Preferred Dyno Pull RPM Range w/Data

[blykins]

I guess if "enough said" is code for "I have no real world experience and I have to rely on quotes and google images..." then I will agree.

Bottom line Al, is that it depends on the engine. I built a 408W a few months back (you can read about it in Modified Mustangs magazine) that was destined for a Ford F1 pickup. The owner was going to use it for his business, to pull a car hauler. It was designed with low SCR, very low DCR, tight piston clearances, TBEFI, and a slow ignition curve for this very reason. I wouldn't mind at all to pull it down to 2500.

With most of the engines that we have here on Club Cobra, with guys wanting 550-650 hp, compression ratios approaching 11:1, DCR's that are getting close to the limit of pump gas, quick advance curves, etc., I wouldn't chance it, and I've expressed my reasons why. That's where experience comes in, knowing and not knowing how each engine will behave.

As for Barry, I see a trend with his data. See if you can pick it out...

http://www.network54.com/Forum/74182...heads+on+a+482

http://www.survivalmotorsports.com/i...oller-_web.JPG

http://www.survivalmotorsports.com/i...o_-_052508.JPG

http://www.survivalmotorsports.com/i...o_-_043008.JPG

http://www.survivalmotorsports.com/i...yno_011209.jpg

http://www.survivalmotorsports.com/i...7_EFI_Dyno.jpg

http://www.survivalmotorsports.com/i...10_FE_Dyno.jpg




Now, I'll be fair and say that sometimes the dyno is the issue, but we can make yet another point here....the torque curve isn't going to change drastically enough to insist on the engine being pulled down to 2000-2500. The overall shape of the curve will stay true.