sleeve issue

[F-Red]

Pretty sure it will arrive to them on monday so I should have some news soon.

Any news? :popcorn:

[Jerry Hall]

this may be true of an aluminum sleeved cylinder but in an iron or steel sleeve it will not create any localized stress unless the tapered pin forced deep into the mating surfaces.    also, in an aluminum sleeve it transfers the heat at the same rate so a sleeve sliding in the bore is unlikely if the fit is per manufacturers fit tolerances.

john

There will always be localized stress where the tapered pin is located.  When the cylinder is bored and honed, the bore should be perfectly straight and round at the temperature at at which it was machined.  The aluminum casting and the iron sleeve expand at different rates when there is a temperature change.  This is basics physics and we cannot change the properties of the two metals.  The temperature of the aluminum casting and the iron sleeve changes when the engine is running as does the interference fit between the two.  The stress in the area where the tapered pin is located will always be different than the stress at the interference fit on the rest of the sleeve and cylinder.   The CHANGE in stress is what creates the high and low spots in the surface of the bore.


A tapered pin or straight threaded bolt will not stay tight without creating localized stress regardless of the material it is screwed into.  The localized stress is what keeps it tight as does with any threaded fastener.  The change in stress would actually be less when a tapered pin is inserted between an iron cylinder with an iron sleeve than when a pin is inserted between an iron sleeve in a aluminum casting when there is a  temperature change.

[jcs003]

There will always be localized stress where the tapered pin is located.  When the cylinder is bored and honed, the bore should be perfectly straight and round at the temperature at at which it was machined.  The aluminum casting and the iron sleeve expand at different rates when there is a temperature change.  This is basics physics and we cannot change the properties of the two metals.  The temperature of the aluminum casting and the iron sleeve changes when the engine is running as does the interference fit between the two.  The stress in the area where the tapered pin is located will always be different than the stress at the interference fit on the rest of the sleeve and cylinder.   The CHANGE in stress is what creates the high and low spots in the surface of the bore.


A tapered pin or straight threaded bolt will not stay tight without creating localized stress regardless of the material it is screwed into.  The localized stress is what keeps it tight as does with any threaded fastener.  The change in stress would actually be less when a tapered pin is inserted between an iron cylinder with an iron sleeve than when a pin is inserted between an iron sleeve in a aluminum casting when there is a  temperature change.

lets agree to disagree.  but at this point i better return my degrees because apparently what i learned at CMU was wrong.

john

[89Longrod]

lets agree to disagree.  but at this point i better return my degrees because apparently what i learned at CMU was wrong.

john

What a great way to respond to information shared with you...Shows your maturity and appreciation for a guy like Jerry taking time from his day to stop by and share with us.

[jcs003]

What a great way to respond to information shared with you...Shows your maturity and appreciation for a guy like Jerry taking time from his day to stop by and share with us.

this was a mature response.  i ended the argument out of respect for his background and experience.  however, i feel his statement isn't valid.

john

[hontrx265r]

They displayed good business practice, and handled the issue with no hassle. I have no complaints.

[F-Red]

They displayed good business practice, and handled the issue with no hassle. I have no complaints.

That's good to hear. :smile-new:

[rsss396]

I don't think Jerry expects to be treated as God around here or any other forum, from what I have seen over the years he actually enjoys teaching and learning.
If you do think someone is wrong, explain in detail your argument supporting your beliefs, we never stop learning at any age and that applies the Jerry and even the engineering field itself.

[All250R]

The knowledge and credibility Jerry gives is a high value currency for this board, especially when keeping in mind when an unethical businessman plagued the .net site that so much disappointment has come from. Among several conversations I've been fortunate to have with him I've been to his shop in Az. Depending on the depth of the particular subject I can hold my own among most builders in a technical discussion, but Jerry is deeply, deeply knowledgeable, from years of data collecting and a deep background in physics. That experience is irreplacable. He's well known among builders and his credibility is among the top in the industry, globally.

[C-Leigh Racing]

All250R,
Where have you been, little vacation maybe ?? :ride:
Neil

[All250R]

All250R,
Where have you been, little vacation maybe ?? :ride:
Neil

Hey Neil, thanks for asking. I browse periodically and wish I had more time for things - certainly not on vacation. Hope things are going well in your neck of the woods battling the 4stroke nuisance with premix.
Jason