porting upper plenum on 4.6..A MUST

sleeper_stang_2000 · 06-10-2003, 10:56 AM

Guys, if you haven't opened up the upper intake plenum on your 4.6 engines you gotta get it done! There is a whole lot of room left in there and the walls are rougher than pavement! You will notice a difference.

stangt00 · 06-13-2003, 04:52 PM

What did you do to yours? Sand them?

surfbeast · 06-13-2003, 07:28 PM

While polishing mine for looks ( the outside ) i noticed how rough it was on the inside. I used a die grinder with a sanding wheel with 80 grit and sanded/ported the walls down smooth. then went to finer grit to get a polished finish. It opened it up quite a bit and had to help air flow. It took all of an hour to remove port and replace. I'm sure I could have opened it up even more but I got to where I felt comfortable and left it at that. Also added an intake spacer while I was at it.

96_4.6 · 06-13-2003, 10:20 PM

Anyone in Michigan wanna do mine for me and make some money?? heheh

explicitone · 06-14-2003, 07:46 AM

I was thinking of doing this for awhile I just have 1 ?? it the gasket for the upper reusable or do I need to get a new one

thanks for any help
tony

surfbeast · 06-14-2003, 05:15 PM

It's reusable, just a paper gasket. This is super easy! If you have the right tools. I used an air die grinder, you can rent one cheap or use a electric one. A drill won't get you enough RPMs. use the sanding wheel that looks like sandpaper squares glued to a bit. some call it a flapper wheel. Mine had sanpaper with scruber pad inbetween the sheets of sandpaper. Works wonders!

stangt00 · 06-14-2003, 05:34 PM

Actually, I just spoke to the shop who tunes my, and many other stangs, about this. He said there was absolutely no power gain or change in power curves on the dyno's from doing this. Also, take too much off the inside and the heat can cause the plastic to crack if there is a weakened wall. This worked well with carbuerated motors. If the walls from the intake were rough, it would cause the fuel and air to seperate. Hope this saves some of you from wasting your time, and or money.

sleeper_stang_2000 · 06-15-2003, 11:34 AM

What plastic are you talking about? The upper plenum is made of aluminum.....

stangt00 · 06-15-2003, 06:54 PM

I was talking about the lower one. People have tried porting it and they wound up cracking.

GTvert · 06-16-2003, 03:41 PM

As far as this not producing any horsepower, MM&FF dynoed the ported intake vs. stock and got roughly 10 hp &14 lb/ft in May I think.

ajcolv · 06-16-2003, 04:42 PM

Unfortunately, no one in the "real world" seems to have done this and dynoed afterward. I've read several posts on this but no one can give us numbers. No offense to anyone associated with the article, but until I read it from more reliable sources (not the butt-o-meter), it doesn't seem like a worthwhile mod.

Mustang92 · 06-17-2003, 01:04 PM

Quote:

Originally posted by ajcolv
Unfortunately, no one in the "real world" seems to have done this and dynoed afterward. I've read several posts on this but no one can give us numbers. No offense to anyone associated with the article, but until I read it from more reliable sources (not the butt-o-meter), it doesn't seem like a worthwhile mod.

Actually someone has, check out the link...

http://www.modulardepot.com/articles.php?aid=5

Bill

ajcolv · 06-18-2003, 10:16 AM

I stand corrected. Thanks Bill. I know I can always rely on you to provide us with new and correct information. I guess it's not a bad idea, especially those that are good with a dremel. Approximately 3 rwhp isn't bad for the time, or price if someone else does it. That's about half the price of a CAI for the same gains.

96_4.6 · 07-14-2003, 07:25 PM

I have the drill bit to port and polish but all I have is an electric drill, is that powerful enough?????

The Deuce · 07-16-2003, 10:54 AM

DO NOT do this mod on a Supercharged car. I've seen first had dyno losses with the mod.

Just a note....

