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Model Forum / General / Models / April 2009Barrel Honing
I am currently building an IC engine, the barrel is 24mm bore by 50mm long. I need to finish the bore (currently bored and not a brilliant finish as I should have put in a new tip!!!) I am considering purchasing a "Laser" 2243 Brake Cylinder Hone as shown on this page. <http://www.toolsheduk.com/S/2/28/5/Vehicle-Repairs-and-Servicing.html> Does anyone have any experience of this unit? Alternatively... I do have a few diamond impregnated honing sticks (I believe they were made by Van Moppes) 100mm long x 3mm thick x 8mm deep however I would need to make a holder and not sure of the best design. Richard > I am currently building an IC engine, the barrel is 24mm bore by 50mm > long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 11 lines] > > Richard never seen one of those before . but the next hones i will buy will be of this design http://www.mytoolstore.com/kd/2486.gif this is the sort i see used in most engine recon shops ..and they swear by them . all the best.markj >> I am currently building an IC engine, the barrel is 24mm bore by 50mm >> long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 22 lines] > > all the best.markj Those are impregnated ball hones which are absolutely NOT what you want to hone a cylinder bore with proper cross hatch angles. To achieve that you want fixed stone hones which you can work up and down as they rotate. 24mm diameter is far smaller than anything I use but any honing specialist would be able to hone the bore properly to achieve the required 45 degree cross hatch angle for good oil retention. Sprung loaded brake cylinder hones are a poor substitute for proper engine cylinder hones which work on a micrometer feed to set the final bore size accurately.  SignatureDave Baker >I am currently building an IC engine, the barrel is 24mm bore by 50mm >long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 11 lines] > >Richard They look very similar to the ones I bought from Bruce Engineering many years ago. Those worked very well on the couple of occasions I have used them. David SignatureDavid Littlewood I also bought a set from Bruce eng. that look the same, worked a trea on a hit & miss engine that I made with a CI cylinder. Jaso -- jasonballam Hi Richard I'm new to this forum, just this minute joined. Reading your posting I would suggest if the nominal size of the bore is good but too corse or fine finish then running a cylinder hone such as you've suggested will be fine. It is what is used to "glaze bust" a polished bore, or less commonly to "smooth out" a cylinder where the 45 degree cross hatching is too corse. Otherwise you'd get excess smoke and oil consumption. Advise is take it easy and don't over do it, check sizes accuratley and use bore guages to measure ovality. Hope this is useful. timmydeutz >I am currently building an IC engine, the barrel is 24mm bore by 50mm >long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 11 lines] > >Richard >I am currently building an IC engine, the barrel is 24mm bore by 50mm >long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 4 lines] > >Does anyone have any experience of this unit? Looks a lot like the Sealey one except that comes in a kit with other sizes of holder and stones. It's OK for occasional use, and I daresay it'll do what you want, although you need to be careful about bore diameter, I imagine. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! >I am currently building an IC engine, the barrel is 24mm bore by 50mm >long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 4 lines] > >Does anyone have any experience of this unit? BTW, don't run it anticlockwise, it unscrews and bits go all over the workshop :-( SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! >I am currently building an IC engine, the barrel is 24mm bore by 50mm > long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 11 lines] > > Richard I had the same problem - but boring very slowly with a sharp HSS tool produced a really good finish. My engine (Nemett 15S) was 25mm bore in a cast iron liner. The other problem I had was I could not get the valves to seal and tried all ways to get a good seal. In the end I put the thing together, wound it up and after it fired a couple of times the compression improved, then it started and the valves sealed... >I am currently building an IC engine, the barrel is 24mm bore by 50mm >long. I need to finish the bore (currently bored and not a brilliant [quoted text clipped - 11 lines] > >Richard Thanks for all of the replies on this query. In the end I took it to the back street shop that reground the crank on my TR3A over 40 years ago. Barrel now honed for £5 <G> Richard |
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