18 replies to this topic

[MRA]

Hi Mini13,

I am not sure which part of my statement that you do not understand ?, I have read it again and it makes perfect sense to me ! Have I made a grammatical mistake ?

How would the crank hit a substantial amount of stationary oil ?

I thought you were an engineer?

think about what will happen if a crank hits a substantial amount of stationary oil at high rpm....

maybe you should stay away from all engines.

Well I tend to stay away from inline A series

However there will be oil "leaking" out past the bearing shells, and the crankshaft will mostly turn this into mist which will lubricate other parts of the engine, but also help to cool the internals

Ok, what are the benefits of fitting a windage tray if not to reduce absorbed BHP ? and if so what absorbs this BHP ? simple it is the oil and the pumping effect of the crankshaft against this oil... now while most of you will never need this extra oil around pistons for instance..... and your gudgeon pin / small end of a conrod gets its oil from where exactly ????

Ask any owner of a mega high BHP turbo engine how they keep their pistons cool ? most if not all will tell you that they use forced oil aimed under the piston crown...... this is NOT a standard A series item and must be added.... up till that point they are splash fed by oil being splashed up under the piston crown.

So the splashing of oil around the engine helps to remove excess heat and lubricate the piston gudgeon pin within the piston or conrod whichever you have.

[Sprocket]

I think that you will find that the crank in an inline sits partly in oil

[Paul Wiginton]

Cross drilled cams have been around for a long time, usually made by Piper. Mine is a Kent 310sp profile on a Piper cross drilled billet. It takes oil from the cam bearings and centrifugal force pushes it out of the lobes so there can be no possibility of oil starvation.
Ive not had any need to up my oil flow, as I said earlier the pressure is a bit high if anything. I rev this engine to 9,500rpm regularly and with a windage tray there is no lack of oil.
Ive run non cross drilled cams with windage trays before and there was no oil starvation issues but a cross drilled cam is no more expensive than a normal billet cam.

Under crown cooling jets on turbos are for cooling, not lubrication, they have proved to not be necessary but if you are spending time and money on a block then they are an easy way of getting some peace of mind.

Paul

[mini13]

what sproket said....

if you are an engineer, as i was under the impression you are from other posts in the past then you would know the crank cant sit in the oil.

this really is basic stuff.