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Projects Twin Eaton M90 351?

Discussion in 'The Hokey Ass Message Board' started by Menchacha, Jul 31, 2021.

  1. Menchacha
    Joined: Apr 19, 2021
    Posts: 16

    Menchacha

    Need some opinions on an idea I had, saw some guy twin supercharge a big block Chevy with two Eaton m90s off some junkyard pontiac grand prix’s, thinking about doing it to a 351 windsor. Think it would actually make power or just look super flashy? I’m a broke high school student so it’s about as much as I can realistically afford. I’ve made intake manifolds before so it shouldn’t be that hard, but I still don’t know if it’s a great idea. Any opinions?
     
    alanp561 likes this.
  2. gnichols
    Joined: Mar 6, 2008
    Posts: 11,019

    gnichols
    Member
    from Tampa, FL

    If you want an engine with a blower, find a source motor (donor car, crate engine from a name mfg. etc.) complete with wiring and ECU. Otherwise, you're never going to get it right.
     
  3. Really? How was that done BEFORE ECU?

    Ben
     
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  4. Twin blowers been around for a LONG time... Efficient NO.. Kool factor YES !

    4e45f7e019c60139c04027ffd19f4ba3.jpg

    There NO stinking ECU"s here.


    And yes a custom intake would have to be made.
     
    alanp561 likes this.

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 49,828

    squirrel
    Member

    It wasn't a good idea to use two blowers on a BBC, it's probably not a good idea to use two blowers on a Ford engine. A single blower, the right size, works great.

    If you want to put two blowers on just because it looks wild (which is likely why the other guy did it), that's another story. Go for it!
     
  6. If that's the case, I'm sure there are better cost/benefit ways you can spend your money...and effort.
     
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  7. woodscaper
    Joined: Feb 20, 2011
    Posts: 67

    woodscaper
    Member

    If you can get the blowers for little or nothing and have the ability to fab up the intake, GO FOR IT! No better way to learn new stuff and see what works!!!
     
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  8. cornfield county
    Joined: Feb 10, 2007
    Posts: 147

    cornfield county
    Member
    from Indiana

    I read up on M90's once. Not worth the effort for the displacement of that little blower.
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 49,828

    squirrel
    Member

    if they came off of 231 engines, and you put two of them on a 351 engine, you should make a bit more boost than it did in it's original application.
     
  10. From your post,,,,,,I think it would be more flashy than make good power.
    It can be done,,,,,but not on the cheap ,,,,, maybe use one and try that .
    Two just requires a lot more layout and plumbing,,,,,and really doesn’t return much for the effort and money spent .
    I see you have a 46 Ford truck,,,,,it would go nicely in there,,,,and fit under the hood I think .

    Tommy
     
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  11. Menchacha
    Joined: Apr 19, 2021
    Posts: 16

    Menchacha

    yeah only issue with using one is it would act more like a fancy restrictor plate since it was made for a 3.8L
     
  12. Menchacha
    Joined: Apr 19, 2021
    Posts: 16

    Menchacha

    Yeah that’s why I’m thinking two instead of one. Cause if one is just enough for a 3.8L, two should be more than enough for a 5.8
     
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  13. Menchacha
    Joined: Apr 19, 2021
    Posts: 16

    Menchacha

    I was thinking about that but I got enough spare parts lying around I wouldn’t have to spend much more than $200
     
  14. moparboy440
    Joined: Sep 30, 2011
    Posts: 715

    moparboy440
    Member
    from Finland

    If you've got access to a lathe, a mill and TIG it can be done.
    But two blowers are gonna create a LOT of heat. You're gonna need a good cooling system and good fuel to prevent it from a nuclear meltdown.
    The pulley system will also take alot of effort to get right.
    sbc twin blowers.png
    [​IMG]
    [​IMG]
    [​IMG]
     
  15. Bert Kollar
    Joined: Jan 10, 2007
    Posts: 1,064

    Bert Kollar
    Member

    Go for it. When i was building high performance VW engines I wanted to blow one but couldnt find one small enough for the money.W ish I had them back then
     
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  16. squirrel
    Joined: Sep 23, 2004
    Posts: 49,828

    squirrel
    Member

  17. Menchacha
    Joined: Apr 19, 2021
    Posts: 16

    Menchacha

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  18. Wrench97
    Joined: Jan 29, 2020
    Posts: 476

    Wrench97

    Take a look at the Ford set up on the 3.8l 89-95 tbird super coupe, if you use fuel injection and a tuner package pushing air only in will make the plumbing and fit up will be a lot easier you could even add a CAC package to cool it.
     
