Mailing List Message #65338
From: lehanover <>
Subject: Re: [FlyRotary] Re: Renesis oil pressure
Date: Fri, 15 Nov 2019 16:59:52 +0000 (UTC)
To: <>
Any early regulator can be shimmed to over 100 PSI. We ran 100 PSI with Redline 40 weight.  RX-8 came stock with 110 PSI. Early valves can be dismantled  and shimmed to anything you want. RX-8 valves are welded shut. Most racers have a drawer or box of early valves. Check your local SCCA for member help.
Lynn E. Hanover

In a message dated 11/15/2019 10:36:08 AM Eastern Standard Time, writes:


Anyway, thank you all for your replies. Sounds like a 150 psi sensor will be the safest.

I have no plans to tear down the supposedly brand new Renesis, so for now no modifications.

Thinking about a before cooler pressure sensor too. I suppose the only (easy) option is to drill and tap the oil metering pump supply hole (which I've already plugged)?

I would like to also have a before oil cooler temperature sensor. I guess I need to find a spot in the oil pan?

I suppose a 30 psi sensor is adequate for water pressure (assuming I don't go with Evans non-pressurized system)?

Trying to source sensors, I looked in the places I had purchased them decades ago (Newark, DigiKey, Allied) and was dismayed at the availability and prices. In my original RV-3 I had used the solid state MPX-5999 with barb from NXP USA.

A Google search finally lead me to a posting which led me to Aircraft Spruce and a "Swift" pressure sensor. That led me to eBay where there now is a wide selection of 5V (amplified) solid state sensors with 1/8-27NPT housings.

These solid state sensors have (amplified) output voltages from 0.5 to 4.5 volts with a 5 volt supply (they even come in 12V (10-25V) supply version for a bit more).
Yes, your engine monitor has to subtract (offset) the bottom by 0.5 volts (0 psi = 0.5 volts).â“‚mTKFrDgAsPLl-bZmKbUTKgQ

When searching note that oil pressure switches are often called sensors too.


On 11/15/2019 7:36 AM, Bobby J. Hughes wrote:
Thermal pellet and carb jets with racing beat race regulator. Idle at 28 warm and 88-92 psi at 4800-7000 rpm.??


Sent from my iPhone

On Nov 15, 2019, at 2:43 AM, Matt Boiteau <> wrote:

I installed an RX7 rear regulator and shimmed the front reg with 2 washers. Also installed thermal pellet and weber jets in the e-shaft. Average around 110-115psi during cruise, so I went with an 150psi sensor.

- Matt Boiteau

On 2019-11-14 11:53:30 PM, Neil Unger <> wrote:

Fin,?? My renesis starts cold at 150 PSI.?? I let it idle at 2200 rpm
until after a few minutes it settles to 80 psi (plus).


On 11/15/2019 10:45 AM, Finn Lassen wrote:
> I'm starting to look at engine monitor sensors for my RV-4.
> In his Renesis report, Tracy mentioned 100 psi oil pressures. Not
> clear if they dropped after the engine got some hours on it.
> What kind of oil pressures are you seeing?
> Should I go with a 150 psi or a 100 psi pressure sensor?
> Finn
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