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post #1 of 10 (permalink) Old 07-30-2003, 08:21 PM Thread Starter
 
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Question about the SC engine and 3.8

Hey guys i was wondering if you could help me out on this....

I'm looking to convert my 3.8 n/a engine from my 89 bird into a SC engine. I need to know what I need to do in order to make this conversion work or if its even possible. If it does work, would the transmission bolt up directly or would I need to modify it? I appreciate your help in advance, thanks.
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post #2 of 10 (permalink) Old 07-30-2003, 08:27 PM
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in shorter words, it will cost less to swap the whole sc motor into your car.

The words of Duffy Floyd.

Super Coupe Club of America > SC Literature > Ever wonder what changes Ford made to the standard 3.8 L engine to turn it into an SC?

submitted by Duffy Floyd
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Here is a synopsis of the changes made by Ford for the Model year 1989 to make the standard 3.8L Engine into the SC version we all love (and hate at times).
To allow for the additional power generated by the engine there were new designs for reinforcement made on the following components:

Block
Main bearings
Crankshaft Bearing Caps
Crankshaft (Dura-cast initially and forged steel for the majority of the production run)
Steel crankshaft sprocket
Timing Chain
Cylinder head
Head bolts
Rocker arms

The throttle body was designed new for the SC motor.

Water routings in the engine were redesigned for the SC motor.

Intake Manifold:

Of course to accommodate the supercharger the intake manifold was changed to provide a way to mount all the upper engine components such as the SC, air bypass valve, inlet plenum etc.

Exhaust Manifold:

These to were redesigned for the SC version. Each side houses a Heated Exhaust Gas Oxygen sensor (HEGO). The use of the HEGO allows accurate sensing of O2 level in a lower temperature exhaust gas (200C- 392F) when compared to a EGO (unheated) sensor. On the SC the HEGO sensor on the right side is located in the exhaust pipe just downstream from the exhaust manifold for that side. On the left side the HEGO is located in the exhaust manifold itself.

Cylinder Block:

The cylinder block was redesigned and reinforcement was added to increase durability and strength of the block. The water passage opening locations were also moved.

Both the ATX and MTX camshafts (Automatic transmission equipped cars and Manual transmission equipped cars) were redesigned to allow for newly designed roller tappets. Roller tappets have the advantage of reducing sliding friction and improving fuel economy. Because of the choice made to include the roller tappets it was necessary to include guide plates and retainers to secure them.

The main bearing caps were made one inch taller and the cap bolts were increased in length to allow the caps to be secured properly to the block.

Initially Ford planed to use an improved method of manufacturing the crankshaft to add strength to the unit. It was referred to as Dura-cast. Due to production issues with the Dura-cast process, the vast majority of SC cranks were forged steel. Note that if you rebuild your SC Motor?the main journals can only be refinished to 00.25mm (0.010-inch) undersized and the rear main journal can not be refinished since it is already 0.010-inch undersized. The reason for the undersize rear journal was to prohibit any standard cast iron cranks being run down the line in an SC engine which would surely result in a warranty problem. If a standard crank would possibly be tried in a SC short block, the main bearing caps would not bolt down properly.

The balance shaft used on the standard 3.8 L (a feature used to reduce engine vibration) was eliminated and replaced by a spacer in place of the balance shaft drive gear.

A knock sensor was added to increase ignition performance. This is a piezoelectric accelerometer sensor that is designed to vibrate at the same frequency as the engine knock (pre-detonation). The sensor operates in consort with the EEC IV engine control system to retard ignition timing and hopefully eliminate the detonation before real engine damage occurs. If you ever have to replace one make sure you get the correct version since there are sensors made for at least 4 different frequency ranges depending on the application.

The rear main oil seal was modified to improve the sealing characteristics and to provide more durability. Some of you may have experienced rear oil seal failure in other Fords. Before approximately this vintage engine for Ford, the seals were mainly two piece and over time the rubber seal would actually wear a groove in the steel crank. The only true fix was to replace the crank. Now with this redesigned seal it is a one-piece unit which allows the use of a "sealing ring" which can be installed over the groove and allow a new seal to be installed and the leakage to be stopped.

Cylinder Head:

The cylinder head was redesigned to increase the bolt boss diameter and deck thickness. The water passages (between the cylinder head and block( were revised to improve the sealing between the two components. The valve springs were improved by strengthening and made smaller in diameter. The spring seats were changed to accommodate the new spring design.

