IDI? International Direct Injection?
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Joined: Apr 2004
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Indirect Injection
The injector is positioned in the intake runner and fuel is injected as the intake valve opens and piston is on it's intake stroke. Since fuel is not directly injected into cylinder on compression stroke as in a DI engine it's called IDI. Much less fuel presure is required. Much less efficient than DI. Very old school. Basically it's fuel injection for diesels.
The injector is positioned in the intake runner and fuel is injected as the intake valve opens and piston is on it's intake stroke. Since fuel is not directly injected into cylinder on compression stroke as in a DI engine it's called IDI. Much less fuel presure is required. Much less efficient than DI. Very old school. Basically it's fuel injection for diesels.
Last edited by 04F250CC60; Oct 18, 2004 at 05:47 PM.
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From: Northeastern Pa - USA
Yepper, the older diesels are idi (indirect injection). The fuel is sprayed into a precombustion chamber. Kinda like warms it up before it compresses it. The old old caterpillars were the same way. The change to direct injection came somewhere in the 94 model year with the power stroke designation.
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From: Penn Valley
Originally Posted by 04F250CC60
Indirect Injection
The injector is positioned in the intake runner and fuel is injected as the intake valve opens and piston is on it's intake stroke. Since fuel is not directly injected into cylinder on compression stroke as in a DI engine it's called IDI. Much less fuel presure is required. Much less efficient than DI. Very old school. Basically it's fuel injection for diesels.
The injector is positioned in the intake runner and fuel is injected as the intake valve opens and piston is on it's intake stroke. Since fuel is not directly injected into cylinder on compression stroke as in a DI engine it's called IDI. Much less fuel presure is required. Much less efficient than DI. Very old school. Basically it's fuel injection for diesels.
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