Editing V6 Chevy 90 degree engines
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<br> | <br> | ||
+ | <pre> | ||
**4.3L V6 VIN CODE Z** | **4.3L V6 VIN CODE Z** | ||
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− | **4.3L V6 VIN CODE Z | + | **4.3L V6 VIN CODE Z Turbo** |
− | 1991 S15 | + | 1991 S15 & T15 |
1LD | 1LD | ||
− | 1992 T15 | + | 1992 S15 & T15 |
2LD | 2LD | ||
− | 1993 T15 | + | 1993 S15 & T15 |
3LD | 3LD | ||
+ | </pre> | ||
==Blocks== | ==Blocks== | ||
The Chevy 90º V6 is formed by the removal of the #3 and #6 cylinders of a SBC. All three V6 engines share the same 4.4" bore spacing and 9.025" deck height of the SBC engine. | The Chevy 90º V6 is formed by the removal of the #3 and #6 cylinders of a SBC. All three V6 engines share the same 4.4" bore spacing and 9.025" deck height of the SBC engine. | ||
− | Production 1992 4.3L engines with RPO L35 had modified cylinder blocks where a balance shaft | + | Production 1992 4.3L engines with RPO L35 had modified cylinder blocks where a balance shaft are used. The balance shaft are gear-driven off the front camshaft gear; camshafts for use with balance shaft motors have a longer dowel pin, which cannot be interchanged with non-balance shaft engines. The current engine block in production since 1995 eliminated the front and rear freeze plugs with extra strengthening ribs. The oil pan used was changed from stamped steel to an aluminum alloy casting. The engine block has 10 oil pan bolts, making the early and late oil pans incompatible. |
==Cylinder Heads== | ==Cylinder Heads== | ||
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==Displacements== | ==Displacements== | ||
There were three displacements of the Chevy V6: | There were three displacements of the Chevy V6: | ||
− | + | *200 cid (3.4L) cid, basically 3/4 of the lowly 267 cid V8. Made 1978–'79. | |
− | + | *229 cid (3.8L, not to be confused with the Buick-derived 3.8L 231 cid V6 used through the years), is 3/4 of the not-quite-as-bad 305 SBC V8. Made 1980-'84. | |
− | + | *4.3L (262 cid), the best of the bunch by far. This is 3/4 of the SBC 350 and as such, shares some of the parts and dimensions with the 350. Made 1985-present. The 1992 model year saw the use of balance shafts; all 1995-present 4.3s are balance shaft equipped. | |
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==Bore and stroke== | ==Bore and stroke== | ||
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All the Chevy V6 cranks are 3.48" stroke. There are major differences between the 200/229 engines and the 4.3L engine, though. | All the Chevy V6 cranks are 3.48" stroke. There are major differences between the 200/229 engines and the 4.3L engine, though. | ||
− | Scat | + | Scat makes a cast crank for the 4.3L engine, p/n 9-4.3L-3480-5700. It's for the 1-piece rear main seal engines. |
[[File:Even fire chevv6.jpg|thumb|350px|right|Production 4.3L even fire crank, arrows show split rod journals]][[File:Odd fire Chev v6crank.JPG|thumb|400px|left|Odd fire crank showing common rod journals]]<br style="clear:both"/> | [[File:Even fire chevv6.jpg|thumb|350px|right|Production 4.3L even fire crank, arrows show split rod journals]][[File:Odd fire Chev v6crank.JPG|thumb|400px|left|Odd fire crank showing common rod journals]]<br style="clear:both"/> | ||
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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, 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 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. |
− | + | Around the mid-2000s, the traditional distributor was eliminated where coil packs were phased in. | |
==Intake manifolds== | ==Intake manifolds== | ||
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[[File:OEM 4.3 L V6 Q-jet intake 1986-back.jpg|thumb|left|OEM 4.3 L V6 Q-jet intake 1986-back]] | [[File:OEM 4.3 L V6 Q-jet intake 1986-back.jpg|thumb|left|OEM 4.3 L V6 Q-jet intake 1986-back]] | ||
<br style="clear:both"/> | <br style="clear:both"/> | ||
− | The 1985 Astro van had this intake; passenger cars came standard with TBI fuel injection. Passenger cars (B- and G-body) as well as trucks/vans manufactured after the 1986 model year (including 1988- | + | The 1985 Astro van had this intake; passenger cars came standard with TBI fuel injection). Passenger cars (B- and G-body) as well as trucks/vans manufactured after the 1986 model year (including 1988-94 S-series trucks) came with TBI intakes. |
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===Marine intakes=== | ===Marine intakes=== | ||
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*[http://www.brodix.com/heads/v6heads.php Brodix heads] | *[http://www.brodix.com/heads/v6heads.php Brodix heads] | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:GM]] | [[Category:GM]] |