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post #1 of 9 (permalink) Old 01-23-07, 10:13 AM Thread Starter
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Question Pi Cams In Non Pi Heads

Can You Upt A Set Of Pi Cams In Non Pi Heads

And If So Is There Any Modificiations Needed Or
Special Treatment Have To Be Done????

THIS IS A 97 4.6L
SINGLE CAM

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post #2 of 9 (permalink) Old 01-25-07, 07:18 AM
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Re: Pi Cams In Non Pi Heads

I don't think the cams are different, the difference is in the combustion chamber, and intake ports. You would gain more horsepower in your 97 by swapping PI heads on your engine and not just the cams.
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post #3 of 9 (permalink) Old 01-25-07, 07:19 AM Thread Starter
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Question Re: Pi Cams In Non Pi Heads

How Much Do You Gain Just With The Cams???
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post #4 of 9 (permalink) Old 01-25-07, 07:23 AM
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Re: Pi Cams In Non Pi Heads

Its not the CAMS that are diffeent. its the HEADS that are different. You won't gain any thing with just a cam swap.
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post #5 of 9 (permalink) Old 01-25-07, 07:57 AM Thread Starter
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Re: Pi Cams In Non Pi Heads

O I See

From What I Have Been Reading They Said The Cams There Self Was Supposed To Be Worth Like 15 To 20 Hp....

Do You Know Where I Could Find The Specs For These Cams????
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post #6 of 9 (permalink) Old 01-25-07, 08:25 AM Thread Starter
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Re: Pi Cams In Non Pi Heads

OK HERE IS WHAT I HAVE FOUND.........


NON PI-----

1996 4.6 SOHC 215HP Mustang Engine
Throttle body: 65mm (2.559 inches)
Intake manifold: composite, cast No. F6ZE-CG

Cylinder heads: cast No. RF-F5AE-AE

Combustion chambers: 49.77cc

Valves: 1.752/1.339 inches

Rockers: roller type, w/1.80:1 ratio

Camshaft lift: .473/.473-inch lift

Compression ratio: 9.30:1

Pistons: hypereutectic w/.153-inch dish




PI----


1999 4.6 SOHC 260HP Mustang Engine
Throttle body: 66.8mm (2.630 inches)

Intake manifold: composite, cast No. XR3E-DC

Cylinder heads: cast No. RFXL3-CZOD

Combustion chambers: 42.40cc

Valves: 1.752/1.417 inches

Rockers: roller type, w/1.80:1 ratio

Camshaft lift: .505/.534-inch lift

Compression ratio: 9.30:1

Pistons: hypereutectic w/.188-inch dish


SO THERE IS A LITTLE DIFFERANCE THEN IN THE LIFT...
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post #7 of 9 (permalink) Old 01-25-07, 11:39 AM
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Re: Pi Cams In Non Pi Heads

So I seemed to eat my own words. I checked my Ford manuals and found the same info you have found. But ask any engine builder the cam spec that gives you power is cam duration. ( how long the valve is open) that's were the power is. I work for ford and they do not print the duration so I'm not sure. But do you see the combustion chamber spec you wrote down the PI heads actually have a smaller combustion chamber that's were ford got the extra power compared to 1996 to 1998 engines. Now like I said If you were to put these heads on your engine you'll see an extra 40 to 60 horsepower because the 96-98 engines have flattop pistons and the 99-up engine have dish-type pistons. So your engine would benefit from bigger intake ports and a raised compression ratio. Sorry for being short earlier.
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post #8 of 9 (permalink) Old 02-09-07, 09:37 AM
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Re: Pi Cams In Non Pi Heads

I'm pretty new to the mod engines but I would think that installing PI heads on a non-PI motor would raise the compression ratio since it would have the small chamers, with less dished pistons. So would you have to run higher grade gas to prevent pinging or would it cause any other problems? To get a good combo, seems like you would have to change the pistons too.
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post #9 of 9 (permalink) Old 11-01-07, 11:00 PM
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Re: Pi Cams In Non Pi Heads

I recently read about a build-up using a non-pi engine using some SHM ported pi heads and comp-cams and making over 400 hp
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