Quote:
Originally Posted by teoman
Tvago could you do a flow test on the injectors?
I am curious as to why there was such a massive fuel economy hit.
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The improvement is due to tooling and has occurred steadily between 1990 and 2015+.
What has happened is that the companies have been able to machine to ever increasing tolerances meaning that the sprays have continued to get finer.
In an internal-combustion-engine, it's the vapour around the droplets that explodes. The droplets themselves just hit the combustion chamber walls and are used for cooling.
Recently, Direct-Injection has taken over port injection. These injectors are even finer.
The general assumption is that 'nothing has changed' with Injectors over the last 20 years but actually these continual tooling improvements really have changed fuel-injectors dramatically. It also explains why modern cars are getting so much power than before because the injectors are working better.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
