven information that I know of for our PSDs. The heads may already be flowing more than the engine can handle even with a performance cam and valves, if there is such a thing, who knows? There just isn't a lot of knowledge out there. The ones that do know... ain't telling. After market is non existent or too expensive.
I say if you have lots of time and the expertise then whittle away at it....then post your findings here. Free, proven info is always welcome.
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Lead Driver
Joined: Jul 2007
Posts: 5,715
Likes: 1
there are two aftermarket cams available for the 7.3, both have too much overlap and will cause a hard start even on the warmest of days so basically unless you love spraying ether stay away!
ferrea will make you any valve you want...$$$$$
i have never seen any port flow numbers for the 7.3, but i know someone had posted up info on cylinder pressures (it was for testing water/meth) and there was no issues with cylinder filling up to 4000rpms.
i would love to see waht these engines do with smaller diameter, tapered, raised ports. i bet it would give more power under the curve, and be great for all the "work" trucks.
ferrea will make you any valve you want...$$$$$
i have never seen any port flow numbers for the 7.3, but i know someone had posted up info on cylinder pressures (it was for testing water/meth) and there was no issues with cylinder filling up to 4000rpms.
i would love to see waht these engines do with smaller diameter, tapered, raised ports. i bet it would give more power under the curve, and be great for all the "work" trucks.
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Elder User
Joined: Jan 2008
Posts: 644
Likes: 0
From: indy
thats why i was thinkin it would be great to do because we have turbos that cram air in there i thought maybe it wouldnt take as much to pack more air in which would benifit more for less boost
Posting Guru
Joined: Nov 2008
Posts: 1,138
Likes: 0
From: Lakewood, Colorado
Any engine with restrictive head porting, forced induction or not, will benefit from P&P regardless of RPM. Larger ports = more CFM...more CFM = more power. If the ports are too large, velocity will suffer, you could even cause reversion.
There is no proven information that I know of for our PSDs. The heads may already be flowing more than the engine can handle even with a performance cam and valves, if there is such a thing, who knows? There just isn't a lot of knowledge out there. The ones that do know... ain't telling. After market is non existent or too expensive.
I say if you have lots of time and the expertise then whittle away at it....then post your findings here. Free, proven info is always welcome.
There is no proven information that I know of for our PSDs. The heads may already be flowing more than the engine can handle even with a performance cam and valves, if there is such a thing, who knows? There just isn't a lot of knowledge out there. The ones that do know... ain't telling. After market is non existent or too expensive.
I say if you have lots of time and the expertise then whittle away at it....then post your findings here. Free, proven info is always welcome.
I would much rather have a lower CFM head with more velocity and swirl than a head with HUGE CFM numbers and low velocity...
Freshman User
Joined: Oct 2007
Posts: 37
Likes: 0
From: Woodcliff Lake, New Jerse
Umm unless i have a different PSD there is no fuel in suspension in the intake runner....
As stated above a quick gasket match and rounding of the short radius on the intake and exhaust runners can do nothing but help and the deeper you go the more equipment you need. While your in there you should get studs and fire rings and some beehive springs... and do a 5-angle on your valves....
If you did anything right you should see slightly lower boost numbers at a given load (not wot) Less intake and exhaust restriction means less boost wasted on restriction to make the same amount of power
Hell just fill the block get some twins and hit the track
As stated above a quick gasket match and rounding of the short radius on the intake and exhaust runners can do nothing but help and the deeper you go the more equipment you need. While your in there you should get studs and fire rings and some beehive springs... and do a 5-angle on your valves....
If you did anything right you should see slightly lower boost numbers at a given load (not wot) Less intake and exhaust restriction means less boost wasted on restriction to make the same amount of power
Hell just fill the block get some twins and hit the track
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
, I spotted that too late to edit it out. I was still in gasser mode when offering up what I know about P&P.... 
Freshman User
Joined: Oct 2007
Posts: 37
Likes: 0
From: Woodcliff Lake, New Jerse
lol, Its all good 
everything you said was spot on. Some people still like a textured surface to cause the bullet of airflow. there a few books out there with serious analysis on it.
everything you said was spot on. Some people still like a textured surface to cause the bullet of airflow. there a few books out there with serious analysis on it.
Lead Driver
Joined: Jul 2007
Posts: 5,715
Likes: 1
it applies to gas and diesel alike, its commonly referred to as "cushion air". the roughness causes a very thin layer of turbulence that "coats" the ports. the intake air rides on the cushion of turbulence and it THEORETICALLY helps for a very nice flowing port. another side thought, our diesels do not have fuel in suspension, however there is (unless ccv modded) oil vapor, and water/meth vapors if you are so equipped.