06-10-2003, 10:56 AM	#1
sleeper_stang_2000 Registered Member Join Date: Mar 2003 Location: south florida Posts: 45	porting upper plenum on 4.6..A MUST Guys, if you haven't opened up the upper intake plenum on your 4.6 engines you gotta get it done! There is a whole lot of room left in there and the walls are rougher than pavement! You will notice a difference. __________________ 2000 GT Coupe Automatic! CAI, X-Pipe, Eibach Pro, 100 Shot NOS Best run: 12.187 @112.9 w/ 1.75 60ft. 3ft Above Sea evel

06-13-2003, 04:52 PM	#2
stangt00 Registered Member Join Date: Dec 2002 Location: Philadelphia PA Posts: 143	What did you do to yours? Sand them? __________________ 2000 GT 80mm Pro-M mass air, 24lb injectors, 75mm BBK T/B, K&N Filter Cold Air, 1/2" Phenolic intake spacer, Underdrive Pulleys, Dyno Tuned Autologic Chip, FMS Shorty Headers, Mac Prochamber 2 1/2" Off Road H pipe, 2 Chamber Flowmasters, Steeda lowering springs. Steeda Tri-Ax Short Throw shifter, Steeda Power slot rotors w/ Hawk Pro pads, 3.73 FRP Gears. Headwork and Comp cams install in progress.

06-13-2003, 07:28 PM	#3
surfbeast Registered Member Join Date: Feb 2002 Location: Maryville,TN Posts: 415	While polishing mine for looks ( the outside ) i noticed how rough it was on the inside. I used a die grinder with a sanding wheel with 80 grit and sanded/ported the walls down smooth. then went to finer grit to get a polished finish. It opened it up quite a bit and had to help air flow. It took all of an hour to remove port and replace. I'm sure I could have opened it up even more but I got to where I felt comfortable and left it at that. Also added an intake spacer while I was at it. __________________ 98 GT / convertable -98 Saleen engine, Saleen appearance pkg. SHM cams,P&P NPI heads, and so much more!

06-13-2003, 10:20 PM	#4
96_4.6 Registered Member Join Date: Jul 2002 Location: Michigan Posts: 417	Anyone in Michigan wanna do mine for me and make some money?? heheh __________________ 1996 Mustang GT, AODE -Trickflow Upper Plenum -BBK 70mm Throttlebody -02 PI Lower Intake -March Pulleys -BBK H-Pipe -2 Chamber Flowmaster mufflers -3000 RPM Stall -JLT CAI with special K&N -MSD Supercondutor wires -180 stat -FRPP 4:10's *FOR SALE C&L TRUE FLOW INLET PIPE WITH K&N* My Stang

06-14-2003, 07:46 AM	#5
explicitone Registered Member Join Date: Apr 2002 Location: racine ,wi Posts: 691	I was thinking of doing this for awhile I just have 1 ?? it the gasket for the upper reusable or do I need to get a new one thanks for any help tony __________________ RUN IT STAIGHT AND RUN IT HARD ________ Novi 2000 60' 1.46 1/4 10.67 mph 126.5 _________

06-14-2003, 05:15 PM	#6
surfbeast Registered Member Join Date: Feb 2002 Location: Maryville,TN Posts: 415	It's reusable, just a paper gasket. This is super easy! If you have the right tools. I used an air die grinder, you can rent one cheap or use a electric one. A drill won't get you enough RPMs. use the sanding wheel that looks like sandpaper squares glued to a bit. some call it a flapper wheel. Mine had sanpaper with scruber pad inbetween the sheets of sandpaper. Works wonders! __________________ 98 GT / convertable -98 Saleen engine, Saleen appearance pkg. SHM cams,P&P NPI heads, and so much more!

06-14-2003, 05:34 PM	#7
stangt00 Registered Member Join Date: Dec 2002 Location: Philadelphia PA Posts: 143	Actually, I just spoke to the shop who tunes my, and many other stangs, about this. He said there was absolutely no power gain or change in power curves on the dyno's from doing this. Also, take too much off the inside and the heat can cause the plastic to crack if there is a weakened wall. This worked well with carbuerated motors. If the walls from the intake were rough, it would cause the fuel and air to seperate. Hope this saves some of you from wasting your time, and or money. __________________ 2000 GT 80mm Pro-M mass air, 24lb injectors, 75mm BBK T/B, K&N Filter Cold Air, 1/2" Phenolic intake spacer, Underdrive Pulleys, Dyno Tuned Autologic Chip, FMS Shorty Headers, Mac Prochamber 2 1/2" Off Road H pipe, 2 Chamber Flowmasters, Steeda lowering springs. Steeda Tri-Ax Short Throw shifter, Steeda Power slot rotors w/ Hawk Pro pads, 3.73 FRP Gears. Headwork and Comp cams install in progress.

