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Thread: Drag Racing

  1. #16
    Join Date
    Dec 2006
    Location
    Mill Creek
    Posts
    1,226
    According to this site, my RPM would be 2481 @ 70MPH
    with 265 60R 14 tires and .68 transmission ratio with the 4.11 gears.
    That works well for me.


    Larry



    http://www.csgnetwork.com/multirpmcalc.html
    Larry Smith
    1964 Futura
    347 stroker



  2. #17
    Join Date
    Jul 2013
    Location
    Federal Way
    Posts
    906
    That tool is definitely simpler. I plugged your tire size into the other one just to see if I would get the same answer and I did. It is kind of cool to push the throttle up and see what happens. With 400hp, tach at 4237, if your car is 3000 lbs, you're running 119.52. I have no idea if I did any of this right but I'm starting to think after I finish Granddad's falcon, I'm going to need another one so we can race each other.
    Attached Images Attached Images
    Don Bartlett
    Federal Way, WA
    61 Four Door Sedan
    144-6, 3 on the tree



  3. #18
    Join Date
    Oct 2006
    Location
    Woodinville, WA
    Posts
    451
    Okay... I ran the numbers.
    From the best I can figure, based on the 235-60x14 tire size, the tire diameter should be about 32.5 inches. That computes to 102 inches per revolution (pi x diameter). At 70 mph, that would be 724 rpm at the wheel. Multiply by 4.11 for the rear end gear, and then again by .68 for the transmission (overdrive), I get 2023 rpm at the crankshaft.

    This seems inconsistent with the previous calculations. Can't explain it....
    Gary MacDonald
    ROGER's...
    EX... '63 Hardtop
    Had...
    Scarebird front discs
    200 w/ CI alum head
    C4

  4. #19
    Join Date
    Jul 2013
    Location
    Federal Way
    Posts
    906
    Humm...we seem to have two tire sizes in the thread (but I'm not sure that's it alone), but the tire calculator I have been using is giving a different diameter and circumference than what you are showing.
    According to: https://tiresize.com/calculator/

    235/60 R14 should be 25.1" diameter, 78.8 circumference
    265/60 R14 should be 26.5" diameter, 83.3 circumference

    If this tire calculator is correct, that might be the difference.
    Don Bartlett
    Federal Way, WA
    61 Four Door Sedan
    144-6, 3 on the tree



  5. #20
    Join Date
    Oct 2006
    Location
    Woodinville, WA
    Posts
    451
    Yeah, I forgot the aspect ratio.
    Tire diameter should be 25.1 inches.
    937 rpm at the wheel;
    2311 rpm at the crank.

    I stand corrected... as usual....
    Gary MacDonald
    ROGER's...
    EX... '63 Hardtop
    Had...
    Scarebird front discs
    200 w/ CI alum head
    C4

  6. #21
    Join Date
    Oct 2006
    Location
    Woodinville, WA
    Posts
    451
    I am absolutely no good at arithmetic. I goofed again!!

    This time I used .60 at the trans instead of .68!!

    Should be 2620 rpm at the crank!
    Gary MacDonald
    ROGER's...
    EX... '63 Hardtop
    Had...
    Scarebird front discs
    200 w/ CI alum head
    C4

  7. #22
    Join Date
    Dec 2006
    Location
    Mill Creek
    Posts
    1,226

    Drag Racing

    Okay you guys, this is getting over my head again. On the site I sent it said that my tire size equates to 26.5" tall. They also mention that the tire will grow in circumference as the speed increases, but this is supposedly incorporated into the equation.

    If I enter in 26.5 in the charts of most of the different sites it comes out almost exactly the same at 2480 RPM at 70 MPH. Let me know if you find something else and thanks for all your help.

