Walter Mikron I4 60 135 Continental O-200 100 188 Lycoming O-235 O4 100 207 Franklin 225 100 228 Lycoming O-290-A O4 125 244 Continental O-300 145 277 Lycoming O-320 150 272 Franklin 335 150 365 0.41 Lycoming O-360 180 282 0.64 Avia (Czech) M-337 I6 210 326 0.64 Continental R-670 210 430 0.49 Franklin 6A8-215-B8F O6 215 485 0.44 Lycoming GO-435-A O6 240 364 0.66 Lycoming O-540 250 396 0.63 Continental Tiara GO-406 285 382 0.75 Continental O-520 325 380 0.86 Lycoming GO-480-A1A6 340 492 0.69 Continental GSO-526 340 540 0.63 Lycoming GSO-580-C 375 560 0.67 P & W R985 R9 450 653 0.69 Lycoming O-720 520 597 0.87 Rotax 503 50 85 Great Plains VW 1600CC 55 160 Hirth F23-EP2 60 70 Jabira 60 119 PZL 2A-120 60 129 Rotax 582 63 95 Includes 20 lbs radiator, etc. Continental A-65 65 173 Limbach L 1800 66 154 Limbach L 1700 66 161 Rotax 618 74 136 Includes 20 lbs radiator, etc. Great Plains VW 2180CC 75 165 Franklin 225 75 230 Limbach L 2000 80 155 Rotax 912 80 165 Includes 20 lbs radiator, et Continental C-85 85 207 Limbach L 2400 94 181 Continental C-90 95 207 Great Plains VW 2600CC 96 190 Stratus Subaru EA-81 100 205 Continental O-200 100 220 CAM-100 100 225 Includes 20 lbs radiator, etc Formula Power C100 104 210 Rotax 914 115 155 Lycoming O-235 115 215 PZL 4A-235 116 226 Hirth F30-FP24 120 101 Continental IO-240 125 250 Continental O-300 145 277 Lycoming O-320-A 150 243 Lycoming O-320-D 160 253 Franklin 335 165 320 Formula Power F170 174 270 Lycoming O-360-A 180 265 Lycoming IO-360-A 200 293 NW Aero Ford V6 200 415 PZL 6A-350 205 330 Continental IO-360 210 350 NW Aero Chevy V6 230 420 Lycoming O-540-B 235 366 Lycoming O-540-E 260 368 Formula Power F260 274 390 Lycoming IO-540-K 300 443 Continental IO-520 300 459 Lycoming IO-720 400 568 Here are some certified engine weights. Thanks to Dirk Rackley at Vortec for obtaining this data. Engine Horsepower Weight Ratio O-200-A 100 190 0.53 O-200-B 100 190 0.53 O-300-A 145 268 0.54 O-300-E 145 268 0.54 IO-346 165 297 0.56 IO-360-B 210 327 0.64 TSIO-360-A 210 334 0.63 O-470-J 225 381 0.59 O-470-R 230 438 0.53 O-470-13 225 414 0.54 O-470-15 190 405 0.47 IO-470-C 250 432 0.58 IO-470-D 260 426 0.61 IO-470-E 260 461 0.56 IO-470-F 260 464 0.56 IO-470-V 260 472 0.55 TSIO-470-D 260 511 0.51 IO-520-L 285 466 0.61 O-200-A 100 190 0.53 O-200-B 100 220 0.45 O-300-A 145 268 0.54 O-300-E 145 268 0.54 IO-346 165 297 0.56 IO-360-B 210 327 0.64 TSIO-360-A 210 334 0.63 O-470-J 225 381 0.59 O-470-R 230 438 0.53 O-470-13 225 414 0.54 O-470-15 190 