06-15-2003, 11:34 AM	#8
sleeper_stang_2000 Registered Member Join Date: Mar 2003 Location: south florida Posts: 45	What plastic are you talking about? The upper plenum is made of aluminum..... __________________ 2000 GT Coupe Automatic! CAI, X-Pipe, Eibach Pro, 100 Shot NOS Best run: 12.187 @112.9 w/ 1.75 60ft. 3ft Above Sea evel

06-15-2003, 06:54 PM	#9
stangt00 Registered Member Join Date: Dec 2002 Location: Philadelphia PA Posts: 143	I was talking about the lower one. People have tried porting it and they wound up cracking. __________________ 2000 GT 80mm Pro-M mass air, 24lb injectors, 75mm BBK T/B, K&N Filter Cold Air, 1/2" Phenolic intake spacer, Underdrive Pulleys, Dyno Tuned Autologic Chip, FMS Shorty Headers, Mac Prochamber 2 1/2" Off Road H pipe, 2 Chamber Flowmasters, Steeda lowering springs. Steeda Tri-Ax Short Throw shifter, Steeda Power slot rotors w/ Hawk Pro pads, 3.73 FRP Gears. Headwork and Comp cams install in progress.

06-16-2003, 03:41 PM	#10
GTvert Registered Member Join Date: Apr 2003 Location: West Plains Posts: 74	As far as this not producing any horsepower, MM&FF dynoed the ported intake vs. stock and got roughly 10 hp &14 lb/ft in May I think. __________________ Slower Traffic Keep Right

06-16-2003, 04:42 PM	#11
ajcolv Registered Member Join Date: Oct 2002 Location: Utah Posts: 58	Unfortunately, no one in the "real world" seems to have done this and dynoed afterward. I've read several posts on this but no one can give us numbers. No offense to anyone associated with the article, but until I read it from more reliable sources (not the butt-o-meter), it doesn't seem like a worthwhile mod. __________________ -Aaron "Lita" 97 Mustang GT Vert -------------------------------------- k&n, air silencer removed, Magnapack cat-back, BBK o/r h-pipe, Ford red front calipers

06-18-2003, 10:16 AM	#13
ajcolv Registered Member Join Date: Oct 2002 Location: Utah Posts: 58	I stand corrected. Thanks Bill. I know I can always rely on you to provide us with new and correct information. I guess it's not a bad idea, especially those that are good with a dremel. Approximately 3 rwhp isn't bad for the time, or price if someone else does it. That's about half the price of a CAI for the same gains. __________________ -Aaron "Lita" 97 Mustang GT Vert -------------------------------------- k&n, air silencer removed, Magnapack cat-back, BBK o/r h-pipe, Ford red front calipers

07-14-2003, 07:25 PM	#14
96_4.6 Registered Member Join Date: Jul 2002 Location: Michigan Posts: 417	I have the drill bit to port and polish but all I have is an electric drill, is that powerful enough????? __________________ 1996 Mustang GT, AODE -Trickflow Upper Plenum -BBK 70mm Throttlebody -02 PI Lower Intake -March Pulleys -BBK H-Pipe -2 Chamber Flowmaster mufflers -3000 RPM Stall -JLT CAI with special K&N -MSD Supercondutor wires -180 stat -FRPP 4:10's *FOR SALE C&L TRUE FLOW INLET PIPE WITH K&N* My Stang

07-16-2003, 10:54 AM	#15
The Deuce Registered Member Join Date: Apr 2002 Location: Atlanta, GA Posts: 2,325	DO NOT do this mod on a Supercharged car. I've seen first had dyno losses with the mod. Just a note.... __________________ 1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60' 1995 Honda VFR750 - not much @ really fast (actual data pending.) 1964.5 Mustang 289 Rice Haters Club Member #13

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