Cylinder liners needed

What is the latest info on getting broken or maximum over sized cylinders re-lined?

I have a few cylinders that have cracked bottoms that could be re-used with new liners.
Is this the best way to go or are new manufactured cylinders and piston sets the most economical?

This standard size bore cylinder barrel came out of an Atlas that had set with stuck pistons for 25 years. What a shame.

These are 750 cylinders - they are not repairable with a liner as they are too thin at the recesses for the nuts. A good welder with knowledge how to weld cast iron (needs a lot of heattreatment before/after) could repair that crack in the picture. I have successfully brazed shorter cracks.

WEAL

I concur with WEAL. Some people have successfully fitted liners to 750 cylinders, but there really is a high risk of them breaking at the bottom flange. Most of the Norton race tuners back in the day wouldn't use anything larger than +.020" pistons because of the risk of breakage.

Ken

Any good to you?
http://pages.ebay.com/link/?nav=item.vi ... 28&alt=web
Ta.

Thanks all for the info. It seems that the opinion is not to re-line the 750 cylinders.
Those spigot liners would probably be used for early Atlas models that had the spigot and matching head cut out.

I just hate to see these big lumps of cast iron get scrapped.
I got the original concave dish pistons out of the Atlas, maybe keep for momentos.

I do have a Dunstall 810 cylinder that I believe can be re-lined down to standard 750 pistons.
Anyone have experience with this?

Bob Z. said:

Thanks all for the info. It seems that the opinion is not to re-line the 750 cylinders.
Those spigot liners would probably be used for early Atlas models that had the spigot and matching head cut out.

I just hate to see these big lumps of cast iron get scrapped.
I got the original concave dish pistons out of the Atlas, maybe keep for momentos.

I do have a Dunstall 810 cylinder that I believe can be re-lined down to standard 750 pistons.
Anyone have experience with this?

Click to expand...

I've relined 810 cylinders back to 73 mm bore for standard 750 pistons. Liners are available from LA Sleeve, but you will have to special order them. Their part no. for the 810 liners (76 mm bore) is FL-227. You need to tell them you want liners made identical to them, but for 73 mm bore. That's a really old part number, no longer in their catalogs, but still a good number. I recently ordered a couple sets, and after the sales rep looked up the number, he asked me where I had found that part number. I told him it was from one of their old catalogs, and he thought that was pretty cool.

The liners do not come with the cutout at the bottom for connecting rod clearance. You'll have to do that after installing the liners. It's pretty simple to cut them on a milling machine, but you could also do it by hand, with a bit of care. Use the old liners to get the pattern.

Dunstall used a grub screw (socket headed set screw) at the edge of the liner lip to make sure the liners didn't move. Because it's difficult to cut the partial threads in the replacement liners, I replace the screw with a simple steel pin.

Ken

I just had a 750 cylinder relined by Bill Moeller at Bore Tech. He did a good job!