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Basic Engine Building DVD - Chapter 28: Honing
And finally we come to the main part of the machine shops job, honing ...
And finally we come to the main part of the machine shops job, honing the cylinder walls. It will do two things. First it will bring the cylinder walls to the matching diameter of the new pistons. Second it will leave a cross hatch pattern of light scratches, to keep oil on the walls and prevent metal on metal scraping. A dial bore gauge is used to bring it to the exact spec needed within 1/10,000th of an inch.
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usually, a machine shop will offer a single price for striping down the block, jet wash cleaning, bore, hone and cam bearing replacement. Estimate a few hundred dollars if you need all that done, but sometimes you will only need the cleaning and hone to clean up the cylinders.
Call a local machine shop and ask for a complete block machining price.
True honing is only capable by a large powered machine like the one in this video.
When you see stones on a drill that is being operated by hand, the process is not honing. The drill type stones are only capable of a "de-glazing" procedure that will remove a surface coating of carbon build-up or other residuals left on the cylinder wall.
A hand-drill powered de-glazer does not have the power required to outwardly apply pressure against the inside cylinder walls for a true hone job.
I have a question I wanna rebuilt my H22 engine starting with replacing the sleeves for the cylinders and the head valve train with high performence parts I have the pricing for the parts but I need to know how much a machine shop will charge to do that?? I can do everything else except for that! can anyone help me out!!?
Every machine shop is different and will have various price ranges for the work they do for you.
Best thing to do is contact a machine shop near you and just ask them for a quote for the work that you think you need done. They can also advise you of the work that you may not have thought of or didn't know was involved as a standard procedure.
angled cross-hatch marks (diagonal scratches) are the final hone of the cylinder bore as shown in this video.
Your cylinder wall should never be smooth as glass with a shiny chrome finish... there would be no way for small particles of oil to stick to the wall. The small droplets of oil are what keep your pistons moving smoothly and keep the cylinder walls from wearing away.
and yes, 175 psi across all pistons is a good compression reading for about 9:1 compression or a little higher.
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Estimate a few hundred dollars if you need all that done, but sometimes you will only need the cleaning and hone to clean up the cylinders.
Call a local machine shop and ask for a complete block machining price.
When you see stones on a drill that is being operated by hand, the process is not honing. The drill type stones are only capable of a "de-glazing" procedure that will remove a surface coating of carbon build-up or other residuals left on the cylinder wall.
A hand-drill powered de-glazer does not have the power required to outwardly apply pressure against the inside cylinder walls for a true hone job.
Best thing to do is contact a machine shop near you and just ask them for a quote for the work that you think you need done. They can also advise you of the work that you may not have thought of or didn't know was involved as a standard procedure.
Your cylinder wall should never be smooth as glass with a shiny chrome finish... there would be no way for small particles of oil to stick to the wall. The small droplets of oil are what keep your pistons moving smoothly and keep the cylinder walls from wearing away.
and yes, 175 psi across all pistons is a good compression reading for about 9:1 compression or a little higher.