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8N piston and ring questions


 
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boler76
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PostPosted: Mon Oct 08, 2012 12:37 pm    Post subject: 8N piston and ring questions Reply to specific post Reply with quote

The engine is a '49 8N, The bore measures 3.22" the pistons measure 3.2", I need a piston as a ring gland is missing and I need a full set of rings, What oversize piston do I need and what Oversize rings do I need to fit these pistons . 3/32" comp and 3/16" oil grooves. 4 ring pistons. Thanks for help.
 
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R Geiger
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PostPosted: Mon Oct 08, 2012 2:03 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

boler76 wrote:
(quoted from post at 05:37:48 10/09/12) The engine is a '49 8N, The bore measures 3.22" the pistons measure 3.2", I need a piston as a ring gland is missing and I need a full set of rings, What oversize piston do I need and what Oversize rings do I need to fit these pistons . 3/32" comp and 3/16" oil grooves. 4 ring pistons. Thanks for help.


I would put in a new sleeve, piston set and be done with it. Original bore was 3.100"
 
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1951 8N
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PostPosted: Mon Oct 08, 2012 2:22 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

R Geiger wrote:
Original bore was 3.100"


You mean 3.188".
 
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kossuth
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PostPosted: Mon Oct 08, 2012 3:31 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote


 


Last edited by kossuth on Mon Oct 08, 2012 3:33 pm; edited 2 times in total
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boler76
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PostPosted: Mon Oct 08, 2012 3:44 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

another question, due to fact that there are oversized pistons in the engine already, how does one tell if the block has been bored out and oversized sleeves already put in??
 
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R Geiger
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PostPosted: Mon Oct 08, 2012 6:03 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

1951 8N wrote:
(quoted from post at 07:22:48 10/09/12)
R Geiger wrote:
Original bore was 3.100"


You mean 3.188".
That I did, have to proof read what I type.
 
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R Geiger
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PostPosted: Mon Oct 08, 2012 6:12 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote


About the only way that I think would be reliable would be to pull the sleeve and measure the bore. assume you have cast thick sleeves and not the thin steel ones.
 
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teddy52food
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PostPosted: Mon Oct 08, 2012 6:22 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

Piston is .030 oversize. I don't think you will find those anymore. Pull the sleeves & do it right.
 
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1951 8N
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PostPosted: Mon Oct 08, 2012 6:56 pm    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

R Geiger wrote:
assume you have cast thick sleeves and not the thin steel ones.


Why would you assume that? A 1949 8N would have had the .040 steel sleeves originally.
 
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boler76
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PostPosted: Tue Oct 09, 2012 4:17 am    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

more questions, from my search I find that the original OD of sleeve is 3.368 if they are original sleeves, they are cast, the measured ID is 3.22" does that leave me with .075" wall thickness, if so why would I change sleeves when I have .030" oversized pistons and this site sells them, Could I not just replace the one bad piston and use oversized rings again? I am not a mechanic, I am an old retired electrician, so need all the help I can get Thanks.
 
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Ken(Ark)
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PostPosted: Tue Oct 09, 2012 6:39 am    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

boler76 wrote:

Could I not just replace the one bad piston and use oversized rings again? .


Yes , that would be an option .

I would want to weigh the new piston and balance them all to the lightest of the four . Digital scales are cheap these days .

If money is not too tight , I would go with the .0825 over pistons and have the old sleeves bored in place for a fresh tight fit .

Chances are the .030 pistons will be loose , at least 3 of them . if you could swing it for a set of 4 new .030 pistons you would know that they all weigh the same and will have about the same clearances .

Basic rule of thumb is to keep everything equal as in all loose or all tight etc , just depends on cash flow .
 
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R Geiger
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PostPosted: Tue Oct 09, 2012 9:50 am    Post subject: Re: 8N piston and ring questions Reply to specific post Reply with quote

I assumed that because they appear to be bored oversize and don't think that would work with 040 steel sleeves, but then I have been wrong a few times.
 
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