First ride making boost!

Discussion in 'High Tech for Old Iron' started by jon2295, Oct 28, 2014.

  1. jon2295

    jon2295 Well-Known Member

    Wow , only about 4lbs of boost and it feels like a different car. This is a very low budget build, didn't want to post anything about it until I got it to work.
    1971 skylark 350 (over100k) swapped in 4 barrel intake, demon 650 blow thru, powerdyne bd 11, boost referenced the mechanical fuel pump, carb hat from pep boys, hose from ace hardware.
    The powerdyne was 300 bucks. It was from a mustang. Tried using the bottom pulley but wasn't working out right. Now try not to laugh, I bolted a v belt pulley to the powerdyne and mounted it where the ac had been mounted. The original length ac belt fit perfect with my homemade tensioner. The demon was a craigslist find for 250.
    When I took it out tonight I didn't have my air/fuel gauge working, need a new harness, so I didn't go too crazy with it but was amazed that it actually worked. Had been getting no boost then added another spring to my belt tensioner and that made the difference. Kept spinning the hell out of that one tire, 275/40/r17 , believe it has the 2.56 rear, now I need a posi. Even the roll on from 40 felt strong. Yeah I think I'm hooked on boost.
     
    Skippy597 and Nailhead Ronnie like this.
  2. Buick#455

    Buick#455 Well-Known Member

    Awsome... When you get a chance post some pic's of your set up. :TU:
     
  3. jon2295

    jon2295 Well-Known Member

    I will get some pics up soon but it ain't pretty.
     
  4. sailbrd

    sailbrd Well-Known Member

    I think you will get the prize for least amount of money spent on a supercharged Buick. :laugh: And you got a v-belt to spin a blower! Can't wait to see the pictures.
     
  5. AZ-69 Skylark

    AZ-69 Skylark Well-Known Member

  6. sriley531

    sriley531 Big green hunk of $#*^....

    Man, talk about BUDGET boost!! Very cool. Post up some pics when you can, I'd like to see it. Sometimes creativity trumps "being pretty".
     
  7. Buick#455

    Buick#455 Well-Known Member

    FYI, In his post it states he running a BG 650 blow thur carb
     
  8. AZ-69 Skylark

    AZ-69 Skylark Well-Known Member

    :error: I saw he was using a Demon, but missed where he's using one set up for boost already. $250 is a score considering you are looking at $700-$1200 for a new carb set up for blow thru.

    Major points to the OP for ingenuity and low cost.
     
  9. jon2295

    jon2295 Well-Known Member

    Ok, took a couple pics today. Try not to beat me up too bad. Bottom line it works. I'm working on making it work with two belts since I think it is still slipping at times.
     

    Attached Files:

    rmstg2 likes this.
  10. sriley531

    sriley531 Big green hunk of $#*^....

    Heck, I kinda like it. Nitty gritty function over form engineering.
     
  11. jon2295

    jon2295 Well-Known Member

    That really was a good deal on the demon carb. Had to drive to Bayonne nj from eastern Long Island to get it. Trying to find some hose to use from the supercharger to the bonnet. Bought the hose that is the same brand as the bonnet but doesn't seem to fit right. Yeah I know duct tape? That is where the bov was mounted before I drilled and tapped the bonnet. The last pic is of the fuel pump fitting that goes to the bonnet getting boost referenced. I don't know if it actually works but this is how it was done in the 60's on the Shelby mustangs and on the old studebakers I think.
     
  12. jon2295

    jon2295 Well-Known Member

    Ok, so now that the supercharger is working, it is blowing oil out the breather and running down onto the exhaust manifold. Not sure what to do about that. I'm also wondering about what gearing to go with. Rolling at 15mph it breaks the rear tire loose. I'm thinking 3:08 posi may be enough to feel a difference and still be cruising friendly. Any thoughts and input would be appreciated. Thanks to this forum for all the info and ideas that got me started on this project.
     
  13. AZ-69 Skylark

    AZ-69 Skylark Well-Known Member

    There are breathers you can add to catch the oil I do believe. They are called oil catch cans, air-oil separators, etc.

    There is a saying:
    If it is stupid, but it works, it isn't stupid. :Smarty:

    Found some stuff that might help with the oil issue in these links.
    I don't think the all the mustang guys in the link are running forced induction.

    http://www.thirdgen.org/forums/power-adders/654567-oil-blow-under-boost.html

    http://www.allfordmustangs.com/forums/5-0l-talk/346916-oil-catch-can-help.html

    https://torquepost.wordpress.com/20...what-you-should-know-how-to-buy-choose-build/
     
    Last edited: Nov 2, 2014
  14. sailbrd

    sailbrd Well-Known Member

    I have been using the exhaust evac system. Have had a little problem with blowing the check valve on the passenger side. Will have to check the inlet tube and see whats going on there. Drivers side never has a problem. Works fine when the check valve is good.

    I was wondering about one v belt being able to handle the amount of power it takes to spin a blower. A single v belt can be shakey turning a high capacity alternator. Hope a double belt helps. You will need aftermarket pulleys to run double belts because each belt groove is a different diameter on a stock pulley. Not sure if anyone makes those for a 350.
     
  15. AZ-69 Skylark

    AZ-69 Skylark Well-Known Member

    I was doing some research and I saw where going above 10 PSI with the fuel pump boost referenced the way you have it doesn't work well. Didn't know if you knew that, but figured it might not hurt to mention.
     
  16. BrunoD

    BrunoD Looking for Fast Eddie

    Hi Jon,I have a 293 rear ,out of a 69 GS 400,complete sand blasted and ready to go.Bruno.
     
  17. jon2295

    jon2295 Well-Known Member

    thanks for the input guys. A few days after getting it all together, i lost the V pulley off the powerdyne during a test ride. At least i know that everything else will work. Now I am working on fitting the serpentine crank pulley to the engine. I dont plan on going beyond 5 psi so I think the fuel pump will be ok. If all works well i will upgrade the fuel pump and then get a smaller pulley to up the boost. Does anyone know if there is an adapter that might work for bolting the mustang pulley to the stock buick pulley? it looks like i might be able to widen the holes to match up.
     
  18. jon2295

    jon2295 Well-Known Member

    Bruno, I may be interested in the rear but not sure if it will bolt up( the drive shaft length may not be correct) I s it a 8.5? Posi? thanks
     
  19. AZ-69 Skylark

    AZ-69 Skylark Well-Known Member

    Maybe this will help.
    In the Max Performance Buick Engines book (page 102) the author claims that you can add a Chevy (spit) 6 rib belt to a Buick by going serpentine and adding the following:

    March Performance- Crank and water pump pulleys (it does not specifically say Buick or Chevy, but probably Buick)
    Alternator- 1986 Camaro with TPI and 3/4 inch spacers for the alternator bracket
    Water Pump- 1973 or newer 350 or 231

    FYI, due to some questionable info there are those who are not a fan of the book I mentioned.

    http://www.marchperf.com/index.html
     
  20. sailbrd

    sailbrd Well-Known Member

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