Test Details:
The test XTO engine has just completed all our Nizpro Marine Tuning and stage one power development, which comprises of full engine calibration, endurance and validation testing, and emissions testing.
It has a complete service history and has run pump 89 octane its entire life.
Total Engine Hours: 2549
Prior to the Ring Free test a leak-down test was conducted.
The engine was brought up to operating temperature and the following leak down numbers were measured and recorded.
The standard Yamaha XTO 425 engine calibration was used for all Ring Free testing.
The test selected was the Yamaha Ring Free shock treatment using 2oz per 10 gallons of fuel (as directed) for a total fuel burn of 66 gallons (250 litres).
The actual mixing ratio was achieved by using the mass of Fuel to Ring Free as this is more accurate due to temperature differences affecting volume.
𝗧𝗵𝗲 𝗳𝗼𝗹𝗹𝗼𝘄𝗶𝗻𝗴 𝗵𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀 𝘁𝗵𝗲 𝘁𝗲𝘀𝘁 𝘀𝘂𝗺𝗺𝗮𝗿𝘆 𝗮𝗻𝗱 𝗸𝗲𝘆 𝗽𝗮𝗿𝗮𝗺𝗲𝘁𝗲𝗿𝘀:
• Engine had two cold start cycles and warm up.
• Engine had 6 hot start cycles.
• Engine was set at 3300 rpm at 119 hp.
• Total run time 8 hours 55 minutes.
• Fuel consumption @ 119 hp/3300 rpm was 8.8 G/hr (33.3 L/hr)
• Direct Injection fuel pressure at the injectors was 2900 PSI on both banks.
• Low pressure VST pumps @ 55.1 PSI.
• Engine temperature 204.8°F (96°C).
• Water temperature 149°F (65°C).
• Air Fuel ratio 13.0:1 (0.89 Lambda).
• Exhaust gas temperature 885°F (474°C)
• Cylinder Mass Air Flow 287.24 Kg/hr
• Ignition timing 24° BTDC
• Camshaft VCT position 22.2 degs
• Oil pressure 92.7 psi/639.3kpa
• Intake air temperature 71.6F/22C
