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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 15:21
I sort of assumed most would realise that. I was just referring to the fact that there are different types of oil ring.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 15:37
My apologies Brian.My comment and pic' was for the benefit of anyone who thought that the spring was part of the packaging.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 15:41
Oh, if it's there, it's there for a very good reason.
 
All oil control rings seem to be quite brittle, I once found that out the hard way. Try buying one oil ring for an overbored engine. Fortunately I managed to speak to a very helpful man at the London Piston Ring Company. (Do they still exist?)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 15:51
Don't know about the London company but this company have been very helpful in the past.
http://www.fwthornton.co.uk/
I had a + 0.060" piston for a Panther M100 but no rings.They lightly machined the piston to accept rings from a Rover.That was thirty seven years ago and they are still going.I wonder if the Panther is?
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 16:13
This is what fascinates about engineering.

How do they know that they need that little ring when they are creating the engine in the first place.?

Baldrick answer please.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 16:21
You do realise what sort of answer you are likely to get from Baldrick?
 
In my case the guy cross referenced the exact size to another engine and found the correct size.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 18:56
What I mean when they are designing these engines.
If you like going back 100 years.
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 20:21

Originally posted by Dave P. Dave P. wrote:


Like this.My 850Gt when I first got it.


Yep that's it!


"Chicken nuggets don't dance on a Tuesday."
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 20:30
Originally posted by red leader one red leader one wrote:

What I mean when they are designing these engines.
If you like going back 100 years.


You mean piston rings? Need piston rings to make a gas seal. Pretty sure this would have been found out very shortly after the first steam engine was made. Unless they anticipated it. Big smile

First steam engines, around the late 18th century?

Pretty sure steam engines need rings too and so they naturally followed into IC engines.

The oil ring, aka oil scraper ring or oil control ring, recovers most of the oil from off the bore for reuse instead of it being just blown out and burnt. However a little bit must be left behind to lubricate the top rings. Which is the clever bit.

NB: did you know that honing the bore, i.e. leaving tracks of spirals, is to deliberately roughen the bore so that it traps oil that won't then be scraped off by the oil ring? I was told this literally a few days ago.




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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 21:03
What I mean is how did they know that a gudgeon pin needed holes and a circlip and a groove to put the circlip in.
Was it all trial and error as the development of transport was very quick.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 21:08
Oh right - well just to confuse the issue further, a different design uses buttons in the ends and not circlips. Big smile



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 22:05
Originally posted by Mike H Mike H wrote:


NB: did you know that honing the bore, i.e. leaving tracks of spirals, is to deliberately roughen the bore so that it traps oil that won't then be scraped off by the oil ring? I was told this literally a few days ago.

Surely you have heard of glaze busting?
 
But not in our Nikasil lined bores.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 22:29
Originally posted by Brian UK Brian UK wrote:

Surely you have heard of glaze busting?


I have, but didn't know the full details of what it meant. Embarrassed



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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziPaul Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2017 at 19:19
Well I think I've sorted it... Cam followers were fine, no pitting or marks. No problems with piston or bores. Exhaust tappet clearance was a bit tight but sorted when put back together.

I had the tank off whilst the head was off and noticed a few marks under the tank in the area of the choke lever. The bolt head for the choke lever body was also a bit shiny and lined up with the marks on the tank., I'd suspected this before but didn't really think it could be the cause of the noise. However, having not found anything within the engine and put a couple of bits of rubber under the rear petrol tank mounts which lifted it up 3 or 4mm. Went for a 40 mile ride (after connecting the RHS fuel pipe Embarrassed) filled up with petrol after about 20 miles and even with a full tank of fuel, no unusual noise even with spirited riding (got to fully test it.
So yes the noise came from the left hand side of the engine but it was on the outsideErmm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2017 at 19:48






Doh!





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