Originally Posted By madscientist
Originally Posted By Monte_Smith
As Andy is saying, just because dyno numbers differ, does NOT mean anybody is lying. Things are NOT exact, don't care what some care to preach. I dyno most motors, NOT in an attempt to wear it out on the dyno and have a cool sheet to show people, but for the purpose of making sure it is sealed up, the carb is right and it shows to make about the power it SHOULD, based on the parts.

I built a 632 for a guy a few years ago, it made X power on a certain dyno. The next year after a freshen, we ran it on a different dyno. It was down 80hp and he was concerned. I pointed out that it burned the SAME amount of fuel, at the same air fuel ratio on both dynos, so regardless of what the sheet says, it makes the same power it did. One was a properly calibrated Stuska, the other a properly calibrated Super Flow


So which one was correct. Only one of the HP numbers can be correct. Or, I guess both could be wrong. How would you know, other than time slips?


I get it that there are variables, and that would account for SLIGHT differences in outcomes. But to try to get me to believe that one guy loses 80 HP and that's NOT an issue...well, you won't.
What do you want me to say. They were not my dynos, or in my shop, nor did I calibrate them. Would you not agree, that if the motor burned the same amount of fuel, at the same A/F and it moved the same amount of air.......that it made the same amount of power, even though two dynos read different power numbers? All I know is that even with a dyno sheet that said the motor was 80hp down, the car ran the same as it always did. I didn't dyno it after the freshen in an attempt to make more power. Just to break it in, make sure it was sealed up and everything was OK. After the first power pull, I to was concerned about the loss of power, but after looking at the fuel flow numbers, I knew the motor was fine