Technical Koalar random thoughts

[koalar]

Thought I post on here as the information on sealing rings is hard to come by

Oil filters

1.2

There's two types notice the engine number of the swap over

The early ones are longer,

A it the diameter
H is the length
C is the outer diameter of the sealing ring

Also notice the bypass pressure is also different (2.9 PSI)*

Counter intuitive the shorter filter has more volume

V ≈ 307.91 long
V ≈ 335.7 short

That because the radius is X3.14 so it has a larger effect than you think

That's not to say it holds more oil it depends how the space inside is filled

Also notice the bypass pressure has altered

I don't know why the filter was changed, proximity to the exhaust, just a stupid guess, But I don't see it as a down grade

There are other filters from the fiat range that also fit

 

[jrkitching]

Also notice the bypass pressure has altered

I don't know why the filter was changed

Again, just a guess - but Fiat have also changed oil specs over the production run. Perhaps changing the viscosity of the recommended oil might be the reason for the change in bypass pressure?

Fortunately the 1.2 unit, at least in non-VVT form, isn't an oil sensitive design, nor is it highly stressed; so long as it's got a quantity of something resembling engine oil between the min and max lines on the dipstick and a filter that doesn't leak, it's likely to outlast the rest of the car.