Exhaust-to-Intake Temperature Ratio

Ratio of exhaust-gas to charge-air temperature - a sensitive indicator of cylinder fuel balance, valve timing and cooler performance.

EngineExhaustDiagnostics

Exhaust after-valve T°CCharge-air T (after CAC)°C

T_exh / T_in (K/K): 2.179 -

Status: Normal

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

r_T = \frac{T_{exh}}{T_{intake}}

Symbol	Meaning	Unit
$T_{exh}$	After-valve exhaust temperature	°C
$T_{intake}$	Receiver charge-air T	°C

Source: MAN ES Operating Guide

In short

Ratio of exhaust-gas to charge-air temperature - a sensitive indicator of cylinder fuel balance, valve timing and cooler performance.

Learn the theory Engine Performance Monitoring: PMI Systems