Thread: LIM Modification

Originally Posted by SyntheticShield

Smoothness in the air flow from the LIM, runners and such is not good for fuel economy. Ive always wondered about its benefits for performance as well as a little turbulence in the air flow helps things flow better, but that is another discussion all together.

I know what you're saying. It's weird coming in to this application of flow from what I used to do. I spent a lot of time helping design water blocks for liquid cooling systems in PCs. The idea there is to create turbulence to better facilitate heat transfer.

Yeah, it goes contrary to what you would normally think.

Well I didnt have a lot of time to mess with it today. I had to work on my wifes Jeep. It wasnt cooling like it should so I pretty much went through the whole cooling system and replaced it with the exception of the radiator. Then someone brought by a Dodge for me to work on, looks like it needs a new wheel bearing so I'll have to get that done as well.

But I did come up with something. And it kinda takes advantage of boost and then the low pressure in the cylinders. My thought was to raise the splitter higher, angle it just a bit more, but raise the splitter up so that the air goes to the left and right sides evenly. Isolate the left and right sides essentially. This would be a whole lot easier than trying to channel the air as it would be a matter of simply putting an extension on the splitter to accomplish everything.

Input anyone?

Well I believe that, as some pointed out, the cylinders getting the air is not an issue with it under boost. I think the issue is equal filling of the cylinders due to the fact the blower sits off center from the ports. So if you work from that, then the only thing that is needed is a better splitter with a more shallow angle.

TDC, I was thinking along those lines. Some 1" wide aluminum angle should do nicely. I do believe you would have to cut it in half though or something to get it in there. But the other thing you could do with that is stack it, so that you get a washboard effect. This would have the benefit of creating some turbulence in the flow which would help air flow actually and help atomize the fuel.

This also has the added benefit that if for some odd reason something went horribly wrong, none of the pieces would be small enough to make it to the cylinder and damage anything.

I think the only question would be how to securely mount it in the LIM. You could use some type of epoxy or something like quick steel I suppose. Actually I think quick steel would be a better option of the two, but as far as mounting it with bolts or something, I have no solid ideas at this point.

You're probably right but the problem with tack welding is that not everyone has access to something like that and Im all for coming up with processes, that with a little investment of time and parts, can be done at home by anyone able to follow instructions.

I see what you are saying, and I think saying they arent centered may have been the wrong term, rather off centered would be better, and Im still not convinced its good for flow. That said, however, I agree that a tuned port set up would be much much better. Absent that, I think that raising the splitter so that boost is evenly biased to each bank would have some respectable improvements and would probably be easier to do.

I guess we'll see, I plan on experimenting with this a little and see what I can do with it.

I will be more than happy to share what I find.

Yeah, see James is someone I wish would come here and post up on this issue cause he has a lot of general common sense and detailed information about these cars.