I have some engine questions

[atrainsgt]

I found a 03 cobra longblock I'm thinking about buying. It comes just like you see it in the picture below. My questions is what would I need to run this in a N/A application? 99-01 cobra intake or Mach 1 intake? 99-01 cobra timing cover and accessories? It also had a ticking sound in the lower end which the owner thinks was a burnt piston skirt, pulled off the oil pan and found a little bit of metal shavings. I figure I'm looking at a new piston, bore/hone and probably bearings while I'm at it. Let me know thanks!

 

[uncltrvlnmatt]

I would go with the Mach intake. You don't need to swap the timing cover. Unless you want to sell it. It is worth about $450.00 and is a very hard to find part when doing an Eaton swap.

 

[OnyxCobra]

With the low compression it wouldn't make much power, I'd look for a stock blower and slap it on there. You can find them for cheap.

 

[atrainsgt]

I could buy a eaton setup for about $800 but that's just the start of it, and while the whole termi engine swap thing is cool, that is A LOT more work than a simple 4v swap. I'm not worried about not making much power right now anyway. It will probably make over 260rwhp as it is which I think would be more than decent. It will be getting a vortech or Novi supercharger down the line as soon as money permits. So a mach 1 intake is now on my list.

 

[OnyxCobra]

I thought someone said that's what the n/a versions of the 4v 4.6 made, i know the 03/04 runs like 2:1 compression lower...

 

[atrainsgt]

The 03-04 mach 1's are running at around 290-300rwhp through a 5-speed.I can't imagine the loss in compression taking more than 30hp off of it.

 

[OnyxCobra]

Gotcha that just seems like a lot for a stock tune. I saw TxCobra put down around 290whp with a dyno tune and a few bolt ons and said he's pushin 9:1. He mentioned the stock Cobras are running 260-270whp and they're obviously set up to run n/a.

 

[atrainsgt]

You are thinking 96-98 cobra's. They do make around 260 stock. The newer cobra engines are closer to 300. Better flowing heads I assume.

 

[OnyxCobra]

the 99/01 Cobras were rated 15hp more than the 96-98 Cobras, and the mach1 had the same 305hp rating as the 96-98 Cobras, i don't think they're gonna make 40whp more based off that rating.

 

[atrainsgt]

I can't say I've seen a bone stock mach 1 or cobra dyno'd but I've seen several Mach 1's with just exhaust and CAI make over 290rwhp. Take a look through this thread if you are curious. Some cars in there are almost stock with just CAI, and exhaust(which is what everybody has anyway) http://forums.corral.net/forums/showthread.php?t=515518

I just decided against buying that engine anyway. My transmission just got A LOT worse than it was so I have to rush order that t56. I'm keeping my eyes open though. I think I want a 96-98 teksid block/crank with 03-04 heads, Manley forged pistons, and Manley forged H beam rods.

 

[OnyxCobra]

That's too bad man, those engines are solid. Either way i'm sure you'll end up with something good.

 

[atrainsgt]

If he still has it in a month I will go ahead and buy it. Right now I just don't have enough money for a T56 and the engine. Then I will only have to change the block out to a teksid.

 

[uncltrvlnmatt]

The 03/04 Machs are rated at 315 and 320HP the 96-98's are rated at 305hp. My bone stock 97 with a tune puts 258 to the ground. That is with 10:1 comp. Drop that down to 8:1 comp and you won't have poop for power.

 

[OnyxCobra]

Everywhere I look says 305hp for the mach1, either way it doesn't really matter...

 

[TxCobrA98]

i believe Uncle Matt is right in the numbers on the Mach1's.

those C heads really help out in the airflow department on the newer mod motors. i have longtubes, offroad hpipe, billit flywheel, flowmaster mufflers, JLT CAI, forged 99 teksid motor (with 98 heads and intake) and I made 289.5hp and 286.5tq. if i delete the IMRC's, i will be probably around 300-305hp.

Id say with the lower compression and N/A you could still look for about 280 horsepower. just my guess.

 

[OnyxCobra]

Somebody else do a quick search for the Mach1 rated HP, everywhere i look is 305 and i'm getting pissed lol

 

[atrainsgt]

Effect of Compression (8.3:1 vs. 11.8:1) Normally Aspirated 5.4L 4V.

Compression Ratio And Supercharger Build Naturally Aspirated

As expected, increasing the static compression ratio by 3.5 points had a noticeable effect on the power curve. Given that additional compression is always present, power gains were recognized throughout the rev range. The low-compression 5.4L produced 478 hp and 395 lb-ft of torque, while the 11.8:1 version upped the peak numbers to 543 hp and 439 lb-ft of torque. Note that the relative shapes of the power curves remained the same and the additional compression ratio simply elevated the entire torque curve.

Full article here http://www.musclemustangfastfords.com/tech/mmfs_070022_ford_compression_ratio/dyno_results.html

That's in a significantly more powerful engine than a typical N/A 4.6 4v so I would assume the hp loss in my application wouldn't be more than 20hp. So if that's the case I should still expect around 280rwhp on the high end. Coming from a low 200hp engine I will be happy with that until I get my blower.

 

[TxCobrA98]

my 290hp is plenty of fun for me :headbang:

 

[OnyxCobra]

]
my 290hp is plenty of fun for me :headbang:

heh give it a few weeks man...

 

[01SportChic]

I would definitely at least throw an Eaton on it. Either that or some kind of forced induction. To give you an idea for power loss from low compression, my car is supposed to have 10:1 with the cobra motor...with the GT short block that the car has in it now the compression is at about 9:1. Stock Cobra's are running 13.2-13.3 with a sticky tire, my best with a sticky tire, gears, fuel pressure adjusted, solid suspension and exhaust, I ran a 13.5. I'm not a terrible driver, either.

HP wise, the change in my compression lost me about 50-60hp. It may not seem like much, but if you think about n/a...it's a good amount.



/end of my nonsense rant lol