T-Bucket 4.6L DOHC modular motor swap update (sorry, but I kind of wrote a book) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-31-2006, 07:55 PM
Arrowhead's Avatar
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T-Bucket 4.6L DOHC modular motor swap update (sorry, but I kind of wrote a book)

Still have a few bugs to work out and some detailing to do, but I have about 100 miles on it now. I've posted my progress over the last 6 months from time to time and hope I'm not being premature about it running good, but so far it is.

To recap the swap, I had a 302 EFI engine and I swapped in a 4.6 liter, DOHC, 32 valve, all aluminum engine from a 1993 Lincoln Mark VIII along with the 4R70W electronic shift transmission. This engine is similar to the engine used in the Mustang Cobras, but not as stout. It's rated for 280 HP in stock form. I added to that a 6-71 blower on a modified 96-98 cobra intake manifold. The blower case and rotors were given to me by a friend and I bought a drive setup and rebuild kit for it and put it together. I used an aftermarket balancer so I could bolt the blower pulley on. I was concerned about the intake air temperature getting too hot without carbs on top of the blower, but we've had some 85-90 degree weather lately and I've been running it at sustained highway speeds with no problems yet. Almost EVERYONE said it wouldn't work, but I didn't build this for drag racing, just cruising.

Fuel Injection:
I used the stock injector locations on the intake manifold and 24# injectors. I used aftermarket fuel rails and regulator and made up my own fuel lines. The bugcatcher operates as the throttle body. Since three butterflies would flow way too much air for a 4.6L motor, the two outside butterflies are blanked off. The computer I used was a "do-it-yourself" Megasquirt that I bought as a kit and soldered the components together. It operates as a speed density system so no mass air meter is required. There are minimal sensors required and the system is super slick. I did go with a wide band O2 sensor to make sure I have good A/F ratios under all conditions. All the operating conditions are programable by laptop. Even the O2 sensor settings are programable.

The stock ignition is a distributorless wasted spark setup with a crank trigger wheel inside the timing chain cover. The timing is also controlled by the Megasquirt. The entire timing curve is programble though the laptop.

This actually caused a lot of problems. With the Megasquirt running the motor, I tried to use the stock Mark VIII computer to run just the transmission. This didn't work very good and I damaged the transmission. I had a spare so I swapped it out and bought a Baumann aftermarket transmission controller. That is also programmed by the laptop. It works very well, but I still need to tweek some of the shift points.

My goal was to have something different, but I also wanted relability and good gas mileage actually, I do drive the car a lot. So I have taken steps to actually "de-tune" the motor a little so I don't get my self in trouble. So far it's getting over 20 MPG and I think 25 is possible.

Most of this is covered in my journal, but I thought I put it out there comments and complaints. Hope you like
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Old 05-31-2006, 09:25 PM
ChevelleSS_LS6's Avatar
Jeep XJ and a Javelin
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That, is awesome! I love the valve cover covers? Whatever you call them, I like how they provide the engine with character... Geez I hate LS1s horrid ugly coil-on-valvecover hiding under stupid plastic cover setup.

Back on task, that's a very different route you chose, and I think it's really great- kinda like if anyone swapped one of those Vortec inline sixes into a pre-55 Chevrolet in place of the stovebolt.

Or in your application, where a flathead would stereotypically traditionally reside, a modern 4.6 now calls home.
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Old 05-31-2006, 09:39 PM
Classix_Lover's Avatar
Music soothes the soul

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Wow that's looking great! I've been following your project for some time and that is looking really killer! I loved how you custom fabbed up your own radiator hose system. That came out pretty damn well and it won't contact that massive blower belt either You definately are the definition of "hot rodding" by being unique with that car and also proving to all those people that said, "That'll never work.." that it infact did and does work so have fun saying HAHA to them and geez 20 mpg?! Lucky!
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