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Hewland Type Reference The First Thirty Years Prepared with the cooperation of Hewland Engineering Limited. |
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| Type | Year | Rating | Weight | Description |
|---|---|---|---|---|
| MkI | 1960 | up to 1500cc | ? | The first of the VW-based small-displacement gearboxes, slight modification of the VW, differed from the production Mk3, 12 made for Lola only |
| MkII | 1961 | up to 1500cc | ? | Used by Elva, with more modifications |
| MkIII | 1962 | up to 1500cc | 70 lb. | The definitive production VW-based box, tail shifter, VW diff and sideplates, VW bearing carrier, now with Hewland quick-change gears, five forward speeds, splash lubrication. More widely available. |
| MkIV | 1963 | up to 1500cc | 70 lb. | The second generation VW-based 'box, GKN (Ford Zephr) diff, Hewland side plates and bearing carrier with forward facing shifter, diff still in ball bearings, sideplate ears offset to front or rear. The gearbox that really launched Hewland Engineering. |
| MkV | 1963 | 1600cc, high torque | 75 lb. | A "heavy duty" variant of the VW-based series, designed for low RPM, high torque engines, such as the Lotus twincam, utilized special thicker gears and layshaft |
| H.D. | 1963 | 1.5 to 3.5 litres 400 ft. lbs. (4 spd) 300 ft.lbs. (5 spd) | 85 lb. | The first complete Hewland design featuring a proprietary case, for F1 and big bore sports racers, cam and pawl LSD, 4 or 5 speed, first used on Brabhams with 2.7 Climaxes for Tasman |
| LG 500 | 1966 | 300-450 cu.in. | 136 lb. | "large gearbox", the largest Hewland transaxle to this time, this model a 4 speed, LG's were ultimately available with 2, 4, or 5 speeds, the first being for Indy cars, mainstay for Can Am and Formula 5000, limited slip cam and pawl or "Power-Lok" multi-plate, internal oil pump, distinctive upper right linkage, "two-man 'box" |
| Mk VI | 1965 | up to 1500cc | 75 lb. | virtually identical to MkIV with varying sideplates for different manufacturers, sometimes license built by manufacturers |
| Mk VII | 1968/9 | ? | ? lb. | very rare 6-speed version of Mk IV for 1000cc F2 |
| FT 200 | 1966 | 2.5 litres, 200lbs./ft. | 84-90 lb.(41 kg.) | An all-new, completely Hewland design for intermediate power levels, Formula 2/B/Atlantic, 2 litre sports cars, 5 speeds, oil pump optional |
| Mark 8 | 1968 | 1.5 litres, 150 lbs./ft. | 70 lb. | The third generation of VW-based small-bore transaxle, proprietary ring and pinions replace VW ones, larger open diff riding in tapered roller bearings, new gear hub system with all hubs splined to pinion shaft, 4 or 5 speed with open diff or LSD, sideplate ears centered, only the case is VW |
| DG 300 | 1969? | 4.5 litres, 350 lbs./ft. | 53 kg. | "different gearbox", 5 speed intermediate load range transaxle with LG cam and pawl limited slip, oil pump, low right shifter, evergreen unit for F1/Sports cars |
| FG 400 | 1968 | 280 lbs./ft. | 110 lb. | "effing gearbox?", 5 speed transaxle used in Formula 1 first half of DFV era, many FT internals including gears with larger DG/LG final drive parts in unique case |
| LG 600 | 1968 | 300-450 cu.in. | 145 lb. | five speed version of LG 500 using longer bearing carrier, Formula 5000, Can Am |
| FGA | 1972 | 280 lbs./ft. | 110 lb. | Development version of Formula 1 FG 400, second half of DFV era, six speed version also |
| LG 2 | 1972? | 300-450 cu.in. | ? lb. | 2 speed Indy variant of LG 'box with special gears |
| LG Mk II | 1972? | 300-450 cu.in. | ? lb. | special Indy 4 or 5 speed version of LG with different case, selector rod, and diff |
| DG 300 Mark 2 | 1972? | 4.5 litres | 118 lb. | development version of DG, differences? |
| Mark 9 | 1973 | 1.5 litres | 70 lb. | final evolution of VW-cased small bore 'box, Mark 8 with inboard brake sideplates, double row output shaft bearings, Spicer shafts only, no more donuts |
| FGB | 1978 | 260 lbs./ft. | 112 lb. (47kg.) | Development of FG 400/FGA Formula 1 'box for early turbo era, beefier main case to take larger crown wheel and pinion (lower ratio for higher revving engines), limited slip in common with DGB |
| DGB | 1981 | 440 lbs./ft. | 61 kg. | Sportscar endurance box, full oil system, strong case |
| VG | 1981 | 600 lbs./ft. | 76 kg. | As DGB concept but bigger |
| LD 200 | 1988 | 150 lbs/ft 140 hp | 63 lb.(31kg.) | The replacement for the venerable Mark series, current 'box for Formula Ford, other entry level formulas, squarish aluminum main case with one integral sideplate, o-rings on rear carrier and cover! |
Dear Bill,
It has taken some time and I cannot guarantee 100% accuracy, but here is the list of Hewland historic
gearboxes.
They were all "publicly available". Not included are the many specialised bespoke projects that were
undertaken for
customers.
The enormous amount of new transmissions (mainly bespoke) that have been designed since the early 1990's would make this list tenfold in length so this is the "first thirty years" of Hewland Engineering.
Best Regards,
William Hewland
