damn. I'd hoped you were going to blindside me with a "oh they just need this" They are being challenging and saying things like 'oh nobody else has ever had this problem" Sigh. A job for the next decade I think!
Happy New Year all!
I don't specifically know the difference between GL4 and GL5, though I do know that GL5 is not recommended for drive systems which contain 'yellow' metals. Lots of the MG differentials have brass/phospor bronze thrust plates in the diff, and apparently some of the additves in GL5 eats them...
Now that air con idea is an interesting idea. I have an Eaton M45 in the shed (which is probably a bit small). The air con system sounds like a much improved air/water intercooler. I'll have a dig about! EFI is on the list an any case.
collector is from a Rover K series manifold. MGF/MGTF/Rover 200, 400, 25, 45, 75. About 20 quid off eBay, buy the whole manifold and you get loads of weirdy little bends as well, some of which are useful! Yes, it's a lambda boss, going to be used in the future. They are quite nice...
I've made another manifold (well, half made it)
There is not much space on this (the Driver's side) because there's a clutch master cylinder in the way, and a lot of engine mounts and starter motors and all sorts.
Still, this just about fits.
It's the only car I've ever come across that does drain the oil cooler into the sump. It's a lot more efficient (in terms of cooling) to force the hot oil through a cooler then straight into the engine than to return it to the sump.