    NOW..... Lets get more of our cars at the drag strip this year and see what kind of fun we can have. The cars don't have to be fast to have a blast. My car won't come close to the times and speeds that are listed. I would be happy if it ran in the 12's at around 105MPH. This would be a great trip for our club to go to the drag strip!!!!!!!!!!!
    Larry Smith
    1964 Futura
    347 stroker



  8. #23
    Join Date
    Oct 2006
    Location
    Woodinville, WA
    Posts
    451
    Yeah! Using 26.5 for the tire diameter I get 2481 rpm also.
    My calculations do not include tire growth, nor do I trust the tire diameter I came up with originally (25.1). There is a theoretical size that can be computed from the size designation, but in actual practice, the diameter can deviate from that by quite a bit!
    Gary MacDonald
    ROGER's...
    EX... '63 Hardtop
    Had...
    Scarebird front discs
    200 w/ CI alum head
    C4

  9. #24

    Yellow Falcon

    Quote Originally Posted by BadBird View Post
    I was looking at a mustang forum and just about puked. Guy wants different gears but was worried that the extra RPM's might make it hard to hear on his cell phone?????? What the heck???? Probably wouldn't want low gears and spill his coffee??? Times have definitely changed, and what the heck, I am 68 years old and still want to get the front wheels off the road.
    This is funny as heck.
    Dennis Pierson
    Tampa, FL
    "The Wonder Falcon"

    '63 Futura Hardtop (260, Ford-O-Matic, bench seat)

  10. #25
    Join Date
    Jul 2013
    Location
    Federal Way
    Posts
    906
    Tire growth!! I never thought about that!
    Just like the dragsters.
    Don Bartlett
    Federal Way, WA
    61 Four Door Sedan
    144-6, 3 on the tree



  11. #26
    Join Date
    Oct 2006
    Location
    Woodinville, WA
    Posts
    451
    Quote Originally Posted by BadBird View Post

    I would be happy if it ran in the 12's at around 105MPH.
    I stumbled upon a video a while back of a 12-second Falcon. It was tubbed, and powered by a radical, but naturally aspirated, 200 six! It made a 1/4-mile pass in 12-something seconds at 98 mph. But now I when I look for that video again, I CAN'T FIND IT!!
    Gary MacDonald
    ROGER's...
    EX... '63 Hardtop
    Had...
    Scarebird front discs
    200 w/ CI alum head
    C4

  12. #27
    Join Date
    Dec 2006
    Location
    Mill Creek
    Posts
    1,226

    Drag Racing

    I could only find this one. Not the one you mentioned though. Larry

    https://www.youtube.com/watch?v=FjQJ8btRbLY
    Larry Smith
    1964 Futura
    347 stroker



  13. #28
    Join Date
    Dec 2006
    Location
    Mill Creek
    Posts
    1,226

    Drag Racing

    Received the 9" ford housing and axles today along with the backing plates and bearings. I don't have the money to get the third member yet, but will have plenty to do over the next couple of months.

    I need to paint the housing and get it installed. Install the line lock assembly and drive shaft loop.

    I am ordering a shift light tomorrow and hope it isn't too hard to understand the installation. I hate electronics and a lot of you can remember from my thousand questions during the build of my Falcon.

    Hope to get the 3rd member ordered after the first of the year and will go with 4.11 gears with the trac-loc.

    Larry
    Larry Smith
    1964 Futura
    347 stroker



  14. #29
    Join Date
    Jul 2013
    Location
    Federal Way
    Posts
    906
    Sweet...throw us a pic when you have a chance.
    Don Bartlett
    Federal Way, WA
    61 Four Door Sedan
    144-6, 3 on the tree



  15. #30
    Join Date
    Oct 2006
    Location
    Woodinville, WA
    Posts
    451
    Quote Originally Posted by MacDee View Post
    I stumbled upon a video a while back of a 12-second Falcon. It was tubbed, and powered by a radical, but naturally aspirated, 200 six! It made a 1/4-mile pass in 12-something seconds at 98 mph. But now I when I look for that video again, I CAN'T FIND IT!!
    FOUND IT!
    https://video.search.yahoo.com/searc...f2&action=view
    Gary MacDonald
    ROGER's...
    EX... '63 Hardtop
    Had...
    Scarebird front discs
    200 w/ CI alum head
    C4

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