If you've got a machine shop local or the tooling to do this with then have fun. I know people who have managed to complete this and have similiar results as those who bought a used kit for right around a $1000. These are only reasons that I personally have ran into for me not to want to try and fabricate and intake for the Supercoupe M90.

**** ATTENTION**** The mounting kit that comes from BBK for their supercharger doesn't include ANYTHING that makes it easier or even possible to mount the M90 on a 4.0. The install kit from BBK only comes with an air intake and necessary bolts to mount it, and even they are lacking some.

First the top of the blower isn't flat, its sloped downward. This makes it dang near impossible to fab a plate to adjust for the slope and to align the pulleys right for the blower belt.

Next, the Fill plug on a Supercoupe M90 is located on the front and also angled upward. Now if you want I guess you could fill it up and then install the blower, but if the front seal leaks, like they all start doing after about 5,000 miles on the old M90's, then you'll have to remove your blower to gain access to the fill plug.

Finally hood clearence. If you do manage to mount the M90 in a way that will work with the stock belt routing and it is top side up then your gonna have to play heavily with piping to get the discharge to the TB. I've found on the 3.0 I did that not even with a 2" Twin cowl hood would it fit with madrel bends, not regular bending would work but it would really put a squeeze on things.

The others you see mounted in various ways are not production chargers from Ford. Ford had the cases made to fit and work with their certain setup. The Jackson charger for honda's mounts sideways and is there fore cast to mount that way.

By the time you waste your money building and adapting stuff to make it work you could have bought a used one off of Ebay.

Oh, and one thing to warn you of, that dang M90 is heavy so make sure the truck your test fitting it on is low to the ground because your gonna lug it in and out of the engine bay numerous times.

Good Luck!!

Later Doug904.

*** These are all my own personal opinions so please if you have loads of money or run your own personal machine shop then have at it. I'm just trying to express my own expereinces with the M90 and the 4.0 while also dispelling any rumors that are floating around about it being similiar to the BBK kit.***

hi doug. thanks for all the good advice...thats the soul reason why I logged on and to find more info about the mod.Nothing worth while is ever easy ... and I know your right ....people who don't have welding ,fabricating or machining skill's or access to someone who has shouldn't even try this with out a note from there mother's (hee-hee)---- for me ----I'll try till I die----cause I have no life and no wife------good luck to all---------lloyd

I'm sure glad I didn't know how awful the m90 is, I might never have tried it!

if the front seal leaks, like they all start doing after about 5,000 miles on the old M90's

Just to be fair he did say old ones.


and just because:


The install kit from BBK only comes with an air intake and necessary bolts to mount it, and even they are lacking some.

In my case the intake kit didn't lack anything, the 3rd party supplied fmu came with the wrong fittings. Should they have checked it ? Probably. Did it make a difference to me, not much, took me longer to put the blower than it did to get the parts.

I'm sure vortech has sent out a few things incorrectly.

And if a vote happens when I'm not around I vote for closing this thread because this could easily lead into a bigger pissing match.

I think some people might be taking this the wrong way. A lot of ebay auctions are listing these supercoupe M90 units for sale for the 4.0 listing, "all you have to do is buy the BBK installation kit and it will bolt right up." I don't see anything slighting the BBK kit or the use of a M90 on the 4.0. Just that it's not nearly as easy as advertised on certain websites.

to put an eaton on a 4.0 is alot of work, i have a 87 b2 that i installed an eaton on and it would have fit under the hood if i didn't do a 2" body drop and take out 1 3/4" out of the front fenders to put on a 88 tempo front end. as far as the intake, i shortened it up so that the throttle body from the supercoupe is on the drivers side and the bypass is on the passenger side. the welding of the lower intake cost me 60.00. and since i already have all the tools to drop, chop and body drop this was actually easier than chopping the top 3". if i were to do it over i would either get the later m90,mp90, or one of the centrifugal blowers, since they are capable more boost

by the way, hope this helps other in not believing that it is a bolt on.

dang race, how many cars have you got? Throw up some pics!

This is all very true, nothing fits, you have to be a bit of a masochist to even consider putting one of the early m90's on a 4.0. The later blowers are better, though you can get a much better backplate for the early ones for about $500. The whole deal is that you can go out and find an early M90 for around $100 if you keep your eyes open, and you can make them work if you like fabricating your own stuff. If I was in the mood to spend $2000 on a bare blower, I'd be going for a screw compressor, not an eaton mp90.

So no pissing match, just that for some of us with the time and a lot of Scotch blood, the older M90 will give us a bit more power without spending a lot of money.

if you buy one for around 500.00 and can fabricate you will spend less than 20.00 in aluminum and maybe 200.00 to weld the aluminum ( at the most) and buy a different belt and idler pulley for about 20.00 you can easily have it all done for under 800.00.

i bought mine for 500.00 with the intercooler, tubing to and from,tb, intake and transfer tube to the intake manifold

i try and post some pic this weekend .... most people ask me what it is because they can't figure out what it is ..... with a tempo front end, top less, cad tail light and 6" fender flairs covering 12- 23.5 -15"s yes 12" wide

if you buy one of these blowers make sure you get as many acc that you can .... like tb, injectors,intake and exchange tube that goes to the lower intake, throttle cable and bracket for the throttle cable ... some of these items will make the swap easier

I gave $775 for my first Paxton setup off of a ranger classfied board. FMU/All brackets and battery relocation kit. I've been quoted well over $400 for a machine shop in my area to even think about making an intake for a M90 for a 3.0 but that was them doing everything from the measurements to the welding.

