i was going through one of my old text books
"automotive mechanics" and came across this
for running in an engine
"Do not allow the engine to idle on first start up after assembly.
Accelerate it immediately to a speed comparable to a road speed ofnot less than 40km/h and maintain this speed until the engine temperature reaches approximately 80oC.
It is a bad practice to allow the engine to idle slowly during the first warm up period immediately following the assembly of the engine. At idle speeds there is insufficient oil thrown onto the rings, pistons and cylinder walls to adequately lubricate them duriing the engine running in period.
The recommended engine speed will ensure sufficient lubrication to prevent ring scuffing during this critical period.
Whenn the engine is properly warmed
Accelerate the car on the road several times in top gear at full throttle from 40 - 50 km/h.
This procedure allows full gas pressure to build up behind the top ring and thus provide sufficient load to cause rapid seating of the rings on the cylinder walls.
The chrome compression ring responds particulary well to this quick seating treatment and the chrome surface provides added assurance against any initial scuffing.
Driving procedure during first 300kms
1.Avoid full throttle operation in top gear at low speeds in order to prevent overloading of the rings and
2.avoid prolonged top speed operation to prevent damage to the rings by overheating.
for best results drive normally, but not at speeds in xsess of 60% of top speed during the first 300kms.
Ive put this up for anyone thats interested.
