2004 Mach 1 Engine:
Engine Type: MOD 32v DOHC Aluminum Block
Displacement: 4.6L
Power: 305 HP @ 6000 RPM
Torque: 320 ft-lb @ 4250 RPM
Compression Ratio: 10.1:1
Fuel Requirement: Premium 91 octane minimum
MPG: 17/25 (city/highway)

2005 GT Engine:
Engine Type: MOD 24v SOHC Aluminum Block
Displacement: 4.6L
Power: 300 HP @ 5750
Torque: 320 ft-lb @ 4500 RPM
Compression Ratio: 9.8:1
Fuel Requirement: Regular 87 octane
MPG: 17/25 (city/highway)

Stock Torque/HP curves ('05 GT in blue, '04 Mach 1 in red - NOTE not my dyno run!):


Mach 1 Engine:


GT Engine:



My take - I love DOHC technology, 4 valves/cylinder, and love the shaker hood, but performance is so close, and the added benefit of running 87 octane and having Variable Valve Techology - makes either one ok with me

 

I like the Mach as a car better, but the 05's engine has better heads. Do the 3v heads bolt on to the Mach engine? I'd imagine so, its the same aint it?

 

i really like the mach 1, in general, and though the 05's may seem nice now, if you look down the road, youll just be another 05, but a mach 1 kinda gives you an edge, no matter how you look at it performance, or in terms of how unique it is

 

I agree! How many people are bragging about owning an original '94 GT right now? lol

 

Well . .right now I think the Mach engine has a little more going for it from a modification standpoint. But only because of development for the past number of years. However . . The Mach takes 4 cams instead of 2 for the '05, which adds costs to modifications, and neither one can take much boost for long. (8-10 psi Supercharging seems about the limits for a "safe" F/I on the Mach, a little more for the 3-valve since it has a lower compression ratio [and add to the fact the 3-valve can run on 87 pump gas.]) The 4-valve has many variations and interchangable parts . .Ford GT heads will fit the Mach, as will the FR500 magnesium intake, and the FRPP FR500 cams.

I think the next step for the 3-valve will be if a bump in HP/TQ for a SE is launched, as well as how much MORE the aftermarket takes to the 3-valve. If Ford decides to go that route the 3-valve could surpase the 4-valve very soon.

Though, both engines are very strong.

This is a good debate and the merits for both engines are strong. I could go on about both engines, but let's have some ongoing discussion.

 

With performance of these powerplants being so close...

Arguements for the Mach 1' s Engine:
- Been around longer
- More Mods available
- DOHC

Arguements for the '05 GT Engine:
- Uses cheaper gas
- Cheaper to manufacture
- Has Variable Valve Timing

 

:scratch: I thought both motors used 87 octane?!?!?

 

both are great marvels of the mod 4.6 liter V8. Very refined, and powerful. very hard to choose from either. If going for aftermarket alone then the Mach1's powerplant is going to be the better choice, I also like how it breather really well throuhou the rpm range, I wonder what it'd do under the hood of the 05.

 

I didnt know about the GT heads fitting the Mach engine, I'd vote for the Mach as a better car anyday, just the engine preference is different, you get huge power jumps from porting the 3v heads

 

Man, I'm still contemplating on what I should do, but I think I'm gonna stick with the 05. In this section of the forum I was contemplating on trading in the 05 for an 04 Mach 1, but I've made my choice and as far as engine choice, the Mach's shaker hood system is sweet to look at, but I think the 05s 4.6L is a better choice.

Matt

 

I'd like to know where you got those dyno graphs, and how you know which is which, because if you ask me you've got them backwards! Either that or the Mach 1 is an automatic or in bad need of a tune! I have a dyno graph of my stock Mach 1, and it's more in line with what most Mach 1's show on a dyno.

 

Sure, the dyno's came from Modular Powerhouse.

The red is the Mach 1 and the Blue is the GT. I know this because the guy who did the testing said so in his post: http://forums.modularpowerhouse.com/showth...93&page=1&pp=15
I couldn't tell you if the Mach was an auto or badly tuned - according to guy who did the dyno's it was on par for other Mach's he dyno'd, which was the same one he used for the GT.

Yes - those numbers seem low, my buddy has an '04 Mach 1 and I've ridden and driven it and know it's a sweet car.
Perhaps his dyno is need of re-calibration? Elevation? Temperature? I don't think both cars were tested at the same exact time.

I used it because it is the only side by side comparison of a Stock Mach and GT, on the same dyno, I've ever seen posted anywhere. Not meant to be scientific by any means - the 2 curves are close enough to each other - though I do notice that both on your dyno graph and the one I referenced, that there is a slight, but noticeable dip from 5100 to 5500 RPM - any ideas why? I haven't noticed this same dip on other GT dyno's I've looked at - it seems to be flatter in that range.

 

I'm pretty sure those Mach numbers are from an auto. They seems to run in line with other stock Mach autos.

 

that was exactly my thoughts, both near the same power, it says the mach is suffering 5% more driveline loss than the 05, saying auto to me.

 

Dunno...I suppose some could ask the guy on the MPH forum - his name is "CobraKiller". But anyways - the curves are close enough for a valid comparison between the two motors. Aside from available mods, what other merits/short comings are there for either one? I know the '05 GT has non-forged internals, yet someone is running 15psi and getting 560 RWHP - it was posed on this board. I've heard 5-8 psi is what is considered "safe" for the GT's motor - what is it for the Mach with the stock setup?

 

Anybody running 15lbs of boost on a stock internals 05 GT has just pulled the pin on the grenade! It's going to blow, just a matter of when. The Mach 1 4V is not a particularly good platform for supercharging, because of it's high compression and non-forged pistons and rods. I've been told that 8lbs is the max on a Mach 1 motor, but that some have blown even at that level. I decided to go with nitrous as my power adder. With a 100 shot and a good tune, this car puts down over 400rwhp and 500+rwtq. That's more than enough to surprise the heck out of even some modded 03/04 Cobras on the street. High compression motors take to nitrous much better than to supercharging.

 

I see, so even 8 psi is playing with fire. I have a link to a vid of guy running - I think 10psi on his Mach and out-running a Cobra with relative ease. I'll post if it if I can find it.

 

I believe if the Mach were a manual in that dyno that it would have a slight advantage over the 05 GT engine. I believe the Mach's have a better power band than the 05 GT's engine, but they are so darn close. Both engines are fantastic, but if I had to chose I would go with the 4.6 4 valve engine.

 

I'd love to have the 4v 5.0L Cammer in mine

 

Now that would win the competition hands down