I looked them up and see one that is in the UK which would make it a lot less appealing due to shipping costs. But also see one that is in WI? Is that the one you are referring to? The one in WI looks like the right one and mentions these coatings. They are called Millinium Technologies though

 

Yep, it’s the one in Wisconsin. I got the name wrong. I called them just now and they said that whatever imperfections are in the bore are still there after coating.
I’m going to call a trusted machine shop and see if it is hypothetically possible to weld scratches, reborn, and then have it plated. If that’s the case, this might be a solution to saving a whole bunch of motors that would have been previously considered junk.

 

I wonder what the limit would be to just bore it out below the scratches and then recoat? I know the factory service limit for boring our engines but I believe that is mostly based upon the depth of the FRM coating, not necessarily how much material can be removed without structural or cooling issues. So it may be possible that you can bore the cylinder enough to remove some scratches without welding. Then have it coated. Would of course have to have oversize pistons though which I do not believe Honda would offer (Since you are not supposed to bore the block that far). So I guess that would then require aftermarket pistons instead of Honda.

Also, as a side note, I used to live in MN and knew a guy there that went by Turbo Tim

 

First phone call made to a local shop ended with the person saying the big challenge is determining the silicone amount of the metal and fitting a welder inside the bore. He said it’s not terribly simple. He defaulted to the standard sleeve answer, and when day pressed a bit more, he said overbore and different pistons. I’ll make a few more phone calls today. I’m hoping to find a solution to repair a block and return it to standard for OEM measurements. It’s all hypothetical, but now this thought has me wanting to find out.

 

Funny, I was just thinking the same thing. How much could be overboard and would pistons be available via some other larger bore Honda maybe?

I called APE machining that does motorcycles, but they are about as involved as a company gets with welding and repairing damaged motors. They referred me back to Millennium so I think it’s a closed loop dead end. They said something about thermal properties changing in not being practical.

Does anybody know if there are larger for pistons used in other Honda motors? Maybe like a K-series?

 

CP has some options

 

yep I was thinking aftermarket. Should be options out there I would think to get oversized ones.

 

This is off of their web site:
https://millennium-technologies.com/cylinderrepair/

NSC Automotive Cylinder Plating Service:

In the past, aluminum engine blocks with Nikasil, Alusil, or Locasil cylinder liners were considered non-repairable, especially if overbore pistons are not available or if standard displacement is required by racing regulations. Millennium Technologies can hone the cylinder to remove minor damage and scuffs and then plate the cylinder back to OEM size. Our NSC can be applied to one bank of cylinders or the entire block. This means that hyper-expensive engine blocks with minor damage can be remanufactured better than new!

Overbore and NSC Plate Automotive Cylinder Service:

High performance or repair, we can overbore your aluminum Nikasil, Alusil or Locasil block for more displacement. The block is stripped, machined, and then plated with our proprietary Nickel Silicon Carbide plating process for precise fitment of your big bore piston kit.

Install Aluminum Sleeve and NSC Plate Automotive Cylinder Service:

If the engine block has suffered extensive damage, Millennium Technologies has a solution. We can machine the block and install Nickel Silicon Carbide plated aluminum sleeves. NSC plated aluminum sleeves have better wear characteristics, oil retention, lower friction, and improved heat transfer compared to steel sleeves. In addition, because the aluminum sleeve is the same material as the piston, they expand at the same rate. This service can be applied to one bank or the entire engine block

Has anyone used NSC sleeves in the S? And/or are they compatible with the S pistons or would you have to go aftermarket pistons?

Rod

 

After market pistons = a change of con rods also ?

 

You’d only need to change rods if the deck height or pin size was different.