Boring / honing wet liners
Discussion
Helping a friend rebuild a Peugeot Mi16 race engine and we need a set of the standard wet cylinder liners bored and honed from 83.0 mm to 83.5 mm. Whoever did the job on the current engine made a pig's ear of it by boring too close to finished size and ending up with hardly any honing pattern and consequently high oil consumption and blowby.
It's a simple job if you have the right jigs already made up to clamp and hold the liners evenly but a pita if you have to make those up specially first. I assumed, rather sensibly I thought, that the people best tooled up for the job would be those who advertise that they make and sell performance liners for such race engines anyway but they weren't interested, probably on the grounds that it would be losing them a sale of their own rather expensive HT steel liners.
So can anyone recommend a firm that can do this properly with the right tolerances and cross-hatch honing finish?
It's a simple job if you have the right jigs already made up to clamp and hold the liners evenly but a pita if you have to make those up specially first. I assumed, rather sensibly I thought, that the people best tooled up for the job would be those who advertise that they make and sell performance liners for such race engines anyway but they weren't interested, probably on the grounds that it would be losing them a sale of their own rather expensive HT steel liners.
So can anyone recommend a firm that can do this properly with the right tolerances and cross-hatch honing finish?
How about getting the liners nikasil lined and re-honed back to 83.5mm?
http://www.langcourt.com/page16.html
http://www.langcourt.com/page16.html
Well that turned into a frigging nightmare. I won't say who my friend went to in the end, although it wasn't anyone suggested in this thread though I did phone most of them to see if they were interested and/or capable of doing the job. The liners came back with up to 5.6 thou ovality due to being clamped under such pressure that they distorted oval, were actually bored true to size as far as I can tell from average diameter measurements taken at several places round the bores but then sprang back oval again once the top clamp was taken off. One liner, the one with the worst distortion measurements, was actually now split at the bottom with a small hairline crack and a diametrical measurement 10 thou below target size in one plane.
So that's a set of hard to find Mi16 liners scrapped and back to square one on the engine build.
So that's a set of hard to find Mi16 liners scrapped and back to square one on the engine build.
Just had a chat with Duncan at Westwood liners, they stock the liners in question in ductile iron (which has a far greater hoop strength than regular spun cast material). So if you need replacements they are available off the shelf ...
Unit 3 George Baylis Court, George Baylis Road, Berry Hill Industrial Estate, Droitwich, Worcestershire
01905 799470
Dave
Unit 3 George Baylis Court, George Baylis Road, Berry Hill Industrial Estate, Droitwich, Worcestershire
01905 799470
Dave
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