Metro challenge info and specs?
Turbo Mini Forums

Evening guys.... i know a few of you on here are metro challenge fans. So thought this is best place to ask..

Spoke to a random guy today who said he was heavily involved with them back in the day and has an old engine that he may be selling.. we swapped numbers and am awaiting to hear from him, so thought id ask what the specs were whilst im waiting.

Thanks.

Look the regs up online, that will tell you what it "should" be.

If something is worth doing, it's worth doing half of.

5.7a.1.2 MG Metro Turbo It is permitted to modify the cylinder head combustion chamber, inlet and exhaust ports but standard inlet manifold locating rings (nominal outer diameter 34mm) must be retained. The maximum permitted compression ratio is 8.65:1. Modifications to the cylinder head and block to regulate coolant flow are permitted. The maximum permissible piston diameter is standard production plus 0.020”. A Rover CAM 6648 camshaft is mandatory. Maximum valve lift is 10.92mm (0.430") with a valve clearance of 0.4mm (0.016”). Rocker assembly is unrestricted.
Page 14Standard production inlet and exhaust valves must remain with the following diameters: Inlet 35.58mm Exhaust 29.45mm Crankshaft STR 931 or standard production tuftrided (STR 0040) are also permitted. The crankshaft may be lightened. It is permitted to lighten and/or balance the connecting rods. It is permitted to machine a small groove 1mm wide and 0.5mm deep on both sides of the con-rod above the top bearing and/or modify the main oil gallery to allow a jet of oil to be sprayed into the piston crown to aid cooling. The crankshaft and connecting rods can be chemically or heat-treated.

other stuff here


http://mgmetrocup.co.uk/MGMCRegs.pdf

More mods allowed than I thought!

If something is worth doing, it's worth doing half of.

So info is slowly being received..

The engine plate has the i.d 'RX-1'

Anyone seen this before or know if its any builders markings?

And that the box is straight cut.

Awaiting some pics 🙄