Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec 3L Upper Intake Manifold

Just wondering if this will bolt on to my 2.5L duratec. Also are there any specs for this manifold? Better than SVT???

Thanks!
Rob

The 3L UIM will not bolt up to the 2.5 LIM without modification (if possible at all), I do know that someone has put 2.5 heads on a 3L and used the 3L upper and lower IM's

Have you tried the SVT upper on your cougar?

I beleive Warmonger and Terry have posted info on port sizes in the UIM (3L IIRC is bigger), try a search in 3L section and you should come a cross a few posts with that specific info.

I haven't tried the SVT upper because I can't find one!!! LOL! I've been looking everywhere!

I want an upper and lower svt, but I can't seem to find any.........

Anyway, but with the upper and lower, it should bolt up to my heads right???

Thanks guys!
Rob

Ok i may be wrong the 98-00 lower 3L is the same but wih a different rail. 01 3L have oval ports. heres the measurements courtesy of warmonger's post ahwile back

Dimensions are as follows:
2.5 SVT UPPER
inlet at the throttle body = 67mm
outlet port primary runner = 30.5-31.2mm, ~31mm on average.
outlet port secondary runner = 32.8-33mm ~33mm average

SVT lower IM
primary runner inlet = 33.5 mm
primary runner exit = 32.7 mm
secondary runner inlet = 36 mm
secondary runner exit = 34 mm

3L upper IM (casting flash gives small variation)
inlet at throttle body = 63.75mm
primary runner exit = 30-30.3mm, ~30mm average
secondary runner exit = 31.8-32mm, ~32mm avg.

3L lower IM
primary runner inlet = 33.4-33.5mm, ~33.5mm avg.
primary runner exit = 32.75mm
secondary runner inlet = 35mm
secondary runner exit = 32.75mm

BTW I may have a '00 SVT upper and lower for sale

The specs came of a 98-99 3L upper IM that was aluminum.
It has the combined runner (oval shaped) until right at the end where it bolts to the lower IM. There is a divider that makes it into two ports right there at the exit. The 3L lower is almost identical to the 99 SVT lower, except for the fuel rail. As far as better, who can say?
I have mine for sale though if you want to find out...???
I'm also selling the lower IM. That will fit any 2.5L motor and it is equivalent to any of the later SVT lowers.

wamonger

Warmonger.

Did you measure those with a ruler?

Your measurements are all very large compared to the ones I've done with a micrometer...

I just find it odd your measurements are so much larger than any others posted in the past or the few ones I have measured...

Ruler? Funny. (not)

I used a Mitutoyo Digital micrometer, accurate out to .01 mm, +-.005 mm.

The reason for the variation was because the diameter for the runners was not the same in both the x and y axes. Therefore if they were more eliptical then I put down the full range. The SVT upper manifold can be expected to be eliptical because of how the Xtrude honing forces putty through the tube. You will get preferential wear at the outside of the turns in the tubes.
For the 3L manifold, the rough surface of the tubes results from casting flash and gives rise to a larger amount of error. As far as the lower manifolds, they are initially bored out straight through machining (not left as-cast), and the xtrude hone on the SVT lower is not very agressive, so they are both very similar in diameter and the SVT lower doesn't exhibit any eliptical shape as there are no turns in the lower manifold.
I was very careful about all the measurements, and I even made them more than once due to a request from Bradness.

Which ones were larger than you expected, the SVT manifold, or the 3L manifolds? If you mean the 3L stuff, then I still have it available and I can re-measure it. Unfortunately I cannot re-measure my SVT manifolds as the SVT manifolds are now much larger from being widened, and I can only go by the notes that I took.
I was very carefull with my measurements, but let me know if I can be of any more assistance.

warmonger

No one needs to have any re-measuring done?

warmonger

Actually, IIRC from the swap to my dual honed upper, the stock 2.5L is more squished/elliptical than the SVT was. I figured that the EH rounded it out some.

--- what's wrong with measuring with a ruler ---

http://www.frontiernet.net/~kauffman/pictures/svtupper/2Xhonesvt.JPG

http://www.frontiernet.net/~kauffman/pictures/svtupper/standardMY97.JPG

--4/5/02 frontiernet server appears to be having trouble--

The stocker maybe more elliptical, but I would think that the first pass or so of the sanding putty would stip out most of the casting flash. Then that would make it less elliptical. But continuing passes will hit the outside of the turns in the pipe and that caused them to preferentially sanded.
When I was doing my manifolds, the outside of the turns was very smooth, but the inside of the turn was still slightly bumpy. By turn, I am talking about the final turn at the exit of any of the runners on the upper IM. Anyway, 6 hours with a die-grinder and hand sanding took care of any irregularities.

warmonger