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#1949288 - 01/06/10 04:07 AM Differences between P71 engine and standard 4.6??
chico_mustangs Offline
Rookie

Registered: 01/05/10
Posts: 81
Loc: NorCal
Ok I'm sure this has been asked a million times but I searched and couldn't find anything. What is the difference between the engine in the P71 and either the Civilian Vic or the Mustang? I know the pulley routing is different but I am talking about internally. I know the 01+ Mustangs have the Romeo block and I believe the P71's have a Windsor block but could someone clarify this for me? I am planning on keeping my 03 Vikky for a while and want to do either an 03 Cobra swap or I've got a Windsor block and will build it like I did my 'Stang.
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Way to many P71 Vic's
526whp 01 GT Mustang and counting...

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#1949292 - 01/06/10 04:14 AM Re: Differences between P71 engine and standard 4.6?? [Re: chico_mustangs]
Street_Shark Offline
Over the Hill

Registered: 05/27/09
Posts: 4101
Loc: Rain City
i thought Windsor just refers to Windsor Ontario were the engine is assembled. and romeo is also a location of an assembly plant

i think there the same specifications
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#1949295 - 01/06/10 04:19 AM Re: Differences between P71 engine and standard 4.6?? [Re: Street_Shark]
chico_mustangs Offline
Rookie

Registered: 01/05/10
Posts: 81
Loc: NorCal
 Originally Posted By: Landyacht
i thought Windsor just refers to Windsor Ontario were the engine is assembled. and romeo is also a location of an assembly plant

i think there the same specifications


No actually the blocks are VERY different, the Windsor is a much stronger block. The Romeo can't hold nearly what the Windsor can. If you set the blocks next to each other you can tell the difference. Also the Romeo heads are better then the Windsor heads, the cam towers secure the cams much better and have more threads in the spark plug holes. When I built my Mustang I didn't know the difference until I tore my factory Romeo down, and then tore an older extra Windsor I had apart. So needless to say I used the Windsor block with the Romeo heads. Oh and also the Windsor cam guides are much better then the Romeo's.
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Way to many P71 Vic's
526whp 01 GT Mustang and counting...

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#1949299 - 01/06/10 04:30 AM Re: Differences between P71 engine and standard 4.6?? [Re: chico_mustangs]
b1kfd Offline
Over the Hill

Registered: 10/16/08
Posts: 3590
Loc: Mississippi
Someone correct me if I'm wrong, but I think the differences you're talking about are because of the year model, not where the engines were built.
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2001 p71 former Jefferson County, Mo Sherriff Deputy's car, 2005 Ford Freestyle (wife's car) 1992 pos Nissan pickup, 1989 Kawasaki ZX10 Ninja.

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#1949311 - 01/06/10 05:23 AM Re: Differences between P71 engine and standard 4.6?? [Re: b1kfd]
chico_mustangs Offline
Rookie

Registered: 01/05/10
Posts: 81
Loc: NorCal
 Originally Posted By: b1kfd
Someone correct me if I'm wrong, but I think the differences you're talking about are because of the year model, not where the engines were built.


No its where they were built, because the Windsor has a big W in the casting of the block. I know in 99-early 01 had Windsor engines and late 01-04 they put Romeo's in the Mustang. Also when you order an engine from MMR for example it says either you can get an 03-04 Cobra block or a Windsor block, the Romeo is not an option because of its lack of strength. You could be right though because I don't know if they made a Romeo for anything in the 99-01's so I don't know for sure, all I know is the strength differences.
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Way to many P71 Vic's
526whp 01 GT Mustang and counting...

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#1949354 - 01/06/10 08:40 AM Re: Differences between P71 engine and standard 4.6?? [Re: chico_mustangs]
Bangster Offline

Poobah

Registered: 11/30/01
Posts: 9397
Loc: Tucson Az
Difference between same year civilian and p71 engine is the oil filter adapter (of things actually bolted on). Other external differences would be the oil cooler attached to said oil filter adapter and unless it is a 98, the alternator.
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00 Grand Marquis LS Premium - 97 Cougar 4.6 Sport - 89 Cougar LS - 63 Falcon 302 - 82 F-150 - 97 Mark VIII LSC - 2017 Escape SE - 2012 Fusion Sport AWD

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#1949401 - 01/06/10 09:57 AM Re: Differences between P71 engine and standard 4.6?? [Re: Bangster]
gord_bolton Offline
Over the Hill

Registered: 05/06/02
Posts: 4691
Loc: Saskatoon, Saskatchewan
The Cobra is a 4 valve per cylinder engine. The bottom end is also built heavier. Panthers other than the Maurader have two valves per cylinder.

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#1949544 - 01/06/10 01:03 PM Re: Differences between P71 engine and standard 4.6?? [Re: gord_bolton]
chico_mustangs Offline
Rookie

Registered: 01/05/10
Posts: 81
Loc: NorCal
 Originally Posted By: gord_bolton
The Cobra is a 4 valve per cylinder engine. The bottom end is also built heavier. Panthers other than the Maurader have two valves per cylinder.


Yes I know that about the Cobra but the blocks are interchangeable.
_________________________

Way to many P71 Vic's
526whp 01 GT Mustang and counting...

