Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Machined LIM

I was wondering if anyone has ever machined there LIM where it reduced the height of the intake? I know if the lower intake was machined and an amount of maybe, lets say for example 1/2 inch was removed how much more top end would we gain and how much torque would we lose? I tried looking this up but it seems i can't find any previous data or maybe i typed the wrong info in the search.

But this is only up for disscussion and asking for personal opinions, DO you think
1#leave the way it is,
2#Cut LIM,
3#Get a Spacer and increase the LIM height?

Because i do know of people who can build us Phenolic spacers for our cars, He needed a gasket and he said probably the cost of 20.00 per spacer it would range from 3/8 to 1/2 thick?

What does everyone think?

You would not want the UIM to sit closer to the valve covers.

Plus the fuel rail and injectors wouldn't fit if you took off that much LIM height.

How would you mount the UIM if you milled the top down?
Where would the injectors mount if you milled the bottom?

Let's say for argument's sake it did fit and you also welded on new injector bosses.

Your change in rpm range from shortening the runners 1" would be fairly small. Probably make the ideal range a couple hundred rpm higher. The runner length from the common plenums would be about 6% & 10% shorter respectively.

It might make sense for a high compression engine with some custom cams.

However without other considerable changes to the engine the higher powerband would be wasted and your midrange would suffer.
I'd take it for granted you would completely remove the butterflies with an engine like this so we won't comment of the low end.

Hot intake manifolds act as radiators for your heads. If you cut off that heat exchange your will increase valve and chamber temperture putting you closer to detonation. Cooler air (marginally cooler) or a cooler valves. Its a trade. However i hardly share the runner length argument. Shorter =better racing performance to about 5 inches in total length. You all have substantially long mid port runners already in the head.

I see what your saying but i never got the chance of measuring the distance to see if there will be enough clearence.

Well i don't have the LIM height and i don't know how much clearence is needed but it would be a sweat project to try, only to see what would come out of this.

Everyone knows, shorter the intake the more the rpm range would be lifted, but all i hear is people mentioning that our power starts drifting at 6,800 and after it goes down hill at that point. So i was thinking? maybe this could be a fix, but only the key players on this board will know if this idea would work, and so far it sounds like a no.

I was wondering has anybody heard of anyone else who has tried this?

2 of the key players have already spoken...why would you want to raise the powerband on the SVT? It's already high enough, there's about 0 torque in the 2500 range. This project sounds to cause far more problems than benefits, but it's your car.

im 18, and i dont think it is a good idea to go messing with the flow characteristic's of the intake manifolds, there is alot more that it can effect then hp

Here's another idea for discussion ... what about milling out the primary ports on the LIM by 1-2 mm all the way down. Currently, they're tapered and I can't find anyone that will taper mill, so would there be any benefits to a straight mill all the way down? The fuel injector seating should still be ok from what I can surmise. The primary ports on the gasket have about 1-2 mm of hard plastic that can be dremelled away to just before the rubber gasket part that does the actual sealing. Might be some head porting I guess??

I understand the cfm flow would change, but because i couldn't find any information on this site when i searched i thought i would might as well ask to see if people have tried this.

I know when you order performance intakes of course some intakes are set to flow for more top end which means shorter runners and larger ports. OR vise versa

So I thought after reding the LIM from sho-shop i was thinking is there anything else we could possibly do?

Well i thought hey larger ports how about "MAYBE" if it is possible if we can shorten the runners?

This is how i came to this conclusion , of course i understand flow will change, that is a given, that is why i thought if we needed quicker flow with more air to our heads at those rpms, casue it sounded as the LIM could help.

But sorry for mentioning this cause i don't want to fight over this disscussion, and i'm sorry for attacking Johhnysvt
cause I just don't want [censored] talked, everytime some one posts on here, it seems from all the search and readings that i have done people get atacked on here very quickly, so i was hesitant on posting. I decided to take a chance knowing what might happen.

Gear thanks i did look at demons website and read about bearings i do know that bearings are ideal for drivers who want to rev at high rpms incase we get those blown motor rod knocks.

Other than stabalizing the lower which is a good idea especially in what i'm looking to do, i was thinking of everything possible before i decided to start ordering parts.