Honing Liners

[unariciflocos 49 1 Cars]

I've run my engine for about 1 hour in total after fitting new liners, 8V ones made by Goetze in Belgium and I now want to replace the head and along with that replace the rings again. After one hour of running, mostly at idle, would I need to rehone the liners before fitting new rings?

[hoodygoodwood 70 3 Cars]

If they were new liners and rings I cannot see any reason why they would need to be touched again , just change the head taking care not to move the pistons or the liners will lift and allow crud into the seating area .Why change the rings again ?

[unariciflocos 49 1 Cars]

Because I reused the old rings with the new liners. I know it was stupid, but I was on a deadline and the new rings hadn't arrived in time, etc. Again, I admit I was stupid.

 

Is there a chance I can get away without rehoning them?

[hoodygoodwood 70 3 Cars]

The honing on a new set of liners will last for many thousands of miles , so you should not need to touch the liners . did you replace the 'O' rings that sit on the bottom of the liner , they are only around a fiver and will save all sorts of hassle later .

I bought new rings from Peugeot when I rebuilt my engine last year , they were an extortionate price , I will be using something else with my current project .

New rings should make a noticeable difference to your engine once they are run in ok .

[Tom Fenton 1,541]

If you are fitting new rings, hone the liners.

[Toddy 7]

My understanding is that the honing cuts are there to initially bed the rings in, once this is done they are ineffective at bedding in another set of rings, what is left is then blunt honing marks which act as oil galleries and can affect lubrication and oil usage.

[DamirGTI 342]

Right , aside from lubrication control cylinder honing/de glazing prime purpose is to act as an , say "file" , for bedding in the new rings .. to "file off" microscopic/minute imperfection round the surfaces of the new piston rings , as none of the new piston rings aren't made perfectly round from the factory (nor are the cylinders/bores perfectly round/straight) ie. without surface imperfection , thus they need certain amount of cylinder wall surface finish roughness for removing said imperfections making them precise/gas tight fit for each individual cylinder/bore .

 

This is also one reason why piston rings bedding in procedure must be applied as soon as possible after starting up freshly rebuilt engine . After starting up the engine , verifying that all is sound and ready for driving , once it's reached operating temp (oil/coolant) get the car on the road and perform ring bedding in procedure asap.. if you delay this procedure for a few hundred miles ahead , by that time the engine/cylinders will already use most of the cylinder wall surface roughness and thus the rings will need much more time/miles to bead in completely if they even do bead in after that .

 

Also , the cylinders surface roughness prep. should be done based on the type of the rings used . Chrome plated rings have extremely hard surface which is greatly abrasion resistant , thus they need a bit rough cylinders surface prep. while molybdenum moly coated rings need much finer surface prep. , almost mirror finish can be used because of they're micro porous surfaces , they also bead in way much quicker than chrome plated rings .

 

 

D

[unariciflocos 49 1 Cars]

Thanks for the advice chaps, I guess I'll have to rehone them. I really want this to be the last time I open this engine up, at least for a few years.