Need pulley dimensions help

[smbony9]

hello can anyone tell me what pound pulley a 8 11/16 lower pulley
is

[Silver_2000]

He wants to know how many pounds of boost from a pulley that size

[Silver_2000]

from this spreadsheet an 8 and 3/4 " pulley would be about 5# of boost

http://www.svtlightnings.com/svt/how-to/blowerrpm.htm

[Mark #2]

Just in case, don't count the lip in the measurement.
Could be a 8.5" pulley measured where the belt rides, or a 4 lb.

[TXLIGHTNING]

Just in case, don't count the lip in the measurement.
Could be a 8.5" pulley measured where the belt rides, or a 4 lb.+1 4# pulley :tu:

[L8 APEX]

There was a good chart online somewhere. 7.5 stock, 8.25 #2, 8.65 #4, 9" was 6#, 10" was 10#? JLP site maybe. I just posting out my ass as usual.

[Silver_2000]

see xls linked above


STOCK JDM 2# PSI 2# METCO JL 3# JL 4# JL 5# JL 6# OTHER OD of the Lower Pulley (IN) 7.4 7.8 7.9 8 8.17 8.5 8.75 9 0 OD of the Upper Pulley (IN) 2.93 2.93 2.93 2.93 2.93 2.93 2.93 2.93 80 OD PCT OVER STOCK 0.00% 5.41% 6.76% 8.11% 10.41% 14.86% 18.24% 21.62% -100.00% OD PCT OVER STOCK 1.000 1.054 1.068 1.081 1.104 1.149 1.182 1.216 0.000 OPTOMISTIC PSI ABSOLUTE 23.5 24.8 25.1 25.4 25.9 27.0 27.8 28.6 0.0 OPTOMISTIC PSI GAUGE 8.5 9.8 10.1 10.4 10.9 12.0 12.8 13.6 -15.0 OPTIMISTIC PSI OVER STOCK 0.0 1.3 1.6 1.9 2.4 3.5 4.3 5.1 -23.5 BEST GUESS PSI OVER STOCK 0.0 1.2 1.4 1.7 2.0 2.7 3.2 3.7 #NUM! ADDED BLOWER DRAG hp (1) 0 8 11 13 17 24 30 36 #NUM! TORQUE INC OVER STOCK (FT-LB) 0 16 20 24 31 45 55 65 -300 BEST GUESS HP INC OVER STOCK 0 116 146 178 231 337 418 501 #NUM! ENGINE RPM BLOWER RPM 5000 12645 13329 13499 13670 13961 14525 14952 15379 0 5100 12898 13595 13769 13944 14240 14815 15251 15687 0 5200 13151 13862 14039 14217 14519 15106 15550 15994 0 5300 13404 14128 14309 14490 14798 15396 15849 16302 0 5400 13657 14395 14579 14764 15078 15687 16148 16609 0 5500 13910 14661 14849 15037 15357 15977 16447 16917 0 5600 14162 14928 15119 15311 15636 16268 16746 17225 0 5700 14415 15195 15389 15584 15915 16558 17045 17532 0 5800 14668 15461 15659 15858 16194 16849 17344 17840 0 5900 14921 15728 15929 16131 16474 17139 17643 18147 0 6000 15174 15994 16199 16404 16753 17430 17942 18455 0 The numbers below were calculated using different methods and give slightly different results







ENGINE RPM TOTAL BLOWER LOAD (hp) (1) 5000 56 62 63 65 67 72 76 80 7 5100 58 64 65 67 69 75 78 83 7 5200 60 66 68 69 72 77 81 86 7 5300 62 68 70 72 74 80 84 89 7 5400 64 71 72 74 77 83 87 92 7 5500 67 73 75 77 79 85 90 95 7 5600 69 76 77 79 82 88 93 98 7 5700 71 78 80 82 85 91 96 101 7 5800 73 80 82 84 87 94 99 104 7 5900 75 83 85 87 90 97 102 108 7 6000 78 86 88 90 93 100 106 111 7 ENGINE RPM BLOWER BELT LOAD (lbs) 5000 192 200 202 204 207 213 218 223 #DIV/0! 5100 195 203 205 207 210 217 222 227 #DIV/0! 5200 198 206 208 210 213 220 225 230 #DIV/0! 5300 201 209 211 213 216 223 229 234 #DIV/0! 5400 203 212 214 216 220 227 232 237 #DIV/0! 5500 206 215 217 219 223 230 236 241 #DIV/0! 5600 209 218 220 222 226 233 239 245 #DIV/0! 5700 212 221 223 225 229 237 243 248 #DIV/0! 5800 215 224 226 229 233 240 246 252 #DIV/0! 5900 218 227 229 232 236 244 250 256 #DIV/0! 6000 221 230 233 235 239 247 253 259 #DIV/0!