Flex hone a cylinder

[frilaens]

Anyone used "Flex hone" on a motor? I'm thinking of honing an old single cylinder VP 2001 cylinder with a much cheaper cylinder-shaped polishing-brush. The result should give the required criss-cross patterning as the action is the same. Anyone tried this?

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[andy01842]

I not sure of the type of "Flex hone" you are referring to. If it is the type with 3 honing stones and you are going to glaze bust the bore to allow new rings to bed in they are vary good. You will need a slow drill and lots of paraffin. If it is the type that looks like a brush with a small ball on the end of each bristle you would be better to use a bit if wet & dry wrapped around a bit of wood.
If the bore has a lip of wear at the top you will need a “ridge dodger” ring as otherwise the top ring will break.


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[floatything]

If you are using the type with 3 stones that are pressed against the cylinder walls - the recommended lubricant is brake fluid. Follow the instructions to get the correct angle of intersection between the honing marks. If I remember correctly its about 50 degrees. This is achieved by moving the unit up and down the cylinder at the right speed. Don't overdo it - you aren't doing a re-bore - merely a re-hone. Its very effectinve at giving new life to old engines.

Good luck.

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[halcyon]

If it's the same animal. it's not for honing, they were known as glaze busters.
A simple tool to rough up the cylinder wall, allowing new rings to bed in. if you had a broken ring and were replacing them. If the bores were badley worn or scored then you needed a rebore.


Brian

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[andy01842]

A splash of paraffin in the eye is not nice but a splash of brake fluid would mean a trip to the hospital. Wear goggles! Having said that if the lube is spraying about the drill is running to fast. Do it slow, genital and check frequently. The length of stroke is important; the stones must come out of the end of the bore but not to far to keep the bore parallel.

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[floatything]

"Do it slow, genital and check frequently. The length of stroke is important"

Oooo-er Madam

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[frilaens]

The flex hone tool I have seen is this <A target="_blank" HREF=http://www.newmantools.com/flexhone/>http://www.newmantools.com/flexhone/</A> and I assume I have seen the result in the machine shop. The cylinders were clean with a criss cross pattern. When I go back to collect the head after having it skimmed I will ask about it. I was wondering if I could acheive the same effect on an old and knackered motor with a rotating polishing brush, the idea being to remove some of the dis-colouring and markings in the cylinder to check it's condition without taking the motor in to a mechanic. I don't intend to have it out or re-bored or the rings changed at the moment until I am sure that the problems I had last season are fixed (overheating and an oil leak into the raw cooling water at high revs.)

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[Avocet]

You can but a tool like a big flapwheel on a long shank for de-glazing bores. I've just done mine this winter. It's a coarse (ish) grit set of flaps bonded to the shank which then goes in the drill. It only took 30 seconds or so. I guess it would be pretty useless for honing and definitely useless for a re-bore but if your bore is basically go (just too shiny) this seems to work fine.

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[andyball]

Used widely as a hone after rebores in the m/c trade, also for glaze busting.



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