Are all 5.0 HO the same for diffrent years

mustangmike2003 · 01-09-2005

This thread is geting started from a contorversy that developed in another thread. I want to know the facts though, it seems that people only know the urbin leagons of the changes and nothing else. I want to know. I know in 93 there was a hp drom because of these facts.
1) the way ford rated HP changed
2) the computer was detuned (but the best of any year, sn95 5.0's are happer with one)
3) the cam profile was changed and detuned
4) the mas air screen waas more restrictive

Note: some guys were saying that the 93 HO recieved hypertunic pistons. God i hope thats not true. i have a 93 nad i want to buckle on a super charger

Jarrett · 01-09-2005

The correct answer is 1, Ford changed the way they rated engines.

Cam profile changed in 91, same power rating.

Computer changed in 94 to accomodate a 20 degree timing curve reduction during shifting to help the T5 survive behind the 5.0. That is why the 94-95 cars don't like powershifting like the pre-94 cars.

And they also changed to 93 pistons to hypers from the original forged design.

RobW · 01-10-2005

As you read in the other thread, hypereutectic pistons were used from April of 1992 on. No 1993 Mustangs got forged pistons, but that hardly matters really. The hypers work fine for most setups. I suppose it's possible the Cobra or Cobra R got forged, but I doubt it.

The most sought after computer is the A9L, used in 1989 through 1991 models. Later models may have gotten the same one, but I'm not sure. I am sure that by 1995, and probably with the 94's SN95 body change, a different computer was used. A "detuned" computer is never "best" when one is looking to gain HP, btw.

If the Mass Air Sensor screen was made more restrictive, I can't see how. The one used on earlier engines was able to stop anything larger than a gnat under WOT.

Ford's HP rating was changed, but I don't know of any cam change specific to 1993, aside from the Cobra's.

Stangboy5666 · 01-10-2005

I dont believe there were any changes in cam in 93 go here for some really specific info. http://www.mustanggt.org/91gt.htm There were many, many changes throughout 87-93. Some were very small such as spring sizes in the heads and whatnot and some were obvious like mass air, but there were so many changes by 93, Im not sure if anyone knows the entire story. Your 93 does have hypereutectic pistons though...sorry.

mustangmike2003 · 01-10-2005

WFT..man what a rook..well i guess when its time for the motor to go ill just dig a low milage HO out of a pre 93 mustang. BTW dose anyone know if forged pistons were used in any other cars other then mustangs?? its a dayly driver with a 6psi blower in the summer months.. the hypertuniq pistons and gaskets hold up with the low pressure blower. im not going to go HP crazy so im just going to pluck a used motor out of the junk yard when the time comes time. so guide me to picking the best motor... can i define a pre 93 motor vs a 93 and up HO by checking the casting numbers??

89lx5o · 01-10-2005

hyperneuitic pistons are fine up to about 10# of boost the pre 93 forged pistons are not the best forged pistons like aftermarket.....

My Grandpa and father have worked for ford for years and ive never heard anything about there being any differences in the 5.0h.o from 86-93 except mass air being added in 89 and hyperneuitics for 93 il see if i can dig up a tech manual from ford threw there files....

tmoss · 01-10-2005

The cam change was actually in August of 1988. Took ramp rate out of the cam. Made ~3HP less. In 91 Ford changed the depth of the hole in the cam snout was made deeper for the sproket retaining bolt and they gave the cam a new part number.

Stangboy5666 · 01-10-2005

Quote:

Originally Posted by 89lx5o

hyperneuitic pistons are fine up to about 10# of boost the pre 93 forged pistons are not the best forged pistons like aftermarket.....

My Grandpa and father have worked for ford for years and ive never heard anything about there being any differences in the 5.0h.o from 86-93 except mass air being added in 89 and hyperneuitics for 93 il see if i can dig up a tech manual from ford threw there files....

there were plenty of changes, granted they were small, but there were quite a few...

mustangmike2003 · 01-11-2005

well while im waiting why dont you guys tell me what a stock block can handle if preped right.. keep in mind it will be a street driven stock block. and what post 60s 302 block is the strongest... it would be imposible to find a block from my local junk yards thats older then mid 70s

Fordgazm · 01-11-2005

A stock block is safe up to about 500 hp . I would agree that your hyper pistons would be fine for 10 #'s or less of boost . Actually they would be fine for more if the tune was perfect . The reason most people use forged pistons is that they are stronger and therefore more forgiving to a bad or not optimal tune .

Stangboy5666 · 01-12-2005

I feel your pain Fordgazm about the playoffs...Im a rabid Seahawks fan...

tmoss · 01-12-2005

Quote:

Originally Posted by Stangboy5666

I feel your pain Fordgazm about the playoffs...Im a rabid Seahawks fan...

been there - but not this year - YET

We won't go all the way.