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| 6 cyl Bristol cars Type 400 to 406 - restoration, repair, maintenance etc |
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18-10-16, 10:42 AM
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Latest update.....
The liners are standard top and bottom but between 3 & 5 thou out in the middle with signs of the original honing along the surface. My guess is that they have done less than 10,000 miles since installation. Don't suppose I can return them to Bristol's now! The recommendation is to replace but my worry is why should they have bowed. Is it due to a lack of support in the block? Also, should the split skirt pistons be replaced with solid or slipper pistons or used with the new liner? Things are not looking good... 
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18-10-16, 11:38 AM
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peterg,
my guess is that if you measure the very top and bottom of the liners they will be standard as the rings don't come in contact with the liner . If in the centre of the liners there is .003 to .005 the liners are well worn . what is this centre measurement of the liner compared to the measurement at the top of the skirt at 90 degrees to the gudgeon pin . It is only a guess but I expect it might be as high as .007 in compared to about .002 inch needed for those split skirt pistons. If the pistons are in excellent condition you would then have to replace the liners & rings or buy a new set of .010 or .020 pistons and bore the liners to suit. Either way it will need fixing correctly Geoff
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18-10-16, 11:51 AM
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My man wants to replace the pistons because they are not suitable for use with modern petrol.
My anxiety is that the distortion is due to lack of support in the block, or are the liners rigid enough not to need it? My only experience is of wet liners that are much thicker.
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