This week has been engine week. It's currently laying in the garage in bits, ready for rebuild over the next couple of weeks.
As for the engine, externally it looks worse for the wear. It leaked oil for fun from most places it could leak, and the core plugs also leaked water.
Internally though, exceptional condition. It hasn't been rebored in the past, nor does it need doing now, and the shells are in near excellent condition. A nice surprise! This isn't an excuse to get out of replacing them though. ALL shells are being replaced, as are the complete piston ring set because one was snapped.
The water pump is going to go through a rebuild using a kit I've purchased off eBay. Most of the bits I've got in fact have been off eBay, and sold for the standard X-Flow engine. Mightly cheaper than putting the word Lotus in front.
To give you an idea, I paid about £14 for the Vandervell shells. From a Lotus dealer these are around £80 or more. Crazy.
The piston rings were highly upsetting. I found it hard to find an equivalent, and I have since learned that different brands of pistons were used. In the end I bailed and used Paul Matty's advice to get the right ones. Cost me £120 mind you!
For what it is worth, I now know the equivalents for most of the parts on the engine (clutch, shells, piston rings, etc) so if someone needs some advice, feel free to PM me.