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Title: Why is it bad to lug an engine? Post by: leonardc9 on June 01, 2008, 09:03:50 PM I've always been told it's bad to lug an engine. On the other hand, I've been told with my car that it is most efficient at low RPMs with max torque (for example, 6th gear going uphill vs. 4th gear). My car can do this smoothly but my monster engine isn't happy below 3K RPM. Other than potential stalling though, why is lugging an engine considered bad? Or is it an issue specific to Monster engines?
Thanks, Leonard Title: Re: Why is it bad to lug an engine? Post by: ROBsS4R on June 01, 2008, 09:24:08 PM People always told me it puts more strain on the engine components. I have no idea if that is true or not. ??? I can't really ride my S4R lugging it so I guess I don't need to worry about that ;D Title: Re: Why is it bad to lug an engine? Post by: He Man on June 01, 2008, 09:43:02 PM i heard your engine is working harder to move the pistons and it ends up dragging on the walls of. 14T or +2 rear = no more lugging at low gear!
Title: Re: Why is it bad to lug an engine? Post by: swerdna on June 02, 2008, 01:20:03 AM Lugging causes extreme stress between the rear thrust faces of each piston and the cylinder walls. Small bits of piston skirt can break away causing the rear surface to scuff. The best prevention for lugging an engine (either old or new) is to downshift to a lower gear where the engine runs more freely, and the transmission assists the engine in delivering peak power to the rear wheel.
Source (http://www.steelthundercc.com/enginebreakin.html) Title: Re: Why is it bad to lug an engine? Post by: hypurone on June 02, 2008, 05:42:02 AM Lugging causes extreme stress between the rear thrust faces of each piston and the cylinder walls. Small bits of piston skirt can break away causing the rear surface to scuff. The best prevention for lugging an engine (either old or new) is to downshift to a lower gear where the engine runs more freely, and the transmission assists the engine in delivering peak power to the rear wheel. Source (http://www.steelthundercc.com/enginebreakin.html) 'nuff said... [moto] Title: Re: Why is it bad to lug an engine? Post by: abby normal on June 02, 2008, 05:44:38 AM plain bearings need lots of relative speed (rpm) to develop pressure to support the piston loads.
do the math and you'll see that oil pressure as supplied by the pump is insufficient ... the real pressure comes from the shear which, effectively, jams the oil into the narrow gap. slow the engine too much and rotating parts will come into contact. Title: Re: Why is it bad to lug an engine? Post by: leonardc9 on June 03, 2008, 01:14:42 AM plain bearings need lots of relative speed (rpm) to develop pressure to support the piston loads. do the math and you'll see that oil pressure as supplied by the pump is insufficient ... the real pressure comes from the shear which, effectively, jams the oil into the narrow gap. slow the engine too much and rotating parts will come into contact. Thanks guys -- this is useful. I assume this would cause jerking then in both my car and motorcycle engine? |