Diesel starting after storage?

[TUT]

After a year in storage how’s best to start a Fiat Ducati 2.3, considering the Oil which was new just before storage has drained to the bottom of the engine?

 

[Coolcats]

The pump generates zero pressure. Pressure is generated by restriction of its outlet by the interface between oil drillings and bearings. Provided that pump throughput exceeds the ability of the bearings to leak oil then pressure is generated. As bearing clearances increase due to wear oil dispersal from the bearings increases and less restriction is offered to the pump. Once the pump excess flow is used up the pressure will drop.

Just edited this post, a pump is not a pump without an outlet!

 

[tonyidle]

What? With respect you cannot have zero pressure on the outlet of a pump, I’m sure that is a typo.

You certainly can. If there's no restriction on the outlet it simply moves the liquid. Or in simple terms if you have a pipe on the inlet full of liquid and a pipe with a pressure gauge teed into it on the outlet do you think you'd read pressure when the pump was started?

If you connect the pressure gauge to the outlet with nowhere for the liquid to go other than against the gauge you'll read whatever pressure the pump is capable of generating.

 

[Coolcats]

You certainly can. If there's no restriction on the outlet it simply moves the liquid. Or in simple terms if you have a pipe on the inlet full of liquid and a pipe with a pressure gauge teed into it on the outlet do you think you'd read pressure when the pump was started?

If you connect the pressure gauge to the outlet with nowhere for the liquid to go other than against the gauge you'll read whatever pressure the pump is capable of generating.

If the pump moves the liquid from a-b there is force involved Which could be measured doesn’t matter how big the outlet is

 

[tonyidle]

If the pump moves the liquid from a-b there is force involved Which could be measured doesn’t matter how big the outlet is

Of course. No pressure is involved though. Power is input to the pump and, assuming 100% pump efficiency, is available to be taken from the liquid as it leaves the outlet. Don't take any power, no pressure is developed. Some power is absorbed by pump and pipe friction and pump and motor inefficiencies but pressure isn't developed until something tries to slow the flow out of the pump.

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[John Barrett]

If the pump moves the liquid from a-b there is force involved Which could be measured doesn’t matter how big the outlet is

Just edited this post, a pump is not a pump without an outlet!

Any fluid under pressure leaves an orifice at atmospheric pressure. Simple physics for those who know...

 

[jockaneezer]

Here's a pic of the shock absorber piston and rod off our old Isuzu, the rubber piston seal came apart and blocked the oil passages in the piston head, the shock went rock solid and sheared its top mount off the chassis rail due to the oil having nowhere to go !

We used to have two hydrostatic linear bearings on the rams of presses at work, they ran at 1500psi, with a clearance of 3 thou on a 2 1/2" ram. The oil had to pass through a 15 thou jet first. They never really wore out unless there were oil supply problems. These were replaced by one longer, nylon type sleeve with 1 1/2 thou clearance that was lubricated with a low pressure coolant, they were a pain in the proverbial.

 

[Coolcats]

Of course. No pressure is involved though. Power is input to the pump and, assuming 100% pump efficiency, is available to be taken from the liquid as it leaves the outlet. Don't take any power, no pressure is developed. Some power is absorbed by pump and pipe friction and pump and motor inefficiencies but pressure isn't developed until something tries to slow the flow out of the pump.

Agreed, when fluid pushes against something there is pressure

 

[Coolcats]

Here's the original patent with drawings. Very interesting!

US2563194A - Liquid spring resilient unit - Google Patents

Like it, it is a nice reference, the forces are high for that to be useful but I suspect that the forces that can be generated within a braking system are fare less than that required to compress a liquid.

 

[L' Hobo]

A liquid of any sort is effectively non-compressible. The reason brakes become spongy when the fluid is contaminated with water is that the mixture has a much lower boiling point than pure brake fluid. It's the vapour produced by the mixture when heated by the pads / shoes that makes the pedal go soft. When cold the brakes will operate normally with only water as an hydraulic fluid.

You are, of course, CORRECT! Sorry had a senior moment, as I said, I am VERY old .

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[RobL]

After a year in storage how’s best to start a Fiat Ducati 2.3, considering the Oil which was new just before storage has drained to the bottom of the engine?

Turn the ignition key??

 

[tonyidle]

I am VERY old

You certainly don't look it ?.

 

[L' Hobo]

Turn the ignition key??

I'm glad you included the question marks. After a year in storage, anything could have made its home under the bonnet so, at least, give that a quick check.

 

[L' Hobo]

You certainly don't look it ?.

PM me your address, I think you need my specs more than me, but thanks for the complement ?‍