porous cylinder

[Fire-medic]

This kind of defect isn't what you expect to see in a modern bike, this is from a Hyabusa which also was victim of a careless assembly by someone prior to the current owner. They didn't replace the hollow dowels for the cam bearing/covers.

 

[93max]

Pitting?
I had a similar think with an engine I had for my nova.
7 out of the 8 cylinders had rust in it.
It was rebuilt but sat for years.
I paid nothing so I dingle berry honed it with the pistons in it, rotated it upside down on the engine stand , cleaned it then ran it.
It ran for years and even went 11.70's with afr heads.
It didn't smoke or anything.
I was young and broke so I ran it.
What year engine ?
I guess from what you've said it was apart before.

 

[Fire-medic]

Perforation in > 1 place, a used bike, being drag-raced & licensed for the street, but not really used much on the street. Enlarge the pic to see the defects.

 

[one2dmax]

Unless the pit went all the way through into the coolant or other area I don't expect that would have been much of an issue? The missing dowels can be an issue and give some cam walk for sure.

 

[Fire-medic]

Yes, it went into the coolant jacket, and there was similar perforation on the adjoining cyl. Those two cyl's also had low compression.

Yes, the cams were not secured as-well as they should be, especially in an engine being used for racing. Repairs underway.

Unless the pit went all the way through into the coolant or other area I don't expect that would have been much of an issue? The missing dowels can be an issue and give some cam walk for sure.

 

[The Beekeeper]

Which is more cost effective?...............Sleeving the cylinders or findind/prepping another good used block?......................Tom.

 

[42Below]

I saw a head on a new Ford Falcon 4.0L 6cyl once with a hole clean through to the cooling system. That was in the 1990s though.....
It does happen but I agree it shouldnt these days.