Broken top piston rings

Dellortoman said:
I wasn't suggesting it as an option. Just an interesting bit of history. You'd be struggling to find anyone who could do it these days anyway.

I used to get it done when I was living on a student's (shoestring) income and getting around on ratty old bikes. It was a kind of stop-gap measure to eke a bit more life out of old pistons before going to the next oversize. Also had it done to an old VW that was getting a bit tired and smoky. Gave it another year or two's life, enough to get me through university until I got a job with actual income.

Jeez, I feel like one of those white-haired old geezers with no teeth saying to the youngsters "when I were a lad, we used to ..."
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One of the local engine reconditioners used to offer it up till about 5 years ago. Last time I was in there they offered me the gear to do it as it was cluttering up the workshop.
Even I didn't want it - and yes I am one of those white haired old geezers....
 
Is the idea to make a worn piston a little bigger so as to bring the piston/bore clearance back into tolerance or is it to hold a little oil in the piston/bore interface? looks interesting either way. ???
 
AndyW said:
Is the idea to make a worn piston a little bigger so as to bring the piston/bore clearance back into tolerance or is it to hold a little oil in the piston/bore interface? looks interesting either way. ???
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Could have been either..............back in the day they used to come up with all tricks to save a bit of doe rae me... considering replacement parts were not readily available .......

I think it was a technique that Noah used when he was restoring the Ark as he was out of sheckles and couldnt afford new ones after having run the good old thing for 40 days and nights non stop.

Would not even consider trying in a high revving engine these days................far easier to just pour in a can of compression and get on with it............................

or do the job proper like and offer a new set of slugs into the equation.
 
In the Black country we can get liners made for ?20 a piece, heat the oven up and bobs your uncle . For those that don't know the Black Country is where the industrial revolution started and is still living in the 1860 some might say
 
Rebore and new pistons it is ,need a second mortgage! And I thought bevel bits were dear when I rebuilt my darmah engine . Let's hope it's worth it as I haven't even been on a laverda yet. Be interesting to see how it compares actually.
 
I have sent barrel to Keith for omega pistons and rebore . I am an engineer and do enjoy rebuilding engines myself. And the laverda is very straightforward compared to a bevel twin or t160 or CBx 1000 to name only a few that I have done (and still have and use)!
 
Mark sav said:
I have sent barrel to Keith for omega pistons and rebore . I am an engineer and do enjoy rebuilding engines myself. And the laverda is very straightforward compared to a bevel twin or t160 or CBx 1000 to name only a few that I have done (and still have and use)!
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The T160 motor isn't too bad as long as you have octopus arms when it comes to getting the barrel over the pistons without scrunching up the rings  :o :o  [font=verdana, arial, helvetica, sans-serif](I use Jubilee clips as makeshift ring clamps...[/font] :D ) Actually, come to think of it seating the rocker boxes correctly isn't much fun either..
 
AndyW said:
The T160 motor isn't too bad as long as you have octopus arms when it comes to getting the barrel over the pistons without scrunching up the rings  :o :o  [font=verdana, arial, helvetica, sans-serif](I use Jubilee clips as makeshift ring clamps...[/font] :D ) Actually, come to think of it seating the rocker boxes correctly isn't much fun either..
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yes,pistons a lot closer together! Then there's the gearbox ,and cross shaft etc.but mine is oil tight now and lovely to ride.bevel twin was a real challenge as well. Infinitely more difficult than a horizontally split engine. Do you still have the triumph Andy?
 
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