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I've been doing a lot of thinking about trying to come up with failsafe pump systems for the RB26 - some of us have fallen victim to a shattered oil pump, and I'm surely not the only one to have been burned by a fuel pump failure (I've been told that Bosch pumps in particular like to dribble and weakened flow rates just before dying).
anyways, here's my fuel pump idea:
-use two fuel pumps, but each one by itself should be enough to supply your fueling needs (i.e. one of the pumps being rated to flow your required liters/hour at specified pressure)
-have each pump feed one end of a fuel rail. Set the single return line to the appropriate fuel pressure with the FPR.
-I'm guessing, I don't know, but I'm thinking that, with double the pumping power, the flow through the system will be doubled, but with standard fuel pressure
-if one pump fails, the other will still be running, and although flow will be halved, the single pump will still be enough to maintain pressure and, being already rated to cover flow, will keep the engine from running superlean and undergoing a meltdown.
ISSUES:
will the fuel system really be ok with a rated flow of nearly 600liters/hour? Any problems with injectors wearing out? How about the pumps? Will each pump be strained less (as it has a partner sharing the work) or would they interfere with each other, making failure more likely?
Most importantly, what kind of sensor can be rigged to indicate a pump failure?
Oil system idea:
-run an Accusump
ISSUE:
as an Accusump is designed to kick in at exactly the oil pressure your engine is already running at, is there any way to detect (via a sensor) that the oil pump has failed, during the 15-60 seconds that the Accusump is supplying its backup oil?
If this all worked, I'd have three LED indicators on my dash, and if one starts blinking, I'd have plenty warning that a pump has failed and my engine could be saved.....
anyways, here's my fuel pump idea:
-use two fuel pumps, but each one by itself should be enough to supply your fueling needs (i.e. one of the pumps being rated to flow your required liters/hour at specified pressure)
-have each pump feed one end of a fuel rail. Set the single return line to the appropriate fuel pressure with the FPR.
-I'm guessing, I don't know, but I'm thinking that, with double the pumping power, the flow through the system will be doubled, but with standard fuel pressure
-if one pump fails, the other will still be running, and although flow will be halved, the single pump will still be enough to maintain pressure and, being already rated to cover flow, will keep the engine from running superlean and undergoing a meltdown.
ISSUES:
will the fuel system really be ok with a rated flow of nearly 600liters/hour? Any problems with injectors wearing out? How about the pumps? Will each pump be strained less (as it has a partner sharing the work) or would they interfere with each other, making failure more likely?
Most importantly, what kind of sensor can be rigged to indicate a pump failure?
Oil system idea:
-run an Accusump
ISSUE:
as an Accusump is designed to kick in at exactly the oil pressure your engine is already running at, is there any way to detect (via a sensor) that the oil pump has failed, during the 15-60 seconds that the Accusump is supplying its backup oil?
If this all worked, I'd have three LED indicators on my dash, and if one starts blinking, I'd have plenty warning that a pump has failed and my engine could be saved.....