Re: Re: Re: Correct dyno operation

Posted by JHEnt on July 01, 2001 at 17:34:32 from (216.138.56.171):

In Reply to: Re: Re: Correct dyno operation posted by JS on July 01, 2001 at 06:25:47:

I wouldn't worry about trying to read peak HP. It is very easy for someone aggressively trying to get the needle into a bounce. This will show much higher in a spike than the point at which the engine would simply die. Basically the max or peak HP reading will not mean anything to you anyway. At that point the engine could not do any more and running a real load at that point will eventually damage something. Also many uses of the pto are more rpm senitive. Meaning pulling the tractor down to 300 rpm will not run the machine at the correct speed.

In order to read PTO HP of a tractor:
-Warm both the tractor and dyno to operating temps with a light applied load. Fully loading a cold engine is a sure way to get a leaking head gasket.
-Open the throttle to full position.
-Apply a load slowly untill the dyno's tachometer reads the rated rpm for that hp scale. Usually 540, 1000, and 600.
-Run at this point for 15 minutes watching the engine temp so as not to overheat the tractor.
-You will ususally be able to gain a couple of hp on the scale after it has run for some minutes.
-With the dyno's tachomer on the proper rpm read the hp of the appropriate scale. This is the pto hp of the tractor and is usually the maxium usable hp. Although you can drag the engine down further you will reach a point where any unknown load in use will kill the engine.

In order to read the hp at anything other than the rpm's listed on the dyno's guage requires a conversion chart supplied by the dyno's manufacturer. Those scales on the dyno's guage are calibrated for that rpm only and are not accurate for any other rpm.

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