After two years of development, we're excited to release details about our new 3.5L naturally aspirated powerplant.
Branching off our 3.5L stroker program, the new naturally aspirated power plant uses a 93mm x 86mm stroke by way of a sleeved NSX cylinder block, billet stroked crankshaft, connecting rods, and forged pistons of our design. Despite switching to billet 4340 steel connecting rods, we were able to reduce the rotating assembly's weight by more than 20 grams by designing a lightweight yet strong H beam connecting rod. The engine uses a mildly ported head with Toda camshafts to a custom specifications to work in conjunction with the bottom end. This engine also features our new generation 2 individual throttle body system, which on this engine, produced more than 35 wheel horsepower compared to the factory intake manifold with a big bore throttle body. Fueling the car is E85, a pump fuel becoming more widely available. 85% ethyl alcohol, the fuel has an octane rating of approximately 95 octane (R+M)/2 - giving it a slight advantage to standard 91 octane pump fuel.
Testing has completed, and we've been very happy with the results. Our test car produced 400.2 whp and 307 lb/ft of wheel torque. This power (approximately 460 crankshaft horsepower) is close to the power used in the 3.5/3.4L GT500 NSX in Japan, but on pump fuel instead of race fuel. The throttle bodies, lighter rotating assembly, and light clutch gives the car amazing throttle response. With the development of the generation 2 individual throttle body system, features like the factory idle air control valve are also retained. Despite the very high overlap cams, the engine stably idles and revs. A fully enclosed top feed or side feed air filtration box will be available soon.
If you're in to naturally aspirated NSX, this is the ultimate powerplant for you.
Come check out this newest creation at our booth on Thursday at NSXPO.
Look forward to seeing you there.
regards,
-- Chris
Branching off our 3.5L stroker program, the new naturally aspirated power plant uses a 93mm x 86mm stroke by way of a sleeved NSX cylinder block, billet stroked crankshaft, connecting rods, and forged pistons of our design. Despite switching to billet 4340 steel connecting rods, we were able to reduce the rotating assembly's weight by more than 20 grams by designing a lightweight yet strong H beam connecting rod. The engine uses a mildly ported head with Toda camshafts to a custom specifications to work in conjunction with the bottom end. This engine also features our new generation 2 individual throttle body system, which on this engine, produced more than 35 wheel horsepower compared to the factory intake manifold with a big bore throttle body. Fueling the car is E85, a pump fuel becoming more widely available. 85% ethyl alcohol, the fuel has an octane rating of approximately 95 octane (R+M)/2 - giving it a slight advantage to standard 91 octane pump fuel.
Testing has completed, and we've been very happy with the results. Our test car produced 400.2 whp and 307 lb/ft of wheel torque. This power (approximately 460 crankshaft horsepower) is close to the power used in the 3.5/3.4L GT500 NSX in Japan, but on pump fuel instead of race fuel. The throttle bodies, lighter rotating assembly, and light clutch gives the car amazing throttle response. With the development of the generation 2 individual throttle body system, features like the factory idle air control valve are also retained. Despite the very high overlap cams, the engine stably idles and revs. A fully enclosed top feed or side feed air filtration box will be available soon.
If you're in to naturally aspirated NSX, this is the ultimate powerplant for you.
Come check out this newest creation at our booth on Thursday at NSXPO.
Look forward to seeing you there.
regards,
-- Chris
