97driftstang

So Im possibly buying a 4.6 pi motor will I need computer for it to run

Derf00

Yes, preferably the from the donor car along with the wiring harness from the same car. It's is the easiest way to do a swap. Otherwise you will be chasing your tail as some of the connectors will be different and the ECM (Computer) will be programmed for a mismatched engine.

97driftstang

So what if it is from an exploroer

08'MustangDude

Aren't the engine mounts different for the PI motor?

You'd be better off with just changing over to the PI heads on your motor.

The difference between PI and non-PI heads is largely due to the difference in sizes of the camshaft profiles.
The PI heads upgraded the cams to .535 inches lift on the intake, and .505 inches on the exhaust. The duration
fell to 192 degrees on the intake, and 184 degrees on the exhaust. This combination yielded a very nice
improvement in low end torque and flow across the board. Both cams are compatible with all three cylinder
head designs. Non PI cams are .480 inches lift on the intake and exhaust side. The valve duration at .050-
valve lift came in at 204 degrees intake, and 208 degrees exhaust.

The PI heads came with 42cc combustion chambers, as opposed to the 51cc non-PI heads. This will cause an
increase in compression on non-PI engines to roughly 10.5:1. With just the the PI heads and matching intake
manifold you can expect roughly a 30hp and 40lb/lb. torque increase. Not bad at all for a fairly simple swap.

There is room for improvement on the stock PI heads as well. CNC porting to raise flow numbers on the intake
and exhaust sides. With all this, tuning, exhaust, intake, you can further increase HP and TQ.

A PI motor has 260 HP at the crank. NPI is about 225HP, so just doing the HEAD swap on your NPI you will
get you to 250 HP, then a CAI, tune, exhaust. You're talking a 10HP difference for 4 times the work to put
in the PI engine -vs- just installing PI heads. You'd be better off with a 4V swap if you really want HP
numbers for the work you're going to do for an engine swap. Basically, the heads (with cams) and intake
are what make it a PI engine.

There is no difference in exhaust manifolds between NPI and PI models. However, you may as well get
headers since you're gonna have the top end apart. This is a popular upgrade, and there are installation
instructions all over the net.

Going 4V is a lot of work too, and should not be done with the engine in the car, it will be tight, and a little
harder than PI heads. The heads are bigger, and the polarity of the coil-on-plug connections will have to be
switched. Even a heavily ported 2V can't match the stock flow of a 4V, so custom tuning will be required.

There is also the SVO 2v head. They are a bit pricey if new. If you can find a deal on a set of SVO heads, they
are the best out there. They outflow both PI and non-PI heads at all lift points.

WJL

if the question is will a P.I. motor fit in a 1996 through 1998, 4.6l Non P.I. Mustang, yes it will (all the 4.6l 2V engine blocks are the same 1996 through 2005 and you don't have to change the computer, you will need to use the original cam, crank sensors, TPS etc. so the connectors fit.

you will also have to add a second temp sensor in the crossover..

Doesn't matter F 150, Explorer, Lincoln, Crown Vic, they are all the same,including the aluminum blocks if you go that route try to get an 2004 or later they have the 8 thread spark plug holes, all the earlier ones only have 4 threads

Now this is a P.I. motor Years 1999 2005 not a 4 valve

Hope you find this helpful