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Registered
Join Date: Aug 2015
Location: Cologne / Germany
Posts: 707
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It also depends on the type of the leak down tester. Common Chinese cheap ones work with pressures of about 1 bar for measuring, which results in higher percentage results where these are still within specs.
The higher the pressure for testing the smaller the tolerance window gets. Means with 100 Psi a result of 8% can already mean an almost non acceptable pressure loss.
Those professional Hazet testers i.E. with only one gauge work internally with 4 Bar towards the combustion chamber:
https://nineelevenheaven.wordpress.com/leak-down-tests-on-a-911-sc/
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911 SC 3.0, 1982, black, US model – with own digital CPU based lambda ECU build and digital MAP based ignition control
All you need to know about the 930/16 and 930/07 Lamba based 911 SC US models:
https://nineelevenheaven.wordpress.com/english/
Last edited by AndrewCologne; 03-11-2025 at 10:17 AM..
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