Originally Posted By: neo3
Originally Posted By: Thermo1223
Cranking to try and "prelube" it is such a horrible idea.
You have minimal oil pressure when cranking so all you are doing is increasing wear on the bearings. We are about decreasing startup wear not adding to it.
There is NO benefit to doing that and a lot of harm I can see.
I completely disagree. It's not about pressure, it's about volume, which is a function of number of revolutions of the pump regardless of rpm. You want all the oil passages to fill up before the pistons start smashing down against one side of the crank bearings. Also you want the initial revs without a good oil film to be slower, since heat/wear is a function of the speed of surfaces sliding against each other, and the number of revs without a good oil film will be the same regardless of whether it's being turned by the starter or turned by the pistons firing.
It's all about pressure...volume only comes in play when you want talk about heat removal. Without proper flow(volume) you can't carry heat away from certain areas fast enough. A cold & dry start relies only on the film lube left from the last running. Without adequate pressure you will have metal to metal contact even at idle. You talk as is these passages take seconds to fill. It is a closed system once the pump is at speed the first bits to get oil are the crank & rod bearings, then then the camshaft on top. The pump is specific in it's output but also at a certain RPM, it certainly is not cranking speed.
Now using a pressuried pre-lube in the form of stored oil under pressure is a good idea but not needlessly cranking on dry motor not started for 7 months. You start it and let it idle normally under pressure after a few mins making sure it is running fine drive it.
