We made 3 pulls with my truck tonight. I was arguing with the dyno operator on how high to rev my truck up. He wanted to take it to 5500 max but I was like no, it needs to go up to 6500 for sure.
So on the first pull he stopped at 5700 rpms. It was still climbing but only gave a reading of 276.4 and torque peaked at 253.4 ft lbs @ 5500 rpms. A/F ranged from 11.8-12.4 throughout the run.
On the second pull, it was a back to back pull, it was running a little warmer than normal. He only pushed it to 6100 on this pull and it made 260.3 and was still climbing when he backed off. Torque was 235.5 @ 5700 rpms. The A/F was between 11.9-12.6.
The third pull, we turned the timing down from 36 to 32 and let it cool back down to 180 degrees. It made 252 hp @ 6000 and 219 ft lbs @ 5800 rpms. The A/F was from 12.1-12.6.
They put a couple hundred pounds of weight in the back of the truck but it was still spinning the tires on the rollers. He told me that he doesn't spin hyd tappet engines over 6,000 because they just collapse and lose power. I'm not so sure that these were the right results. He was even kinda confused about it.
BUT....Please watch the video and see how it put load on it. He didn't just stand on it, he would slowly bring the power up, hold it, then bring it up some more, and hold it, then bring it up the final time. He was doing it in like 10 mph increments or something. I might check into another local dyno and see if I can get one pull from them just to see.
They third dyno run: http://www.supermotors.org/vehicles/....php?id=237210
1982 F100 2wd-408c CHI 3V 225cc Heads, 3v Intake, Pro Systems 1000+HP carb, firstname.lastname@example.org w/ 0.694/0.697" lift solid roller, JPT Rollerized c6 and 5000 rpm converter, 4.86 gears and S&W Ladder Bar kit with QA1's all the way around.
email@example.com mph 1/8 mile with lots of bounce - with old engine and suspension(should be greatly improved)
1982 F100 408c 3v