The Plus 4 is the lowest car of the whole series simply because of the tyre profile used. Just because of the tyre profile the car is 16mm lower than the 4/4.

Add to this problem the fact that your car was produced at a time when Morgan had a batch of poor quality springs that sagged before they even left the factory the chances are that you have only about 90mm of ground clearance under the gearbox crossmember. Given that many older speed humps were supposed to be 90mm high (now the standard is supposed to be 80mm) but have a tolerance of 10mm it is not unusual to find speed humps that are close to 100mm high so you are bound to ground out now and then.

There are various solutions including fitting 4 seater springs, which, for me, would give a ride too rigid. This is why I fitted the 5 link rear suspension.

If your car is on the original tyres it is time to consider replacing them (just for the age) and I would recommend that you consider 195/65 R15 tyres. This, of course, only applies if you have the 15" wheels smile and do not do track days (so want the car as low as possible). Using the 65 profile tyres instead of the standard 60 profile tyres will give you another 10mm of ground clearance.

Peter

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