MPL G50 and 7R Engine Options

Standard G50 Engine

All parts manufactured to 1962 specification with the aid of AMC factory drawings. Aluminium alloy crankcases fitted with alloy top hats line bored for perfect alignment. Needle roller drive side main bearings with oil seal, top quality timing side main bearings. The ultimate crankshaft assembly manufactured with larger integral mainshafts from EN36 forgings, pressed up 40mm needle roller big end. Carrillo con rod. Lightweight high compression Omega piston running in ceramic coated alloy bore. Big valve cylinder head with hard ‘lead free’ valve seats. Stainless valves controlled by coil springs with titanium collars running in Colsibro guides. Choice of camshaft profiles.

MPL G50 Standard Engine

Standard 7R Engine

All parts are based on 1962 design, manufactured with the aid of AMC factory drawings. However all our 7R engines feature the G50 style lubrication system with external cambox feed hose and drain through the timing cover. Consequently all our 7R barrels, heads and camboxes are minus the oilways present in original pre 1963 engines, although the bosses are included in the castings to allow these oilways to be added if required.

Our standard 7R engines feature magnesium crankcases fitted with alloy top hats line bored for perfect alignment. Needle roller drive side main bearings with oil seal, top quality timing side main bearings. The ultimate crankshaft assembly manufactured with larger integral mainshafts from EN36 forgings, pressed up 40mm needle roller big end. Carrillo con rod. Optional 1 piece Crankshaft. Lightweight high compression Omega piston. Cylinder head with hard ‘lead free’ valve seats. Stainless valves controlled by coil springs with titanium collars running in Colsibro guides. Choice of camshaft profiles.

MPL 7R Engine

95 Bore x 70.38 Stroke Ultra Short Stroke G50 Engine

Derived from our highly successful & reliable standard G50 engine, this engine is designed to give more power and faster acceleration with less weight, without sacrificing reliability. All parts are manufactured from original design castings.

Magnesium crankcases - unobtrusively strengthened. Big journal one piece crankshaft with custom designed lightweight Carrillo conrod. Special 2 ring Omega billet piston assembly running in a "Nikasil" ceramic bore in a shortened billet barrel. Alloy head casting with hard 'lead free' valve seats, developed inlet port to suit 44mm carb. Twin spark plugs (10mm), 'Colsibro' valve guides. Stainless valves, special valve springs & titanium valve retainers. High performance camshaft. No mechanical tacho facility. Lightweight metric fasteners throughout. Engine ¾" shorter than standard G50. 'Red line' = 8,800rpm.

81 Bore x 67.8 Stroke Ultra Short Stroke 7R Engine

The baby brother to the 95 bore G50, with a similar specification, this little beauty revs all the way to 9,200rpm.

Magnesium crankcases, one-piece crankshaft with custom designed lightweight Carrillo conrod, special 2 ring Omega billet piston running in Nikasil ceramic bore in shortened barrel. Alloy head casting with hard "lead free" valve seats, inlet port to suit 38 or 40mm carb. Twin spark plugs (10mm), "Colisbro" valve guides, stainless valves, special valve springs & titanium retainers. High performance camshaft - no mechanical tacho facility. Lightweight metric fasteners throughout. Engine ¾" shorter than standard 7R.

4 Valve G50

This 4 Valve DOHC engine takes the G50 to where surely AMC would have done if they had the type of facilities that we have at MPL. Externally virtually identical to a standard G50, we have squeezed a lot of extra parts in, in a way that is still confidential. All that our customers need to know is that it's a DOHC 95 bore engine, with significantly increase power and torque.

Magnesium or Aluminium crankcases, one piece EN40B crankshaft, choice of flywheel weights, custom Carillo conrod, special Omega billet piston running in a "Nikasil" ceramic bore in a billet barrel.

Head casting externally as original AMC, reworked internally to fit in a modern combustion chamber with a central 10mm spark plug, 4 valves and big inlet & exhaust ports in the original position. Cast magnesium cambox with 4 cams inside! Engine 3/8" shorter than a standard G50.

These 4 Valve top ends have proven to be totally reliable, revving to 10,000rpm

For G50 and 7R engine prices follow this link