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| Cylinder Bore 7/8" at a depth of 2.5" OR use DOM/CRS ? |
| << < (2/9) > >> |
| raynerd:
Hi Jim Yes, there is some on ebay : http://shop.ebay.co.uk/i.html?_nkw=seamless+tube+7%2F8&_sacat=0&_odkw=seamless+tube&_osacat=0&_trksid=p3286.c0.m270.l1313 but it is all expensive when I only need a small length. Or at least I consider it expensive, it`ll cost me the same sort of price for enough cast iron bar to make 3 cylinders...i.e get some spare. Hummm, I just don`t know. I think I`m still going to stick with trying to cut this long bore myself. Stew -> the fact that it also has to be a good finish is another thing that scares me, I know Brian Rupnow on HMEM said he used a hone on his cylinder. The plans call for a cast iron or leaded steel cylinder with an alloy piston. Brian and others have also used a Viton o-ring so my plan is to do the same! Chris |
| raynerd:
Do you think something like this would be OK for honing the cylinder? http://cgi.ebay.co.uk/New-Draper-BRAKE-CYLINDER-HONE-25-57mm-HONING-TOOL-/320635354194?pt=UK_Hand_Tools_Equipment&hash=item4aa75b3c52 |
| sbwhart:
Yes thats the sort of thing, but you can make your own from ally bar, turn the bar just undersize tap the end a sutiable size split it down the middle then put a screw down the end with a tapered head so that it springs it open then use this with fine grinding paste to hone the bore I'm sure you'll find something on this if you do a search. Stew |
| Bogstandard:
You will find that some people over on HMEM know very little, you have already named one, it is more like the blind leading the blind. If you are going to be using metal piston rings, then you hone the bore. This gives microscopic scratches to the surface of the bore (and also helps to straighten the bore out whilst doing it) which retains oil on the bore surface while the engine is 'bedding' in. After a while, the rings and bore will wear themselves smooth and the scratches will disappear. For use with o-rings, the bore must be lapped as smooth as possible, because if you hone, the scratches will rip the face of an o-ring to bits, and it will wear away in no time at all. |
| Jasonb:
Take a look at my IHC build over on HMEM, I've recently added the cylinder liner. Hope you are not including me there bogs ::) The liner is 1" bore and 3 1/8" long, you can see that I use a boring bar made from a bit of 3/4" bar, cross drilled for a HSS toolbit and also how I held the bar in my toolpost. I bored it a little under size and then used one of the sprung hones like your link, run it with parafin as this stops the stone clogging, i'm using CI rings. BTW you will need the two stone hone as the 3 stone is too big for a 7/8 bore if you decide on a honed finish Jason |
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