Thread: Differences in 2 Litre Engines

hi Garry

I think the most obvious is the oil filter cannister on the 1955 onwards 'spead bore' motors ..One of the major internal changes was: they changed to modern copper backed type main and big end bearings .. which means a full flow oil filter was fitted for better filtration.

They also changed the piston gudgeon pin diameter .. larger , but I'm not sure at what number . The 1970's Series 3 6 cyl. pistons will fit in your late S1 motor .. with the larger gudgeon pins. Apparently it raises compression slightly as a bonus.

Another one is the removeable ring gear on the flywheel...on the later motors.

Mike

Thanks Mike - on checking the engine number of my station wagon I find it is the earlier 2 litre instead of the later engine. Also confirmed through Diana's help who was able to give me the engine number that the car was built with.

Mine does not have an oil filter. I did suspect something was not correct as the air filter which was in the back was off an earlier model.

So if anyone has a complete late model 2 litre petrol engine lying around that is real cheap let me know.

Cheers

Garry

Garry

Mike has mentioned the basic issues, however there are a couple of important ones he skimmed over.

The change in oil filter was a change from a low pressure bypass filter where only some of the oil was filtered in each cycle. The later engines had a full flow system where all the oil passed through the filter each cycle. This adds to engine longevity.

The main issue was the spacing of the front and rear cylinders was increased so that there was better cooling between the cylinders. This vastly reduced the frequency of blown head gasket between the cylinder pairs.

Going back to your vehicles, I know that you don't want to cannibalise the other vehicle, however why don't you consider borrowing the engine until such time as you can acquire a spreadbore replacement, and do any work needed prior to fitting it to the SW.

Diana