Author Topic: Speed calculator for peerless 400  (Read 10623 times)

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Offline crazycraftsman

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Re: Speed calculator for peerless 400
« Reply #15 on: May 11, 2015, 10:17:39 am »
I'm shouting for 60 mph in 2nd gear, so I have a 20/23/24/26 trans sprocket I should be able to get close. I'm going to try marking the flywheel and tire and rotating in each gear to get the final ratio and see if it's the same or close to what we have above. Thanks for your help!!!
owen
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Offline redline

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Re: Speed calculator for peerless 400
« Reply #16 on: May 11, 2015, 10:23:27 am »
I calculate mine an easier way.
I just go faster than everyone else on the track.
It's a time saver.
Ed King

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Offline stvn_VA

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Re: Speed calculator for peerless 400
« Reply #17 on: May 11, 2015, 11:06:28 am »
Let me try it this way.  All math will be 1(one) engine revolution.  Engine pulley is 8" Transmission is 5"

1 engine revolution will equal 1.6 revolutions on the input shaft of the tranny.

Using the 350/400 gearbox here.   The input shaft has a 13 tooth pinion gear into a 33 tooth bevel gear.

So the 13 tooth turns 1.6 times but only turns the 33 tooth .630303 times (13/33)X1.6=.630303

Now the 33 bevel gear is on the same shaft as the 25 tooth part of 3rd gear so the 25 portion of third gear turns .630303 times per 1 engine revolution.

The output shaft of the tranny is a 30 tooth driven by the 25 tooth that has just turned over .630303 times.

The 30 tooth turns .525252 times (25/30)x.630303 per 1 engine revolution.

So the output shaft of the 350/400 transmission in 3rd gear turns .525252 times per 1 engine revolution.

Using a 14 tooth sprocket on the tranny to a 44 on the axle.

The 14 tooth just turned .525252 times but only turned the 44 .167126 (14/44)x.525252=.167126

So one(1) engine revolution turns the axle .167126

Using a 49" roll out on the tire & cranking 7,000 RPMs

7000x.167126=1169.882 tire rotations per minute

1169.882x49= 57,324.22 inches traveled per mintue

57324.22/12= 4777 feet traveled per minute

4777x60= 286,620 feet per hour

286,620/5280(feet in a mile)= 54.28 MPH in 3rd gear turning 7,000 RPM




At the end of the day and having to take my shoes off to count my toes and even having to count some of my wife's toes this is what i come up with in order for you to run 60+ in second gear.

Engine RPM's = 7,000
Engine Pulley = 8"
Transmission Pulley = 5"
Second Gear = 21/34
Transmission Sprocket = 26
Axle Sprocket = 44
Tire Roll Out = 41"

MPH = 62.5
Steven
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Offline Nkaratzas89

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Re: Speed calculator for peerless 400
« Reply #18 on: May 11, 2015, 07:38:27 pm »
What class are you running that runs a peerless 400 and goes 60+ in 2nd gear?! Unless your running super mod with a 400, which i would be interested to see how you set that up! Haha glad you got it figured out!
Nico
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Offline crazycraftsman

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Re: Speed calculator for peerless 400
« Reply #19 on: May 12, 2015, 12:42:49 am »
Thanks!!! Steven and Zach. I marked my flywheel and wheel in each gear and the final ratios were dead on!
Thanks for your help. I've been going a lot faster than I thought. Lol and ED KING I always go fast even if I get beat, these are lawnmowers !!
owen
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