I don't understand your point.
Quote:
Originally Posted by Doru
the 2 bar cap was used on 4 cylinder, 6 cylinder and 8 cylinder engines. Each with different temperature AND pressure related specs for their cooling system. Enter the bean counters, and the result is: use the 2 bar cap for every model lineup, no matter the engine displacement, cooling spec etc. It's much cheaper......
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If a 2 bar cap was used then components like the expansion tank would have needed to be validated against that expected maximum pressure. The operating pressure will be different for each model, as you say, but what does that have to do with designing, building, and testing the expansion tanks to handle 2 bar plus a safety factor? It would be far cheaper to have one expansion tank spec than a different one for each model. The bean counter argument works in both directions.
The system was designed to have a 2 bar cap. It worked that way for 6 years of production, according to your data, and has worked for 10+ years since then. If a failure occurs now, it is not likely a design issue, or a manufacturing issue, but a (lack of) maintenance issue. Latent design issues don't hide for up to 17 years and then jump out to bite you. And putting a lower pressure cap on it is just a band aid designed to cover up poor maintenance practices and low quality aftermarket parts, IMO.
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