Dyno Day RESULTS!

[Zoom This]

Rich.... you are way lean past 4000 rpm. The A/F should stay around a good median of 12.5:1 to make safe power. I have no idea how Shelby made that kind of power numbers if the A/F ratio is true and accurate. HP looks very good and what I would expect, depending on cam specs, CR etc.

[Zoom This]

Chris. I didn't have my motor on an engine dyno, just Dyno Sim software prediction. Both Hot Rod mag and Popular Hotrodding and Horsepower TV did comparos between the Dyno Sim software and actual engine dyno results on the same motor. +- 1-2% was the error factor. My engine builder used this to predict 560 hp at 6k and 564 torque at 4500 rpm. Yah, 20% is about right. 15% for drivetrain losses and 5% for the sidepipes. Total of 20% parasitic loss.

[CJ428CJ]

I put together a little table to compare the results I got off of the chassis dyno vs what DynoSim predicted for my 428. Roughly an 18% loss on average. Columns left to right are RPM, chassis dyno RWHP, DynoSim RWHP, % loss, chassis dyno torque, DynoSim torque, % loss.


2000 108 179 40% 283 470 40%
2500 172 223 23% 362 469 23%
3000 230 268 14% 402 469 14%
3500 276 333 17% 414 500 17%
4000 318 386 18% 418 507 18%
4500 350 427 18% 408 498 18%
5000 368 454 19% 385 477 19%
5500 372 461 19% 356 440 19%

[RallySnake]

Greg,

This is very interesting information. Can you tell us any more about the 417 engine that set the high number?

Paul

[Dennis Kelley]

Very good numbers for those "Little" windsors. I knew I should have built a stroker.

later

dennis

[Zoom This]

Paul...that was my car with a 418W stroker, built by Neil Ruegsegger in Danville, CA. The motor has Edelbrock Vic Jr heads and intake, ported, polished, port and gasket matched and flowed on Neil's flow bench. CR is 10.83:1, Holley 850 modified by Jet Performance. Cam is a hydraulic roller with Crane shaft mounted roller rockers. .565 lift on intake at 232 duration and .552 on the exhaust at 242 duration on 110 degree lobe centers. Heads were flowed to 303 cfm at .550 intake valve lift for maximum velocity and cfm.

Other than that, the rest of the horsepower came from Neil's drive for perfection during design, machine work, perfect balancing of all the rotating assembly, flywheel and clutch included, not to mention his assembly procedures. No stone left unturned with Neil. By the way, the motor was still making HP at 6k rpm, but since it only has 400 miles on it, we errored on the side of safety here and waved the motor off at 6k.
Bill

[cobrasnake]

Bill and Neal have done wonders with his car. Attached are photos of Bill's car with Ted the tuner at the wheel and Bill checking out details (in one of them). Be sure to note how the car glistens - it looks as clean as it sounds!

Sorry for the delay in posting - still trying to figure this digital picture thing out.

TB

[Tom Howland]

Chris, Thats a great table. It's good to see all the info in one place.

[RallySnake]

Bill,

Thanks for the story. That's very inspiring!

Paul

[badrich]

Greg: I too was curious just what a Lambda sensor was. Google this for much more detail. Web definitions for Lambda sensor:
An oxygen sensor is an electronic device that measures the proportion of oxygen in the gas being analyzed. The sensing element is usually made with a zirconium ceramic bulb coated on both sides with a thin layer of platinum and comes in both heated and unheated forms. The most common application is to measure the performance of internal combustion engines in automobiles and other vehicles. Divers also use a similar device to measure the level of oxygen they are breathing.
en.wikipedia.org/wiki/Lambda_sensor - Definition in context

I too am interested in beng a part owner of an LM-1 meter. Rich