Symphony of combustion
The GT1 engine, a 7.0L Roush Yates RY45TT, was conceived to be the most exotic, most capable motorsports engine variant to ever be put in a Ford chassis.
427. A Historical Significance.
When given the opportunity to select the perfect engine for the GT1, we immediately looked to pay respect to the Le Mans winning GT40s of 1967 and 1968, which featured a 427ci 7.0 Liter Ford V8. The Matech Ford GT1 of 2009 later partnered with Roush Yates, the preeminent Ford racing engine builder and manufacturer. This led the GT1 program team to the Roush Yates RY45, arguably the best and most advanced high-displacement aluminum block engine ever put in a Ford chassis.
Roush Yates RY45
The RY45 gets its name from it's 4.500" bore centers, allowing for a large bore piston to achieve larger displacements at shorter strokes. The engine was a clean sheet design for Roush Yates, leveraging almost everything learned from the Ford FR9, the iron-block championship winning sister built by Roush Yates for the NASCAR series. The heads on the RY45 were designed to provide massive air flow at high RPMs. The RY45 took everything learned with spinning Ford's NASCAR engine at 9,000rpm and translated it to an all-aluminum architecture for a massive weight savings.
Packed with Titanium and Inconel.
Material selection was incredibly important in the development of the GT1 RY45TT. Only the best parts and vendors were selected for the GT1 engine program. Del West, the most well known valvetrain supplier in Formula 1, supplied forged titanium intake valves with CrN coatings for the GT1 to reduce weight and allow for lightning fast engine sprints to 9,000rpm. The crankshaft in the RY45TT is machined from a single piece of 4330(M) billet in a process that takes over 68 machining hours from start to finish. No expenses were spared in the RY45TT engine design.
GT1 partners with Garrett Motion for its most advanced mid-frame turbochargers. The GT1 ball bearing turbos feature numerous advancements including Mar-M super alloy on the turbine wheel which can withstand exhaust temperatures of over 2400 degrees F. The compressor wheel is the most efficient ever produced. At just 4 pounds of boost, the G35s propel the RY45TT to 1150 horsepower on 93 octane pump gas. The G35 turbos flow enough air to provide 1800 horsepower at peak boost and efficiency within their compressor map.
Ball Bearing Turbochargers
Billet Intercooled Intake
The GT1 RY45TT uses a bespoke billet intake that was designed to house a 336ci water-to-air intercooler. The core design rapidly cools charged-air temperatures, exhausting the excess heat to a heat exchanger mounted behind the driver's side scoop. Intake runners were designed and optimized for high RPM flow which enable the RY45TT to support a virtually flat torque curve from 3700rpm to 8500rpm.
Sounds Like No Other.
The GT1 RY45TT was developed to preserve the harmonic characteristics of the combustion chamber, cylinder head design and exhaust scavenging of the RY45 at full song. This was done with equal length headers and X-pipes to stack exhaust pulses evenly. The result is a symphonic quality that has to be heard to be believed above 6000rpm at wide open throttle.
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