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The Water Cooler
Stupid Stuff
Guess the weight of Rocks in my cars.
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<blockquote data-quote="swampratt" data-source="post: 3530489" data-attributes="member: 15054"><p>Actually did that to a point but the calculator numbers to input are in my head.</p><p>336 is a given to make the math work.</p><p>336 X gear ratio X MPH divided by tire diameter = RPM</p><p></p><p>So I was running at the track often and the math there put the torque converter slip at worst summer heat at 10%</p><p>So You must add 10% to the final number to get RPM If the RPM in the equation was 7000 then add another 700 for converter slippage.</p><p>Other than that the math was straight forward.</p><p>336 X 370 X 176 divided by 31" = 7058 Now tire growth at speed is a factor also.</p><p>I was running 31 tall Hoosiers on 8" rims at 150+ expect 5% to 10% growth.</p><p>Say 5% so add 1.5" to tire diameter. 6732 RPM then the 10% slippage = 7405 RPM I ran it to 7600 RPM and quit looking at the tachometer in high gear 1:1 ratio.</p><p>And looked up in the rear view mirror and seen my buddies headlights dip down from him letting off the throttle so I backed off also.</p><p>It pulled to 7600 in first gear and I went to shift and shifter was in a bind and did not go into second but I was not letting off as I was in front.</p><p>I kept pressure on the shifter and seen 7800 rpm and quit looking, it shifted and second gear did the same thing.</p><p>I quit looking at the tachometer at 7800 again and it finally shifted..I was thinking that tweaked Yamaha V-Max will pass me any second.</p><p>He topped out at 147 and I was 3 school bus lengths ahead and he said I was pulling away like he was sitting still.</p><p></p><p>That short block is in my 57 chevy and just the other day I let a friend drive it and he can't shift and it went to 7800 RPM.</p><p>It has seen 8500 2 times..Knock on hard wood that 350 is holding together.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3530489, member: 15054"] Actually did that to a point but the calculator numbers to input are in my head. 336 is a given to make the math work. 336 X gear ratio X MPH divided by tire diameter = RPM So I was running at the track often and the math there put the torque converter slip at worst summer heat at 10% So You must add 10% to the final number to get RPM If the RPM in the equation was 7000 then add another 700 for converter slippage. Other than that the math was straight forward. 336 X 370 X 176 divided by 31" = 7058 Now tire growth at speed is a factor also. I was running 31 tall Hoosiers on 8" rims at 150+ expect 5% to 10% growth. Say 5% so add 1.5" to tire diameter. 6732 RPM then the 10% slippage = 7405 RPM I ran it to 7600 RPM and quit looking at the tachometer in high gear 1:1 ratio. And looked up in the rear view mirror and seen my buddies headlights dip down from him letting off the throttle so I backed off also. It pulled to 7600 in first gear and I went to shift and shifter was in a bind and did not go into second but I was not letting off as I was in front. I kept pressure on the shifter and seen 7800 rpm and quit looking, it shifted and second gear did the same thing. I quit looking at the tachometer at 7800 again and it finally shifted..I was thinking that tweaked Yamaha V-Max will pass me any second. He topped out at 147 and I was 3 school bus lengths ahead and he said I was pulling away like he was sitting still. That short block is in my 57 chevy and just the other day I let a friend drive it and he can't shift and it went to 7800 RPM. It has seen 8500 2 times..Knock on hard wood that 350 is holding together. [/QUOTE]
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Guess the weight of Rocks in my cars.
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