by 1972nail » Fri Jan 27, 2017 9:27 pm
Yep, as Mike says P16's can be fitted to OHC uprights without modification. They are ideally suited to the thicker HPF discs but I've successfully fitted them with standard Magnum discs. The OHV caliper mounting is different to the OHC so you need the OHC upright to fit OHC calipers. OHC disks can be fitted to OHV hubs as the hubs are the same but you'll need a caliper upgrade to suit the bigger diameter. I have a vague recollection that Metro calipers may be able to be adapted to fit OHV uprights but I've no experience of that route.
I believe some Renault vented disks can be easily modified to fit the hubs but are the same diameter as OHC discs so will not improve braking power but will improve heat dissipation in a race type high frequency or prolonged braking situation. I suppose that was the thinking behind the thicker HPF discs, improved heat dissipation.
So, if you have OHC uprights then P16 calipers are a very useful upgrade. Adding modified M16 pads to the P16's gives a further 15% improvement in braking pad swept area....more grabbing power.
Some people have fitted the later M16 caliper (metric) but the mounting holes in the caliper are metric and slightly bigger and you risk the caliper moving on the mounts and possibly shearing the bolts after prolonged use. I've read reports from competition car owners who have not had any problems with caliper movement with M16 on standard bolts after many miles.
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"When you have a Firenza like mine, who needs any Minis?" copyright David Maxwell 1979.