2. The difference between De and DE
What's the difference between SR20De and SR20DE, and what's the difference between SR20DEL and SR20DEH?
Simply put, they are just there to differentiate between the 150hp engines found in the eZX, eGT, GT and Almera GTI spec cars, and all the other non 150hp 2.0l cars.
SR20De = all the 2.0l engined cars, that are not 150hp.
SR20DE = all the 150hp engined cars.
Thats the easy bit, lol.
The DEL and DEH were brought into play Oct.97, this was brought in because Nissan started to use an Electronic system for their parts finiding instead of the old Microfilm way. The system was known as the Nissan Fast System.
Now, the DEL and DEH came into play because this new fast system did not support lower case fonts, only uppercase fonts, so Nissan in their wisdom added the L for the SR20De labeled engines and added a H on the end for the SR20DE engine codes.
Hence looking for anything on the fast system, you searched for a DEL for the lower powered engines, and the DEH for the higer powered engines.
Now when the P11-144s were launched 2000, around that time, they got rid of the L, and the H and kept it to just DE on the latest fast system, this seems likely because they had now stopped the use of the higher powered 150hp SR20DE engines.
Hope this clears it all up for ya.