Valve Guide lubrication (rate) 5

[477stephen]

Hi there
Has anyone else noticed the decline of the "internet"?

Cant seem to find any information on it these days

I have an older engine Single cylinder British bike. I have a high rate of valve guide wear. Due to inadequate oil supply ( 25cc at 3000 rpm ON a good day ) so I needed to know what would be an acceptable oil flow the only reference I can find says about "Normal values lie in a range of from 0.007 to 0.1 cm 3 /10 h" ( 3 x 10^-6 cm~3/secomd?)
Does anyone have any information on Valve guide lubrication rates?

I really appreciate any help you can provide.

Stephen

 

[Aes India]

Understanding Valve Guide Lubrication Rates
To address your concern regarding valve guide lubrication rates for your older single-cylinder British bike, we need to first understand the mechanics of valve guides and their lubrication requirements.
1. Function of Valve Guides
Valve guides are critical components in an internal combustion engine. They serve to align the valves with the cylinder head and provide a surface for the valve stems to slide against as they open and close. Proper lubrication is essential to minimize wear on both the valve stems and the guides themselves

2. Importance of Oil Flow
Oil flow to the valve guides is crucial for reducing friction and wear. Insufficient oil supply can lead to increased wear rates, which you have already observed in your bike. The reference you found indicates that normal values for oil flow can range from 0.007 to 0.1 cm³ per 10 hours, which translates into a very low rate of lubrication.

Note- afeter calculation oil flow rates for valve guide lubrication fall between approximately
1.94
×
10
−
8
and
2.78
×
10
−
7
cm³/s.
3.Recommendations for Improvement
[li]Given that you are experiencing high rates of valve guide wear due to inadequate oil supply:[/li]
[li]Consider using an oil with appropriate viscosity that meets or exceeds manufacturer specifications.[/li]
[li]Inspect the oil pump and its components to ensure they are functioning correctly.[/li]
[li]Evaluate any potential blockages in the oil passages leading to the valve guides.[/li]
[li]Regularly check and maintain proper oil levels in your engine.[/li]
[li]By ensuring adequate lubrication through these methods, you should be able to mitigate excessive wear on your valve guides.

https://www.aesindia.co.in/

 

[477stephen]

Quote" Note- afeter calculation oil flow rates for valve guide lubrication fall between approximately
1.94 10−8
and
2.78×10−7 cm³/s.
3.Recommendations for Improvement
Given that you are experiencing high rates of valve guide wear due to inadequate oil supply:
Consider using an oil with appropriate viscosity that meets or exceeds manufacturer specifications.
Inspect the oil pump and its components to ensure they are functioning correctly.
Evaluate any potential blockages in the oil passages leading to the valve guides.
Regularly check and maintain proper oil levels in your engine.

[li]By ensuring adequate lubrication through these methods, you should be able to mitigate excessive wear on your valve guides.

Thank you that's exactly What I have done

I can actually hear the difference. So when the cylinder head comes off next ( valve seats ) I will install new guides ( mag/alum bronze its what is on the market )

Where or how did you get the figure of 2.78 x 10-7 cm~3/ sec if I may ask

Kind Regards Stephen

P.s your Company Aes is just down the road from me here in Japan

 

[MintJulep]

@477stephen

I hadn't noticed that you're in Japan. Me too.

 

[477stephen]

@mintJulep

They say the heat has gone but I disagree ! this summer has been horrible

Im at Kawagoe for the motocross that will be fun!

Stephen

 

[mfgenggear]

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+7
The Society of Automotive Engineers (SAE) measures engine oil flow using a viscometer device that measures how long it takes oil to flow at a specific temperature:

Cold temperature viscosity
The first number in an SAE oil rating, before the letter "W", indicates how the oil flows when it's cold, such as when the engine starts. The lower the number, the faster the oil flows.

Operating temperature viscosity
The second number in an SAE oil rating indicates how the oil flows at normal engine operating temperatures. The higher the number, the less the oil will thin out as it heats up.

Measurement temperature
The viscosity is typically measured at either 40°C (100°F) or 100°C (212°F). 100°C is often used for engine oils because it reduces interference from soot contamination.

Viscosity measurement
The elapsed time in seconds is converted to centistokes (cSt).


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A viscometer is used to determine the viscosity of engine oil. Higher viscosity numbers indicate thicker oils because they take longer to flow through the viscometer when tested.

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[mfgenggear]

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+7
In a four-stroke engine, oil flow is achieved through a combination of splash lubrication and pressurized lubrication:
Splash lubrication
The crankshaft is partially submerged in the oil sump, and the rotating crankshaft splashes oil onto other engine parts.
Pressurized lubrication
An oil pump delivers oil to the engine's moving parts, such as the main bearings, rod bearings, and cam bearings. The oil pump also supplies oil to the engine's valve guides and rocker arms.

The oil's functions include:

Lubrication: Oil lubricates the moving parts of the engine.

Heat dissipation: Oil disperses heat generated by the engine's components.

Impurity removal: Oil removes impurities from the engine.

Oil pressure is created by restrictions in the outlet line of the pump, such as the big end and main bearings, and the camshaft and rocker gear.



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