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Technical 393 Windsor carb size

Discussion in 'Traditional Hot Rods' started by rocketsled59, Oct 2, 2017.

  1. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
    Member

    Ok. Getting my tig welder set up. Gonna build some drain pipes ... as soon as I can get hotdogs pos comet outta my shop. Space is at a premium IMG_0870.JPG
     
  2. sdluck
    Joined: Sep 19, 2006
    Posts: 1,690

    sdluck
    Member

    Put a vacuum guage on the intake and read how much vacuum it pulls as the rpm increase.Usually a small carb seem to hurt at hi rpm. I used to work on spec sprints 2 barrel 4412 holley,steel block steel heads self starting and they would rpm just fine and dyno in the lo 600 hp range
     
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  3. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
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    Actually hotdogs car isn't a pos. I just tell him that cause it's turning out better than mine
     
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  4. Gammz
    Joined: May 10, 2015
    Posts: 674

    Gammz
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    from Lincoln Ne

    That your Glide off to the side there?


    Sent from my iPhone using The H.A.M.B. mobile app
     
  5. Kerrynzl
    Joined: Jun 20, 2010
    Posts: 1,629

    Kerrynzl
    Member

    This depends on your expectations. On a street car you can be under carbed . But on a race engine they need about 1.67 CFM per Horsepower.
    A 900CFM carb is good for an honest 540 Horsepower.
    The same carb could turn a 393 inch engine to 7900 rpm

    Using the old Torque x RPM √∑ 5252 = HP formula
    If we reverse the math the engine needs 369 Ft/Lbs of torque at that RPM.

    A 2 valve N/A race engine is about 80 Ft/lbs litre [ the holy grail for F1 engines is aproaching 100 Ft/lbs litre ][some Nascar engines are getting up there]
    393 inches = 6.44 litres so at maximum VE it should get 515 Ft/lbs
    The engine should be about 71% VE at 7900 RPM

    You'll need to "turn that baby hard"
     
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  6. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
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    Yeah. One of em. It's a bitchin bike. Built it as a tribute to one of my bros that passed
     
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  7. VTjunk
    Joined: Jul 5, 2013
    Posts: 271

    VTjunk
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    Unless I missed it, you never did say what you're running for timing, initial, total, what the curve is. Lots of good information here, but I cant help but think some part of the equation is missing.
     
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  8. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
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    Only 8 initial 32 overall. Didn't seem to like any more.
     
  9. VTjunk
    Joined: Jul 5, 2013
    Posts: 271

    VTjunk
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    I run 16 initial, 34 total, all in by 2800rpm. 8 is really low. Put 12-14 in it, see where the total is, back it down to 32, checking to see what rpm it stops advancing at.

    Dont know what distributor you're using, MSD has bushings, I run a stock 289 distributor with an electronic conversion, vac advance locked out, and played with swapping armatures with various amounts of advance slots. I make my own stop bushings to fine tune it.

    I spent some time tuning my car this past summer and went from a 2.3 60' to 1.66 and dropped a full second to 12.30s@116mph in a Falcon with a 10.5:1 289 with a stock C4, 4.10 gears.

    I struggled for a while battling the same things you're going through, doubting my engine combination, carb choice, etc. You've got the hardware, just tune it, you'll get what you expected out of it.
     
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  10. sdluck
    Joined: Sep 19, 2006
    Posts: 1,690

    sdluck
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    Good advice there,initial should be much higher then you are running,limit the total
     
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  11. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
    Member

    That's what I thought too. Last time we had it at the track the timing light took a dump. Car hasn't been out of the box since. Hoping to make some changes before spring. Have carb. Gonna build new headers and I'm trying to pull together the scratch for used victor jr heads I just came across.
     
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  12. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
    Member

    IMG_0937.JPG Score!!!
     

