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The Group 1 engines were the smallest in displacement and outer dimensions, and differed most significantly from the larger Group 2 and Group 3 engines by having only four main bearings (whereas the Group 2 and 3 engines had seven) [1]: 15 and a different firing order (1-5-3-6-2-4, whereas the others are 1-4-2-6-3-5).
1969 Chevrolet 302 cu in Z/28 engine showing factory cowl-induction system. In 1966, General Motors designed a special 302 cu in (4.9 L) engine for the production Z/28 Camaro in order for it to meet the Sports Car Club of America Trans-Am Series road racing rules limiting engine displacement to 305 cu in (5.0 L) from 1967 to 1969. It was the ...
The 351W had larger main bearing caps, thicker and longer connecting rods, and a distinct firing order (1-3-7-2-6-5-4-8 versus the usual 1-5-4-2-6-3-7-8, a means to move the unacceptable "noise" of the consecutively-firing adjacent front cylinders to the sturdier rear part of the engine block all while reducing excessive main bearing load ...
The firing order reduced the problem to an acceptable level - was nothing to do with crankshaft stress or strength. Secondly, for the 1981 car model year (October 1980), Ford changed the crankshaft of the 302ci/5.0L to a lighter weight version and altered the amounts of external balance from 29 ounce-inch to 34 at the front and 50 at the rear.
Dubbed EcoTec3, the 4.3 L (260 cu in) is a Generation V small block V6 truck engine. It gets its displacement from bore and stroke of 99.6 mm × 92 mm (3.921 in × 3.622 in) with a compression ratio of 11.0 to 1. Firing order is 1-6-5-4-3-2. [85] This engine replaces the unrelated 4.3L V6 whose lineage dates back to 1978.
This engine had seven main bearings, and can be identified by the five core plugs on the side of the block. The block uses a low-mount starter and six bellhousing bolts, sharing its bellhousing pattern with the 302 and 351 Windsor V8s, late (1965–68) 289, early 4.6 L V8, and the 240 and 300 inline-six. Production of the 250 ended in 1980.
The Ford "385" series engines--the "C" or Cleveland, and the "M" or Modified Cleveland, in all displacements (302 Boss, 351M & C and 400M) all used the same firing order as the little 302W. They were structurally much larger, beefier (and heavier) engines.
For this inline-4 engine, 1-3-4-2 could be a valid firing order. The firing order of an internal combustion engine is the sequence of ignition for the cylinders. In a spark ignition (e.g. gasoline/petrol) engine, the firing order corresponds to the order in which the spark plugs are operated. In a diesel engine, the firing order corresponds to ...
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