Uh, I'd say a good 1,000 to 1,500 pounds, depending on what their race weight is. Reason: Lightnings are trucks. Trucks are like the fat kid in dodge ball, not too many people pick them because they are slow. Because of weight and wind resistance you need the torque, while mustangs and the sleeker and lighter forms, and they can use 4 valve (like Hondas, understand?)

God, they never said anything about that in math class. I've never heard of this (not to say this isn't 100% correct, as it may be), but what sense does that make? RPM does not change depending on engine or anything, it will always mean revs per minute. I would prefer an explanation or logic or something.

 

the 2v i am referring to was built to rev over 7000 also

it's all in what you build,

i was never a big torque person, but seeing what these roots can do compared to the centrificals now, i'd much rather have had one back when i built my cobra

what i'm saying is, when you have 2 cars making equal hp and 1 is making almost 100 more ft/lbs

that car is going to e.t. better, more than likely anyway

 

oh, i seemed to have switched sides. i really wanted some 4 valve heads (4v 5.4 makes 300 vs 260 hp and 355 vs 350 ft/lbs torque) and shouldn't you need better flow for a supercharger?

after this thread though I think I'll wait it out (or get Cobra R heads. Anyone have extras that takes bad personal checks?)

 

Ok Mr Smart ***...

If you know anything about a 4V motor, it spins higher, obviously. So, how are you going to compare torque figures to a 2V motor when the engine is making more HP up top and the torque is equally spread across the powerband, except when you pull past 6500 RPM where torque falls off on a 4V and HP peaks out? 4V's spin 1000 rpm more then a 2V. Built 4V's spin almost 2000 RPM mroe then a 2v. Ive also seen 2V's spin to 7 and 8K. So they make more torque then a 4V at the range? Nope, not even close.

2V's fall on their *** in the upper 5K range of RPM as you put it and a 4V is just taking off at that RPM

Fastest stangs in the US are running 4V motors genius, so why is that? they are making more torque at the same rpm as a 2v. What happens when looking at a Dyno sheet and seeing the RPM meet the HP curve at 5250 RPM? Unfortunately, Dyno's arent the tell tale answer when ET's speak.

 

Exactly, whichever combo you choose will affect hp and tq.

Roots have come along way since that joke of a kit put out by KB back in the 96-98 Cobra days where 330RWP was about all you were going to extract from that heat pump.

You just cant compare a 2V to a 4V without getting lost in engine specs. One shows higher torque whereas the other shows that torque spread equally across the entire powerband.

TQ has never been the high side of the 4V. However, its ability to rev has always been in its favor and is especially important when using centrigual blowers.

 

Look at the Cobra R heads, then go check out the Gator heads.. You will change your mind on the R heads.

Ill take a set of 03 Cobra heads myself. You guys can keep the Cobra R, Gators and FR500 heads.

 

i'm sure coolness factor would be major, but in the end, cost vs hp on lightning combo's i just don't see it being anything close to worth it,

it would be like long tubes times 4 or 5

 

I couldnt agree more...

It would make one hell of a Silver State Classic runner for top speed though

 

I agree that at this point a 4 valve truck engine is more work/cost than reward, but somebody has to start somewhere or we would still be running the 5.0.

 

Aryton, i see you posting on Modular Fords and i know you seen the pic of JR Grantilli's 5.4 Mod that makes 1600 hp with a turbo. And its a 4V.

 

Yes I have...

 

Don't forget that we are going to use a 5.4L which will still rev under 6000 rpms, and has a much longer stroke for added torque, not a high revving 4.6L, short stroker.

Back to the math. Torque #s should come in at over 900 also. (913)

 

What's the boost level on that thing?

 

I have seen that car on video.... that thing is sweeT!!!!!

 

I think he is between 28-35 psi. He is supposed to be out here for FFW in Nov.