by Steevo » Fri Nov 03, 2017 8:14 pm
The Jab engine does run a bit low. The Jab specs say that down to 11psi is safe.
Mine tends to be about 60psi when the oil is cold but drops to the 30s and 40s when warmed up. Sometimes when coming in on final at idle power, the oil pressure will be just on the tip of the yellow on the gauge.
Some people fit a 3300 oil pump to bring the pressure up. I have heard good and bad things in doing this. Some say it brings the oil pressure up, others say that it just causes the oil pressure relief valve (PRV) to be constantly open.
There were small modifications to the oil pump. If you look at the Jab service bulletins, there are a couple on modifications to the 2200 oil pump. One you can do yourself if you are handy with a die grinder.
If it has been properly overhauled, then the oil pump mod has probably been done. You could try a 3300 pump or even a modification to the PRV. On the whole, I would say that your one sounds about normal.
What temperature does your oil typically run at in cruise? The hotter the oil, the thinner the oil, the lower the pressure.
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