V6 Chevy 90 degree engines
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All the Chevy V6 90 degree engines share the same firing order of 1-6-5-4-3-2. The two smaller engines, the 200 cid and 229 cid, have what is called a "semi-even fire" sequence which alternates between 132º and 108º. This comes about due to the "slipped disc" crank pins; each pair of rods are offset by 18º. The design of the crank required the connecting rods to have 0.050" narrower ends to fit onto the available rod journal space due to the material added to the cranks for strength. | All the Chevy V6 90 degree engines share the same firing order of 1-6-5-4-3-2. The two smaller engines, the 200 cid and 229 cid, have what is called a "semi-even fire" sequence which alternates between 132º and 108º. This comes about due to the "slipped disc" crank pins; each pair of rods are offset by 18º. The design of the crank required the connecting rods to have 0.050" narrower ends to fit onto the available rod journal space due to the material added to the cranks for strength. | ||
| − | The cam and distributors are specific to the 200/229 cid engines and they cannot be interchanged with the 4.3L V6 engine. Distributor bodies used on the V6-90 are identical to the one used for the Chevrolet small-block V8 except for the pickup coil and pole piece assembly. The main difference between the semi-even fire series (200/229) and 4.3L distributors is the 4.3L distributor pickup coil and reluctor wheel has six equal points every | + | The cam and distributors are specific to the 200/229 cid engines and they cannot be interchanged with the 4.3L V6 engine. Distributor bodies used on the V6-90 are identical to the one used for the Chevrolet small-block V8 except for the pickup coil and pole piece assembly. The main difference between the semi-even fire series (200/229) and 4.3L distributors is the 4.3L distributor pickup coil and reluctor wheel has six equal points, one every 60 degrees (6 x 60 degrees = 360 degrees). Also, a majority of the distributors used on the 4.3L has a small distributor cap, same as used on the 2.8L V6 60 degree engine. The small cap/external coil ignition system is commonly used with the TBI and CPI motors. The 1985-'86 4.3L engine used in Chevrolet trucks, vans (including the Astro/Safari) used the traditional large-cap HEI on the RPO LB1 motor. Marine applications used a unique small-capped distributor not interchangeable with those used in automobiles. |
==Intake manifolds== | ==Intake manifolds== | ||
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