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post #1 of 7 (permalink) Old 09-07-10, 12:30 AM Thread Starter
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4.6 sohc engine swap to a p71..questions?

Looking to swap my engine soon to a p71..Its a 94 vic so im looking for some feed back whats gnna change as far as external hookups?? Transmission..etc..fuel..computer..Do they make wire harness fore these swaps?

Thanx..

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post #2 of 7 (permalink) Old 09-07-10, 06:20 AM
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Re: 4.6 sohc engine swap to a p71..questions?

You do know that the police, taxi, and civilian cars all have the same engine with minor differences in set up, right? Add a dual exhaust system to your car and rip out all the carpeting and you'll almost have a P71.

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post #3 of 7 (permalink) Old 09-07-10, 11:24 AM Thread Starter
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Re: 4.6 sohc engine swap to a p71..questions?

I kinda knwe the engine was similiar..so maybe jst put some pi heads on my existing engine would be fine then.
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post #4 of 7 (permalink) Old 09-07-10, 01:18 PM
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Re: 4.6 sohc engine swap to a p71..questions?

Quote:
Originally Posted by 94burgundyvic View Post
I kinda knwe the engine was similiar..so maybe jst put some pi heads on my existing engine would be fine then.
That's just a waste of your time for so little gain. If you're going to do heads, put some trick flows on there. This engine also has an aftermarket throttle body setup you can do. Right away, you could do steeper gears and a high stall converter with exhaust and that will wake her up.

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post #5 of 7 (permalink) Old 09-07-10, 06:45 PM
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Re: 4.6 sohc engine swap to a p71..questions?

exhaust and gears would wake up the car the most... unless you wanna buy the expensive 4.6L stuff to mod the engine... main reason i am taking out the 4.6L and installing a 5.0L in the fiance's car since it was the early '92 that still has the AOD transmission in it. the 5.0L is cheaper to maintain and mod then the 4.6L ... plug wires (Ford Racing for 5.0L from ebay $35) (4.6L cheap wires $53)


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post #6 of 7 (permalink) Old 11-24-11, 05:32 AM
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Re: 4.6 sohc engine swap to a p71..questions?

These guys are all correct!
"Modular Technology" is at play here.
Same engine in all versions (except the Marauder), different PCMs, trannys', gear ratios, as well as add ons or omitions of certain parts like oil coolers or speed sensitive steering.
Go and find yourself a PCM for a P71 and go from there.
Remember, a P71 motor only puts out 20hp more than yours.
Faster take off can be attributed to the lower gear ratio.
If your looking for 300hp like what's in a Marauder, well, go and get yourself a Marauder. All the mods you'll need to get yourself there will add up to the cost of one in the end.
Good luck in your quest.
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post #7 of 7 (permalink) Old 11-24-11, 07:20 AM
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Re: 4.6 sohc engine swap to a p71..questions?

Have you considered a 5.4? They are easily modified for a substantial boost in torque and HP, and they can fit under a stock hood with an aftermarket low profile intake manifold. Stock engine mounts work and the stock dual exhaust bolts up with minor mods to the "H" pipe.

Keep in mind what you are building the car for. Are you are building a weekend "toy" or is this swap for a daily driver "sleeper"? These are heavy cars and a 4.6 just doesn't have the torque (torque is what accelerates the car, not HP) to move off the line without going to rear gearing that will destroy anything close to decent gas mileage. A "warmed over" 5.4 will run 14's all day long, be reliable, and get mileage in the teens for everyday driving without pegging redline in every gear.

Don't forget to make sure your trans is up to handling the extra power. Softer accumulator springs and drilling out the separator plate (up to .100, depending on year) for increased fluid flow will result in longer trans life and quicker shifts without the hard (bang!) shifts usually associated with higher line pressure. Again, these mods are for an everyday driver. Don't forget brakes and suspension. A P71 or Sport is a good platform to start on and just the thing for showing Euro machinery drivers the blue oval on your trunk.
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