|
|
Joined: Aug 2004
Posts: 618
Veteran CEG\'er
|
OP
Veteran CEG\'er
Joined: Aug 2004
Posts: 618 |
I know this has been posted ad nauseum, but I was cleaning my upper and lower intake manifolds this weekend and noticed something very strange.
First, I have an 98 EO SVT #580 something I think.
When I removed the upper to clean, I decided to take a few measurements to try and port match the upper to the lower. I noticed the uppers were all about 2-3 mm smaller than the lowers on both the short and long runner ports. I don't have the exact measurements, but the lowers were closer in size to the 99-00 measurements. I thought this was very interesting as I knew the upper was supposed to be slightly smaller than the opening of the lower, but a 2-3 mm diff. on all of the upper ports was a big suprise.
So, now I'm thinking, if the upper and lower are designed to gradually taper for more velocity into the heads, why is there such a difference between the upper and lower.
The intake air is forced through the much smaller upper, then expands at the beginning of the lower, only to be compressed again at the bottom of the lower.
How is this supposed to be efficient?
E0 SVT
Kids, yeah, I have kids. How many do you want?
|
|
|
|
|
Joined: Jun 2003
Posts: 1,145
Hard-core CEG\'er
|
|
Hard-core CEG\'er
Joined: Jun 2003
Posts: 1,145 |
dont know how it works well, but that is why so many port match to get ride of that little lip that is there
98.5 Black SE ATX
S&B filter, SVT MAF, optimized SVT TB, mesh grille, removed orange reflectors, painted rear reflector, gutted pre-cats, optimized SVT LIM, 19lb injectors, resonator removed
cant afford an svt but lookin for 1 in nc
|
|
|
|
|
Joined: May 2000
Posts: 1,359
Webmaster
|
|
Webmaster
Joined: May 2000
Posts: 1,359 |
One reason might be that the E0's were only single-pass extrude honed. The second pass done on E1's and later does open up the runners a fair bit.
The large lower does sound weird, however.
-Lance
Lance Kinley
CEG Webmaster
95 SE, "Cassandra"
10 years!
|
|
|
|
|
Joined: Apr 2001
Posts: 5,975
Hard-core CEG'er
|
|
Hard-core CEG'er
Joined: Apr 2001
Posts: 5,975 |
Originally posted by Lance Kinley:
One reason might be that the E0's were only single-pass extrude honed. The second pass done on E1's and later does open up the runners a fair bit.
Incorrect!
Discussed thoroughly when the Extrude Hone Group Buy came about.
To summarize, all SVT UIMs were passed the same number of times - same flow for 98, 99 and 00.
Confirmed by Extrude Hone and Terry Haines. I also took measurements of all runners between a 98 UIM and a 00 UIM and there was almost no difference between the two in the measurements.
|
|
|
|
|
Joined: Dec 2001
Posts: 3,570
Hard-core CEG\'er
|
|
Hard-core CEG\'er
Joined: Dec 2001
Posts: 3,570 |
SVTPETE, I think I want to have sex with your car.
Back on topic: I beleive the extra extrude hone process mentioned by SVT in their brochures had to do with the secondary ports on the heads and the larger LIM ports, and as proven in the other thread, had nothing to do with the UIM.
It IS known that there is a larger SVT LIM out there, found in late SVT's and some of the 00 cougars as well that have 34/35mm ports compared to 32/33mm ports IIRC.
I know I have managed to grab up a 34/35mm LIM.
|
|
|
|
|
Joined: Sep 2002
Posts: 6,106
Addicted CEG\'er
|
|
Addicted CEG\'er
Joined: Sep 2002
Posts: 6,106 |
I'll have to measure my LIM the next time I have it out, hopefully soon to put some bigger injectors in.. I have one of the last 75 CSVT's ever built so I'd imagine I'd have the larger, if it was ever made.
Mark
2000 Black CSVT
3.0L Hybrid - 206fwhp & 195fwtq
|
|
|
|
|
Joined: Dec 2001
Posts: 3,570
Hard-core CEG\'er
|
|
Hard-core CEG\'er
Joined: Dec 2001
Posts: 3,570 |
Originally posted by Y2KSVT:
if it was ever made.
It was, I have it installed and verified the measurements. I personally bought mine off of car-part.com which labeled it as off of a '01 cougar. I had the yard verify the port size before I bought it, and verified again once I received it. 
|
|
|
|
|
Joined: Aug 2004
Posts: 618
Veteran CEG\'er
|
|
OP
Veteran CEG\'er
Joined: Aug 2004
Posts: 618 |
Yes, I am aware of the thread proving that all of the UIM have the same basic measurements, and don't want to bring that up again. The interesting thing is the size of the lowers. They measure much closer to the larger returnless size. Is it possible My car was assembled right when they were switching over to the 98.5 spec and got a larger lower manifold with return style fuel rail. It would be strange if I did, but knowing Ford, it is possible. Please help if possible.
But, I don't mind having the larger lower at all.
E0 SVT
Kids, yeah, I have kids. How many do you want?
|
|
|
|
|
Joined: Sep 2002
Posts: 6,106
Addicted CEG\'er
|
|
Addicted CEG\'er
Joined: Sep 2002
Posts: 6,106 |
Did you buy your car brand new? If not, are you sure the previous owner didn't have work done to it? Could have very well installed it themselves. Who knows
Mark
2000 Black CSVT
3.0L Hybrid - 206fwhp & 195fwtq
|
|
|
|
|
Joined: Aug 2004
Posts: 618
Veteran CEG\'er
|
|
OP
Veteran CEG\'er
Joined: Aug 2004
Posts: 618 |
No, I bought it back in 2000. I don't think the previous owner did anything to the car because they would have probably port matched the upper to match the lower as well as possible and the upper did not look like anyone did anything to it at all.
E0 SVT
Kids, yeah, I have kids. How many do you want?
|
|
|
|
|
