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Originally posted by Bike2112:
... The interesting thing is the size of the lowers. They measure much closer to the larger returnless size...
I posted a month or so ago about the same thing. I checked my LIM after cleaning and got the following measurements:
Upper LIM Hole
Primary: 33.45mm
Secondary: 34.95mm
Difference: 1.50mm
Lower LIM Hole
Primary: 32.64mm
Secondary: 34.05mm
Difference: 1.41mm
*Measuring procedure: Two measurements that agreed per hole, at ~90 degree intervals. Averaged all six of each type of hole to arrive at the above numbers. Measured with digital calipers.
So yeah, I'm still curious about the existence -- or not -- of the larger LIM, as the replies I received from my previous post were inconclusive, IMHO. (No offense to anyone who replied to it.  ) Does anyone else have actual measured data from their larger LIM to compare with these numbers?
Originally posted by Bike2112:
...First, I have an 98 EO SVT #580 something I think...
...Is it possible My car was assembled right when they were switching over to the 98.5 spec...
My car was built in May of 1997, so it was a very early model. If your car is #580, then it was built before mine, as mine is build #786. That would put it well before the 98.5 model year changeover.
Originally posted by Bike2112:
...I noticed the uppers were all about 2-3 mm smaller than the lowers on both the short and long runner ports...
Yeah, mine had an ugly difference in port size between the UIM/LIM as well. The LIM-to-head-port interface was pretty mismatched as well. Almost looked like the heads were skewed a degree or two from the centerline of the engine. Some port matching is definately in order there.
Marty
98 SVT, Black, No. 786, May 7, 1997.
K&N, MSDS, Xcal2, Tint, Antennas, Big Gulp(R)-Sized Cupholder, Rear Dome Lt., Koni/Eibach, DMD, Pre-98 Sails, Brake Cooling Deflectors, Sidemarkers, Etc.
147K+ Miles
"Get the Door - It's GrooveNerd!"
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Hard-core CEG'er
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Originally posted by rkneeshaw3.0:
SVTPETE, I think I want to have sex with your car.
Damn, I thought I loved my car...nver thought to have sex with it! 
Thanks though. It's coming along slowly... 
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Joined: May 2000
Posts: 1,359
Webmaster
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Webmaster
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Originally posted by SVT PETE:
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.
Ok, so the whole 'dual hone' bit a while back was a crock?
-Lance
Lance Kinley
CEG Webmaster
95 SE, "Cassandra"
10 years!
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i think it means that both primaries and secondary ports go done, maybe??
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
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OP
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I memory serves correctly, I believe the dual extrude honing on the later SVT's took place in the heads instead of the UIM. Someone step in here if I am incorrect.
My main inquiry is the fact that my LIM is closer to the later SVT LIM in port size and I have an EO 98. I just thought it was interesting to have such a difference between the port size of the UIM vs. LIM. A little time with the dremmel will take care of this.
On another note, when I had the UIM off, there was no evidence of EH at all as there were several small casting bumps inside the intake. It was not very smooth at all from the factory.
E0 SVT
Kids, yeah, I have kids. How many do you want?
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Well the "literature" says more extrude honing on the UIM and more aggressive extrude honing on both the primary and secondary head ports. (verses just "normal"  EH on the secondary ports)
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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bet it was smoother then mine, i can take some pics later to prove it, mine looks like concrete almost, very bump inside
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
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E0 SVT
Kids, yeah, I have kids. How many do you want?
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Originally posted by gearhead98:
bet it was smoother then mine, i can take some pics later to prove it, mine looks like concrete almost, very bump inside
Sounds just like mine.
E0 SVT
Kids, yeah, I have kids. How many do you want?
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CEG\'er
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My SVT UIM was a LOT smoother than the SE UIM that I had on the car during the recent group buy. How to describe it. Say the SE UIM is like concrete, very bumpy. The SVT UIM would be like concrete in your basement or garage floor. Still not perfect but MUCH smoother. Hope that helps a little.
I'm not sure if there were any pictures taken of the differences inside the passages, the only ones I can recall were of the different diameters.
Bill
'00 SVT Black/Tan
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