Cylinder Bore help...

[europeanme]

currently looking at having my block honed, i had a sudden spring in my mind...does the honing marks need to be at a certain angle or is it a standard direction used by most machine shops??....

thanks for all help given...

Mike

[Herm]

The marks left are from 3 wet stones (usually) that are spring loaded to push against the bores, they are on a pivot on the center line of the stones so they will always push flat with the bore sides.

Hope thats a help to you

[Herm]

Standard practice for any machine shop and any old school garage

[europeanme]

The marks left are from 3 wet stones (usually) that are spring loaded to push against the bores, they are on a pivot on the center line of the stones so they will always push flat with the bore sides.

Hope thats a help to you

sorry my bad....i understand the basics of honing but was wondering if the actual honing process has to follow a certain path in the bores.....i.e. running at, for example, 16° to the top face of the block or someting similar or is it just a scored path as per any standard hone....

[Herm]

No they are just flat wet stones that stay parallel with the face of the bores.

[europeanme]

sorry to be a dunce but what about as the honing tool traverses up and down the bore?....

[Flat on my back]

.

As the stones travel up and down the bores they cut a 'figure of 8' pattern in effect, this can be altered by the shop...i'm sure?

Need to speak with my shop, Monday ok?

[Herm]

the speed of the stones going around and the speed of them going up and down will vary the tightness of the markings left by the stones. Hope that helped

[Tonks4x4]

Dude this is what I was talking about.... I have found this

Cross Hatch
The correct angle for cross hatch lines to intersect is approximately 45 degrees. Too steep an angle promotes oil migration down the cylinder resulting in a thin oil film which can cause ring and cylinder scufflng.

Too flat a cross hatch angle can hold excess oil which conversely causes thicker oil films which the piston rings will ride up on or hydroplane. Excessive oil consumption will result.

And this from another hot rod engine builder

Crosshatch angle is important, but not as critical to creating a perfect bore as roundness, straightness and surface finish. Typical crosshatch angles are 45 or 30 degrees, +/-5 degrees. Lighter tension rings will usually use the 30 degree crosshatch angle. A steep crosshatch provides a faster relief of oil, while lesser angle holds more oil. Another aspect is ring rotation, which is driven by steeper angles, so the lower angles are more appropriate with low-tension, thinner, rings.

[europeanme]

45° it is then....

thanks chaps.....

[QuattroFever]

interesting!
My local shop done mine at 35 degrees. Had it looked at by a forum member who advise it should be 45.

My local builds motors and heads all day long why would he say different to the general 45 degrees on here?

EDIT: both were shown pistons and rings.

Is one more daily driver friendly than the other? Ie high revving wants better oil relief.

[Acidburn]