flow numbers on edelbrock rpm intake?

Mach 1 · 02-04-2002, 08:18 PM

anybody know the flow numbers on edelbrock performer RPM intake for a fuelie?

Mach 1 · 02-05-2002, 05:33 AM

Jeff Chambers · 02-05-2002, 07:42 AM

I flowed my RPM as a unit last season. I had an Accufab 65mm TB, Performer RPM upper & lower, and TFS 1/2" phenolic spacer. The upper/lower was gasket matched and the lower was gasket matched to a 1250. Average flow was right at 230cfm with 28inH20 which was 30cfm more than the GT-40 and Explorer intakes that we flowed in the same configuration.

BTW: I've got my RPM intake system for sale if anyone is interested. Email me at jchambers@kellnet.com.

Mach 1 · 02-05-2002, 03:39 PM

to late, i just bought one. Was your RPM intake ported also?

Jeff Chambers · 02-05-2002, 03:51 PM

Only gasket matched, not ported.

Mach 1 · 02-05-2002, 06:02 PM

does that mean you cleaned up the casting flash and what not?

Jeff Chambers · 02-05-2002, 06:17 PM

Just means that the openings were opened up a little to cleanly match the gaskets. We're only allowed to go 1" deep into the ports, so its a pretty minimal of work on the port. The runners, TB opening and plenum have to remain untouched.

Mach 1 · 02-06-2002, 06:37 AM

Im just cleaning mine up. Thats quite a bit of material to be removed to gasket match on the lower. Doesnt seem worth the hassle.

Jeff Chambers · 02-06-2002, 07:54 AM

Every little bit helps. When you install your intake, look down the runners to the head/intake interface and see what kind of alignment you have. Forward facing steps are murder to the intake flow, backward facing steps interrupt the flow to a lesser degree but they still impact flow. Do the same at the upper to lower, TB to intake, elbow to TB, TB to EGR, header to exhaust port. Now add up all those disturbances and imagine their overall effect on the flow quality through your engine. The engine is nothing but a big air pump, so any way that you can make its job easier increases its overall efficiency. In a game where you win or loose rounds by a thousandth of a second, its worth the time and effort.

With the intake sinched down, I take a piece of clay on the end of a long screwdriver and press it onto the head/gasket/intake surface on all four walls of the port. From the impression, I can see if the intake needs to be shifted fore/aft or up/down to get the best alignment of the ports.

Mach 1 · 02-06-2002, 06:29 PM

I guess I can see how the clay would help determine port misalignment, but how do you enlarge the lower port to the gasket size at the same place it needs to be enlarged when it is sitting on the engine heads? Just holding the gasket on the lower will show you how much smaller the port is, but how do you put the gasket on the lower in exactly the same spot it will be in when bolted to the head?

Jeff Chambers · 02-07-2002, 09:20 AM

You have to match mark everything. Put it together where you think things should be then scribe lines so that when you take it apart you can line them up separately. Then you can lay the gasket on the surfaces and use some bluing dye and a scribe to locate and trace the gasket opening on the two mating surfaces. Then widdle away.

Then when I do the final assembly, I always use a few drops of superglue to place the gasket and hold it in place so that it won't move as I'm bolting things together.

02-04-2002, 08:18 PM	#1
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	flow numbers on edelbrock rpm intake? anybody know the flow numbers on edelbrock performer RPM intake for a fuelie? __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

02-05-2002, 05:33 AM	#2
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	ttt __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

02-05-2002, 07:42 AM	#3
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	I flowed my RPM as a unit last season. I had an Accufab 65mm TB, Performer RPM upper & lower, and TFS 1/2" phenolic spacer. The upper/lower was gasket matched and the lower was gasket matched to a 1250. Average flow was right at 230cfm with 28inH20 which was 30cfm more than the GT-40 and Explorer intakes that we flowed in the same configuration. BTW: I've got my RPM intake system for sale if anyone is interested. Email me at jchambers@kellnet.com. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

02-05-2002, 03:39 PM	#4
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	to late, i just bought one. Was your RPM intake ported also? __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

02-05-2002, 03:51 PM	#5
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Only gasket matched, not ported. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

02-05-2002, 06:02 PM	#6
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	does that mean you cleaned up the casting flash and what not? __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

02-05-2002, 06:17 PM	#7
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Just means that the openings were opened up a little to cleanly match the gaskets. We're only allowed to go 1" deep into the ports, so its a pretty minimal of work on the port. The runners, TB opening and plenum have to remain untouched. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

02-06-2002, 06:37 AM	#8
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Im just cleaning mine up. Thats quite a bit of material to be removed to gasket match on the lower. Doesnt seem worth the hassle. __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

02-06-2002, 07:54 AM	#9
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Every little bit helps. When you install your intake, look down the runners to the head/intake interface and see what kind of alignment you have. Forward facing steps are murder to the intake flow, backward facing steps interrupt the flow to a lesser degree but they still impact flow. Do the same at the upper to lower, TB to intake, elbow to TB, TB to EGR, header to exhaust port. Now add up all those disturbances and imagine their overall effect on the flow quality through your engine. The engine is nothing but a big air pump, so any way that you can make its job easier increases its overall efficiency. In a game where you win or loose rounds by a thousandth of a second, its worth the time and effort. With the intake sinched down, I take a piece of clay on the end of a long screwdriver and press it onto the head/gasket/intake surface on all four walls of the port. From the impression, I can see if the intake needs to be shifted fore/aft or up/down to get the best alignment of the ports. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

02-06-2002, 06:29 PM	#10
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	I guess I can see how the clay would help determine port misalignment, but how do you enlarge the lower port to the gasket size at the same place it needs to be enlarged when it is sitting on the engine heads? Just holding the gasket on the lower will show you how much smaller the port is, but how do you put the gasket on the lower in exactly the same spot it will be in when bolted to the head? __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

02-07-2002, 09:20 AM	#11
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	You have to match mark everything. Put it together where you think things should be then scribe lines so that when you take it apart you can line them up separately. Then you can lay the gasket on the surfaces and use some bluing dye and a scribe to locate and trace the gasket opening on the two mating surfaces. Then widdle away. Then when I do the final assembly, I always use a few drops of superglue to place the gasket and hold it in place so that it won't move as I'm bolting things together. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

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