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Weiand Small Block - Pt. 25: Ramming Power

Who Says You Can't Add Torque With a Hi Ram?

By Mike Petralia

Note that the power for T42 does not begin until 3,600 rpm. That's due to the fact that dynos load engines differently than cars do. Instead of accelerating up through the rpm band from right off idle like a car would, a dyno must first let the engine accelerate past the point of its lowest test rpm, which we've always set at 2,500 rpm for DM. Once past the starting point, the dyno actually loads its water brake harder in order to pull the engine rpm back down below its starting point an then the dyno releases the engine to accelerate up through the rpm band after the operator gives the command.

It's like trying to climb a hill at WOT, but that hill keeps getting steeper and steeper, so much so that your engine won't move the car anymore and the engine just gets bogged down! It's hard to explain, but keep in mind that with 1,300 cfm of carburetor sitting on top of the manifold, the engine does not meter fuel that well when loaded so heavily like this either. So sometimes the dyno does not act like a car. But, if this engine were in a car, we're sure that it would be able to accelerate strongly from well below 2,500 rpm.

Danger Mouse specs for Part 24 - Test 40:
*Previous test from last month 355 cid, 12.5:1 cr, 4.030-bore 4-bolt Motown block, 3.48-stroke Lunati crank, 5.7-inch Lunati rods, Lunati domed forged pistons, Total Seal ductile iron Gapless top rings, Edelbrock Victor Jr. heads (64cc chambers, 215cc runners, 2.08" intake valves, 1.60" exhaust valves), Edelbrock Super Victor intake manifold, COMP Cams XR286R solid roller camshaft installed @ 105 intake CL (248/254 @ .050, 286/292 adv, .606/.612 lift w/ COMP 1.6:1 rockers, 110 LS), Carb Shop modified Holley HP950, 35 degrees ignition advance starting at 2,400 rpm, ramping up to 38 total at 5,500 rpm, 91-octane

Danger Mouse specs for Part 25 - Test 42:
Same as above but with Weiand PN 1984 Hi Ram and twin Holley HP650 carbs, 91-octane

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 40   T42   T40 vs. T42
RPM TQ HP TQ HP TQ HP
3600 407 279 428 293 +21 +14
3800 414 300 439 318 +25 +18
4000 427 326 459 350 +32 +24
4200 437 350 468 374 +31 +24
4400 439 368 463 388 +24 +20
4600 444 389 465 407 +21 +18
4800 453 414 470 430 +17 +16
5000 458 436 475 452 +17 +16
5200 458 453 479 474 +21 +21
5400 457 470 481 495 +24 +25
5600 454 484 477 509 +23 +25
5800 448 495 469 518 +21 +23
6000 444 507 460 526 +16 +19
6200 440 520 450 531 +10 +11
6400 433 528 436 531 +3 +3
6600 423 532 421 529 -2 -3
6800 411 532 407 527 -4 -5
7000 392 523 395 526 +3 +3
Max 458 533 481 531 +32 +25
Avg 425 392 452 454 +17 +15
SOURCES
Autotronic Controls Corp. (MSD Ignition)
1490 Henry Brennan Dr.
El Paso
TX  79936
Royal Purple
Bill Mitchell Hardcore Racing Products
51 Trade Zone Ct
Source for World Products
Ronkonkoma
NY  11779
Speed-O-Motive
131 W. Lang Ave.
West Covina
CA  91790
6-26/-869-0270
speedomotive.com
COMP Cams Total seal, dept. Sc
11202 N. 24th Ave
Suite 101
Phoenix
AZ  85029
Edelbrock
Dept. 5.0
2700 California St.
Torrance
CA  90503
310-781-2222
www.edelbrock.com
Vrbancic Brothers Racing
1463 E. Philadelphia
Ontario
CA  91761
909-930-9980
Fel-Pro
26555 Northwestern Hwy.
Southfield
MI  48033
Weiand (A division of Holley Performance Products)
1801 Russellville Rd.
Bowling Green
KY  42102-7360
Holley Performance Products
1801 Russellville Rd.
Bowling Green, KY 42101
KY  42101
270-782-2900
www.holley.com
By Mike Petralia
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