{
    "title": "Passive Turbo Fuel Saver",
    "inventor_name": "George Heeley",
    "publication_year": 2007,
    "device_name": "Passive Turbo fuel-saving device",
    "goal": "Increase vehicle fuel efficiency, reduce exhaust emissions and boost engine power.",
    "problem_addressed": "Low miles-per-gallon (mpg) and high emissions from petrol and diesel engines due to incomplete combustion.",
    "concept_summary": "A retrofit apparatus that replaces the standard air filter with a near-zero-drag filter and adds a sealed chamber containing an oil-based liquid (upper-cylinder lubricant). Ambient air is drawn through the filter, accelerated by a venturi, and bubbled through the liquid, picking up volatile additives. The enriched air is then fed to the engine intake manifold, improving combustion efficiency and reducing emissions.",
    "detailed_description": null,
    "category": "Mechanical Engineering",
    "principles": [
        "Air filtration with low pressure drop",
        "Venturi-induced air acceleration",
        "Liquid-to-air vapor enrichment"
    ],
    "scientific_domains": [
        "Mechanical Engineering",
        "Thermodynamics",
        "Combustion"
    ],
    "mechanisms_of_action": [
        "Enrichment of intake air with oil-derived vapors",
        "Increased oxygen-rich air flow to engine",
        "Reduction of intake restriction"
    ],
    "materials": [
        "Oil-based liquid (upper-cylinder lubricant)",
        "Knitted copper mesh filter (multiple mesh sizes)"
    ],
    "energy_sources": [
        "Engine intake air (pressurised by turbocharger or supercharger)"
    ],
    "inputs": [
        "Ambient air",
        "Oil-based liquid"
    ],
    "outputs": [
        "Enriched intake air",
        "Improved fuel economy",
        "Reduced exhaust emissions"
    ],
    "claimed_performance": "Petrol engines: 25-75 % increase in mpg; Diesel engines: 18-25 % increase in mpg; also reported power gain and lower emissions.",
    "experimental_evidence": "Tested on vehicles in the UK and US; over 1,000 vehicles fitted with the device reporting the above performance improvements.",
    "replication_status": "Device installed on >1,000 vehicles; no independent third-party replication reported.",
    "keywords": [
        "fuel saver",
        "air enrichment",
        "venturi",
        "oil vapor",
        "retrofit",
        "emissions reduction"
    ],
    "related_technologies": [
        "Turbocharger",
        "Supercharger",
        "Air intake filter"
    ],
    "controversy_level": "medium",
    "confidence_score": 0.78,
    "practicability_score": 0.62,
    "fringe_score": 0.35,
    "evidence_strength": 0.48,
    "risk_score": 0.22,
    "trl_estimate": 5,
    "source_urls": [
        "http://www.keelynet.com/indexmar307.htm",
        "http://icliverpool.icnetwork.co.uk/liverpoolecho/news/echobusiness/tm_headline=invention-cuts-pollution-from-car-exhausts&method=full&objectid=18778230&siteid=50061-name_page.html",
        "https://patents.google.com/patent/GB2465001",
        "https://patents.google.com/patent/US2013087126"
    ],
    "organizations": [
        "Kleen and Green Miracle Solutions"
    ],
    "applications": [
        "Passenger cars",
        "Heavy-goods vehicles (HGVs)",
        "Diesel trucks"
    ],
    "limitations": [
        "Requires regular replenishment of oil-based liquid",
        "Effectiveness may vary with engine type (diesel vs petrol)",
        "Potential for oil carry-over into intake if baffle fails"
    ],
    "open_questions": [
        "Long-term impact on engine wear and oil consumption",
        "Quantitative emissions data under standardized test cycles",
        "Scalability to high-performance or turbocharged engines"
    ],
    "red_flags": [
        "No peer-reviewed data or independent verification",
        "Very high claimed mpg gains without published test methodology",
        "Potential conflict of interest (inventor also manufacturer)"
    ],
    "evidence_quotes": [
        "The Passive Turbo works using a special air filter with near zero drag resulting in the engine receiving near on 100% of air on the induction stroke.",
        "The second stage of this device consists of a container of liquid (non flammable) that changes its state from liquid to a gas by molecular adhesion.",
        "The gadget gives petrol powered cars a miles per gallon increase of between 25 to 75% and 18 to 25% on diesel powered vehicles.",
        "To date more than 1,000 vehicles in the US have been fitted with the device.",
        "It has been found that the engine running on enriched air leads to improved fuel efficiency and reduced unwanted emissions due to, inter alia, improved combustion."
    ]
}