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Using Compression to Make Horsepower in a Small Block Chevy - Danger Mouse Part 23

Part 23: Squeeze Play

By Mike Petralia

Danger Mouse specs for Part 21 - Test 36*:
*Last test from previous month355 cid, 10:1 cr, 4.030-bore 4-bolt Motown block, 3.48-stroke Lunati crank, 5.7-inch Lunati rods, Lunati flat-top forged pistons, Total Seal ductile iron Gapless top rings, Edelbrock Victor Jr. heads (64cc chambers, 215cc runners, 2.08-inch intake valves, 1.60-inch exhaust valves), Edelbrock Super Victor intake manifold, COMP Cams XR286R solid roller camshaft installed at 105 intake CL (248/254 at .050, 286/292 adv, .606/.612 lift with COMP 1.6:1 rockers, 110 LS), Holley HP1000 carb, and 38 degrees total ignition advance

Danger Mouse specs for Part 23 - Test 37:
New 12.5:1cr Lunati pistons, Carb Shop modified Holley HP950, 36 degrees total ignition advance

Danger Mouse specs for Part 23 - Test 38:
Same as T37, but swapped to 105 octane fuel

Danger Mouse specs for Part 23 - Test 39:
Same as T38, but installed Pertronix distributor with timing curve starting at 18 degrees initial

We're always looking for new ideas. Do you have a better one for Danger Mouse?

Send your test suggestions to:
Super Chevy Magazine
Attn: DANGER MOUSE
720 Hundley Way
Placentia, CA 92870
Or e-mail: terry.cole@primedia.com

Test 36 Test 37 T36 vs. T37 Test 38 Test 39 T37 vs. T39
RPM TQ HP TQ HP TQ HP TQ HP TQ HP TQ HP
2600 353 175 371 184 +18 +9 371 184 365 181 -6 -3
2800 375 200 365 194 -10 -6 377 201 385 205 20 +11
3000 390 223 378 216 -12 -7 374 214 384 220 +6 +4
3200 393 239 388 236 -5 -3 389 237 396 241 +8 +5
3400 388 251 388 251 0 0 390 253 396 256 +8 +5
3600 395 271 391 268 -4 -3 402 276 406 279 +15 +11
3800 407 294 404 293 -3 -1 413 299 416 301 +12 +8
4000 416 316 414 315 -2 -1 411 313 421 320 +7 +5
4200 421 336 422 338 +1 +2 416 333 424 340 +2 +1
4400 428 359 426 357 -2 -2 422 354 429 360 +3 +3
4600 437 383 439 385 -3 -2 438 383 445 390 +5 +5
4800 448 409 453 414 +5 +5 453 414 459 419 +6 +5
5000 454 432 463 441 +9 +9 464 442 469 447 +6 +6
5200 455 451 466 461 +11 +10 470 465 473 468 +7 +7
5400 453 466 467 480 +14 +14 469 482 472 485 +5 +5
5600 452 482 464 495 +12 +13 466 496 467 498 +3 +3
5800 450 497 460 508 +10 +11 462 510 463 511 +3 +3
6000 443 506 456 521 +13 +15 458 523 460 525 +4 +4
6200 430 508 453 534 +23 +26 455 537 455 537 +2 +3
6400 416 507 447 544 +31 +37 446 544 448 546 +1 +2
6600 N/D N/D 435 547 N/A N/A 438 550 438 550 +3 +3
6800 N/D N/D 425 550 N/A N/A 427 552 427 552 +2 +1
7000 N/D N/D 414 552 N/A N/A 414 552 414 552 0 0
Max 455 508 467 552 +12 +44 470 552 472 552 +5 0
Avg 420 365 426 395 +6 +30 427 396 431 400 +5 +5

Note how DM's torque kinda' moved all around the map at the bottom of the curve, but stabilized up top. Most likely, that was due to detonation with the pump gas in T37 and a lack of any type of timing curve in T38. T39 had the benefit of both higher-octane gas and a timing curve to boost low-end power considerably. Also note that top end power never changed.

By Mike Petralia
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