405 0.47 IO-470-C 250 432 0.58 IO-470-D 260 426 0.61 IO-470-E 260 461 0.56 IO-470-F 260 464 0.56 IO-470-V 260 472 0.55 TSIO-470-D 260 511 0.51 IO-520-L 285 466 0.61 O-235-C1B 115 240 0.48 O-290-D2C 140 263 0.53 O-320-A2B 150 272 0.55 O-320-A2C 150 271 0.55 O-320-B2C 160 277 0.58 O-320-D2A 160 277 0.58 O-320-E2A 160 277 0.58 IO-320-B1A 160 285 0.56 IO-320-C1A 160 294 0.54 IO-320-E2A 150 280 0.54 O-360-A1D 180 284 0.63 O-360-A3A 180 285 0.63 IO-360-A1A 200 320 0.63 IO-360-B1B 180 295 0.61 IMO-360-B1B 225 274 0.82 GO-480-B1D 270 432 0.63 GO-480-G1D6 295 437 0.68 IGO-480-A1B6 295 469 0.63 IGSO-480-A1F6 340 498 0.68 O-540-A1A5 250 396 0.63 O-540-B2B5 235 395 0.59 O-540-B4B5 235 395 0.59 O-540-B4B5 260 398 0.65 IO-540-A1A5 290 437 0.66 IO-540-C4B5 250 402 0.62 IO-540-D4A5 260 402 0.65 IO-540-E1A5 290 437 0.66 IO-540-G1A5 290 443 0.65 IO-540-J4A5 250 409 0.61 IO-540-K1A5 300 470 0.64 AEIO-540-L1B5D 300 476 0.63 IGO-540-B1C 350 500 0.70 IGSO-540-A1D 380 530 0.72 IGSO-540-B1A 380 532 0.71 TIO-540-A1A 310 535 0.58 TIO-541-E1A6 380 632 0.60 TIOGO-541-A1A 400 663 0.60 IO-720-A1A 400 597 0.67 Engine Horsepower Weight ----------------------------------- O-200-A 100 190 O-200-B 100 190 O-300-A 145 268 O-300-E 145 268 IO-346 165 297 IO-360-B 210 327 TSIO-360-A 210 334 O-470-J 225 381 O-470-R 230 438 O-470-13 225 414 O-470-15 190 405 IO-470-C 250 432 IO-470-D 260 426 IO-470-E 260 461 IO-470-F 260 464 IO-470-V 260 472 TSIO-470-D 260 511 IO-520-L 285 466 O-200-A 100 190 O-200-B 100 220 O-300-A 145 268 O-300-E 145 268 IO-346 165 297 IO-360-B 210 327 TSIO-360-A 210 334 O-470-J 225 381 O-470-R 230 438 O-470-13 225 414 O-470-15 190 405 IO-470-C 250 432 IO-470-D 260 426 IO-470-E 260 461 IO-470-F 260 464 IO-470-V 260 472 TSIO-470-D 260 511 IO-520-L 285 466 O-235-C1B 115 240 O-290-D2C 140 263 O-320-A2B 150 272 O-320-A2C 150 271 O-320-B2C 160 277 O-320-D2A 160 277 O-320-E2A 160 277 IO-320-B1A 160 285 IO-320-C1A 160 294 IO-320-E2A 150 280 O-360-A1D 180 284 O-360-A3A 180 285 IO-360-A1A 200 320 IO-360-B1B 180 295 IMO-360-B1B 225 274 GO-480-B1D 270 432 GO-480-G1D6 295 437 IGO-480-A1B6 295 469 IGSO-480-A1F6 340 498 O-540-A1A5 250 396 O-540-B2B5 235 395 O-540-B4B5 235 395 O-540-B4B5 260 398 IO-540-A1A5 290 437 IO-540-C4B5 250 402 IO-540-D4A5 260 402 IO-540-E1A5 290 437 IO-540-G1A5 290 443 IO-540-J4A5 250 409 IO-540-K1A5 300 470 AEIO-540-L1B5D 300 476 IGO-540-B1C 350 500 IGSO-540-A1D 380 530 IGSO-540-B1A 380 532 TIO-540-A1A 310 535 TIO-541-E1A6 380 632 TIOGO-541-A1A 400 663 IO-720-A1A 400 597