0 views
Share this clip
Know someone who'd love this clip?
Share it with friends and fellow fans.
Share this clip
Know someone who'd love this clip?
Share it with friends and fellow fans.
Welcome back to our next series of dyno tests with our L8T To The Party crate engine project! Last month Brian Tooley Racing put this engine on their dyno to see what kind of power it could make with different camshafts and intake manifolds. The L8T crate engine comes from Chevrolet Performance as a completely stock 6.6-liter engine, straight from the production line. While GM built this as their entry-level gasoline-powered workhorse, this iron block V8 benefits from direct-injection, variable valve timing, and a healthy 400 cubic inches of displacement. So what happens when we up the game with our L8T dyno shootout with a pair of CNC-ported cylinder heads to go with the camshaft and intake changes? Even though it was built to be used and abused in heavy-duty Silverado and Sierra pickups while running on 87-octane and being emissions-friendly, the L8T is factory-rated at 401 horsepower and 464 pound-feet of torque. One horsepower per cube out of a factory work truck engine is what makes this 6.6 appealing to hot rodders. What is more appealing is that it responds to tuning and modifications like its 5.3 and 6.2 baby brothers. At the beginning of our L8T dyno testing, ours made 500 horsepower at 5,100 rpm and 580 pound-feet of torque at 3,900 rpm with nothing more than a set of 1 7/8-inch dyno headers and a change to E85 fuel in the dyno cell. At the end of our L8T camshaft shootout, the 6.6-liter crate engine cranked out 650 horsepower at 6,800 rpm and 554 pound-feet of torque at 5,400 rpm with BTR’s 230 cam and a Trinity mid-length intake manifold while still sporting the stock bottom end and cylinder heads. The cam’s duration is 230 and 24x degrees on the intake and exhaust, 0.644 inches of lift on both the intake and exhaust lobes and a lobe separation angle of 112 degrees. We suspected that some ported heads would be exactly what the BTR 230 cam wanted, and now it’s time to find out! The final pull on our max effort naturally aspirated L8T dyno session with CID’s Gen-V LT cylinder heads came to 723 horsepower at 7,400 rpm and 598 pound-feet of torque at 5,400 rpm. It should be no surprise that the small bump in compression and the slightly higher flow at higher valve lifts helped it edge out the GPI heads in the higher rev range. What’s impressive is that both runs retained VVT, direct injection, and a hydraulic-roller valvetrain. The Gen-V LT engine platform from GM is more than proving its worth with gains like these. In the past, if you wanted a streetable and reliable 700-plus horsepower V8, it required either big cubic inches from a big block, a power-adder, or both. Now you can get that performance with the reliability and street manners of a high-performance daily driver in a small package. We’re done with the naturally aspirated L8T dyno testing, so the next time you see our 6.6 on the dyno, we will finally dig into the bottom end to build this into a four-digit horsepower screamer that can handle big boost! #LSX #L8T #engine #engines #dyno
Chevrolet is an American automobile division of the manufacturer General Motors (GM). In North America, Chevrolet produces and sells a wide range of vehicles, from subcompact automobiles to medium-duty commercial trucks. Due to the prominence and name recognition of Chevrolet as one of General Motors' global marques, "Chevrolet" or its affectionate nickname Chevy is used at times as a synonym for General Motors or its products, one example being the GM LS1 engine, commonly known by the name or a...
More about Chevrolet→Added