    Attached Files:

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  13. Gammz
    Joined: May 10, 2015
    Posts: 674

    Gammz
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    from Lincoln Ne

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  14. powrshftr
    Joined: Mar 29, 2013
    Posts: 4,544

    powrshftr
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    Are those heads stock?Do they have any porting or larger intake valves?
    They work great in stock form,but if they need any work (valve job,etc) that might be a great time to throw some porting work and some 2.08" intake valves at em.
    That 2.08" intake really wakes em up.:)
    Heck,even with those heads bone stock,you should be creeping up on 500hp with that cam.
    A ported version of those is essentially what I'm running on my motor.
    You've got me by 25ci,so you're gonna make a bunch more torque than me,and my little motor was able to make over 600hp with a tweaked set of what are essentially those same heads,so the car you guys are putting together should be a strong runner with a stroked Windsor in it.
    I'm really looking forward to seeing that car run,and being able to say hello and hang out at the track if I ever get mine back together.....lol

    Scott


    Sent from my iPhone using H.A.M.B.
     
  15. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
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    Actually these are for my falcon and I believe they are stock. . The car were building is a 357" Windsor.
     
  16. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
    Member

    Btw. I'm looking at a ram power grip HD clutch. Sintered iron. What's your opinions ? Experiences? Thanks.
     
  17. southcross2631
    Joined: Jan 20, 2013
    Posts: 2,415

    southcross2631
    Member

    Better have good driveline parts or a big shovel to pick up the not so good parts. that clutch is a non forgiving piece. Southeast Gassers use them and have already changed the rules to say aftermarket carrier for 9 inch Fords . 1350 u-joints should be used. If you have a toploader 4 speed ,plan on twisting the input shaft off or going to a big block one that has been cryo treated. Great clutch , just saying you better have everything else ready to take the shock.
     
  18. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
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    That I do not have. T 10 isn't the toughest box by any stretch. They make the power grip disc that is sintered iron one side organic on the other. Wonder if that may give a little more " cushion " ?
     
  19. powrshftr
    Joined: Mar 29, 2013
    Posts: 4,544

    powrshftr
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    That's the clutch I was running with the 302" motor,and it worked great,and was bulletproof,but as southern cross mentioned,at your power level,it may start eating u-joints,driveshafts,and axles if you have a bit of traction.

    For the new motor I have the next Ram clutch down the page from that one,which is their most aggressive single disc part,but I also went with 35spline axles,Nash trans,1350 U-joints,etc.
    It's a slippery slope.

    Scott


    Sent from my iPhone using The H.A.M.B. mobile app
     
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  20. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
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    The slipper clutch?
     
  21. powrshftr
    Joined: Mar 29, 2013
    Posts: 4,544

    powrshftr
    Member

    No,it does exactly the opposite of slip.Its like it locks right up with zero slippage.


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  22. powrshftr
    Joined: Mar 29, 2013
    Posts: 4,544

    powrshftr
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    The slippery slope I meant was when the real good clutch starts to expose the weaker links in the drivetrain....


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  23. saltflats
    Joined: Aug 14, 2007
    Posts: 8,520

    saltflats
    Member
    from Missouri

    Guessing you have hard side wall tires.
    Not sure what the cost is on these clutches but if the hard hittin one will take it...... get it broke in good then put a clutch tamer on it.
    Then just figure out what yellow to leave on. ;)
     
  24. saltflats
    Joined: Aug 14, 2007
    Posts: 8,520

    saltflats
    Member
    from Missouri

    And make sure you have a good clutch fork and pivot.
     
  25. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
    Member

  26. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
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    So before I pull the trigger on a ram power grip hd clutch , is there any reason I couldn't get a sintered iron disc and use my zoom pressure plate? It's a 30000 series zoom clutch
     
  27. powrshftr
    Joined: Mar 29, 2013
    Posts: 4,544

    powrshftr
    Member

    I don't feel like I'm qualified to comment on that one.
    I just call my guy at Ram,tell him what I need,then the parts show up,and hopefully I don't wreck em while I'm installing them.lol

    Scott


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  28. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
    Member

    IMG_1032.JPG IMG_1033.JPG IMG_1034.JPG Well I'll just keep adding to this thread. To update , I did get a quick fuel brawler 950 carb. I did get victor jr heads but I'm not gonna put them on till some other things are ironed out. Also scored a victor intake. Now I'm starting on the headers. Which seems like it's gonna take some time.
     
  29. rocketsled59
    Joined: Mar 14, 2010
    Posts: 610

    rocketsled59
    Member

    IMG_1035.JPG IMG_1036.JPG IMG_1037.JPG
    Wish it was a 4 banger. Damn
     
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  30. Gammz
    Joined: May 10, 2015
    Posts: 674

    Gammz
    Member
    from Lincoln Ne

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