Correct me If I'm wrong.... Small utility engines should be operated at rated speed for best lubrication and longevity
Last edited by a moderator:
proper rpm for small OPE application
- Thread starter faltic
- Start date
Just bench racing never seen a study.
Not putt putt, but 1000 below or up against the limiter to get good carburetion form those simple carbs.
Now, depends on the overall load, or if the engine is undersized.
Generally a Lower engine speed without lugging = less wear.
Remember 1200 rpm is ten power strokes per second in a 4 banger. That piston is moving and floated. So is the rod.
Not putt putt, but 1000 below or up against the limiter to get good carburetion form those simple carbs.
Now, depends on the overall load, or if the engine is undersized.
Generally a Lower engine speed without lugging = less wear.
Remember 1200 rpm is ten power strokes per second in a 4 banger. That piston is moving and floated. So is the rod.
Depends on the application. Most small engines have a throttle on them.
I've always been "told" that with 2 cycle engines it was best while under load, to run them at full throttle. Don't be running your weed trimmer at half throttle while trimming. The caveat to this is it is bad to run your chainsaw at full throttle while NOT under load (stress to engine components).
dnewton3
Staff member
2 stroke engines generally run cleanest when at WOT, regardless of load. Best to let them warm up and cool down at idle for a few minutes before hitting the WOT. Premix makes sure the oil is at a proper ratio, but it's a compromise; one ratio for many loads.
4 stroke OPE engines can run well at most any rpm in their range, depending upon load. I don't think their lubrication is as finicky. Many folks don't realize that splash lubrication generally is a means to pick up the oil and throw it into the crankcase air volume. The (near violent) pumping action of the piston pushing air around inside the crankcase creates a mist of the oil and moves it around to all the surfaces.
4 stroke OPE engines can run well at most any rpm in their range, depending upon load. I don't think their lubrication is as finicky. Many folks don't realize that splash lubrication generally is a means to pick up the oil and throw it into the crankcase air volume. The (near violent) pumping action of the piston pushing air around inside the crankcase creates a mist of the oil and moves it around to all the surfaces.
Similar threads
