http://forums.modulardepot.com/showthread.php?t=96044

Looks like the swirl dams are a good thing in NA 4.6's. Guess I need to cancel the removal if it's not too late.

Just called Patriot and they said they always remove them, NA or boosted. Hmmmmm...

 

Those are the ladder cam girdles in the Romeo heads.

 

They have the exact same illustration under the Windsor 5.4L - Identical. Well that sucks - I have one more I can try..

 

This DVD has it right - is this what you have on yours. I have the pics that shows the different sequences at each stage. I'll upload them if you need them.



NOTE: Make sure to tighten the bolts in sequence in three stages.

Tighten the LH bolts in the sequence shown.
Stage 1: Tighten to 40 Nm (30 lb-ft).
Stage 2: Tighten an additional 90 degrees.
Stage 3: Tighten an additional 90 degrees.

RH cylinder head


NOTE: Make sure to tighten the bolts in the following three stages.

Tighten the RH bolts in the sequence shown.
Stage 1: Tighten to 40 Nm (30 lb-ft).
Stage 2: Tighten an additional 90 degrees.
Stage 3: Tighten an additional 90 degrees.

All cylinder heads

 

Yup, same thing. I don't need them, but appreciate your help as always.

Got the swirl damn removal cancelled. If anything, I can knock the top edge down by hand if I decide it's worth the risk of gashing a freshly surfaced head.

 

Read what Cobra Killer has to say on page 2.

Regards

Jean Marc Chartier

 

Since I don't have ported heads, cams, or a power adder...I feel more comfortable leaving the swirl dams alone.

 

90 degrees = 1/4 turn .. I would just judge that myself. You could just mark Deep well if you wanted or even mark the bolts themselves to tweak them .25 x 2.

 

More info on the swirl dams:

http://www.modularrevolution.com/for...ead.php?t=1272

 

Very interesting, great find

 

I wonder if Fox lake and Patriot will modify their design?

Regards

Jean Marc Chartier

 

I just did some checking. nickmckinney's Numbers are;
0.1 51.7/41
0.2 94.7/80.2
0.3 136.3/115.7
0.4 168/145.9
0.5 188.4/160.7
0.55 197.5/164.3
0.6 204.7/165.3

FOX LAKE claims 200/182 @0.55 for Stage 1 and 223/195 @0.55 for their stage 2. So I think Fox Lake has better flow. Now I can no longer be sure if Fox Lake takes off the Swirl Dam.

Regards

Jean Marc Chartier

 

Now I just checked Patriot and they Flow 217/189 @0.55 with their Stage II and
227/196 @0.55 for their Stage III. BTW their Combustion Chamber is 46cc.

Regards

Jean Marc Chartier

 

Good info JMC. I don't know much...obviously learning, but from what I gather, high cfm's don't always equal more low - mid range torque...??? Isn't it more about velocity and atomization? Do the swirl dams have that much of an effect on cfm's?

Got a header update and pics coming up in my OBX exhaust thread.

 

From what I can gather in the 3 pages of info nickmckinney claims to have gained more flow than two well known head porters. He also stated that the flow numbers that the others have used were obtained without using the intake manifold. He also stated that he was unable to use the intake manifold when he tested because of a fitting problem. So from that I deduce that he used the same method as Fox Lake and Patriot.

You have nothing to loose by leaving the Swirl Dam in place. It is much easier/cheaper to remove it later than replace the entire head.

You also have to realize that these guys are discussing the 4.6. The extra stroke of the 5.4 dramatically changes the flow requirements of the heads. Try this. Get two syringes of different lengths. Pull the short one so it sucks up some water out of a cup. Then take the longer one and do the same. You will notice that the longer one is harder to pull and you pull it slower even though you are pulling with the same force. Now realize this. At 5500 rpm the longer syringe is pulling at a faster speed because it has a longer distance to travel. Can you imagine how much faster the water has to flow? Or in the case of an engine the air flow?

Regards

Jean Marc Chartier