There is a company that is thinking of doing a intake for a 5.4 DOHC engine for a either Cobra or Lightning application.
http://www.sullivanperformance.com/rootsblower.htm
I have talked with the guy a couple of times with some ideas of my own. My idea is since the Lightning intake is a two piece design all he really needs to design is the lower part of the intake to match up to a set of DOHC heads. This should lower costs of the intake cause there would be less R&D and castings would not be as complex. Also with this design he could make an adaptor that would bolt on and allow 03/04 Cobra owners to use there style of blower and a 5.4 instead of the small 4.6. With 03 Cobra or aviator heads are not all that expensive and I have seen them new complete for the same price as Stage III ported SOHC heads. And the Cobra heads will outflow any SOHC head before porting. Since the next Lightning is curently on hold I think this could be the next big mod for alot of us who want the most performance out of our Lightning's. I know some venders have tried this with little success but I think this company has the best chance of making this intake a reality. They would like 30 people who can commit to this they are up to around 19. I know I am up for this. Just imagine a KB or whipple on top of a 5.4 DOHC engine

Mods please sticky this

 

I don't know how to post pictures over here so I will just give the link and you can look for yourself.
http://www.nloc.net/forum/showthread...threadid=86429

The first few pics are of a stock lightning intake on a 5.4L cammer motor.

There isn't much room to "reasonably" package an intercooler and still have the room or volume you need to flow a huge amount of air.
Dale

 

Looks to small for a 5.4DOHC.

I sapose you could use a Cobra intake. Cobra's are getting 800HP and up on little 4.6's

 

i don't know if it's a one of a kind, but there are at least one dohc 5.4 with a roots style blower and intercooler like the stock lightning out there.

I'll see if i can find the link i had. Basically what they did is make the intake runners taller to get it to fit and they had to use a rear inlet blower because of the difference in hight on the intake. It looked pretty trick. Maybe similar to what's in the new GT. This motor was in a mustang, not a lightning though, so i don't know what the demension difference is.

 

I heavily researched this project. If your really interested? Get with REM and we'll get started.

Rich

 

Th original prototype Ford GT seen at auto shows etc, had a regular 5.4 4V Navigator engine. There are a few of these one-off intakes around. A very few. (I heard 4). Thereafter the intake was made to fit the production GT heads, which are not the same as the regular 5.4 4V heads. So if you see any intakes around it might be one of those.

 

Fun idea, but which set of 4v modular heads will it fit? There are several to choose from. Early Cobra, late Cobra, navigator, Cobra-R, are all different.

 

All will fit but it's a matter of which intake mates up to them..I'd avoid the early Cobras and go with the later Cobra or Navi heads (Cobras may flow better but the Navi heads run water near the exhaust port which may help with a highly-boosted truck) and if you can find a set of Cobra R heads you've found the proverbial 'needle in the hay stack'.

 

Actually all the intake ports are drastically different. No way on intake will fit all.

 

I'm working on it........

Eric

 

On my setup I'm using the FR500 cylinder heads which have a port very similar in size to the 99 and up cobras and I'm using the navigator lower manifold as my base.

The cylinder heads are in the weld shop (brand new cylinder heads) having the intake flanges welded in 6 places on each head so that the navigator gasket will seal up. There is enough room to make the ports as big as I want but the gasket was hanging off the edge of the intake flange.....its a pain in the **** but what are you gonna do .
Dale

 

The design would be for newer Cobra heads. I can get 03/04 Cobra heads for $850 each complete. It would work for all DOHC heads but the Cobra R and the Ford GT heads. For the DOHC heads the intake port shape can can vary but in the Cobra R and Ford GT heads the intake ports are taller and the heads are very expensive.
I would like to see some dealers thoughts on the issue. I know both REM and JDM have thrown the idea around some. Stage III ported DOHC heads will flow another 100cfm over stage III SOHC heads. Throw some cams on that and wow you could make some power. Torque should not drop off any because of the long stroke the 5.4 has.
I think this could be the next big MOD for some of us who have pretty much have nothing left to do to our Lightnings.

 

one thing to remember is once the 4 valve heads are bolted up the width of the intake has to be narrower than the 2 valve intake. it only takes time and money.

 

Robert
Thats the point I was trying to make.....why would somebody want to put cylinder heads on there motor that are capable of flowing 25/30% more air and then kill it with a manifold that doesn't have a prayer of feeding them. Trying to package an intercooler in that narrow space and then giving the engine room to breathe...well I'll just go out on a limb here and say it can't be done. If your going to run 4V heads then you should plan on enough airflow to make a 800 horse....other wise....why bother.

There has also been a bit of a rush lately to the turbocharger and that includes me, but I wonder if a lot of that didn't come about because of some rescent articles in MM&FF.

I just want to say that the MM&FF articles are very very flawed in there thinking and execution. Their article on runner length is border line stupid. The only thing they prooved with that little test was just how restricted a stock '03 manifold is, they didn't prove anything about runner length as a matter of fact there findings turned out to be exactly backwards....Tards.
And as far as turbocharging being 200+ hp better than the belt drive chargers...NOT. Again they changed manifolds for the test and that further proves the restriction in the '03 manifold.

Okay...rant over
Dale

 

I read that MM&FF article 3 times regarding runner length... I started to question my reading ability. Glad it just wasn't me!

Everyone is hung up on the intake. Although a big part of the conversion it's only half the battle. Front drive for S/C and accessories is also a "custom" affair.
This isn't for the faint o'wallet.
Not yet atleast.

Eric