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  19. Menchacha
    Joined: Apr 19, 2021
    Posts: 16

    Menchacha

    I’ll take a look into it, was thinking of welding a flange to the back and fitting a carb mount at a 90 degree angle to the back of it
     
  20. Menchacha
    Joined: Apr 19, 2021
    Posts: 16

    Menchacha

    Who needs efficiency, as long as it makes at least 5 pounds of boost I’d deem it a screaming success XD
     
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  21. Do you have the super chargers etc ?

    trade them or sell them and buy a centrifugal charger for a v8 and be done.


    Lots of em for sale for MU$$$$S for not a lot of money used
     
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  22. Do it! I spent a lot of money to put dual four barrels on a car and it make no more power then it did before but it sure looks cool!!
     
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  23. tjm73
    Joined: Feb 17, 2006
    Posts: 3,402

    tjm73
    Member

    Menchacha, alanp561 and squirrel like this.
  24. FrozenMerc
    Joined: Sep 4, 2009
    Posts: 2,760

    FrozenMerc
    Member

    I can't believe some of you grumpy old farts. He is a broke high school student who wants to get his hands dirty and fuck some shit up! We should not only be encouraging this, but providing support and sage advice. This kid is a god-damn unicorn these days. Try getting any one of his peers to look up from their phone screens for more than 10 seconds once. Hopefully this sort of tomfoolery and shenanigans will lead to a career in a highly technical field such as engineering or machining, much better than another communications major becoming a "community organizer" and spending his life asking - Do you want fries with that?
     
  25. mohr hp
    Joined: Nov 18, 2009
    Posts: 364

    mohr hp
    Member
    from Georgia

    It might work better than expected on a 351; those Eaton blowers, While tiny, are screw blowers, with very good adiabatic efficiency. Won't generate a lot of heat like 2 roots type, and the sizing of 2 in parallel should feed that engine well. It will take some real fabrication skills.
     
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  26. Tman
    Joined: Mar 2, 2001
    Posts: 34,935

    Tman
    ALLIANCE MEMBER

    This whole discussion is wayyy OT
     
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  27. OT,,,,,I’m not really sure about that .
    Superchargers have been around for a long time,,,,,even twin superchargers .

    Now,,,,about the sage advice from a few posts back .
    Twin superchargers will be a lot of plumbing and added headache for a 17 yo broke high school student.
    There is nothing wrong with trying,,,,,but be prepared for the added cash outlay,,and the potential results.
    You have to learn to crawl,,,then walk,,then run .
    Like Clint said,,,,”a man has got to know his limitations.”
    I’m sure he can do it,,,,,but at what cost,,,that’s the question ?

    Tommy
     
    X38 likes this.
  28. BadgeZ28
    Joined: Oct 28, 2009
    Posts: 1,112

    BadgeZ28
    Member
    from Oregon

    I saw a budget build using two at a OT 4th gen F-body forum. Have you tried doing searches on the subject?
     
  29. gnichols
    Joined: Mar 6, 2008
    Posts: 11,019

    gnichols
    Member
    from Tampa, FL

    Further... here are some pix of my avatar 27 pickup truck. Single Eaton power'd 3.8L V6 (that's 230 cubes just like a flathead) from a donor Pontiac Grand Prix. Not pretty, hot rod motor wise, but it started on the first hit. Essentially stock motor, modified ECU to bypass some of the security issues by a pro. Wired stock. It was hard to fit under a T / A hood but a creative intake and hood scoop got it done. Makes about 210 lb ft a the rear wheels, 13.96 is my best in the quarter, just shy of 100. Gets 20 mpg at 80 mph on the interstate no problems. I have considered a simple pulley change for more boost. Essentially a take out / drop in. Uses a Camaro V-6 4spd auto. I suppose I could have done 2 blowers like you are planning, chromed everything and hid a lot of the wires to make a show motor. My point still is, I didn't have to do any math or new engineering to get it working. If I wanted an old school blown V8, with multiple blowers, I'd have went to some place like Edelbrock or a pro engine builder and got a dyno tuned motor, all ready out of the box.

    ATTACH=full]5133112[/ATTACH] View attachment 5133113 View attachment 5133114 View attachment 5133115 View attachment 5133116
    View attachment 5133112 View attachment 5133112 View attachment 5133113
     
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  30. metalshapes
    Joined: Nov 18, 2002
    Posts: 10,716

    metalshapes
    Tech Editor

    ECU? What kind of carb is that?

    I've never heard of it...
     

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