Dr. Moulton at MGF, MGF Trophy and the MY1990 onwards, + Metro/100
See aswell http://www.mgf.ultimatemg.com/group2/suspension/hydragas.htm

Car type and location Diameter metal cover D1 D2 D3 H1 H2 H3 H4 axle load
MGF front
75,5 mm 26 mm 34 mm 60 mm 4 mm 37 mm 43 mm 56 mm app 480 kg
MGF rear
69 mm 26 mm 33 mm 59 mm 4 mm 24 mm 32 mm 67 mm app 720 kg

MGF Trophy front

76 mm 26 mm 33 mm 59,8 mm 4 mm 37 mm 43 mm 49 mm app 480 kg
MGF Trophy rear
69 mm 26 mm 33 mm 58 mm 4 mm 22 mm 29 mm 60 mm app 720 kg
Metro front (1990 on)
67 mm 25 mm 33 mm 52 mm 6 mm 20 mm 28 mm 68 mm 420 ? kg
NAM9533 for 155 tyres                  
NAM9534 (LHD & 185 tyres)
68 mm 
tx Ariel /NAS Sport :)
21.9mm  33 mm 59 mm  4 mm 21.8 mm  28 mm 49.5mm 389 ? kg

NAM4763 ? (suspect Metro)

MGF Trophy unit is the same body as standard MGF, just the measure H4 at the cone is 7mm shorter

The cone easy pops out with some air pressure to the lower sphere.

(Battery compressor 11.5 Bar used and the interconnection joint, MGR tool 18G1743

Metro frontMGF rearview to the piston

short ond measured locations.
Accuracy of above measures may be +/- 0.5mm


See the different shape of the metal cover (D metal cover)
Looks like the more load, the smaller is the lower diameter.

The ally piston shape reffers as well to the load.
Low weight on the axle means less diameter, but longer height.
All pistons nearly have the same lenghth overall.
Front Metro and front MGF sheet metal shape is nearly equal form, but the MGF open diameter is much wider.
  See dpr-racing site for more about Metro HG mods
Hydragas Mini world Magazine article
research on Hydragas Suspension
blown hydragasunit at my early MGF
the second blew
The pump
Cut displacer unit (MGF)
Metro racing Mods
metropower.co.uk lowering a Metro guide

back or to my MGF home site www.MGFcar.de

© 2004 - 2018 Dieter Koennecke

MG Car Club