Otto cycle efficiency API

Air-standard Otto (spark-ignition) thermal efficiency η = 1 − 1/r^(γ−1) from compression ratio r and specific-heat ratio γ, plus the compression temperature ratio. Answers 'What is the ideal efficiency of a gasoline engine?', 'How does compression ratio affect engine efficiency?'.

Price$0.04per request

MethodPOST

Route/v1/engineering/otto-efficiency

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

engineeringthermofluidsthermodynamicsotto-cycleenginecompression-ratioefficiencyic-engine

API URLhttps://x402.hexl.dev/v1/engineering/otto-efficiency

Integration docs

Example request

{
  "compressionRatio": 10,
  "gamma": 1.4
}

Example response

{
  "compressionRatio": 10,
  "gamma": 1.4,
  "thermalEfficiency": 0.601893,
  "thermalEfficiencyPercent": 60.1893,
  "compressionTempRatio": 2.511886,
  "formula": "η_Otto = 1 - 1/r^(γ-1)",
  "interpretation": "Higher compression ratio raises ideal efficiency but risks knock in real engines."
}

Input schema

{
  "type": "object",
  "required": [
    "compressionRatio"
  ],
  "properties": {
    "compressionRatio": {
      "type": "number",
      "description": "volumetric compression ratio r",
      "examples": [
        10
      ]
    },
    "gamma": {
      "type": "number",
      "description": "specific-heat ratio γ; default 1.4"
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}