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Hooked up a motor and with the amp draw and voltage with assumed 80%EFF at a 0.8PF my dyno has 0.25hp losses at 860rpm. As I understand it inertia increases by velocity squared. 3x velocity = 9x hp loss. Therefore 0.75hp lost in spinning the drivetrain on my dyno. That helps the numbers some

Thinking of connecting an electric motor to measure drag in amps increase and see where that gets me

Getting 1.5hp for Husky 51 3.2hp for the 372xp FT 5.33hp for the ms660 FT Need more sturdy brake for the 660

Mounted and cal check with 6 pounds at 24” after torque arm and cal rod balanced out.

Red will do that tomorrow. Was excited to see the big gauge reading so nice!

New gauge air purged out with 15 pounds weight as per my shipping scale

Thinking on this stuff, Red would your setup provide Uncorrected numbers as in raw torque and rpm?

Nice gauge

A buddy just delivered a properly calibrated large scale pressure gauge. Also will upgrade the force sensor mounting for near frictionless action. Torque arm and caliper were made in such a way that they are balanced and bearing mounted. I will check calibration with a known weight Also recheck...

Nutball,I am using the dyno rpm and torque to get hp Is that not correct? 7.5 pounds torque at 2000 rpm = 2.85hp

Red, I have a 12” torque arm pressing on a hydraulic cylinder of my making such that 20 pounds reads 2000kpa. For rpm I use a mag pickup sensing the four bolt heads in sprocket into a tach adapter to drive the auto tach. Gearing at 4:1

What an impressive thread! Found this searching for dyno numbers. I have built a disk brake dyno and playing with a 372xp kit saw for testing dyno. I can only get 2.85hp out of it so far. My question is for Red as I see the graphs have corr torque and hp trends. Is that ‘corrected’ numbers and...

How do you mean Stihl style wears less?

Sounds good. Husky style rocks imo

Lightning, would you mind detailing how you modded your oiler and what the stroke length gain is? TIA

Metal drive vs plastic? I thought they all were plastic drive gears? Is there such a thing as a drive gear that is a multi start thread? That would spin the pump faster for more oiling.

Pulled the pump on my 181se. Now that is one fine pump! Drive gear is 22 teeth so pumps slower but the piston is 0.255” diameter and max stroke is 0.075”. This saw was set on number 2 setting which allows about 50% stroke. Running a 24” bar so will see how it oils when it sees some wood.

Do the 372 and 390 Husky use the same oiler?

Crank worms are all one to one I will check that ipl out. I just posted my measurements Cheers Edit, checked ipl and oiler is rated at 5 to 15cc at 10,000rpm. Doing the math with what I measured I get 16cc delivery. Not too bad

Have a Husky 372xp oiler and a Stihl 660 oiler here. Both pistons are 0.235" diameter and both at max stroke on adjuster allow 0.025" of stroke. The Husky pump gear has 13 teeth and the Stihl has 11. So for the same saw rpm the stihl will pump more oil as found. The Husky design is flat out...