By HuaQuan Engineering TeamPublished: 2026-07-17Category: Wiki Encyclopedia

Definition

Aftercooler: Cools compressed intake air after turbocharger. Bore: Cylinder diameter. Camshaft: Controls valve timing. Compression Ratio: Cylinder volume ratio (14:1 to 25:1 for diesel). Connecting Rod: Links piston to crankshaft. Crankshaft: Converts reciprocating to rotary motion. Cylinder Head: Seals cylinder top. Displacement: Total swept volume of all cylinders. Flywheel: Rotational energy storage. Fuel Injector: Sprays atomized fuel into cylinder. Glow Plug: Pre-heating for cold start. Intercooler: Same as aftercooler. Piston Rings: Seal between piston and cylinder wall.

Diesel Engine Glossary — Complete Terminology Guide

Aftercooler: Cools compressed intake air after turbocharger. Bore: Cylinder diameter. Camshaft: Controls valve timing. Compression Ratio: Cylinder volume ratio (14:1 to 25:1 for diesel). Connecting Rod: Links piston to crankshaft. Crankshaft: Converts reciprocating to rotary motion. Cylinder Head: Seals cylinder top. Displacement: Total swept volume of all cylinders. Flywheel: Rotational energy storage. Fuel Injector: Sprays atomized fuel into cylinder. Glow Plug: Pre-heating for cold start. Intercooler: Same as aftercooler. Piston Rings: Seal between piston and cylinder wall.

TermCategoryDefinition
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Example 2CategoryDefinition text
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AbbreviationFull FormContext
ABCAlpha Beta CharlieIndustry standard
DEFDelta Echo FoxtrotTechnical specification
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Standard AOrg AIndustry governance
Standard BOrg BTechnical compliance

Key Takeaways

Quick Reference

Related Terms

Diesel Generator | Generator Components | Power Generation | Electrical Engineering | Industry Standards

Frequently Asked Questions

What is an alternator vs generator?
Technically: alternator produces AC, generator produces DC. Colloquially, 'generator' means complete genset. Modern alternators use brushless self-excited synchronous design.
What is wet stacking?
Wet stacking occurs when diesel engines run at <30% load for extended periods, causing unburned fuel accumulation. Prevention: load bank testing at 75%+ load monthly.
What is generator derating?
Derating reduces output for environmental conditions. Altitude: -1% per 100m above 1000m. Temperature: -1% per 10°C above 25°C.
What is a standby generator rating?
Standby rating: maximum power for emergency use, 200-250 hours/year max, no overload. Typical for backup applications. Also called Emergency Standby Power (ESP).
What is the difference between kW and kVA?
kW (kilowatt) = real power consumed. kVA = apparent power. kW = kVA x Power Factor. Standard PF is 0.8: 100 kVA = 80 kW.
What is a transfer switch (ATS)?
An ATS automatically switches load between utility and generator. Types: open transition, closed transition (make-before-break), soft-loading. NFPA 110 requires <10 sec transfer.
What is biodiesel?
Biodiesel is renewable fuel from vegetable oils or animal fats. B20 compatible with most diesel engines. B100 requires engine modifications.
What is synchronizing?
Synchronization matches voltage, frequency, phase angle, and phase sequence before connecting a generator to a live bus. Auto-synchronizers control speed and voltage automatically.
What is a load bank test?
Load bank testing applies artificial load (75-100%) to exercise generator. Prevents wet stacking, verifies capacity, tests cooling system. Recommended monthly for standby units.
What is Modbus?
Modbus is an open serial protocol (RS-485) for generator controller integration. RTU mode: registers map to generator parameters. Supported by most controllers.
What is ISO 8528?
ISO 8528 is the international standard for reciprocating internal combustion engine driven AC generating sets. Defines ratings, performance, testing, and documentation requirements.
What is a brushless exciter?
Brushless excitation eliminates brushes/slip rings using rotating rectifiers. Benefits: no brush maintenance, no carbon dust, explosion-proof — standard in modern generators.
What is IP rating?
IP (Ingress Protection) indicates enclosure protection. IP44: spray water. IP54: dust protected. IP65: dust tight + water jets. Generator enclosures typically IP44-IP65.
What is a diesel generator?
A diesel generator converts the chemical energy in diesel fuel into electrical energy. It consists of a diesel engine (prime mover) and an alternator (generator) mounted on a common base frame.
What is NFPA 110?
NFPA 110 is the US standard for emergency and standby power systems. Level 1: life safety (hospitals, high-rise). Level 2: less critical. Defines transfer time, testing, and maintenance.

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