Source: https://guthlabs.ai/docs/instruments/otto-cycle-efficiency-calculator/implementation/

instrument implementation / implementation-contract

# Otto Cycle Efficiency Calculator implementation

A source-bound implementation contract for Otto Cycle Efficiency Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t2-048

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not state input validation for r<=0 or for the physically invalid range r<1. r=0 causes division by zero, while r<1 produces a mathematically defined but physically invalid negative efficiency. The compression-ratio direction convention is also not stated, allowing the ratio to be inverted and producing a radically different result.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "r": 8,
    "gamma": 1.4,
    "Qin": 1000,
    "Qin_units": "kJ/kg"
  },
  "expected_outputs": {
    "eta": 0.5647247184,
    "net_work": 564.7247184,
    "net_work_units": "kJ/kg"
  },
  "working": "γ−1 = 1.4−1 = 0.4. 8^0.4 = 2.297396709. 1/8^0.4 = 0.4352752816. η = 1−0.4352752816 = 0.5647247184. w_net = η·q_in = 0.5647247184·1000 = 564.7247184 kJ/kg."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/otto-cycle-efficiency-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/otto-cycle-efficiency-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/otto-cycle-efficiency-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche2/tranche2-results.json`