Eaton M90 supercharger questions....

[hasa68mustang]

ok Well I was fixed on a turbo for awhile then was not too sure then REALLY wanted a turbo then ran out of funds, then got funds and bought a header to help gas mileage (brought it up from under 11 to 15! and then I kinda decided on NA, and was looking on ebay for superchargers and remembered about the M90 being a good choice... Well I was wondering where some stuff went and some other basic questions... oh and I wanted to do a blow through setup...

ok first off some pictures... :

My original post I was making I was completely confused by the fact that the supercoupes were factory intercooled so I had no clue what all the extra holes were from... ok so this pic makes it much less complicated... I would just mount the supercharger upside down and make some kind of carb hat and a hose kinda thing over to it, then where the EFI piece (the word isnt coming to me oooohhh ya throttle body... duh) goes you just mount an airfilter to that section correct? do they come with wastegates stock? kinda looks like one in that pic.... heres another:

That could also be controlled by something like linc200 made correct? and they also have a recirculating BOV deal inside I believe I read also? Sorry about all the questions... I wasnt wanting to run 800 pounds of boost I would be happy with a conservative 8.... just a littel extra oomph...

Thanks, Tommy

 

[Anonymous]

Sorry, Tommy, you are not going to be able to control boost with a ball valve apparatus on a supercharger. You can only control it with pulleys. The Bypass Valve in the blower is to reduce drag while not under boost.

 

[hasa68mustang]

Thats what I read, thanks for clarifying that! Tommy

 

[66Sprint6]

I wanted to go M90 for the longest time, alot of my early posts were M90 related...Dan (inportkiller) prolly remembers that, but then he went turbo and I saw/read into how much more efficient the turbo is and went that route instead. Somedays I wish I had anoth inline to supercharge so I could have a little power, that supercharger whine and the wicked exhaust note I had before I ditched the headers. Would be kinda kool to see an M90 on a six
Matt

 

[Anonymous]

The eaton blowers are designed to work as draw-thru. The throttle bodies must be ahead of the blower. You can not run raw gasoline thru an eaton. The rear rotor bearings are not sealed and the gas will wash the grease out and it is claimed that the teflon coating will come off the rotors. Other then that, there is nothing wrong with the eaton blowers. If you respect their limitations they will realible give you 10lbs of boost all day long.

 

[hasa68mustang]

I was wanting to do something like this but run it as a blow through setup. I would leave my carb where it is and hook up an intake to the back port area where he has the carb hooked up. would that be ok? there are also oil lines that would have to be hooked also right?

 

[Anonymous]

Interesting setup. I wonder how the bearings are doing.

A roots style of supercharger can not be used in a blow-thru setup. Unlike a certifigual supercharger, the compression is done externally by pumping more air then the engine can use. This compression usually happens in the intake manifold. This causes a little bit of backflow into the supercharger from the manifold. This is also why the roots supercharger is not as effecient as the certifigual superchargers.

If you place a valve in the middle of this setup, it becomes very inefficent. There is no place to compress the air. The air backflows into the supercharger and gets heated again. If the cutoff is severe enough it could cause damage to the supercharger and/or drive belt.

If you do a web search, you will find that nobody runs them in this fashion, and those that tried, converted over to draw-thru.

 

[robbinsj]

The M-90 setup is something I'd like to explore. If I use one on my 250 engine, with dual Clifford headers & dual exhuast (in place) and a Clifford 264 cam or equivalent (not in place yet), will my Weber 38 carb be sufficient?
-Joey

 

[FrankBoss]

the rear bearing in a eaton is not sealed but you can buy aftermarket sealed bearing to fix this problem.

I have seen little Euro cars using EFI eatons....I also thought about using on in a 2.3l four but it lost out to the lack of tools to do the fab work...I'm getting there,

Frank