Unusual SOHC V6 upper intake manifold

[2000StreetRod]

Has anyone ever seen an SOHC V6 upper intake manifold like the one shown in the link below to an eBay listing? It's claimed to be off a 2000 model but mine is entirely different.

FORD 4.0 SOHC ENGINE INTAKE MANIFOLD W/TB #4110

Below is the photo for the listed item.

 

[Ronin8002]

looks just like the one on my 2004

 

[2000StreetRod]

Thought they were single unit

looks just like the one on my 2004

Thanks for the reply. I thought that the newer SOHC V6 intakes were all single units (integrated upper and lower) and the throttle body was at the front instead of the side. Your configuration may be more suitable for some of my planned future projects. It looks like it will bolt directly to my lower intake manifold shown below.

How/where does the EGR tube enter the intake manifold on your engine?

 

[Carguy3J]

Unless my eyes are playing tricks on me, there is no way that will bolt to your lower intake. Your lower has a single "row" of runner, whereas the ebay manifold appears to be wider, and have the runners in a more staggered "side-by-side" configuration. In addition, even if it's just an optical illusion because of the angle of the photo, and it is a single row, then the first (Closest to the front of the vehicle) runner still appears to be canted at exactly the opposite angle as would be needed to bolt to your lower intake.

Now, if that really is an '04 upper, maybe the 'o4 lower would bolt to your engine?

Still, along with EGR issues, that passenger-side facing TB might also be a problem. It would be so close to the alternator and a/c lines, etc, that I don't see how you could route your air intake to it without a sharp bend just before the TB. Obviously that would introduce quite a bit of turbulence and flow restriction. I'm curious what "future projects" you have in mind, that this would be helpful for?????

 

[2000StreetRod]

Upside down

You're right! I was remembering the bottom of my lower intake instead of the top. I should have noticed when I added the photo.

I'll start searching for a lower to go with the upper. I wonder if the 2004 is cableless (electrical) throttle control.

 

[Ronin8002]

I wonder if the 2004 is cableless (electrical) throttle control.

Mine is, but you might be able to bolt a cable throttle body on.

I'll have to get back to you on the EGR, I'm on a trip right now and can't take a look under the hood.

 

[Carguy3J]

Mine is, but you might be able to bolt a cable throttle body on.

I'll have to get back to you on the EGR, I'm on a trip right now and can't take a look under the hood.

I'm sure you could, even if required a small spacer/adapter (not saying it does). However, with that sidemounted TB, you'll have to fab up a bell-crank mechanism or throttle cable extension of some sort.

Again, it seems like a lot of work. 2000streetrod, what kind of mods do you forsee needing this manifold style for?????

The other thing to keep in mind, that "new" manifold appears to have both longer runners and a larger plenum volume than "old" one. While this may help improve mid to upper rpm HP, especially with forced induction; it will hurt your lower end torque (assuming naturally aspirated, and/or prior to boost "coming on" if F/I) This change in runner length/plenum volume, in and of itself may require a decent amount of custom tuning to compensate for the new power curves.

 

[2000StreetRod]

Plenum & runners

It looks like the driver side acts as a plenum and there are only three runners from the plenum to the midpoint between the intake ports for opposite cylinders and then splits. If so, I wonder if the flow for cylinder #1 interacts with the flow of cylinder #4 for example.

I agree that if the lower intake manifold on the 2004 is the same height as my 2000 that the intake runners will be longer. I can't remember which way VIS works. Does a longer intake runner improve low speed or high speed performance?

Forced induction (electric motor driven rotrex supercharger mounted on the passenger side inner fender) is what I'm investigating.

 

[2000StreetRod]

Single unit intake manifold

From the photo above it appears the 2004 intake manifold may be a single unit that bolts directly to the heads as shown below.

If so, the electrical wiring for the injectors must be different.

 

[IZwack]

That 3rd gen manifold looks like it might actually lead to performance lost at higher RPMs. The runners are longer - which is good for low end torque. But it seems to get rid of the variable intake design - so that probably means the 3rd gen's dont have that "umph" that kicks in at ~3k RPMs.

 

[2000StreetRod]

VIS only on 97 & 98

That 3rd gen manifold looks like it might actually lead to performance lost at higher RPMs. The runners are longer - which is good for low end torque. But it seems to get rid of the variable intake design - so that probably means the 3rd gen's dont have that "umph" that kicks in at ~3k RPMs.

The variable induction system (VIS) with the vacuum actuated intake runner length change was only implemented in the 1997 and 1998 models. I suspect that it had reliability problems. The length of the intake runners was supposed to start changing at 3000 rpm and be fully changed by 3500 rpm. I suspect many engines never exceeded 3000 rpms for long periods of time and the change mechanism because stuck in the lower rpm range position. Several members have found the actuator rod between the vacuum motor and the runner control lever disconnected at one end.

I agree that the longer runners should improve lower end torque and probably fuel economy. I would like to see some dyno results to compare the 2nd and 3rd generation intakes. For my stock engine the rwhp began to rapidly drop above 6000 rpm. I have my shift points for all gears set at 5950 rpm or below to stay in the power band. The stock exhaust system may be a significant contributor to the high rpm power drop. I probably should upgrade my exhaust before adding a low boost pressure supercharger.

 

[2000StreetRod]

EGR configuration

The photo in the first post shows the EGR valve located at the rear just after the throttle body. Does anyone know if the EGR tube comes from the driver (left) or passenger (right) exhaust manifold? The EGR valve on my 2000 is at the front with the EGR tube coming from the driver side exhaust manifold. I would like to relocate it because I need more room near the front of the engine. Would someone please post a photo of their 2004 SOHC V6.

 

[2000StreetRod]

Individual runners & throttle body

I found the photo below that shows there are individual runners for each cylinder port.

From the photo below it looks like the throttle body may have the same bolt-on pattern as the 2nd generation.

 

[IZwack]

I don't remember hearing many problem about the variable intake. I certainly didn't run into any trouble - but I'm probably wrong.
Posted via Mobile Device

 

[Ronin8002]

The photo in the first post shows the EGR valve located at the rear just after the throttle body. Does anyone know if the EGR tube comes from the driver (left) or passenger (right) exhaust manifold? The EGR valve on my 2000 is at the front with the EGR tube coming from the driver side exhaust manifold. I would like to relocate it because I need more room near the front of the engine. Would someone please post a photo of their 2004 SOHC V6.

EGR on my 04 comes off the passenger side exhaust manifold, goes up along the firewall, then into the firewall facing side of the intake manifold.

and yes...the intake bolts right to the heads

 

[2000StreetRod]

DPFE location?

EGR on my 04 comes off the passenger side exhaust manifold, goes up along the firewall, then into the firewall facing side of the intake manifold.

and yes...the intake bolts right to the heads

Do you have a DPFE (differential pressure feedback EGR) sensor? If so, where is it mounted?