Dura-Bar, usable for cylinder liner?
Dura-Bar, usable for cylinder liner?
The local metal boutique has Dura-Bar 80-55-06( http://www.durabar.com/products/ ) cast iron rounds. Would this stuff be good for a pressed in cylinder liner? How about a V8 crankshaft?
Re: Dura-Bar, usable for cylinder liner?
It will be fine for the crankshaft, but I do not think the 80 series would work for cylinder sleeves all that well. The 65 series maybe. The problem with that is, the rings may never seat as the cylinder\ring wear would be minimal. A lapped cylinder/piston could be a different story.
Ductile iron will have a tendancy to close the structure pores on the surface more readily than gray iron. Open structure helps maintain an oil film in the bore. A lapped piston/cylinder would need to maintain oil clearance at running temperatures.
As I recall....nodular or spheroid grain is created by the addition of magnesium. This puffs the flat grain graphite flakes. Some of these changes can occur during special cooling or heat treating processes to a lesser extent.
The best material for sleeves and rings with good stability and strength is Centrifigal spun gray iron, so that the grain boundries go around the circumference instead of through its cross section at odd angles.
I think Coles Power Models handles some of this material.
DC
Ductile iron will have a tendancy to close the structure pores on the surface more readily than gray iron. Open structure helps maintain an oil film in the bore. A lapped piston/cylinder would need to maintain oil clearance at running temperatures.
As I recall....nodular or spheroid grain is created by the addition of magnesium. This puffs the flat grain graphite flakes. Some of these changes can occur during special cooling or heat treating processes to a lesser extent.
The best material for sleeves and rings with good stability and strength is Centrifigal spun gray iron, so that the grain boundries go around the circumference instead of through its cross section at odd angles.
I think Coles Power Models handles some of this material.
DC
Re: Dura-Bar, usable for cylinder liner?
Yes. wonderful stuff and for a crank,less flexing.
Brian
Brian
Re: Dura-Bar, usable for cylinder liner?
I made a cylinder liner from Dura bar G2, ( leftover from a work project), and so far it's worked out fine, with steel rings and an aluminum piston. The stuff is really nice to machne, no hard spots like one off castings. Plus, it's fairly cheap and available.