jon said: (quoted from post at 21:10:17 11/23/14) Just lost a sale on an 8n because he didn't think it would run a bush hog good enough with HP in the mid 20's. (I've read 25-27?) He said his lawn mower is 18 hp & it won't cut it.
How do you explain the apples to oranges scenario here?[/quote:3580303461]
Rotary Mower HP 101:
The lawn tractor spins the blades through either a direct or step up belt drive (3600+ blade RPM) which actually decreases the engine torque delivered to the mower blades. The tractor PTO and bush hog gear box is a speed reduction drive (540 blade RPM) which increases the torque delivered to the mower blades.
Delivering more torque to the mower means you can cut wider and/or heavier growth with the same HP/torque engine. Lower blade speed means a more ragged finish to the cut.
[quote:3580303461="Ken(Ark)"](quoted from post at 23:30:01 11/23/14) The 8n is rated @ 2000 rpm , if it were rated at 3600 rpm , with no muffler or air filter I would guess 45 hp would be close .
At 2000 rpm the 8n probably has 5 times the torque that a briggs has @ 3600 .
Pretty close. Here are the power and torque curves for the L-head. Maximum dynamometer HP is 42 BHP @3000 RPM. Maximum dynamometer torque is 90 lb-ft @ 1600 RPM.
TOH
This post was edited by TheOldHokie at 06:11:57 11/24/14 9 times.
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