Lapping piston liners - what compound?

[DiegoVV]

Hello fellow members!

I am currently building en Edwards radial engine. Next part I want to make are the piston liners made out of cast iron.

I want to lap the ID to have a perfect fit with the rings but I am not sure about what compound I should use.

I have several grades of diamond paste, but I am afraid of the diamond to be embed into the liner surface.

I´m trying to find Timesaver as it´s advertised as a non-embedding compound, but seems impossible to be get in Spain.

So, I am afraid I am lost and all of your ideas will be more than welcomed.

Thank you all!!!

 

[WOB]

If you use a brass, copper or aluminum lap, diamond compound works very well and will not embed in steel or cast iron liners.
See http://modelenginenews.org/index.html for several articles about the process. Also http://adriansmodelaeroengines.com/catalog/main.php?cat_id=178 for some good tips on diamond lapping.

WOB

 

[DiegoVV]

Thank you WOB!!!
You´ve dissipated my biggest concern about particles embedding into the material. Very good article, I´ve read it now two times and I think I am now prepared for the challenge!!!

Best regards