please pass?

[jaberwocky]

i recall seeing cars driving about with the sticker ''running in,please pass''.something to do with the new engine but what exactly?thanks

[rojam]

If a car is new or has a new engine fitted, you should not rev it too much until the engine had been run for maybe one or two thousand miles.
The engine components in contact with one another (bearing surfaces, pistons) must be �run in� after assembly in a new engine.
If you thrash a new engine it won't last as long as one that has been carefully run in.

[jaberwocky]

thanks.didn't think things would still be same,technology etc.obviously just dont have the stickers anymore!!

[NORMANTHEDOG]

no,your right,its a thing of the past as most engines are now already run in,when they leave the factory.

[DGR]

It was also a courtesy to indicate that you were force to drive gently and invite someone to pass. A courtesy that is also perhaps a thing of the past!

[jaberwocky]

dgr-are there any courteous people left in this lousy country? i blame everything on BLAIR!

[chevrolet1.8]

older cars sometimes having a replacement engine fitted displayed the ' please pass' sign as a courtessy to other motorists. due to technology now this is rarely the case. it might be a classic car owner that would display it having had an engine rebuild.

[WoWo]

It's still the norm on performance motorcycles, but having said that the last one I had new could do over the speed limit without going past the recommended rev limits.

[Panic Button]

Bit of a pointless sign nowadays. Its not the speed you should keep low when running in, its stress on the engine by labouring or over revving

[Cockney_si]

When you see the new cars being driven onto and off the ferries then you would frown at the 'running in' period.