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Two New Meadows Engines
Page 85
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TO be known as the 6EV and 6EW, two new engines have just been introduced by Henry Meadows, Ltd., of Fallings Park, Wolverhampton. Those units are almost identical except for a
difference of 5.mm. in the bore. In both cases the stroke is 130 ram., but whilst type 6EV has a bore of 90 mm. the other model has 95 ram. cylinders ; the capacities are therefore 4,962 c.c. and 5,528 c.c. respectively, as there are six cylinders. At 1,000 r.p.m. 38 b.h.p. is claimed for the smaller unit and 42 b.h.p. Tor the larger one ; at 2,000 r.p.m. the figures are 70 b.h.p. and 77 b.h.p.
In general, the two engines resemble the well-known &litre type, 13EX. Amongst the most notable differences, however, is the use of one double-roller chain to drive the camshaft, the dynamo and water pump in tandem, the ignition apparatus and the fan. A friction clutch is ineorporated in the drive for the last-mentioned component and a Hans Renold spring-loaded jockey sprocket automatically adjusts the chain tension.
A Gear-type Pump.
Lubrication:is effected by means of a duplex gear-type pump.One pump delivers oil to the main bearings and through a drilled crankshaft to the bigends ; the cylinder walls and small-end bearings are lubricated by splash. The other pump feeds oil to the camshaft and to the oil cooler, if such be fitted ; it also forces oil to the overhead-valve gear, but a small Best and Lloyd motorcycle-type adjustable pnmp.ia interposed as a regulator. The oil which passes this pump is fed into the overhead rocker shaft in which radial holes lead to each rocker bearing. Each rocker is also drilled so that oil shall reach the ball-and-socket bearings at the end of each arm. On the valve-stem end there is a hardened-Steel cap and on this bears a steel hall with ore flat face, the rocker arm being cupped to receive this ball.
An Auto-Klean oil filter is included in the lubrication system, and the operating arm by which this is cleaned is connected to the clutch pedal so that the filter is always kept clear. Near its base there is a large inspection plate through which sludge may. be removed. Another interesting feature is an arrangement whereby • the oil pros• sure is varied in accordance with the throttle opening. This consists of an adjustment for the relief valve so that the latter " blows 7 at about 20 lb. per sq. in. when the throttle is nearly closed, but allows the oil pressure to rise to some SO lb. per sq. in. on full load.
Provision is made for the use of magneto or coil ignition, or both. There are, in fact, two plug-holes per cylinder, and it is therefore possible to have two entirely separate and complete ignition systems. Both the magneto and the coil distributor are driven through an automatic advance-and-retard mechanism, which is unusually large and robust. Moreover, it provides a timing range some 50 per cent. greater than that usually -available with automatic devices for this purpose.
In the standard induction system a horizontal carburetter is placed on the near side and the mixture passes through a passage in the head and thence along a manifold on the off side. This is formed partly in the head block, and is completed by an aluminium casting which incorporates a water jacket at the junction with the cross passage from the carburetter. In an alternative but somewhat similar arrangement a vertical carburetter is used, and there is a third scheme iii which two horizontal instruments are attached on the off side. This last scheme results in a distinct increase in power at high speeds. Whichever induction system be used, fuel is fed to it by means of a mechanical pump.
A noteworthy feature of the exhaust Rystem is that the 'front three 'cylinders discharge into one passage and the other three into a second passage which joins
To the first a little' distance from the ports.
secsi.sseras Turning to the .clutch and gearbox,
which form a unit with either of these engines, two models are available. The clutch is of the single-Plate Me with unusually wide friction linings. The flywheel itself is spigoted on to the 'crankshaft, and the six bolts which hold it in position are carefully " fitted in their holes. Pressure -is applied to the friction surfaces by -means of 12 equally spaced springs giving a force of some 1,500 lb.
Four-speed Gearbox.
Each of these engines is supplied with a type-9 four-speed gearbox in the ordinary way, but a heavier box, the type 10, can be supplied with the larger engine. In the former case, the ratios provided are 8.23 to 1 in reverse.. 5.27 in first gear, 2.63 in second, 1.70 in third and direct drive on top. The type-10 gearbox, however, gives rather closer ratios, viz., 5.51 in reverse, 4.41 in first gear, 2.72 in second, 1.62 in third and direct drive again, of course, in top gear. In the lighter gearbox, sixpitch gears are used, the face width
being in. or 1-g in., but in the type10 box the width is 11 ins, or 1 ins. with the teeth of five pitch.
AS to the disposition of the gear control, there is a wide choice; for this can be arranged for forward or rearward driving positions, and at the side or central normal-control chassis.
There two units are arranged to include an electric starting motor of the usual type; and there is room for a dynamo as large as 8 ins, in diameter, able to cope with the most generous standard of lighting.