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#1
09-07-2020, 10:10 AM
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Labor Day Fun with a PSI calculation
Sparky got Slicks mounted to rims and set PSI to 15.00 LB each, per a trusted Gauge, while off the ground. Slick&Rim weight 20LB, and when set on ground shows a 9"x 3" contact patch while awaiting install.
When installed to car, the Slicks show a 10" x 8" contact Patch, and Rear Scales read 700 LB each. --> Sparky checked each laiden Slick PSI with that trusty gauge; What is the new PSI reading? (assume room temperature was constant on all items) Go |
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#2
09-07-2020, 10:18 AM
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17.5
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#3
09-07-2020, 10:59 AM
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15lbs
Sent from my SM-G965U using Tapatalk
__________________
68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight |
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#4
09-07-2020, 11:58 AM
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15 psi
(agree with leeklm) 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#5
09-07-2020, 07:39 PM
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Somewhere north of 15.00 PSI. I just don't know the calculation, nor the answer. Thanks for playing.
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#6
09-07-2020, 07:51 PM
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700 Lb on (10" x 8") is 700/80 is 8.75 PSI
20 Lb on (9" x 3") is 0.7 PSI. I think the 15.00 PSI will budge to 15.01 PSI with a 1351 LB load that also produces an assume slightly larger (10" x9") contact patch, for each tire. Representing a load just a tad higher than our atmoshperic pressure. Therefore Leeklm & Johnta1 were BOTH CORRECT. You two are both Winners.������ |
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