flyrotary@lancaironline.net Mailing List Archive

Al,

Thanks for the info on the Laminova cooler. I'll watch the oil pressure closely.

Mark

Some further thought (always good to think furtherJ): Regardless of the pressure drop caused by the cooler; there is likely ample flow back to the gallery so that some oil is being bypassed by the pressure control valve. Hence, you would not see a decrease in the oil pressure. Perhaps all it means is that there would be higher pressure in the lines between pump and cooler; and at lower oil temps; perhaps enough back pressure to result in bypass at the pressure relief valve just downstream from the pump (Don’t recall what pressure that is; maybe 150 psi?).

On Mon, Jul 5, 2010 at 6:55 PM, Al Gietzen <ALVentures@cox.net> wrote:

I added a Laminova oil/water exchanger. It is connected to the coolant return line and in series with the oil/air exchanger. I measured a 10* increase in coolant temp through the exchanger. I haven't measured the oil temp drop yet. However I estimate the oil temp drop through the exchanger to be 20-25*.

Mark

All sounds good. I also have a Laminova H.E (C43-330)., and after down-loading the performance charts, and looking at the flow/pressure drop data; I chose to plumb it in parallel. It is designed for typical piston engine oil flows, and will give some pressure drop in our rotary use. Measuring your oil pressure at the return to the engine, don’t be surprised if you see a lower number than before.

At 6000 rpm (about 15 gpm oil flow) they show 10-12 psi drop with oil at 250F. Don’t know what it is with oil at 150F.