There’s much to cover, so let’s get started. With all that as a preface, we’ve compiled a reference guide to all of the LT production engines, with their basic specs and unique attributes, from the surprisingly strong V-6 engine in 1/2-ton trucks to the supercharged LT5, along with the LT2 in the mid-engine C8 Corvette, the long-stroke L8T truck engine, and everything in between. The precise fuel control with direct injection enables the engine’s higher compression ratios, which boost horsepower. It is done with extremely high fuel pressure of more than 2,000 psi-and closer to 2,900 psi for the supercharged versions. All versions are cast aluminum, using a semi-permanent mold process that produces a more accurate casting for optimal mass reduction and minimal machining.Īlthough sizes vary among the variants, LT combustion chambers are generally smaller than LS chambers to accommodate the volume of dished piston heads that are crucial for directed fuel spray from the injectors, while also contributing to generally higher compression ratios of up to 11.5:1 on some engines.Īs for the direct injection system, it introduces fuel directly into the combustion chamber rather than into the cylinder head ports, per a conventional port-injection system. The LT cylinder head design builds on the excellent airflow attributes of previous LS family designs and matches it with a direct-injection combustion system. The L8T has a cast-iron block (see sidebar on page xx).
By the way: All of the LT blocks except the new L8T heavy-duty truck engine are cast aluminum. Like the LS architecture, the LT block is a deep-skirt design with six-bolt main caps with built-in provisions for jet-spray piston cooling, as well as accommodations for an engine-driven vacuum pump and the engine-driven high-pressure fuel pump for the direct injection system. It’s the thread that links them all, even though the bore and stroke specs vary among different variants-with displacements limited to 4.3-, 5.3-, 6.2L, and, most recently, 6.6L, for the new heavy-duty truck gas engine. Like every small-block generation before it, the Gen V cylinder block shares a 90-degree cylinder angle and 4.400-inch bore centers.
#Lt2 intake manifold pro
With the proliferation of LT engines increasing in production vehicles and as swap material for hot rods, trucks, and Pro Touring machines, it’s worth stepping back for a moment to survey the landscape to discuss the engines out there and where they fit in the LT hierarchy. There are essentially no interchangeable parts between the LS and LT families and all LT engines feature direct fuel injection. While there is a lineage from LS to LT, the two branches of the small-block tree are significantly varied. The LT engine architecture has its roots in the LS family that established unprecedented performance benchmarks and reinvigorated hot rodding, with the same sort of fundamental shift that could be attributed to the original small-block.
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