Another 1 for you mathematicians
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Topic: Another 1 for you mathematicians
Posted By: HD6GTOM
Subject: Another 1 for you mathematicians
Date Posted: 10 Nov 2019 at 8:49pm
| If you are running down the road at 70 mph with the tach sitting on 3500 rum's, how fast are you traveling when the tach is sitting on 9000 rpm's? I've been wondering this for 50 years. |
Replies:
Posted By: Dave H (NE)
Date Posted: 10 Nov 2019 at 8:56pm
|
179.9 mph |
Posted By: allisbred
Date Posted: 10 Nov 2019 at 8:59pm
| Would need to know the resistance- |
Posted By: steve(ill)
Date Posted: 10 Nov 2019 at 9:06pm
|
9000 / 3500 * 70 = 180 mph ------------- Like them all, but love the "B"s. |
Posted By: HD6GTOM
Date Posted: 10 Nov 2019 at 9:10pm
| Thanks guys. In glad my buddy's mom and dad never knew this. |
Posted By: allisbred
Date Posted: 10 Nov 2019 at 9:19pm
| We had a 3300# ‘67 Plymouth that would make power up to 7400rpm’s. For fun, put in a set of 3:55 gears, speedometer went past the 150 mark and toward the start pin and wasn’t up to 6500rpms. Car wasn’t stable enough to do any more(lost the chrome trim around the windshield on that venture)Not sure, but believe only had ~3500 @ 70? 9000 is a long way from there |
Posted By: LouSWPA
Date Posted: 10 Nov 2019 at 10:49pm
|
I got 180.57, but 180 is close enough for the girls we date ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
Posted By: chaskaduo
Date Posted: 11 Nov 2019 at 7:23am
|
Took my 74 Honda CB750 Four up to 100 on the speedo when I was 22 just to do it. Never again. She was screamin (had Hooker Header single pipes on her) and she was vibratin. With the wind force, it was all I could do to hang on. Talk about adrenaline, when I finally stopped and got off her, my eyes were buggin and I was a shakin. Don't remember what the tach was at, I'm pretty sure it was up there. 55mph seemed pretty slow after that. ------------- 1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp |
Posted By: IBWD MIke
Date Posted: 11 Nov 2019 at 7:34am
|
All that on tires that probably weren't even speed rated! |
Posted By: AC8010
Date Posted: 11 Nov 2019 at 8:06am
|
Heard a story one time about a guy that done that, just slowly increased speed till it was way up there. The problem came when he tried to slow down. Could get down to a certain point and it would start shaking, ended up laying it down. |
Posted By: LouSWPA
Date Posted: 11 Nov 2019 at 3:08pm
Yes sir, I can relate to that! Had a BSA 650 that I did the same thing. I doubt I hit 100, speedo said 105, but I doubt it. It was barely readable anyhow, vibrating so bad, no tach. It was shaking and vibrating so bad, front fork started to shimmy. I was afraid to use the brakes, just kept easing off of the gas very slowly and rode it out. It got worse before it got better! But that was back when I was invincible! ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
AC8010 wrote:Posted By: steve(ill)
Date Posted: 11 Nov 2019 at 4:41pm
|
But that was back when I was invincible! YEA... that was 40 years ago for most of us !! ------------- Like them all, but love the "B"s. |
Posted By: HD6GTOM
Date Posted: 11 Nov 2019 at 10:13pm
| 1968'1969 on multi mile G70x14 bias ply tires. |
Posted By: chaskaduo
Date Posted: 12 Nov 2019 at 7:30am
|
The tires on the Honda 750 were Goodyears. I bought the cycle off my uncle who was a serious rider and liked to go fast, so I'm pretty sure they were hi speed rated. But it was still scary as hell. ------------- 1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp |
Posted By: Tbone95
Date Posted: 12 Nov 2019 at 12:47pm
|
Chas, had a CB 500 Four myself.....I think 85 - 90 ish was all I could get out of that. Speed rated, schmeed rated, never thought of such things! Headers sounded pretty good! Drove a 1975 Chrysler Land Yacht to high school. 440, 4 barrel Holley. If you floored it from a dead stop, would not shift into third until 90mph, and the dang speedo would bounce off the peg at 100, no tach, so.....IDK?
|
Posted By: tadams(OH)
Date Posted: 12 Nov 2019 at 1:32pm
| When I was in the Army I drove from home to Columbus, Ohio every day, every Monday morning going south on I 71 a Corvette and I would run up to 120 and then back down to the speed limit, I had a 69 Dodge SuperBee with a 383 4 barrel |
Posted By: LouSWPA
Date Posted: 12 Nov 2019 at 10:07pm
I think you could safely claim a buck twenty and no one would doubt you! ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
Posted By: LouSWPA
Date Posted: 12 Nov 2019 at 10:12pm
Yep, I think that was more the norm! That's why 18 year olds make the best soldiers! They just don't know about dying, it's a foreign concept to them. ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
Posted By: Sugarmaker
Date Posted: 13 Nov 2019 at 8:32am
|
I thought the answer would be at 9000 rpm you would be setting on the side of the road picking up the engine parts? Yea scary stuff there guys! Glad I never did anything like that in a 1965 Ford Falcon with a 6 cyl and a car full of guys! Good thing I didnt ever have a bike too! Never was that good at darn word problems either!:) Regards, Chris ------------- D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet. |
Posted By: Tbone95
Date Posted: 13 Nov 2019 at 11:18am
120-130 I always thought looking back, yeah. Air ride shocks, load leveling, leather cushy seats, really did feel like you were flying! LOL! You watched the gas gauge go down as the speedometer went up.  One time, I was spending the night at a buddy's house, so was taking a different route to school. Another buddy came up behind me in his baby blue Malibu, coming up fast. Let him get to my rear bumper and punched it. Pulling away easily, I slowed back down to lead him along, about 95. All of the sudden, heard this weird mmmmoooWAAAAAHHH! noise, looked out my rear view and my entire exhaust was snaking down the lane behind me!
That Malibu had its hands full avoiding that mess! I'm sure that would have kicked me up at least 5mph on the top end, but couldn't have measured it!!! |
Posted By: SteveM C/IL
Date Posted: 13 Nov 2019 at 12:32pm
| Young and dumb. Fast was fun. We are lucky to still be alive....Don't even want to think about it! |
Posted By: chaskaduo
Date Posted: 14 Nov 2019 at 5:02am
What Age and what was the Tach at, are the Tires crush rated?  [TUBE]tJlB5K6JXm4[/TUBE] More on this https://www.youtube.com/watch?v=7gMlAl2cd2M" rel="nofollow - https://www.youtube.com/watch?v=7gMlAl2cd2M
------------- 1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp |