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1776 head machining spec
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Irfast
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PostPosted: Tue Jan 14, 2020 12:42 pm    Post subject: 1776 head machining spec Reply with quote

Quick question, I hope! Does anyone know the exact cylinder bore diameter for the cylinder to head interface?
I believe I may have the wrong heads in this kit I ordered. I measured the cylinder to head spigot at 97.77mm and the Head bore that it fits into at 98.14.
Does anyone have experience with this much slop between the cylinder OD and the Head Bore?
Thanks in advance for your help.
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Chickensoup
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PostPosted: Tue Jan 14, 2020 12:55 pm    Post subject: Re: 1776 head machining spec Reply with quote

I wanna know this too for when i get my mill upgraded!! Very Happy
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RWK
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PostPosted: Tue Jan 14, 2020 2:00 pm    Post subject: Re: 1776 head machining spec Reply with quote

sounds about right, I use around .2-.3mm, a little much though, whats more important are the depths both alike, that's where they seal.
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Irfast
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PostPosted: Tue Jan 14, 2020 2:12 pm    Post subject: Re: 1776 head machining spec Reply with quote

RWK wrote:
sounds about right, I use around .2-.3mm, a little much though, whats more important are the depths both alike, that's where they seal.


I understand the seal is at the top of the cylinder to the head bore surface. I am not confident with this much slop between the OD of the barrel and ID of the head.
Anyway, what kind of sealant do you like for these machined interfaces? I used Permatex Aircraft.... It is a bear to clean off!
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sled
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PostPosted: Wed Jan 15, 2020 8:14 am    Post subject: Re: 1776 head machining spec Reply with quote

Irfast wrote:
RWK wrote:
sounds about right, I use around .2-.3mm, a little much though, whats more important are the depths both alike, that's where they seal.


I understand the seal is at the top of the cylinder to the head bore surface. I am not confident with this much slop between the OD of the barrel and ID of the head.
Anyway, what kind of sealant do you like for these machined interfaces? I used Permatex Aircraft.... It is a bear to clean off!



no sealant is used between the head and the cylinder, only the base of the cylinder and the case.
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Irfast
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PostPosted: Wed Jan 15, 2020 8:37 am    Post subject: Re: 1776 head machining spec Reply with quote

sled wrote:
Irfast wrote:
RWK wrote:
sounds about right, I use around .2-.3mm, a little much though, whats more important are the depths both alike, that's where they seal.


I understand the seal is at the top of the cylinder to the head bore surface. I am not confident with this much slop between the OD of the barrel and ID of the head.
Anyway, what kind of sealant do you like for these machined interfaces? I used Permatex Aircraft.... It is a bear to clean off!



no sealant is used between the head and the cylinder, only the base of the cylinder and the case.


Thanks for this heads up! I have always used Permatex Aircraft at the head interface with the barrels without any issues. It was cold and, the permatex was a brand new can but seemed sort of lumpy when i applied it. So, I am thinking that is the crux of the issue.
Thanks again!
Jim
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