Hi  Archie
The bake and blast system seems to be the very best way to get rid of rust on cores.
There is a smaller but time consuming small vat size of material but it takes a week to deep clean a large block.
It uses a feed molasses  in hot water which creates a reverse electrolysis situation to remove rust.
It uses a small current from the liquid to the block and it works really well.
But bake and blast or even just a hot tank clean and a tumble blast type clean is what I have gone to for rust on cores or customers components to avoid the long time spent in the glass bead cabinet cleaning rusty parts.
t
But yeah there is no chemical that removes rust especially in the cooling system passages.
 

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Well guys another year is coming to a close and its been hard for all of us.
2020 has been a year I hope I will not see any time in the rest of my life. After having that covid flu I can tell you for all the non believers out there this shit is bad news.

I hope you all have a very merry and safe christmas and a safe and happy new years.
Best wishes to everyone in 2021.
And keep your distance wear a mask and don't lick the windows on the bus. lol
See ya all next year

Well Archie I have been asking that same question for a few years now and the only conclusion I can draw is in alot of cases they can be much more cost effective then conventional vitrified stones we have used for years.

I use the example of shops that do not bore to .003-.005 before finished size to hone to size they just use a roughing stone and a selection of other stones to get to size and desired ring finish. 
EG: If you use a EHU 123 stone set to rough out blocks depending on hardness of the block you mat get 4-5 large bore blocks before they are done. Diamonds on the other hand may do 100+ blocks and keep going as long as they do not get crashed which happens from time to time we have all been there but there is a learning curve for finish to go through and a profilometer is a must have item to get it perfect with diamonds.
I have a CV-616 and while there is a diamond setup available from Sunnen for this machine I know guys that use them on a Ck-10 but for roughing only then vitrified to finished size like usual.

Back in the day K-Line sold diamond hone heads for Sunnen and other machines as well as others but there is a difference in stone numbers on the hone head. Some have 4 dual stones some have 6-8 single stone segments.
The coolant is also water based not a bad thing but its subject to developing a fungus like wet surfacers do when not used for a long time and the coolant goes rancid and smells like crap.
Its a good way to update that's for sure but the cost has to be weighed against the conventional honing methods and materials used. A couple shops I know that switched wish they never did because of machine issues in the early stages of their existence with circut boards and like all rottler machines I have seen their customer service can be an issue getting replacement parts in some cases while other shops seem to have not issues with them.

I have been looking into getting a CNC machining center just not made the room for it yet but if you have th

It depends on relief angle of cutter.
Chatter will destroy the cutting edge faster then cutting a bunch of seats. Speed and feed also have a gearing on the life span.
I use only Newan seat cutter inserts and most times I will get 100+ seats on plain cast before touching up
On Real hard or diesel seats depending on seat angle 50+ on a 45 and 37.5 and shallower 100+.
What issues are you seeing??