Thermal Expansion Coefficients
02-20-2019, 11:58 AM
#1
Thermal Expansion Coefficients
Hi,
does anybody know the Thermal Expansion Coefficients of the Cylinder Head and the Intake/Exhaust Valves?
I am considering using custom-made valve guides and I want to determine the correct dimensions.
Thank you for your help.
JagoBlitz
does anybody know the Thermal Expansion Coefficients of the Cylinder Head and the Intake/Exhaust Valves?
I am considering using custom-made valve guides and I want to determine the correct dimensions.
Thank you for your help.
JagoBlitz
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HawkeyeGeoff (05-06-2019)
05-05-2019, 07:56 PM
#4
Registered User
Send a sample to a materials lab and they can perform EDS on it and give you the exact composition of the alloy, maybe they even have a match in their library.
Or look in your textbook and take an average for 2011 through 7075 since they're all a few tenths apart from each other. The maximum delta is .08x10^-6/degC, in this order of magnitude you are not going to see an appreciable deformation regardless which value you use.
Or just eyeball the table and use 23.4x10^-6/degC.
For OEM valves you will have to perform EDS. Honda is on top of their materials game and their engineering team is annoyingly hardcore and meticulous, I highly doubt you will find accurate information of what exact alloy was used.
Or look in your textbook and take an average for 2011 through 7075 since they're all a few tenths apart from each other. The maximum delta is .08x10^-6/degC, in this order of magnitude you are not going to see an appreciable deformation regardless which value you use.
Or just eyeball the table and use 23.4x10^-6/degC.
For OEM valves you will have to perform EDS. Honda is on top of their materials game and their engineering team is annoyingly hardcore and meticulous, I highly doubt you will find accurate information of what exact alloy was used.
The following users liked this post:
HawkeyeGeoff (05-06-2019)
05-06-2019, 09:21 PM
#5
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Send a sample to a materials lab and they can perform EDS on it and give you the exact composition of the alloy, maybe they even have a match in their library.
Or look in your textbook and take an average for 2011 through 7075 since they're all a few tenths apart from each other. The maximum delta is .08x10^-6/degC, in this order of magnitude you are not going to see an appreciable deformation regardless which value you use.
Or just eyeball the table and use 23.4x10^-6/degC.
For OEM valves you will have to perform EDS. Honda is on top of their materials game and their engineering team is annoyingly hardcore and meticulous, I highly doubt you will find accurate information of what exact alloy was used.
Or look in your textbook and take an average for 2011 through 7075 since they're all a few tenths apart from each other. The maximum delta is .08x10^-6/degC, in this order of magnitude you are not going to see an appreciable deformation regardless which value you use.
Or just eyeball the table and use 23.4x10^-6/degC.
For OEM valves you will have to perform EDS. Honda is on top of their materials game and their engineering team is annoyingly hardcore and meticulous, I highly doubt you will find accurate information of what exact alloy was used.
05-31-2019, 07:58 AM
#6
What is the reasoning for the custom made valve guides? Also, what is wrong with the factory ones?
05-31-2019, 08:15 AM
#7
Unfortunately, most companies do not specify which alloy they use for their bronze valve guides and that bothers me a lot.
It's like saying "steel". Is it low strength? High strength? Stainless steel? There are so many alloys with different properties.
It's the same with "bronze"... I just want to know what I am buying.
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05-31-2019, 09:06 AM
#8
Well, I would like to switch to copper/bronze valve guides to reduce wear and increase the lifetime.
Unfortunately, most companies do not specify which alloy they use for their bronze valve guides and that bothers me a lot.
It's like saying "steel". Is it low strength? High strength? Stainless steel? There are so many alloys with different properties.
It's the same with "bronze"... I just want to know what I am buying.
Unfortunately, most companies do not specify which alloy they use for their bronze valve guides and that bothers me a lot.
It's like saying "steel". Is it low strength? High strength? Stainless steel? There are so many alloys with different properties.
It's the same with "bronze"... I just want to know what I am buying.
05-31-2019, 06:47 PM
#9
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