Using NGK Blues for plug wires, you do not need longer spark plug wires unless you wish to preserve the original coil pack wiring orientation and subsequent swap of the coil wiring and plug wires to suit this.
I shall elaborate.
NGK Blue 7mm wires that are probably the most common standard wire for our 4G6X engines will not fit, lengthwise in their labelled positions or otherwise, when using the Cyclone manifold, original Cyclone coil pack location and standard spark plug wire bracketry located in the spark plug/head cover area. SOLUTION! You can manipulate the system.
I now have the pictures to show what you need to do, saving much time and headache for someone wanting to jump right into this installation scenario.
Okay, using a Cyclone manifold, original Cyclone coil pack bracket and Cyclone Transistor plate all these pictures will make sense. If you do not have the Transistor plate, you simply need to make a plate. If you do not have the coil pack bracket, EHMotorsports just showed you in the last post, a HOW-TO on creating one.
Let the pictures begin!
Re-wiring the coil packs, essentially swapping the wiring from the left coils, to the right and vice-versa, leaves the spark plug locations as follows:
Visual on the wires. First photos will be PRE-SWAP (ie original orientation as you might find them fresh from the factory. Pictured is the 1989 Mirage/Colt wiring, likely identical to the 1990 DSM.
Original positions as follows:
MODIFIED locations and wiring schematic, just in case anyone is color blind:
Notice the covers in the background, you have to notice that they have different sized holes for the wiring to come out from the towers, they must be switched side to side.
Final note for the coil wiring towers. Seems Mitsubishi liked to change the nuts that were used between the Mirage/Colt and DSM posts. They used 7mm nuts and 8mm nuts for the smaller of the posts. If you can get 8mm nuts, it will make working on the car much easier, should any wiring ever have to come off again, because what else on this car is 7mm!! 8,10,12,14,17, 22mm .... haha. Saved you the headache of not having brought the correct tool home.
So, you now have the coils wire locations figured out, but you need to disregard the plug wires orientation going over the rocker cover because the NGK Wires are not long enough to achieve proper fitment if you use the coil pack in the stock Cyclone location. Pics will show what you have to do, to make them fit snugly.
First attempt - COULD NOT FIT THE WIRE COVER IN PLACE IN THIS ORIENTATION, but it does look pretty. If you had longer or custom wiring, the old throw back thought to King wires comes up, or a call to NGK, you could use this orientation. Coil pack wiring is still swapped to achieve this.
This is the wire orientation I found worked best, and everything fits, including the spark plug wire cover! NOTICE THE WIRE FLIP NEAR THE OIL CAP AREA!! The wires extend straight down after that.
Coil pack nearest the fuel rail. Going from the front terminal to the back, NGK wire #1, then #3.
Coil pack nearest the firewall. Going from the front terminal to the back, NGK wire #4, then #2.
Final outcome with all covers in place.
Final Cyclone TRANSISTOR plate modification. Using a 1990 style wiring harness means getting your wires to the top of a transistor plate as would happen using the stock Cyclone wiring orientation, was not going to happen. Decided to aim the Transistor pins down back towards the main engine harness (it gets very close so I cut the plate back and mounted the transistor using the two holes I had already made! Small victory .....