Market analysts are projecting the small gasoline engines market size set to surpass $10B by the end of 2035, growing at a CAGR of 7.2% during the 2023 – 2035 forecast period, from an industry size of around $4B in 2022. The rising carbon emissions awareness amongst many individuals and companies consuming small gasoline engines is a factor forcing many Original Equipment Manufacturers (OEM's) to look for alternative low-emission engine solutions, delivering the same application power, if not more. ONYX has developed a suite of Propane Powered small engines from 452cc (13 HP) to 999cc (31hp), for both vertical shaft oriented and horizontal shaft oriented applications.
Background – Propane Engine Technology
Over the years here in the US, widespread adoption of internal combustion engines using propane fuel systems has been slow. The main reasons being availability of propane fuel, affordable gasoline prices here in the US, and reliability performance issues with propane powered engines. More recently, with emission regulations closing in on gasoline and diesel-powered small engines paired with elevated gasoline and diesel prices, propane powered engine solutions are being viewed as a viable alternative. Propane is typically 30%-35% less expensive than gasoline and the supply of propane has become more widespread throughout the US over the last decade, e.g. most U-Haul locations nationwide have bulk propane filling stations and there are numerous propane distributors who will make regular propane tank deliveries or fillings for customers or at job sites. ONYX propane engines can run up to 100 times cleaner than their gasoline equivalent for exhaust emissions, with zero evaporative emissions from propane engines. This provides OEM's longevity to continue to use the superior power that internal combustion engines deliver in their products for the next couple of decades.
These factors together only leaves reliable performance concerns as the major remaining factor holding back the adoption of propane engine solutions for many industrial, agricultural, and lawn & garden applications. During the COVID era, ONYX embarked on an in-depth continuous improvement project to solve all of these endemic issues that have plagued propane fuel systems. ONYX has now incorporated these solutions into their latest engine families resulting in stable engine performance over a wide range of different operating conditions.
Traditional propane fuel systems do not precisely manage the fuel phase change within the fuel system, leading to fuel supply instability and unstable engine performance.
Summary of common and prevalent issues with all legacy Propane Fuel Systems:
1. Widespread use of vapor draw tanks opposed to using liquid draw tanks due to common regulator freeze and associated with using liquid draw tanks.
2. Fuel flow issues when running vapor draw propane tanks causing premature run times and engine instability, especially with heavy load applications.
3. Vapor draw tanks susceptible to pressure variations due to ambient temperatures and dropping tank pressure during use leading to engine run instability.
4. Frequent vapor draw tank overfilling leading to liquid fuel ingestion causing regulator freeze and damage and unstable engine performance.
5. System instability, engine stall, and component damage when running on liquid draw tanks.
6. Fuel pressure and flow delivery not accurately metered precisely enough by traditional propane fuel systems. Regulating from variable tank pressures (as high as 180psi) to a very precise jet pressure of 2psi is difficult using traditional fuel metering methods.
7. Propane "heavy ends" impurities in the Propane fuel leading to system "gum-up" and component failure.
8. Electronic Fuel Injection (EFI) systems are not robust enough or suitable for many industrial applications due to excessive unit vibration, mechanical stresses, and environmental conditions; and EFI would not solve many of the problems cited above.
ONYX has developed new propane engine technology that eliminates ALL of the traditional issues associated with propane engine systems.
