Radiators. Series 2 vs Series 3

[davidsxj6 (David)]

@PeterCrespin

I’ve said the same thing (except the 2/3 vs 1/3 aspecf) several times on J-L when people dismiss the bypass system. Jag designed a positive displacement system adequate to feed 12 big ends, seven mains and the cams at idle. This inevitably means massive oversupply at high revs when you need the cooling most and the bypass works best. When cold they used the integral oil/water heat exchanger and filter to warm the oil via coolant on the first twelves (E-Types) and altered it on the sedans because the subframe got in the way of that packaging.

Kind of. Anyways, I have nothing to add to the topic so I‘ll leave it.

[Robert_Wilkinson]

Yes, I see now what you are talking about. The oil-to-coolant exchange used on the E’s (and used on an Audi I used to own) not only cools hot oil but warms up cold oil, allowing it to flow more efficiently. Didn’t know Jaguar ever did this.

[Aristides (Aristides Balanos)]

@davidsxj6

Doesn’t the V12 incorporate a oil to coolant heat exchanger that’s neat and complicated?

Yes, but for the Transmission fluid.
Neat and not that complicated.

[davidsxj6 (David)]

The 6 cyl cars with transmission cooler have the same tube, the earlier version is neater and has a drain.