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Question about compression rings

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SunderlandSteve Steve P
Lewis Lake, NS, Canada   CAN
Dear TR6ers,

I'm rebuilding the engine of my 1970 TR6. The standard size crank journals and cylinder bores were well within tolerances so I elected to fit new main and rod bearings and a set of std size Hastings rings to the original pistons. I honed the cylinder walls with a flex-hone tool, but on parts of the cylinders there is very slight ridging, barely visible and hard to feel, at the upper limit of the top compression ring travel. The new top compression rings look square edged, not the "rim dodger" type that I remember fitting to my old Ford escorts back in the day. So here is my question: is it worth grinding a small bevel on the top edge of the new rings to avoid the rim, or will that cause other problems?

Thanks in advance
Steve

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POW Peter Wirth
HEBRON, NH - New Hampshire, USA   USA
I would not worry in the least about what you describe as being not much more than a shiny stain at the to of the bore. I would definitely not attempt to modify the rings in any manor. Flex hones are fantastic for introducing a nice cross-hatch to a glazed bore that otherwise does not need machining. I used one on my TR8 engine when I changed to high compression pistons. The bore was fine but of course a new cross hatch was needed. The engine never smoked before and it does not now, at all. - Pete

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poolboy Avatar
poolboy Ken D
Sandy Hook, MS, USA   USA
It all depends on the size of the ridge...it it's too big, the rings may close up their gap during the piston install and break.
Before you install a piston put a ring in the cylinder on top of the ridge and see if there's any gap left.



ZS carb repairs
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glcaines Silver Member Gary Caines
Hiawassee, GA, USA   USA
I have always removed the ridge with a reamer before honing a cross-hatch pattern. I try to achieve an even cross-hatch while removing minimal amounts of metal while honing. I have never had a problem.



Current: 1973 TR6 W/Overdrive

Previous:
1963 TR3B W/Overdrive
1962 TR3A
1961 TR3A
1960 TR3A
1960 TR3A

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