Oil question

[Freeman]

Now I use SAE50 oil, but the oil pressure will be low when it is hot. Can I use SAE60 or 70 oil?

[Freeman]

Cold

[Freeman]

Three minutes.

[Freeman]

Ten minutes.

[T. Cotten]

Pressure means resistance, Freeman...

As the motor warms, there is less resistance, thus more flow.

Little pressure is required, but flow is vital.

Thicker oil adds resistance, but useful for hot weather or severe duty.

....Cotten

[Freeman]

Pressure means resistance, Freeman...

As the motor warms, there is less resistance, thus more flow.

Little pressure is required, but flow is vital.

Thicker oil adds resistance, but useful for hot weather or severe duty.

....Cotten

Hello, cotten. Now the problem is that the engine heat decay is very serious, the engine noise is very loud, after the heat. This engine is now running at 600 miles.

[T. Cotten]

Can you observe oil returning to the tank, Freeman?

If there is flow, then there is a different cause for over-heating.

....Cotten

[Freeman]

Can you observe oil returning to the tank, Freeman?

If there is flow, then there is a different cause for over-heating.

....Cotten

Yes, I can see it.Flowing

[ryan]

I run 60w in my 69 flh, but it never goes below 30psi hot.

[T. Cotten]

Since oil is flowing, Freeman,..

We should seek other likely causes for over-heating and noise; Is one cylinder noticeably hotter than the other? (Infra-red thermometers are fun.)

Valve train noise can occur with moderate heat. Please tell us if it has solid or hydraulic tappets?

I now see your gauge is installed in the overhead oiler screen gallery, instead of upon the pump itself. But even upon the pump, it only tells you when the motor is warm.

....Cotten

[Freeman]

Since oil is flowing, Freeman,..

We should seek other likely causes for over-heating and noise; Is one cylinder noticeably hotter than the other? (Infra-red thermometers are fun.)

Valve train noise can occur with moderate heat. Please tell us if it has solid or hydraulic tappets?

I now see your gauge is installed in the overhead oiler screen gallery, instead of upon the pump itself. But even upon the pump, it only tells you when the motor is warm.

....Cotten

solid tappets
Looks like I need to measure the temperature.
What is a reasonable temperature range?

[craig (DE)]

I run 60W in my 65 FLH and when hot at idle, very low pressure. I have good flow so I don't worry about the low pressure at idle.

[T. Cotten]

solid tappets
Looks like I need to measure the temperature.
What is a reasonable temperature range?

Beware of solid tappet replacement kits with aluminum pushrods, Freeman,...

Their thermal expansion is less than the cylinder, and will make noise if adjusted normally; They require to be as tight as possible without losing compression.

A quick search of "Harley-Davidson engine temperature chart" produces volumes of data. But even without a baseline, we can compare the motor to itself.

If one cylinder becomes hotter than the other quickly, it is certainly a clue.

....Cotten
PS: I took my pyrometer to the Davenport Meet to make comparisons, but everybody was riding golf carts.

[Freeman]

I run 60W in my 65 FLH and when hot at idle, very low pressure. I have good flow so I don't worry about the low pressure at idle.

My data needs to be checked again, thank you.

[Freeman]

Beware of solid tappet replacement kits with aluminum pushrods, Freeman,...

Their thermal expansion is less than the cylinder, and will make noise if adjusted normally; They require to be as tight as possible without losing compression.

A quick search of "Harley-Davidson engine temperature chart" produces volumes of data. But even without a baseline, we can compare the motor to itself.

If one cylinder becomes hotter than the other quickly, it is certainly a clue.

....Cotten
PS: I took my pyrometer to the Davenport Meet to make comparisons, but everybody was riding golf carts.

I see. I need a further examination. Thank you very much.