**LMR R&D on Supercharger and Cylinder Heads**
12-31-2014, 04:54 PM
#1
Supporting Vendor
Thread Starter
**LMR R&D on Supercharger and Cylinder Heads**
I am sure most of you have seen pics from magazines but thought I would share some in case some of you have not seen inside the LT4 platform. Here are some pics of Cylinder heads and supercharger.
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Current C7 World Record Holder 7.55 @ 184 MPH
Quickest and Fastest GEN5 LT Powered Vehicle
LMR1200HP Supercharged C7 8.84 @ 160
LMR1200HP Twin Turbo C7 9.35@155mph-2014
2 TIME OUTLAW DRAG RADIAL LSX CHAMPION 2008/2010
9.47 ZR1 Corvette-2009
LATE MODEL RACECRAFT
713-466-9900
LateModelRacecraft.com
Too many PMs, please call or email instead, thanks!
Last edited by Late Model Racecraft; 12-31-2014 at 05:15 PM.
01-05-2015, 06:25 PM
#6
Nice. Do they flow similar numbers to the lt1 heads on the flowbench?
01-05-2015, 11:14 PM
#7
Drifting
Camshaft
The LT1 and LT4 differ more dramatically in the valve-actuation attributes of their respective hydraulic roller camshafts. The naturally aspirated LT1 cam specs include 0.551/0.524-inch intake/exhaust lift, 200/207 degrees duration at 0.050-inch lift and a 116.5-degree lobe-separation angle (LSA).
The LT4’s camshaft, on the other hand, is designed to help process a much greater amount of airflow under boost, with a wider, 120-degree LSA that reduces overlap and opens the exhaust valves just a little earlier. It holds it them open longer, too—for 223 degrees of crankshaft rotation—and delivers a lift rating of 0.551-inch. The intake specs are actually reduced somewhat from the LT1: 189 degrees of duration and 0.492-inch lift.
Overall, the LT4’s camshaft is relatively mild, thanks to the torque-enhancing benefits of the supercharger. The result is smooth operation at low engine speeds, particularly at idle. The wider LSAcontributes to that smoothness, while also helping to flatten the torque curve and hold power higher in the rpm band.
The LT1 and LT4 differ more dramatically in the valve-actuation attributes of their respective hydraulic roller camshafts. The naturally aspirated LT1 cam specs include 0.551/0.524-inch intake/exhaust lift, 200/207 degrees duration at 0.050-inch lift and a 116.5-degree lobe-separation angle (LSA).
The LT4’s camshaft, on the other hand, is designed to help process a much greater amount of airflow under boost, with a wider, 120-degree LSA that reduces overlap and opens the exhaust valves just a little earlier. It holds it them open longer, too—for 223 degrees of crankshaft rotation—and delivers a lift rating of 0.551-inch. The intake specs are actually reduced somewhat from the LT1: 189 degrees of duration and 0.492-inch lift.
Overall, the LT4’s camshaft is relatively mild, thanks to the torque-enhancing benefits of the supercharger. The result is smooth operation at low engine speeds, particularly at idle. The wider LSAcontributes to that smoothness, while also helping to flatten the torque curve and hold power higher in the rpm band.
