5 replies to this topic

[087dave]

Hi all

Just two questions ,

When you hone a cylinder how much material are you removing?

What's the best way to clean a cylinder bore after a hone?

Cheers

[Gremlin]

Depends how much you hone it, if you have a bad finish before you start you may have to take out 0.005" or more, even if you only take out 0.001 - 0.002" it really will be too big and you'll need to go to bore it out to the next size or fit liners, an once you've honed it the machinist should clean it thoroughly, a powerful steam cleaner works well

[KernowCooper]

I'd measure any bore to see what it is compared to standard before honing, it may already be beyond spec and a rebore is required

[Cooperman]

I'd measure any bore to see what it is compared to standard before honing, it may already be beyond spec and a rebore is required

That is the case more often than not.

Many have honed and fitted new rings, then a few thousand miles later the engine is smoking, using a lot of oil and suffering from 'blow-by'.

With that is involved in a complete strip down it really is not worth trying to cut corners.

[Spider]

As a minimum, from a fresh re-bore, 0.0025" need to be removed, however if only 'glaze busting' and existing bore, then it shouldn't be enough that could be measured with conventional Mics or Snap Gauges, provided of course that the Bores were satisfary to kick off with, ie, the orginal honing still completely visable. If that's gone, then it's a rebore as Cooperman has suggested.

 

<Edit: Washing of the bores afterwards can be done by forst a Hot Wash, then soap & water, then ATF on paper, finishing with plain 20 weight engine oil on paper, keep going with that until the wetted paper cames out as clean as it goes in.>

Edited by Moke Spider, 24 January 2015 - 02:48 AM.

[ACDodd]

I use copious brake cleaner and tissue paper. Keep going until the paper comes out clean.