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[Alan R]

Hi Guys----------LES, the ones that I've been involved with over the years had a "Floating-Head" which tends to follow the existing alignment,similarly with any honing as well. BUT }---- they were quite old and modern ones could well be a true vertical borer, which is what we are looking for here I think ?. I'm a tad confused now---how do we know this barrel is from a different engine ?? Have I missed something, somewhere ?? To me, the term "Clock" is generally recognised within the machine engineering world as in-house slang for a DTI......... has been for donkeys. Unless you happen to "clock" a nice pair .......... ????

[Les H]

Hi Alan. I thought this post was about a second hand barrel that Andy W bought for his BSA (First post on this thread!) I have made no references to the word "clock" at all so I don't understand why the word is being brought up...Dennis is the one talking about clocking. ATB.

[Dennis C]

Sometimes when writing on a message board we use terms which are quite normal to us, but then think afterwards that some people may not understand what we are talking about, this is why I tried to clarify what I meant by the term "clock", anyone with an engineering/machinist background should know what it was, but I just wanted to make it clear to any others reading the thread, I think Alan's reference was intended for me. ------ Yes Alan things it would seem have moved on and I have access to a fully equipped toolroom complete with true vertical borers, but as I am sure you know these will only bore the hole the operator sets it to do.---When carrying out a rebore I always set the borer to a true vertical bore (the exception being my Triumph due to the bore being worn sloping and only having 10thou oversize pistons available), but if I am working on an engine and find the bore is not vertical I am not going to carry out a rebore for that reason alone and this has never caused any problems as previously stated.

[Alan R]

-----sorry guys, that was just me getting hold of the wrong end of the stick. I mis-read it as being from a different TYPE of engine. Too much mid-night oil-burning I reckon. LES, as DENNIS says that was just my general reply agreeing to his use of the term "Clock". The last time I used a vertical borer (professionally) was at the SVR works machining the crowns on locomotive axle-boxes. It still does my head-in trying to put a cut on IN REVERSE ORDER as it were---especially on the 6" radius at the top end. I wonder how our friend has got on ???

[Alan R]

Hi ANDY-----------any updates ?? What B40 head was it---4 stud or 6 ??

[andy w]

Just a quick update on the engine repairs.
I took the barrel to the local machining shop and was advised I could get a liner at +2mm on OD.Barrel to be bored with a step for location,liner fitted and sized for new or existing piston.Quote £70+vat for machining+£40 for liner inc.del.
I had another look at the barrel using an engineers square and there was say 10 thou out of line showing.Checking my old worn barrel more wear was showing but this was not out of line.In the end I have put the `out of line `barrel onto the engine and hope to get it all back together soon.
The engine is for a 1961 BSA B40,normally having a 4 stud fixing for the head.The second hand barrel has the 6 stud holes,I have been told they are interchangeable.
Hope to be able to report again when running.Thanks for all comments.