When to run a stall converter?

Discussion in 'Small Block Tech' started by Reidk, Nov 16, 2020.

  1. Reidk

    Reidk Well-Known Member

    There is a napa 2 miles from me. The description on this same light when googling it seems pretty impressive. I like that it'll display rpm. 109 bucks ain't too bad. But if there's a reason to stay away from this brand I will.
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    No, that light will be just fine. You asked for something cheaper in price, and I know you are probably one step out of the dog house with the wife, and all the money you are spending.:D
     
    Reidk likes this.
  3. Reidk

    Reidk Well-Known Member

    Yeah but in this case I can justify it. But if there were any store brand timing lights that offered the same functions at a decently lower price I would consider them too. I get 10% discount at the local napa because I have an account there. So it'll be less then double the price of a decent used one but something new with modern features. I'll throw the receipt in with other business expenses and write it off. And I am determined to find a way to get the tachometer, H pipe kit, and exhaust bought. Just gotta spread the purchases out lol. Also looking at flexible braided tranny coolant lines... when will it end? I would love to have this project 100% done by Spring. This time of year I have nothing but time...spring through fall I work 70 hours per week.
     
    Last edited: Jan 10, 2021
  4. Reidk

    Reidk Well-Known Member

    Some reason Summit did not have the amount of mechanical Advance listed on their website. So I went directly to ProForms website and it has 22° Advance built into it. Should i trust proform or should I go ahead and install the lighter springs and rev it up to verify? This probably explains why it runs good at 8* initial


    https://www.proformparts.com/produc...p-built-in-coil-red-cap-fits-buick-v8-engines
    Here it is
     
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I would use the springs to verify Proform's stats. It's good practice, don't you think?
     
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  6. Reidk

    Reidk Well-Known Member

    Olio
    Alot of you guys get all of your advance in around 2500rpm or less. It doesn't look like this kit is going to allow that...
    20210111_094743.jpg
     
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  8. Reidk

    Reidk Well-Known Member

    I already have an adjustable vacuum advance. Really all I need is a lighter spring at this point? I will go ahead and see if this gold spring is at least a little bit lighter than the one that came in my ProForm but I'm starting to think that it's probably not.


    Supposed to be 40 degrees for the next couple of days. Snow should melt. I don't want to mess with any timing stuff until I see how the carb adjustments affected my car. Should be able to tune by Friday afternoon.
     
  9. Reidk

    Reidk Well-Known Member

    I have my timing set. 14-15 initial. 36-37 total. All in around 2500 rpm. But I was doing it by myself so I will double check again with a helper. Seems to run good. But I will probably back it off just a little. Distributors advertised mechanical advance was spot on. Vacuum advance has been adjusted to where the total combined is around 47-48 at around 3000rpm. I didnt take notes so I could be a little off. I finally had a decent day to test and tune. I made the carb as rich as possible with the jets. I also added a bigger accelerator pump nozzle. Test drive was better but not at all what I was looking for. I used a metering rod to go even richer. Made the car worse so I went a couple steps leaner with the rods and actually have the best performance yet. Nice low end power but I know it can be improved. If Im cruising and hammer it, it still has a bad hesitation. Maybe a bigger jet for the secondaries? It's now raining and snowing again. Be a few days before I mess with it again.
     
  10. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Play with the rear air valve spring wind up adjustment. If the air valve flops in too fast, it bogs. Tighten the spring tension a little at a time and test.

    AVSCarburetorAirValve.JPG
     
    Last edited: Jan 14, 2021
  11. Reidk

    Reidk Well-Known Member

    I have been adjusting it. I can go a half turn tighter before I hit the max that they recommend. I was going to try messing with this some more but the weather got real bad real quick. I'm a little concerned I went too rich with secondary but not sure. Was shocked by the improvement I got with leaning out the primary a little. I have a few more rod combinations to try.
     
  12. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Last edited: Jan 14, 2021
    Reidk likes this.
  13. Reidk

    Reidk Well-Known Member

    My brother keeps telling me to get the gauge as well. Most of the kits come with just one 02 sensor. Will the air fuel ratio off of one bank be sufficient or should i just get a kit with 2 sensors? I'm pretty sure I'll end up getting a double pumper. Mart contacted me with a Holley horsepower carb that he has for sale. I'm interested in that.
     
  14. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    One sensor is fine, it's all I have. The SP3 is a single plane intake and draws from one plenum.
     
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  15. Mart

    Mart Gold level member

    I run dual a/f meter and L & R read very close to each other.
    One will be fine.
     
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  16. Fox's Den

    Fox's Den 355Xrs

    In the end you will get that Holley or equiv.

    When you stomp to the floor there is a giant hole that needs gas, plus the intake is cold now without the heat from the crossover being blocked now. That means you need even more gas just like when it is cold out and you need the choke to keep the engine running.

    That means you need a big squirt and one that needs to go long until the main system of the carb starts to run namely the venturies.

    That is a part you have to keep playing with until you get it right.

    Playing with the secondary spring is not going to help with the bog. The shot of gas is either shooting too much gas or it is not enough. That is where you need to go first, you might as well tighten up the spring to keep from opening too fast until you get the pump shot worked out.

    I bet I can go out right now with it 35* out and I bet that car of mine will start right up and sit there and idle without any choke, since I don't have one anyways.

    If that carb is a 650 it should technically be faster out of the hole since it is smaller and the transition from pump shot to venturi should be quicker.

    Double pump the bi*** and don't look back You will have 2 accelerator pumps and not 1.
     
    70skylark350, partsrparts and Reidk like this.
  17. Reidk

    Reidk Well-Known Member


    This is my hei cap. There is a plastic divider inside that is busted off. This happened 9 months ago when I first installed it. I noticed it again yesterday. Should I go ahead and replace the cap? The engineers put them there on purpose. Not sure what their purpose is though.

    20210114_101901.jpg
     
  18. Reidk

    Reidk Well-Known Member

    I'm finally really understanding how to tune this thing. I went too rich at first with my primaries. I think my jets might be too rich on the secondary side too. I can get an accelerator pump meant for an 800 cfm carb for like 15 bucks. I believe it was too lean with the factory setup but not as bad as I thought. It was more in the pump shot.
     
  19. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    No.
     
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  20. Reidk

    Reidk Well-Known Member

    Would like to get this carb crap figured out before spring. I'm pretty sure I'm giving up on the edelbrock. I have done a dozen jet and metering changes. And has the biggest accelerator nozzle and stiffest spring. runs great at certain rpms but I can't tune out the dead spots.

    I have gone too rich with some of my edelbrock 650 adjustments. I am afraid an out of box 750 is going to need jetted down alot. Would it be better to go with a 650 or 670 double pumper. Here's a 750 that I like.
    https://www.summitracing.com/parts/qft-br-67320
     
    Mark Demko likes this.

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