Differences in 2 Litre Engines

[101RRS]

There are two 2 litre series 1 petrol engines, the early engine with cylinders close together and the later engine with a little more meat between the engines.

I know there are various internal differences such as a better rear main oil seal and better oil filtration on the later model but looking at the engines externally, what are the visual differences between the engines other than engine numbers.

Cheers

Garry

[series1buff]

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

[101RRS]

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

[Lotz-A-Landies]

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

[101RRS]

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

The other engine, while it runs well will need as a minimum rings and valve seals as it is a major polluter from start up. Plus it will be some time before I actually start major work and I am in the stage of researching what I need to do and where to locate those special bits that I might need. Just looking at options.

Anyway if all else fails I have a spare jag V12 in the backyard that I could put in .

Will see what eventuates

Interesting the rego sticker on the SW indicates that it still had its original engine when still on the road. To have replaced the engine when the car was a paddock basher must have been a result of a major failure rather than a gradual wearing out of the engine - why else change the engine with an even older engine.

Garry