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#1950831 - 01/07/10 11:48 PM Re: Differences between P71 engine and standard 4.6?? [Re: chico_mustangs]
chico_mustangs Offline
Rookie

Registered: 01/05/10
Posts: 81
Loc: NorCal
Anyone?
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Way to many P71 Vic's
526whp 01 GT Mustang and counting...

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#1950842 - 01/08/10 12:12 AM Re: Differences between P71 engine and standard 4.6?? [Re: chico_mustangs]
Interim Offline

Evil Socialist Dem.
Posting Addict

Registered: 01/01/09
Posts: 15397
Loc: West Linn, OR
I'd go the build route. Built engines are always better because you know what is going on. Tossing the Cobra engine in there will require all that and more. By the way are you actually in Chico?
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#1950905 - 01/08/10 03:58 AM Re: Differences between P71 engine and standard 4.6?? [Re: Interim]
Bangster Offline

Poobah

Registered: 11/30/01
Posts: 9397
Loc: Tucson Az
Not sure what part of your question you didn't already know or get the answer for. There is NO difference from a same year civilian or p71 engine. They are all Romeo, went to PI in 2001.

For a mild motor the Windsor aluminum block in the Explorer is fine, not as good as the Teksid block from the Mark VIII. There might be some issues using the Crown Vic front cover, not sure about that. I know that you had to use a different year front cover on a 96/97 Thunderbird if you put in an Explorer block due to the size of the bolts.
_________________________
00 Grand Marquis LS Premium - 97 Cougar 4.6 Sport - 89 Cougar LS - 63 Falcon 302 - 82 F-150 - 97 Mark VIII LSC - 2017 Escape SE - 2012 Fusion Sport AWD

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#1951278 - 01/08/10 05:58 PM Re: Differences between P71 engine and standard 4.6?? [Re: Bangster]
1Fastvic Offline
Climber

Registered: 07/20/09
Posts: 680
Loc: Florida USA
you can tell the difference between the romeo and the windsor by the amount of bolts on the valve cover and im not sure of the internal differences.
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1FastVic- 2001 P71, magnaflow custom exhaust, trick flow plenum, 75mm throttle body, Jmod, B&M Electronic Shift Improver, Gutted Cats.
Coming Soon: 3.73, drilled and slotted rotors, marauder intake, new head gaskets and oil pan gasket.

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#1951538 - 01/09/10 12:28 AM Re: Differences between P71 engine and standard 4.6?? [Re: 1Fastvic]
SVT_Merc Offline
Member

Registered: 04/07/08
Posts: 445
Loc: Cape Coral, FL
All 4.6 internals are the same!!! The only exception is on any engine built from the factory with 4 valve heads, they used stronger internals (forged as opposed to cast).
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#2400317 - 11/03/11 10:43 AM Re: Differences between P71 engine and standard 4.6?? [Re: chico_mustangs]
96TC Offline
Member

Registered: 01/15/11
Posts: 337
Loc: CT
Originally Posted By: chico_mustangs
Ok I'm sure this has been asked a million times but I searched and couldn't find anything. What is the difference between the engine in the P71 and either the Civilian Vic or the Mustang? I know the pulley routing is different but I am talking about internally. I know the 01+ Mustangs have the Romeo block and I believe the P71's have a Windsor block but could someone clarify this for me? I am planning on keeping my 03 Vikky for a while and want to do either an 03 Cobra swap or I've got a Windsor block and will build it like I did my 'Stang.


The windsor has a different block, crank, and heads. The difference is the main bearing caps, the main bearings and the way the main bearing caps are attached to the block, they use either use Jack screws or Dowels. WEP also use 10mm bolts on the bottom of the timing chain cover instead of 8mm. The cranks are different, the windsor uses a high nodular iron cast 8 bolt, (like a 289 Hi-Po), and the Romeo a 6 bolt cast. You can use the 8 bolt in REP with some clearance adjusting. WEP heads use 13 bolt valve cover bolts & REP uses 11. WEP has no bearing cages on the main cam bearings and REP does.
I just completed an engine build for my 96 TC using a 99 WEP block, 8 bolt crank, and REP heads. I too believe this is the cheapest and strongest way to go using stock cast iron parts, (block & crank).
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1978 Cobra II Black on Black 302 4spd AC PDB PS
1996 Lincoln Town Car Signature Ride Control Package, 99 WEP engine from Steve Shrader's Brightmare,

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#2400332 - 11/03/11 11:10 AM Re: Differences between P71 engine and standard 4.6?? [Re: chico_mustangs]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 19868
Loc: I can see Detroit from here!
All Panthers you will ever come across have Romeo Engines from the factory.. Identified by a W in the vin number after the chassis id (IE P71W or M74W in the vin). Supposedly there were a small number w/ Windsor engines (would be ID by a 6 in the vin in place of the W), but IDK of anyone who's actually seen one.
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-Steve

2006 Audi A6 ~132k miles, stock.
1998 Mercury Grand Marquis LS HPP ~100k miles, slowly acquiring modifications.
1997 Town Car Cartier ~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit, Dual exhaust with Magnaflows, cats deleted, MSD Ignition, KYB Gas-A-Justs, P71 front bar, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown

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