Idi?
Posting Guru
Joined: Jan 2003
Posts: 1,412
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From: Munroe falls, Ohio
IDI and DI refer to where the fuel is injected.
Indirect injection: the fuel is injected in a prechamber, ignites and spreads into the main chamber over the piston.
Direct injection: The injection nozzle is placed inside the combustion chamber and the piston incorporates a depression where initial combustion takes place. Direct injection diesel engines are generally more efficient and cleaner than indirect injection engines.
The same applies for gas engines, although there arent many DI gas engine out yet.
Indirect injection: the fuel is injected in a prechamber, ignites and spreads into the main chamber over the piston.
Direct injection: The injection nozzle is placed inside the combustion chamber and the piston incorporates a depression where initial combustion takes place. Direct injection diesel engines are generally more efficient and cleaner than indirect injection engines.
The same applies for gas engines, although there arent many DI gas engine out yet.
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Elder User
Joined: Jan 2008
Posts: 825
Likes: 1
From: SW Washington coast
Tanx a bunches ... Simple terms I can understand ... I wonder why they invented the IDI in the first place ... Seems to me that they would have done DI in the first place instead of going to all the trouble to make a diff chamber as well as the bore ... Oh well ...
Posting Guru
Joined: Mar 2005
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From: KY
Direct injection motors are generally louder. Not really the case as much anymore. pre-combustion motors were a thing of the past. The purpose of them were to help with fuel ignition. Back then injection pressures weren't near as high as today and the fuel wouldn't atomize as well. The turbulance chambers that we have in our motors were strictly for noise.
Senior User
Joined: Feb 2007
Posts: 191
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From: Denair, CA
Originally Posted by magusjinx
Tanx a bunches ... Simple terms I can understand ... I wonder why they invented the IDI in the first place ... Seems to me that they would have done DI in the first place instead of going to all the trouble to make a diff chamber as well as the bore ... Oh well ...
Elder User
Joined: Jan 2008
Posts: 576
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From: Central Coast CA
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Elder User
Joined: Jan 2008
Posts: 825
Likes: 1
From: SW Washington coast
I think I will keep my NA IDI diesel ... Sounds like a good thing ... Now I just need to make it a bit more efficient and quieter ...
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