08-29-2014, 02:26 AM
(08-29-2014, 01:55 AM)the_undecider_imp Wrote:(08-28-2014, 11:16 PM)kDiqq_imp Wrote:(08-28-2014, 10:10 PM)Lord Popgun_imp Wrote: Can one of you guys explain just what piston slap is and what it sounds like and any bad things it does? Thanks. I gots to know
I'd be happy to! The best example I know of it is in aluminum motors. Specifically GM aluminum motors. To be out simpky, the piston at any given moment is too small or the bore too large and the sides of the piston are knocking against the bore. Since the rings have room to expand, a compression loss is not experienced. Usually this occurs because the pistons and sleeve are made of different materials and these materials have different coefficients of thermal expansion. So, in the case of steel sleeved, aluminum motors, the bores will 'open up' when it's cold and as it warms up, the block will expand just enough to bring that gap closed enough to stop the slapping. Sounds awful, but typically doesn't do any damage.
Sent from my Z30 using Tapatalk
I'd be happy to! The best example I know of it is in aluminum motors. Specifically GM aluminum motors. To be out simpky, the piston at any given moment is too small or the bore too large and the sides of the piston are knocking against the bore. Since the rings have room to expand, a compression loss is not experienced. Usually this occurs because the pistons and sleeve are made of different materials and these materials have different coefficients of thermal expansion. So, in the case of steel sleeved, aluminum motors, the bores will 'open up' when it's cold and as it warms up, the block will expand just enough to bring that gap closed enough to stop the slapping. Sounds awful, but typically doesn't do any damage.
Sent from my Z30 using Tapatalk
The early GM 5.3 and 4.8 motors were bad about this. My 2000 Silverado 5.3 has it. On a cold morning, it'll clatter about 45 seconds and quiet down.
My 13 CB was clattering to my alarm, so I am glad I found this thread. I adjusted the backlash per the manual and she quieted down considerably.
By "manual", do you mean shop manual? I checked my owners manual supplied with the bike, and can't find anything about this adjustment.
Indeed no mention of the balancer at all, even in the maintenance schedule. That seems odd to me... I don't have any of the symptoms, but it would have been nice for Honda to tell owners how to do it should the need arise. I guess they expect it to be set right at the factory, and should never need service?