Later Doug904.

Seems to me the real point of all this is that unless you can do your own fabrication and figure out an answer to the fuel and timing problems yourself, you are far better off finding a kit and paying the price for having somebody else figure out the solutions.

If you enjoy fabrication, can control the fuel and timing, and can find an M90 cheap, they are a nice blower. I can't imagine anyone paying full price for a new or rebuilt one, when there are better, more efficient units available now. I got one free, and two more for $100 apiece. I spent about $50 for aluminum plate, welded it myself, then had a machinist friend surface the manifolds to make sure they were parallel to the crank for another $50. For me, this is the cheapest route to get some boost. Not the most efficient, but the most cost effective.

Since Dougs post is a sticky and staying at the top of this forum subject I wanted to address a few of his issues. His points are all valid so I wanted to find a way to get around them and still let guys like us with limited funds for our hobby put on a supercharger for less than $500.00 !!.

1. The blower isn't flat ... I use a vertical bolt in the stock front M90 mounting hole that allows you to easily set the alignment. You should not mount these upside down (in their normal setup the discharge is on top) because you will defeat the effect of the lubrication channels that are cast inside the nose housing.

2. Fill plug ... mounted the right way up the fill plug is OK so it is important NOT to mount the supercharger upside down.

3. Hood clearance ... The setup I'm using incorporates the stock T-Bird intake and S/C ouput so they stay nice and low. I am machining off the big nuts (now that has gotta hurt) that connected the pipes to the intercooler and replacing them with simple rubber collars and hose clamps. Gives an additional 1/2 - 3/4" of clearance. You can do it with a file.

4. The M90 is heavy ... (except the one Doug gave me that has nothing inside :) ).

5. Need a machine shop ... You do need to get parts welded, but with the setup I'm working on if you are good with a hacksaw, drill and file you can make the required parts then take them to you friendly custom muffler shop and ask the guy to weld them. Figure $10.00 if you smile or $20.00 if the guy doesn't like you.

6. Used kit for $1000 ... If you can get a used kit that is a bolt on for your truck for $1000 then that is probably the way to go and save yourself a lot of work. If you like the idea of saying you made it fit yourself or just want to do it, buy a box of bandaids and go for it.

7. I will give Doug or Adam the document I complete with my setup so anyone who really wants to give it a shot can see what I went through. Looks like about $450.00 if you don't spend more than $300.00 on a good T-Bird setup from eBay or a friend. I'm trying to keep the tough fabrication to a minimum.

one other point i would like to add is the reason it is not as efficient as the later models is the inlet is too restrictive .... to save money you can port it yourself and enlarge the opening by having some aluminum welded and porting it up to 1/2 larger ... adds boost, runs cooler and gives you about 20 or so hp

Right on Doug ... I have even talked to these guys ... http://www.zzperformance.com/zzp/products/prod_supercharger_port.htm# ... to get some idea of the improvement and it sounds really good. For $225.00 I'm going to send in one of the M90's I have and get it ported and polished, I may even spend the extra $175 and get the stage 2 porting. There are all kinds of these M90's pushing the power in Ford V6's over 300RWHP and going up to 400RWHp with engine mods.

7. I will give Doug or Adam the document I complete with my setup so anyone who really wants to give it a shot can see what I went through. Looks like about $450.00 if you don't spend more than $300.00 on a good T-Bird setup from eBay or a friend. I'm trying to keep the tough fabrication to a minimum.

Just wondering If You were going to post a link to this DOC on here, b/c I am going to try this setup here pretty soon. Thanks

I had a install kit made by a guy who sells on ebay, every thing turned out great, I do have a taller hood than stock and still needed to cut out the inside to fit M90, and I tapped for a fill plug on the new top side and plugged the original fill hole. I have 93 4.0 it is probly different for those of you with newer models.
I am damb proud to say my M90 is worth all the work that went into it, and would be glad to assist any one doing a simialer install, check my photos to see m90 install I did have all related parts powdercoated silver vein

With regard to the Supercoupe M90 used in an inverted application:

I purchased the M90 on Ebay for about $112.00, with no idea of what the mileage was. I've had it installed inverted on my 2002 4.0 Ranger for aprox 2 years. The mileage at the time of install was 92,000 and I currently have 156,000. So far I've had no problems, as this is my daily driver.

I've done no modifications to the M90. Have not seen any oil leakage on the M90. Will post later my findings when I replace it in the near future. I picked up another to rebuild as this one must be well over 100k miles by now.

Today is 02/02/2008 - I am still running same supercharger and vehicle now has 176,000 miles on it.