The cylinder head bolts are larger and have been made stronger.

Crankshaft Damper Assembly:

The crankshaft damper was changed to a cast aluminum piece to reduce weight.

The rear of the damper was fitted with a cutter for the Distributorless Ignition System (DIS) system. It has three vanes which when passing past the block mounted Profile Ignition Pick-up (PIP) sensor generates a signal to both the DIS Module (mounted on the top of the engine beside the Ignition coil pack) and the Electronic Engine Control Assembly (ECA {EEC IV Module}) and gives the base spark timing.

Camshaft:

There were two different types of camshafts designed. Automatic and manual transmission cars each had their own unique camshafts. They were color coded yellow for the ATX version and pink for the MTX version. The paint was applied to the rear end of the camshaft.

Timing Chain Tensioner:

A tensioner and corresponding snubber were added to the engine.

Pistons:

The piston domes for the pistons were redesigned to increase the performance. The pistons were also constructed of high silicone aluminum (hypereutictic). The compression ratio was 8.2:1.

Oil Pan:

The oil pan was diecast to reduce noise and vibration.

The oil level sensor was modified to also double for an oil temperature sensor.

Oil Cooler:

A Modine oil cooler was added to increase both engine and oil life.

Valve Covers:

The valve covers were diecast from magnesium for weight reduction.

Platinum tipped spark plugs were added for increased life and performance concerns of the engine.
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post #3 of 10 (permalink) Old 07-30-2003, 11:29 PM
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my 2ยข: buy a SC and keep the 3.8 as a beater car

White `90 SC - 39k mi For Sale
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post #4 of 10 (permalink) Old 07-31-2003, 12:56 AM
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Well you could swap the entire top half of the SC engine including DIS and some other electronics. But you'd have to get a bigger SC pulley to run lower boost and your engine life would be cut short unless you hardly use the gas pedal to it's full potential.
-Thomas

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post #5 of 10 (permalink) Old 07-31-2003, 06:42 PM
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Thomas......you can't just swap out the top half........the bottom is different too. It is a different block.

1997 LX Sport 4.6L 2.73 , MODS=SCT tuned/J-Mod/Trans Cooler/Dyno max Cat-Back/NgkPlugs/Mac cold air/March UD's/FRPP aluminumcarrier3.73's(spare for strip use)/ PI cams + PI intake manifold w/adapter plate/ Mark VIII Convertor/80mm L-Maf/70mm TB/ Mark VIII 1 piece shaft/Cobra R' wheels/ Kumhos 235/60/16 - White leather w/ blue cloth seats - white face gauges in 95 cluster
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post #6 of 10 (permalink) Old 07-31-2003, 06:55 PM
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Yes I realize this

But it's still possible. I'm just saying the bottom half won't last long.

-Thomas

1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner
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post #7 of 10 (permalink) Old 07-31-2003, 06:58 PM
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This is true.........although........would be funny to see first time that he dragged someone off the line............

Can you say.........blowout?

1997 LX Sport 4.6L 2.73 , MODS=SCT tuned/J-Mod/Trans Cooler/Dyno max Cat-Back/NgkPlugs/Mac cold air/March UD's/FRPP aluminumcarrier3.73's(spare for strip use)/ PI cams + PI intake manifold w/adapter plate/ Mark VIII Convertor/80mm L-Maf/70mm TB/ Mark VIII 1 piece shaft/Cobra R' wheels/ Kumhos 235/60/16 - White leather w/ blue cloth seats - white face gauges in 95 cluster
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post #8 of 10 (permalink) Old 07-31-2003, 07:17 PM
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If you plan on swapping the entire engine you could do the top half first and see how quickly you can throw a rod, then swap in the SC block haha.
-Thomas

1988 Notch Mustang: - 438W, direct port n2o, t56
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post #9 of 10 (permalink) Old 07-31-2003, 07:51 PM Thread Starter
 
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Damn man i dont want to purposly blow my 3.8 engine! gosh! lol maybe i will when i get the SC engine
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post #10 of 10 (permalink) Old 07-31-2003, 07:55 PM
 
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Hey Harley, can you PM me the specs on your engine? The Cobra one.
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