Inliners International Forums General Discussion Blown and Injected M90 superchargers

An earlier post got me thinking about the M90's. Seems to me they would be a good fit to many of the old inlines. Plus, they are plentiful at the junkyards.

A co-worker recently picked up two of them for $50 a piece and the U-pull yard. Not a bad price for used horsepower.

I know the turbo seems to be the rage right now. Why not the M90 Blower? I opened the hood on my Trailblazer, there may just be enough room on the drivers side of the engine for such a swap.

Any ideas?

I think its a good practical idea, many people don't like the turbo route because of the extra exhaust mods required. A supercharger is cheap and affordable, plus easier to install and yields the same results. Boost is boost, whether it comes from a pulley or exhaust driven.

There will be a lot of discussion on this. A lot of turbo guys think they are getting free HP and say belt drives suck HP at the crank. The old McCulloch on my kids Studebaker will make you smile and start looking for the brakes.

Please `splain, what`s a m90?

Eaton m90 super charger.

M90's are an Eaton built belt drive supercharger. GM used them on the 3800 Pontiacs and Buicks. Ford used them on the Mustang and Tbirds. Seems to be a good size for 6 cylinder engines. It may be a little small for a Vortec 4200 though. Some port work and pulleys should help that out though.

That all being said, they seem to be plentiful and there is a pretty good aftermarket for them, so finding parts and rebuild kits isn't that hard.

Check out this one on a Jeep.

http://naxja.org/forum/showthread.php?t=1046470

The Eaton M112 supercharger seems to be a little bigger and suited for the 4.6L Mustang engines and might be a better choice for the
4.2L Vortech engines.

I looked at the M112's, but they are huge compared to the M90's. I like how they have a built in intercooler that sits down in the V of the engine, but I can't see how it would work very will on an inline engine. The intake manifold would be enormous sitting off to the side. It may be possible to use a M112 without the intercooler, which would save alot of space. Not for sure how much heat they generate though. Sitting off to the side, and not on top of a V engine, it would surely run cooler.

I guess someone has already thought of it. Here's a M112 in a Trailblazer http://forums.trailvoy.com/showthread.php?t=68142&page=12

Well, I'm having a senior moment right now, but someone on this forum has one on a 250 in a blue roadster...Sorry, can't come up with a name...anybody else?

Paul

Ah HA!...A synapse finally fired... it was jlgrooms who put the M90 from a GM 3800 on a 250 mere on this forum. Search and you'll find it.

Paul

I found that thread but either the pictures are no longer posted where they were or they aren't popping up for me anyone have a picture of the set up he is running?

hendi:

Try sending jlgrooms (Pappy) a PM and see if you can get the pics that way. He may have them posted on another hosting service.

Paul

Here's one in a Holden 179. Looks like a Pontiac FWD version.

http://www.youtube.com/watch?v=mPCTxj5R5DE

Here's a blown 235. Kinda cool

http://www.youtube.com/watch?v=FuLl1QIzi2k

Note the single SU on the Holden, too small but will work.
The GMC is a mistake, it probably takes 30 hp to spin it.