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  #16  
Old 12-13-2015, 09:24 PM
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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
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  #17  
Old 12-14-2015, 12:04 AM
dhbfaster dhbfaster is offline
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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.
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  #18  
Old 12-14-2015, 12:38 PM
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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....
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  #19  
Old 12-14-2015, 12:55 PM
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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.
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  #20  
Old 12-14-2015, 01:37 PM
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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....
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  #21  
Old 12-14-2015, 01:42 PM
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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!
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  #22  
Old 12-14-2015, 02:04 PM
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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!!!!!!!!!!!
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  #23  
Old 12-14-2015, 02:59 PM
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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!
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  #24  
Old 12-14-2015, 07:24 PM
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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.
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  #25  
Old 12-14-2015, 10:41 PM
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Tire growth!! I never thought about that!
Just like the dragsters.
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  #26  
Old 12-15-2015, 12:44 PM
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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!!
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  #27  
Old 12-16-2015, 04:17 PM
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Drag Racing

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

https://www.youtube.com/watch?v=FjQJ8btRbLY
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  #28  
Old 12-19-2015, 12:26 AM
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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
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  #29  
Old 12-19-2015, 07:41 AM
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Sweet...throw us a pic when you have a chance.
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  #30  
Old 12-19-2015, 12:19 PM
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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
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