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Chevy Small Block Cam - Separation Of Power

Does Lobe Separation Really Matter?

By Mike Petralia

This proves that the entire package is very important to consider when choosing the correct camshaft, and in most cases you'd be wise to consult an expert, not your buddies unless they're also cam experts, when selecting the perfect cam. As we learned in our tests, any cam can work well, but some cams can work better than others.

Separating the Power
Look closely at the two power curves for all cams. Note how the 106 and 110 lobes practically duplicate each other. Comp explained that since the engine we tested used a single-plane intake manifold and open headers, it breathed well and didn't need much help scavenging the cylinders. The 106 cam probably over-scavenged just a bit too much, and the 110 probably under-scavenged an equal amount, so the dyno pulls look almost identical.

Since the 108 lobe performed best, it showed that this engine liked only a little scavenging, and the 112 and 114 lobes' poor performance meant the this engine liked to breathe with a little bit more overlap to make the best power. The average and maximum power figures tell the biggest story. One true benefit to running a higher-lobe-separation cam is a better idle quality with more vacuum, so we listed vacuum at 1,000 rpm for each cam to compare. These results represent horsepower averaged from three consecutive dyno pulls with each cam.

Horsepower
L/S 106 108 110 112 114
RPM HP HP HP HP HP
3600 258 262 261 264 261
3800 281 384 282 283 280
4000 311 311 308 307 302
4200 333 338 333 330 325
4400 353 362 356 352 347
4600 375 382 375 373 369
4800 393 399 392 390 386
5000 409 415 409 407 404
5200 427 432 429 424 421
5400 441 446 444 435 436
5600 453 458 455 445 446
5800 459 465 461 449 451
6000 464 470 465 451 453
6200 469 474 469 452* 455*
6400 470* 476* 470* 449 453
Avg 387 392 388 382 380
Max 470 475 470 452 455
Vac 10” 12” 13” 14.5” 15”
Torque
L/S 106 108 110 112 114
RPM TQ TQ TQ TQ TQ
3600 377 382 381 385 380
3800 389 393 390 392 386
4000 409 409 405 404 397
4200 416 423 416 413 406
4400 421 432 425 420 414
4600 428 437* 428 426 421
4800 431* 436 429 427 422
5000 430 436 430 427 424
5200 431 436 433* 429* 425*
5400 429 434 432 423 424
5600 425 429 426 417 418
5800 416 421 417 406 409
6000 406 412 407 395 397
6200 397 402 397 383 386
6400 385 391 385 369 372
Avg 414 419 415 409 407
Max 431 437 433 429 425
SOURCES
COMP Cams Iskenderian Racing Cams
16020 South Broadway,
Dept. MMFF
Gardena
CA  90247-9990
Crane Cams
530 Fentress Blvd.
Daytona Beach
FL  32114
3-86/-252-1151
N/A
www.cranecams.com
Jesel Inc.
1985 Cedarbridge Avenue
Dept. MMFF
Lakewood
NJ  08701
Crower Cams
San Diego
CA
619-661-6477
www.crower.com
Westech Performance Group
11098 Venture Dr., Unit C
Mira Loma
CA  91752
9-09/-685-4767
www.westechperformance.com
Erson Cams
550 Mallory Way
Carson City
NV  89701
775-882-6600
www.mrgasket.com/erson.htm
By Mike Petralia
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