Since I haven't looked at oil coolers for so long I'll have to dig around on the net to see what's out there after 25 years.
I didn't like the looks of the big bare rad type ones mounted on the front of the bike. My 1st attempt at cooling the oil was done by cutting a vent in the right side cover so air would pass between the cover and the oil tank. My bikes in a corner against the wall so I could only get a shot of it from the inside looking out.
I never did any testing back then to see what effect it had on the oil temp but I'm sure it did something on the hiway.
On my 750 I scavenged a water pump cooler off a car in a junk yard and fashioned a scoop for it and then tucked it behind the oil tank but still sticking out a bit to catch the wind. I was able to get a shot of it but not from a good angle. You don't usually look into it so much and man is it ratty looking after sitting 25 years.
I've never tested this one either to see what effect it had. When I start working on these bikes (soon I hope) I may try to clean it up and use it again as some of the prices I just saw after a quick look on the net were pretty scary. I should fit an inline thermostat though.
Has anyone else seen a nice looking and/or good functioning oil cooler suitable for mounting on a Norton?