Quote:
Originally Posted by JoinerJam
Hello All,
I've been wondering where to set the release or "pop" pressure of my Bosch mechanical fuel injectors, within its range of 115-123 bar (i think). On om601 and om602 engines, in my case.
I understand that the release pressure of the injectors affects timing, but am wondering how the release pressure affects other attributes.
How is fuel economy, engine running temperature, performance, etc affected by setting the release pressure, say, on the low end vs. the high end of the scale?
Can anyone give a rationale or rule-of-thumb of setting the pop pressures?
thanks!
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If you have original Injectors there is a bar listing on the upper injector body. However, there is no range listed on the body.
Non-turbo (naturally apriated) Injectors have a lower pop pressure then turbo charged engines do.
The pop pressure is adjusted with shims which is part of the reason for the range. What is often done is if you replace the nozzles you the pop test them and see what part of the range (if with in the limits) most of the injectors fall and then target that range.
However, a lot of people prefer to go for the highest end of the range even if it means changing the shims several times.