4.6 exhaust.....anyone have number comparisons for longtubes vs short tube headers???

[t500hps]

As the title says, has anyone made dyno pulls comparing the 2? I've always heard you need long tubes to "make the numbers" but what is the real world difference?

[ShadowBolt]

As the title says, has anyone made dyno pulls comparing the 2? I've always heard you need long tubes to "make the numbers" but what is the real world difference?

I have had long tubes since day one. Kevin Jander's car always made at least as much power as the 55 without them (most years he made more). If you run long tubes with the stock transmission that has the bellhousing made as one with the transmission you have to pull the engine to change the clutch. If I drive all the way to Hallett and lose a clutch on Friday I don't want to be going home just due to a bad clutch. This is why I run a Quicktime bellhousing and a T5 or A5 or TKO600 or TR3650. Every time I have an engine go South I ask myself why I still have the damn things on the car.

JJ

[t500hps]

On my 4.6 I have the stock T45 and longtubes. With the car on a lift we have been able to get the tranny in/out several times WITHOUT removing the engine/k-member.......but it is a BIT(H!!!!! Even the starter takes an hour just to find the top 2 bolts! I'm making a change and considering shorties if I can still make the numbers.

If I recall.....doesn't the 3650 have the bellhousing attached just like the T45. (actually it does because several buddies run them)

[ShadowBolt]

On my 4.6 I have the stock T45 and longtubes. With the car on a lift we have been able to get the tranny in/out several times WITHOUT removing the engine/k-member.......but it is a BIT(H!!!!! Even the starter takes an hour just to find the top 2 bolts! I'm making a change and considering shorties if I can still make the numbers.

If I recall.....doesn't the 3650 have the bellhousing attached just like the T45. (actually it does because several buddies run them)

You are correct on the 3650. I run a 3550.


So it is possible to change the clutch with long tubes and a T-45 but my point was you were not going to be able to do it at the track.

JJ

[t500hps]

You are correct on the 3650. I run a 3550.


So it is possible to change the clutch with long tubes and a T-45 but my point was you were not going to be able to do it at the track.

JJ

Agreed. I have a spare tranny and don't even bother bringing it with me.

[Supercharged111]

As a T56 owner I see no need to bring spare transmissions either.

[fscott]

I'm curious, what's the point of running long tube headers? Do they help to flatten/broaden the power curve?

[ShadowBolt]

I'm curious, what's the point of running long tube headers? Do they help to flatten/broaden the power curve?

They were on my car when I bought it.

Jerry

[t500hps]

I'm curious, what's the point of running long tube headers? Do they help to flatten/broaden the power curve?

I've heard long tubes are needed to "make the power numbers". I have no idea since A) That information came from Ford 5.0 owners and B) I bought my car with them and have no experience with anything else.


Is anyone running a 2V and "making the numbers" with shorties???? (If so, what's changed from stock to get there?)

[Sook]

I think Frederic has the 2V engine with shorties that makes the numbers and won a national championship.

- Josh

[fscott]

To be clear, the car won the national championship. I didn't. :)

The 2v 4.6 made 260hp, and ran manifolds. Aluminum block Romeo with PI heads and intake manifold. It was down to 250 when I got it, due to a bad roller rocker that flattened a cam lobe.

[t500hps]

To be clear, the car won the national championship. I didn't. :)

The 2v 4.6 made 260hp, and ran manifolds. Aluminum block Romeo with PI heads and intake manifold. It was down to 250 when I got it, due to a bad roller rocker that flattened a cam lobe.

But what is your torque? It seems the HP number is easy to make in a 4.6 but not TQ. When I got my 2V I was the only 4.6. Now there are several others and people are either 290TQ....or 310TQ and we can't figure out what is different (all are running longtubes).

[fscott]

But what is your torque? It seems the HP number is easy to make in a 4.6 but not TQ. When I got my 2V I was the only 4.6. Now there are several others and people are either 290TQ....or 310TQ and we can't figure out what is different (all are running longtubes).

Torque average of the three runs was 289

1973

[t500hps]

Thanks, I have the same issue with a iron block. I make 260 HP and my TQ is also around 290. I'm trying to find a way to increase it closer to 310.

[Supercharged111]

Thanks, I have the same issue with a iron block. I make 260 HP and my TQ is also around 290. I'm trying to find a way to increase it closer to 310.

Advance the cams?