Estimate carbon deposit accumulation rate on intake valves for direct-injection engines based on driving patterns and oil consumption.
Input Parameters
Results
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Carbon Deposit Rate
g/yr
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Walnut Blast Interval
miles
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Est. Flow Reduction
%
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Buildup Severity at 50k mi
Note: GDI engines are prone to carbon buildup since fuel is not sprayed on intake valves. Walnut blasting or chemical cleaning every 30-50k miles is recommended.
Reference
Carbon/mile = Base x City_factor x Oil_factor x EGR_factor
Base rate: 0.0003 g/mi for GDI engines
City Factor = 1 + City% x 0.8
Oil Factor = 1 + Oil_consumption x 1.2
EGR Factor = 1.5 (with EGR), 1.0 (without)
Flow Reduction = Carbon_mass x 0.3%