I know this is an old topic, however since I am about to make this mod, I figure I'll ask for some help.
I dont' know demon, however from searching and reading his posts, he seems to be a resident expert...
I have a 1999 Mystique, with the returnless fuel system. I was about to put on the 98.5 SVT UIM and LIM, but now, I don't think the LIM is the way to go.
From what I gather from DemonSVT's quote, the LIM associated with the returnless fuel system is the largest bore, now where I am lost is the Head EH'ing. If the SVT Heads are opened up, and the 99+ Returnless Duratec has the larger bore- does this mean that there is a lip created by the stock duratec head????
I have the UIM and LIM from a 98.5. Do you see faults with my intention fo strap on the UIM??
Circa 2005
Originally posted by DemonSVT:
Originally posted by Mondeo V6:
Got two side by side!! The outer diameter IS the same.The ports are not the same bore all the way through-they are tappered.HTH
Yes, but what SVT LIM are you comparing it too. The early LIM are just a stock LIM bored out ~2mm.
The late model SVT/returnless LIM is actually a different casting. It's around 4-7mm larger then either the early SVT or stock respectively as is.
LIM are classified by the inlet port diameter. They all taper to a smaller outlet port.
Something else you need to be aware of is the SVT's had the head inlet ports EH'd to open them up. (98/98.5 single - secondary & 99/00 dual - both ports)
Adding a larger LIM to an older SVT or especially any non-SVT will create a lip protruding into the airflow! Very bad for performance.
Also all head ports have a fair amount of machining flash that lips into the airflow too. A must to remove.
