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compressions and broken ring
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Timstopp



Joined: 16 Oct 2008
Posts: 95
Location: colchester, essex

PostPosted: Sun May 03, 2009 6:47 pm    Post subject: compressions and broken ring Reply with quote

Having been out and about on the drive it day, and having suffered a few "issues" I did a compression test this morning - the results of which were 111, 112,115, 90 psi on a cold engine, so I have dropped the sump and removed the lowest piston. When it came out 1/2 of one of the piston rings was missing (bits of it in the sludge in the sump. Now, can I source just a piston ring of the correct dimensions ie 60mm and rectangle profile and fit this straight back? and does anyone know where I might get one?
I know to do a "proper" job I should hone the cylinder, but I don't want to take the head off, and also I suspect that would then put this cylinder's compression above the others. I hope that although the readings are low, if they are equalish it should be ok


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Wolseley Nine 1934 Morris 8 tourer 1936
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peter scott



Joined: 18 Dec 2007
Posts: 6233
Location: Edinburgh

PostPosted: Mon May 04, 2009 3:01 pm    Post subject: Reply with quote

Hi Tim,

I think you'll be able to get rings from http://www.cpearsonpistons.co.uk/index2.html

If not he'll probably know where you can try.

Peter
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1939 SS Jaguar 2 litre saloon
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Timstopp



Joined: 16 Oct 2008
Posts: 95
Location: colchester, essex

PostPosted: Tue May 05, 2009 9:29 am    Post subject: Reply with quote

Hi
Thanks, I tried but he does not have any, nor does he know anyone who might. - they are 60mm pistons, +020. Does any one have any idea's?
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Rick
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Joined: 27 Apr 2005
Posts: 21219
Location: North-west UK

PostPosted: Tue May 05, 2009 9:34 am    Post subject: Reply with quote

Timstopp wrote:
Hi
Thanks, I tried but he does not have any, nor does he know anyone who might. - they are 60mm pistons, +020. Does any one have any idea's?


you could try Lancaster Vintage, they might have something. If push comes to shove and they simply aren't available, you could get some made up as happened with my Dodge's lump.

R
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Various 1920s-1960s - Austin, Morris, Commer, Dodge etc.
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Kelsham



Joined: 18 Jan 2009
Posts: 349
Location: Llandrindod Wells Powys

PostPosted: Tue May 05, 2009 11:17 am    Post subject: piston rings Reply with quote

Hi I have had similiar problems getting rings for my 1932 BSA Vtwin Trike engine.
Eventually I tried my local engine rebuilder and they widened the gap the ring seats in and supplied wider rings.
This has worked well for the last few years. regards Kels.
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Timstopp



Joined: 16 Oct 2008
Posts: 95
Location: colchester, essex

PostPosted: Tue May 05, 2009 2:51 pm    Post subject: Reply with quote

Rick - where did you get your rings made up, as it looks like I might have to go down this route. I have a full set of +30 and +40 pistons, so I could re-bore and use these but this seems silly as the engine does not warrant a full rebore, just for one ring!
(unfortunately the other pistons have different ring designs)
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Rick
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Joined: 27 Apr 2005
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Location: North-west UK

PostPosted: Tue May 05, 2009 5:17 pm    Post subject: Reply with quote

Timstopp wrote:
Rick - where did you get your rings made up, as it looks like I might have to go down this route. I have a full set of +30 and +40 pistons, so I could re-bore and use these but this seems silly as the engine does not warrant a full rebore, just for one ring!
(unfortunately the other pistons have different ring designs)


Hi Tim

The new rings were sourced from somewhere during the engine's rebuild, you could have a word with Henry Arnett (address and contact details are on the page below), who did the rebuild, he might be able to sort something for you.
http://www.oldclassiccar.co.uk/dodge_rebuild/part19_enginerebuild.htm

Rick
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Various 1920s-1960s - Austin, Morris, Commer, Dodge etc.
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