Cam swap

[Big House]

Ok, I know there are alot of experts that can chime in on this one. What kind of work would need to be done to swap in Navi or Expedition cams to get get more low end torque? Also with those cams, if it could be done, would you lose the top end? I read some where that Navi cams are put in a set of heads and resulted in a good low end pick up. Let me know.

[94_302]

If your goal is n/a I would suggest looking here (http://www.mach1registry.org/forums/forumdisplay.php?f=64). I don't think too many folks do those kind of mods to an n/a car over here. The Mach does have the same motor (the autos) and I think you will find more info about going the n/a route with a 4.6 DOHC.

[Blackened300a]

Our Member POWER SURGE should chime in on this, He had a 03 Mach 1 in his shop that was having bigger cams installed, The end result was very disappointing on the dyno.

[Joe Walsh]

William, I chose to swap out my cams as part of a complete engine rebuild.

I think that just a cam swap is a waste of money....you would get more bang for your buck with exhaust, gears, tune, etc.

Having said that, I'm glad that I swapped my cams in my engine when I rebuilt it.
I was very concerned about losing low end torque on our already cubic inch challenged V8s.
I chose to go with a set (of FOUR!:eek: ) Crower 'BAJA BEAST' cams. P/N 62925-4.
These cams are specifically designed for heavier vehicles that need to retain low end torque.
They are NOT good MACH I Mustang cams.
They have a little more duration and good bit more lift than the OEM Marauder cams.
They do NOT require new cam springs. (I chose to upgrade my springs because I also opted for +1mm larger S.S. valves).

I can't give you a HP increase vs. OEM because the engine rebuild added 24 cubic inches and a bunch of other mods.
She's putting out 340 ft/lbs RWTRQ. It was dynoed with only 200 miles on the new engine, so I know I've got more than 340 now.
Joe

[crouse]

Check out the Sean Hyland web site.

http://www.seanhylandmotorsport.com/

[Lidio]

Ok, I know there are alot of experts that can chime in on this one. What kind of work would need to be done to swap in Navi or Expedition cams to get get more low end torque? Also with those cams, if it could be done, would you lose the top end? I read some where that Navi cams are put in a set of heads and resulted in a good low end pick up. Let me know.


Don't put to much effort into a cam swap in a 32V 4.6L. Its starting to just now surface in the 32V community that for the most part they're a very expensive upgrade that's only worth about 15-20 HP and in some cases worse. Along with drive-ability problems and loss in low end TQ (especially with the large aftermarket ones). Also most 32V cams are the same from Ford. I'm no totally up on this but I've heard that the exhaust cam on all 32V's is about the same as the one that started it all in the 1993 32V Mark-8. And that only the intake cams have seen some minor variations in the last few years like in the Mach-1 and the MM's. Even in the larger 5.4L in the Navi.... I've heard those cams aren't much or any different then the 4.6L 32V's.

I know for a fact that the 03-04 supercharged Cobra's use the same cams that are in the MM and Mach-1... and yet the Cobra has low compression and a blower, but Ford still used the same cams as the 10.1:1 compression Marauder NA motor. That shows you that for the most part the engineering they've done works all around I always say. At my facility the number one reason we've started to do a few cams in both 2V and 32V applications is quite simply to get that rumpity cam sound at an idle. But those cams with a price on some cars, especially automatic cars and "in drive" idle problems some times.

I'd look into other upgrades like other members have suggested long before you consider a cam swap.

Thanks.

[94_302]

I think that in order to take advantage of the cams you need to do something about the heads, as well as long tubes. But you have a set of Stainless Works already if I remember. Two users have done cams Master and natedog1284. They might be able to help you with your choice. From what I have read on the Mach boards some have attained 400 to the wheels with heads, cams, intake, exhaust and other bolt ons. I would also suggest the forums at modulardepot.com but I think they are currently down.

[SergntMac]

Maybe this will help? Stock Marauder cam part numbers...

Intake:
Driver's side = YL7Z-6250-DA
Pass. side = YF3Z-6250-AA

Exhaust:
Driver's side = YL7Z-6250-BA
Pass. side = YL7Z-6250-AA

Maybe someone can cross check these part numbers to see where else Ford used them?

[Big House]

Oh no this is not a consideration...just asking because I read somewhere someone was using Navi cams for torque production. In looking at the price of 4 cams...I wouldn't be to far off a S/C.

[SergntMac]

I'm going over a set of stock Marauder heads now, heads with 100K miles on them. The cams and valves look okay, but show some wear and tear, I'll prolly use the FR500 cam/valve kit from Ford racing to get all the matching parts together in one box.

My wrench says it's going to be a tad more difficult than just dropping things into place. To be done right, the heads will have to be remachined and line-bored to clean up the effects of the tall mileage. The cam girdles are all worn to a "form fit" to the old cams, likewise valves, followers and lash adjusters. But, it should be worth it. Still cheaper than buying loaded replacement heads, and I get some custom port work to boot.