Does anyone make a gen 1 small block adapter plate for an Eaton M90 Supercharger? I may have a line on a cheap ported unit that a friend has decided not to use and I'm wondering if there is a reasonably cheap way to put it on top of my motor and retain my TPI FI computer.

 

Buy an '82-'84 Crossfire intake. You can usually find 'em for ABOUT $50 bux, with a little looking around.

Make a lid out of aluminum, using the stock lid as a template, BUT, with the hole and bolt pattern for the Eaton, instead of the Tb's. Drill the lid for the TPI injectors/fuel rails and use them.

Port the runners heavily for more upper/mid tq....or cut 'em out entirely.

You could probably do the whole affair for less than $200 bucks.

 

IMO an M90 is way too small for a v8. If you look back about 15 years, I believe "Saturn" or "Saturn5" had done a twin m90 on a 305..

Even a 112 I think is too small. I'd be looking at a MP122 at minimum.

-- Joe

 

I totally agree......D. Totally. U-pull-it yards around here have 'em by the boat loads for dirt...and I've thought about going that direction on the Kart...both for power and visual effect. But....I always come around to the same conclusion; "Way too small for a 350". Probably wouldn't make more than 2-3 lbs of boost. Waste.



Then I saw this:

 

I've watched that video. I wish he did a dyno of the modified 4.8 before the blower. I'm guessing the blower maybe added 100hp. I guess 537 peak is not terrible for a blown 4.8.

-- Joe

 

It's not terrible. Not nearly as terrible as I thought it would be. I watched it for yuk-yuks....and to see HOW he got "537hp" from an M90!?
Turns out he did it in a straight forward way; bolted it on there. What I really couldn't believe was that the thing made 9.5 lbs of boost, and the IAT weren't off the charts either. Even if id did add "only 100hp"...that's 100 hp for ~$100bux and some DIY labor? That could be worth it....it's a lot better "deal" than the Super Ram was on the Kart, @ what, $2000? For 50 hp?

Believe me....I'm no proponent of the M90 on a V8....but for "No-money mods"....I have to admit that this vid changed my perception of what the M90 CAN do.

 

I dig the idea, a junkyard L33 or LC9 with a junkyard blower making 500hp sounds like a cool street car.

Though, I think in practice making the m90 with an adapter fit under the hood of most vehicles might be quite difficult.

Here is a M122 on an LS with a mock up of what could be an adapter:



I'd probably use something like this holley base, and make a "lid" tha tbolts to the blower:



But I suspect it would still be absurdly tall.

 

Not the 4.8, but he just did the same on a 5.3....looks like he gained maybe 50 hp w/the blower?



....at that level. I agree with your earlier 100hp assessment; on the smaller, less efficient combo, it could have added 100hp. I wonder how that intake would do on a stockish L98, spinning to make ~10lbs? On the one hand, you could spin it a lot slower to get the same boost...OTOH, heads/cam/exhaust would limit the gains. Now I'm wondering if I should try it?

 

Looks like 59 horse, 100 or so torque, but on an already modified motor. I'd be interested in seeing what it did on top of something as bone stock as possible. Would still need the lower high ram manifold, and a tune, but I think that's a more likely scenario for most people who would bolt one of these on. If someone's already bought heads and a cam and everything else he's done, I think it's unlikely they'll be putting a junkyard m90 on top.

 

Agree.

This supercharger is a "most hp for 'no' money" effort, IMO. It would be for me. So I agree with you. It's got me thinking about trying it, though....

I wonder what Tear-A-Part and Pick -n-Pull ask for these?....

 

I'm curious what it could do on top of a little 2.8, really. I don't know if it would be worth the trouble tuning it, but I might try it once I pull mine out.

 

I wouldn't mind giving it a shot once I can pull the car from daily duty.

 

So just putting this out there (again). The m90 is cool, but you can buy a 112 or 122 for under $800 all day on market place, ebay, etc. I think if you are going to go through the effort on a SBC, LS, LT1, whatever - go with the bigger blower. I realize M90's are almost free, but it's all the other work that is going to cost and most of that won't be usable if you decide later you need a 112 or 122.

-- Joe