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Top 3 Differences of GAS & DIESEL Engines *Diesel Mechanic Explains*

I discuss the Top 3 mechanical engine differences between Gas And Diesel Engine specifically in a truck application as a diesel mechanic. First and most importantly why diesel engines do not need to use spark plugs for ignition of diesel fuel and why Gasoline engines do need spark plugs. I also discuss why diesel engines use high pressure fuel system and are always forced induction using turbo chargers along side the pros and cons the diesel engine. What I Use: 7.3L POWERSTROKE Engine Oil - https://amzn.to/3ZLIWBD Engine Oil Filter - https://amzn.to/4gHTwRb Fuel Filter - https://amzn.to/3VPim9H Gear Oil - https://amzn.to/3DAdWx1 Grease - https://amzn.to/3BpoHBW 6.4L HEMI Engine Oil - https://amzn.to/4aEbtNE Engine Oil Filter - https://amzn.to/3J1nDUM Engine Air Filter - https://amzn.to/3JMmMVV Cabin Air Filter - https://amzn.to/3JMZAHh Gear Oil - https://amzn.to/3PoIcxa Penetrating fluid - https://amzn.to/3EOclkx Rust protection - https://amzn.to/3Zo0Rh6 Towing Gear: 10 ton Pintle hitch (2.5" receiver) - https://amzn.to/3r7Axvm 7 Ton Adjustable hitch (2" receiver) - https://amzn.to/46i2iAf Adjustable Pintle hitch mount (2.5" receiver) - https://amzn.to/3RqHGS3 15 Ton Pintle hitch - https://amzn.to/45SaCqv 10,000lbs Tie Down Straps - https://amzn.to/3ZBnxeh well we are back at the topic of diesel engines vs gas engines because I think its important to highlight the mechanical differences of both these types of engines which could shed light on the pros and cons of each engine in the truck application or explain why someone may want a diesel or a gas engine. the first major difference is how a diesel engine ignites the diesel fuel. It uses the heat from compression to ignite diesel fuel. as air is squeeze tighter and tighter it heats up quickly at times reaching over 1500 degrees and when diesel fuel is sprayed into the cylinder the heat from the air alone ignites the fuel. now on a Gas engine we use a spark plug, the reason why we can't simply use compression is because gasoline is a much more voliatile substance and has a faster flame propagation, this means that if compression is too high we will get premature ignition or cylinder detonation which can be violent and distructive. whereas diesel fuel is much less volatile and can this means the compression ratio of the cylinder can be much greater and hotter without uncontrolled cylinder detonation. the second big difference is diesel engines using very high pressure fuel systems. a modern diesel engine is running north of 30,000 psi of fuel pressure whereas a typical port injection engine is usually running below 100 PSI of fuel pressure a very large difference. with this high fuel pressure comes much more complex fueling system and there is a reason why diesel engines need this much pressure, more pressure gives better atomization and this allows for a better burn of the fuel and less emissions. also for engines that are using more then 1 shot of diesel per combustion event it helps with timing and precision of the fuel into the cylinder. lastly is that most diesel engines are turbo charged or use forced induction to help with torque generation and efficiency. turbo help to push more air into the engine to help burn the fuel as efficiently as possible. they also help to extend the torque band of a diesel engine higher into the RPM band giving more usable torque. I do find it interesting seeing alot of manufacturers implementing some of these traditional diesel characteristics into their gas engines to try and capture some of the efficiency. 00:00 - Intro 01:07 - Gas & Diesel Similarities 02:03 - No Spark Plugs!! 09:09 - High Pressure Fuel Systems 12:16 - Turbo Charged 14:11 - Gas Engines with Diesel Characteristics