That might be why when the pressure rises the fluctuations get larger. The Accufab website does not give the pressure specs that the regulator is good for. Maybe they just spec'd it for 15psi and not more? For retail price of $159 on their website you would think the regulator would be high quality and stable at higher pressures-NOT.
For those still following
Received the new Kirban FPR for comparison. Here are the pictures.
Hey, I'm still following: area = Pi * R * R. (Pi * radius squared).
One thing I did note is how the fuel entry to the chamber is formed between the different regulators. The Kirban regulator uses a larger oval opening, which will reduce the pressure the entering fuel places on the diaphragm.
RemoveBeforeFlight
Interesting stuff here Jerryl. The design of the stock Bosch regulator is a bit different from the aftermarket regulators. Subtle differences at that.
I run a fuel pressure transducer and log it, with an Accufab FPR. The pressure does jump around, I thought that this was due to the pressure fluctuations of the positive displacement pump(s). Now I'm not so sure, need to post filter the heck out of the data to smooth it, even with a tiny orifice at the transducer (mechanical filtering).
RemoveBeforeFlight
...I might neutral set up a complete fuel system and do some testing I'll just have to create a way to drive injectors...
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Aluminum isn't metal??Atrocious quality!
This is PRV 100. Accufab should be embarrassed.
The seat is metal, not aluminum. . .
Exactly my thoughts.Jerryl, being a Captain Obvious kind of guy, the big difference is the spring pressure being less on the Kirbans and worse on the Accuflub. That is pretty much what the logs of the fuel pressure showed for me. The Bosch 237 was almost a flat line, Kirbans has some bouncing and the Accuflub was the highest. Not knowing the science and ramifications of all this, my uneducated self thinks a flat line would be better for overall performance of the injectors.
How about trying the Bosch spring in the Accuflubber?