Power Numbers
Test 1 shows the best power numbers from our first dyno test of the Magnuson 122 blower from the Sept. '06 issue. Static compression was 8.6:1 and max boost was 7 psi at 6,000 rpm. This test was performed on 91-octane pump gas.
Test 2 used forged Speed-Pro pistons, which bumped the compression to 10.2:1, a Quick Fuel 750 annular-discharge carburetor, and E85 fuel. Max boost was 7 psi but at a low 3,300 rpm. At peak power, the boost was only 6 psi.
Test 3 replaced the stock iron Vortec heads with a pair of aluminum 215cc TFS heads and a set of Crane Gold Race 1.6:1 roller rockers. Compression was slightly lower, but we added a smaller 2.70-inch-diameter blower pulley to generate 10 psi at peak torque and 12 psi at peak horsepower.
| RPM | TEST 1 | TEST 2 | TEST 3 |
TQ | HP | TQ | HP | TQ | HP |
| 2,000 | 412 | 162 | --- | --- | 550 | 209 |
| 2,200 | 426 | 178 | --- | --- | 563 | 237 |
| 2,400 | 449 | 205 | --- | --- | 575 | 263 |
| 2,600 | 462 | 229 | --- | --- | 587 | 290 |
| 2,800 | 476 | 254 | --- | --- | 599 | 319 |
| 3,000 | 470 | 268 | 537 | 308 | 611 | 349 |
| 3,200 | 480 | 292 | 535 | 325 | 620 | 378 |
| 3,400 | 495 | 320 | 545 | 354 | 626 | 406 |
| 3,600 | 500 | 343 | 551 | 379 | 630 | 432 |
| 3,800 | 511 | 370 | 554 | 400 | 631 | 456 |
| 4,000 | 512 | 390 | 555 | 422 | 630 | 480 |
| 4,200 | 512 | 410 | 555 | 444 | 628 | 502 |
| 4,400 | 510 | 427 | 551 | 462 | 624 | 523 |
| 4,600 | 509 | 445 | 540 | 474 | 618 | 542 |
| 4,800 | 500 | 457 | 523 | 478 | 610 | 558 |
| 5,000 | 499 | 475 | 506 | 481 | 599 | 570 |
| 5,200 | 490 | 485 | 494 | 489 | 587 | 581 |
| 5,400 | 472 | 485 | 491 | 505 | 575 | 591 |
| 5,600 | 461 | 491 | 485 | 519 | 564 | 601 |
| 5,800 | 449 | 496 | 459 | 507 | 541 | 598 |
| 6,000 | 441 | 504 | 386 | 441 | 484 | 552 |
| 6,200 | 420 | 496 | 283 | 335 | --- | --- |