03 cobra question

[1FASTws6]

is it true that the 03 cobra and the 03 GT40 have the same engine. My friend said that the GT40 has the cobra engine but... has a more powerfull supercharger, higher compression ratio, and the body is made outta carbon fiber. Is this true?????????? thanks

[01L2Cobra]

Not its not ture. Nothing is shared from the Ford GT and the 03/04 Cobra. The GT500 only shares the same heads as the Ford GT.

[TheStang00]

Originally Posted by 01L2Cobra

Not its not ture. Nothing is shared from the Ford GT and the 03/04 Cobra. The GT500 only shares the same heads as the Ford GT.

same block to isnt it?

[01L2Cobra]

No not by far!!!!
For starters the GT has an Aluminum block while the GT500 is heavy ass heat retaining pig iron. The GT also has a dry sump where as the GT500 has a wet sump.

[TheStang00]

Originally Posted by 01L2Cobra

No not by far!!!!
GT is Aluminum GT500 is pig iron

oh yeah... good call i forgot

but isnt it the same design

[Whathits14]

Same displacement. (gt500/gt40=5.4L, 03/04 Cobra=4.6L) Thats about it.

[01L2Cobra]

It does share the same displacement and I believe compression. The crankshaft is possibly the same the but remember that some of the first GTs had major issues with theirs you can blame Roush on that one. There is a sensor boss formed in the timing chain cover less than 3/8" from the pulley lip on the GT500 and there is no such sensor boss on the GT. The mounting points for the alternator are also different. On the GT the alternator is located on the top of the engine just like the non SC cobras. The GT500 has its alternator located on the side of the engine just like the 03/04 cobras. The belts are also routed completely differently in the two cars as seen in the pics below.

Ford GT


GT500

[Muscletang]

The 2000 Cobra R and the Ford GT have the same engine. Well, it's not the exact same but they both have a 5.4 DOHC engine.

They may be very close though. The 5.4 N/A is pumping out 380. I think 170 hp could be reached with 14 pounds of boost.

[01L2Cobra]

Originally Posted by Muscletang

The 2000 Cobra R and the Ford GT have the same engine. Well, it's not the exact same but they both have a 5.4 DOHC engine.

The 2000 Cobra R is yet another totally different 5.4. The R used the 5.4 DOHC Navigators heavy ass heat retaining pig iron block. The heads on the R were totally unique and not even sold by FRPP. The compression ration for the 2000 R was 9.60:1 the GT has a compression ration of 8.4:1.

[Muscletang]

Originally Posted by 01L2Cobra

The 2000 Cobra R is yet another totally different 5.4. The R used the 5.4 DOHC Navigators heavy ass heat retaining pig iron block. The heads on the R were totally unique and not even sold by FRPP. The compression ration for the 2000 R was 9.60:1 the GT has a compression ration of 8.4:1.

Different? Yes.

Totally different? I wouldn't go that far.

When you get down to it, it's still the same engine. You can change bores, strokes, intakes, heads, cams, ect but it's still the same design. This is why the new LS-7 is still a Chevy small block that has been around for over 50 years.

[01L2Cobra]

Yes parts can be shared but they can also be shared with the 4.6. The all three 5.4 blocks are different when you get right down to it. The mod motor is not near as success full as the Chevy LS-X engine. The mod motor is way to heavy and not capable of the same kinds of power with out the addition of a power adder. Can Ford produce an engine capable of more than 400hp without the aid of a SC? Well yes a no. Yes they is the CAMMER that produces 425hp but it is so unreliable it will never make in to a production car or even be given a warranty from FRPP.

[Joshta]

What parts can be shared with the 4.6 and 5.4? is it just the heads, or more?

[TheStang00]

Originally Posted by 01L2Cobra

Yes parts can be shared but they can also be shared with the 4.6. The all three 5.4 blocks are different when you get right down to it. The mod motor is not near as success full as the Chevy LS-X engine. The mod motor is way to heavy and not capable of the same kinds of power with out the addition of a power adder. Can Ford produce an engine capable of more than 400hp without the aid of a SC? Well yes a no. Yes they is the CAMMER that produces 425hp but it is so unreliable it will never make in to a production car or even be given a warranty from FRPP.

well i dont think thats worded properly... im sure they are capable of producing a motor that produces that kind of power while being reliable, if they have is another story. and its not likely going to be a mod motor, but the 5.4 has shown the capability with the cobra R to produce some inpressive power. is the 6.4l v10 a mod motor? that produced well over 400hp... over 600hp, but you know that. and its a smaller engine than the ls7 too that is making 500hp, now if its to heavy is a totally different issue, but it is aluminum is it not.

[01L2Cobra]

The V10 is not a mod motor and there are still issues with it and that is one reason it was not used in the GT and is one reason why the GR-1 will not be built. Even the 2000 R didn't reach the 400hp mark. The mod motor is way outdated under powered and too heavy.

Let’s take a look at a couple of engines.

2001 Ford Cobra
Weight: 614lbs
Displacement: 4.6L
HP: 320

That’s 69.27hp per liter or .52hp per pound

2005 BMW M3
Weight: 326lbs
Displacement: 3.2L
HP: 333

That’s 104.06hp per liter or 1.02hp per pound


Now let's look at a real over achiever

Honda S2000
Weight: not to sure about this one
Displacement: 2.2L
HP: 237

That’s 107.73hp per liter

These are all DOHC engines and as you can see the Ford Mod Motor is defiantly under powered for its size and extremely over weight.

Sources
http://www.fordracingparts.com/parts...tKeyField=6229
http://www.bimmerforums.com/engine_faq/
http://autos.yahoo.com/;_ylc=X3oDMTF...RzbGsDYXV0b3M-

[TheStang00]

hp per liter doesnt mean shit. thats all there is to it. weight does though, along with torque, which is something the s2000 doesnt have. proof that hp per liter doesnt mean shit, ls2, ls7. both are compact and lightweight, and get better gas milage than many lower powered engines. most likely better than that bmw engine. the fact that the 4.6 isnt high on hp/liter just means that ford hasnt dumped truck loads of money into, or like you said the technology is to old. but hp/liter alone doesnt make it bad. i must say though the mod motor does seem unusually large and heavy for being only 4.6l of displacement.