Boring (!) matters - 2200 out of 2000

They would be dry liners because you don't see the liner when you remove a sideplate. (And if you did there would be virtually nothing holding the block in one piece)



Edited By harveyp6 on 1191763661
 
According to the Haynes book of lies (page 18), there are no liners, the bores are machined in the block, what we think are liners are probably either the marks left by the head gasket, or sealing rings machined into the top of the block.
Which of course means you can over bore them.
 
Richard,
That is our belief. Marks, not liners.
Our understanding is that steel liners were used with aluminium blocks. That was not necessary with poured steel blocks.

Eric
 
The block are not linered from the factory, thats not to say it could have had liners fitted because it had reached max overbore.
 
I've been rummaging through my collection of old workshop manuals and i found an Autobook for the Rover 2000/2200,..Chapter 1.1 Description,2nd paragraph,The 2200 engine is virtually the same as the 2000 apart from a small increase in the bore dimensions, i know the section drawings in the Haynes and official Rover manuals appear the be minus any form of liner,i'm wondering wether the block was modified at the pre production stage and the original design drawings were printed in the manual??... i've taken a close up pic from inside the block and it's apparent that there is some form of liner present,...
 
That also looks like a machining process when the bores were cleaned up after the casting process.

Pretty sure there's no liner in a 2000 block.

Eric
 
That certainly clears things up...

However, the walls in the picture look rather thin to me...
Anyway, i will wait for more details from Canada...

Demetris
 
I will admit to knowing little about machining practices......However when I did my rebuild, I had the block tank cleaned. Now looking inside the block without the side plates, the exterior of those bores is smooth...(as if a liner).
Is this possible in a cast block?
Just asking....

Dick West
 
To clarify a little - there are a number of reasons a manufacturer might want to use a liner. Most obvious is to make it easier to cast the block by creating lots of big spaces inside the casting to allow core feeders etc. "Wet" liners would then be inserted to complete the structure. This can be quite dramatic, for instance in the Hillman Imp engine the block has no top at all and the liners seal directly to the head rather than to the block - which is why DIY mechanics tended to wreck the engines..... More normally the outside of the liners are direct into the coolant space - hence "wet" liners. Another reason is if the manufacturer wants the piston to run against a particular grade of iron or steel that would make casting the whole block out of the same material either very expensive or very difficult (not all steels and irons are equally easy to cast - its a bit like differing cake mixes really). An extreme example is where the block is cast in Aluminium. It's even possible to use a forged liner in a cast block, in theory giving the liner much more homogenius properties. A "dry" liner is therfore a liner that is shrunk into a complete liner shaped (ususally machined first) space in the block and has its outer faces butted up against the metal of the block rather than the coolant space.

Of course, that doesn't particularely get us much further forward as I don't know very much about the specifics of the 4 cylinder blocks!

Chris
 
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