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07-27-2016, 04:16 PM
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Join Date: Oct 2007
Location: Salmon Arm, BC
Posts: 933
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Quote:
Originally Posted by Sylvainsting
Did somebody use only the half Raven with success ?
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Yep, I installed a Half Raven on my Rocket. Made a significant difference. I previously was using an Andair oil separator, but still got oil on the belly with minor zero or negative g excursions. Now the belly stays clean! Highly recommended!
__________________
Mark Olson
1987 RV-4 Sold
2003 Super Decathlon - Sold
F1 EVO Rocket, first flight May 31/14
First in line for the Sonex JSX-2T kit
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07-27-2016, 11:01 PM
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Join Date: Nov 2014
Location: In the center of France
Posts: 90
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Oil pressure
Thank you mark.
And what about your oil pressure ? Did you experimente low oil pressure when you are at zero or negative G ? Is it dangerous for the engine ?
__________________
Location: France
RV7 QB (F-PSED), Tip Up, Aerosport IO-375, James Cowl, WW 200RV, Dynon Skyview, VP-X sport, Day VFR,
Flying...
Phase 2
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07-28-2016, 10:31 AM
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Join Date: Oct 2007
Location: Salmon Arm, BC
Posts: 933
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I have not seen any significant low pressure, however I don't stay negative for more than a second or so. The biggest danger in my mind is the potential for the prop to lose oil pressure and the engine rpm to exceed limits, so must be careful!
__________________
Mark Olson
1987 RV-4 Sold
2003 Super Decathlon - Sold
F1 EVO Rocket, first flight May 31/14
First in line for the Sonex JSX-2T kit
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08-26-2016, 05:46 AM
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Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
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No massiv oil pressure drop on negative
Hello
I will convert to a half Raven system soon ... because I lost to much oil out of the engine and onto the belly. Also the rear fuselage inside got covered
What I can say, during two wrong flown hammerheads and two flown correctly, I lost about 2 quarts of oil. Quite a bit shocked after landing and seeing the mess
Then I analysed the data about the oil pressure during this flight. I have from the engine monitor all second a measurement. The lowest oil pressure was 32 PSI , so I think it does not harmed the engine for the 1-3s where it was that low.
But to stay more save and unwilling to clean such a mess again, I will go with a half Raven system.
Dominik
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08-26-2016, 07:06 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by swisseagle
Hello
I will convert to a half Raven system soon ... because I lost to much oil out of the engine and onto the belly. Also the rear fuselage inside got covered
What I can say, during two wrong flown hammerheads and two flown correctly, I lost about 2 quarts of oil. Quite a bit shocked after landing and seeing the mess
Then I analysed the data about the oil pressure during this flight. I have from the engine monitor all second a measurement. The lowest oil pressure was 32 PSI , so I think it does not harmed the engine for the 1-3s where it was that low.
But to stay more save and unwilling to clean such a mess again, I will go with a half Raven system.
Dominik
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What engine and RV model do you have?
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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08-26-2016, 07:47 AM
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Join Date: Mar 2009
Location: Arvada, CO
Posts: 118
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I will be looking at a half Raven system, too. Great thread! As an aside, there is one other option to fuel injection for sustained inverted flight. My Ellison Throttle Body Is a simple, low pressure system that runs happily in any flight attitude. Now I just need to resolve the oil mess issue.
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Jimzims
2015 RV7 I0-360 FP
Dues gladly paid, 2020
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10-29-2016, 11:19 PM
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Join Date: Dec 2012
Location: Greenback, TN
Posts: 534
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Brass vs aluminum fittings
Is there a reason to use brass fittings on the seperator rather than aluminum?
__________________
Marvin McGraw, 5TN4
RV-14. #140039 Complete
Flight hours: 500+
2020 Dues Paid
The Dues Paid note is a reminder for me
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10-30-2016, 03:25 AM
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Join Date: Mar 2006
Location: Gilbert, AZ
Posts: 1,628
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Quote:
Originally Posted by M McGraw
Is there a reason to use brass fittings on the seperator rather than aluminum?
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If you can find aluminum or steel fittings they work just fine. Large hose barbed fittings may be difficult to find except in brass.
__________________
Ron Schreck
IAC National Judge
RV-8, "Miss Izzy", 2250 Hours - Sold
VAF 2021 Donor
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10-30-2016, 06:54 AM
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Join Date: Dec 2012
Location: Greenback, TN
Posts: 534
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Thanks
Quote:
Originally Posted by ronschreck
If you can find aluminum or steel fittings they work just fine. Large hose barbed fittings may be difficult to find except in brass.
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Thanks for the reply.
__________________
Marvin McGraw, 5TN4
RV-14. #140039 Complete
Flight hours: 500+
2020 Dues Paid
The Dues Paid note is a reminder for me
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10-30-2016, 09:07 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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One thing to note.
Quote:
Originally Posted by M McGraw
Is there a reason to use brass fittings on the seperator rather than aluminum?
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Mostly available in any material, I used the least expensive. One thing - the top of the Raven tank connects to the top of the accessory case. If you are not planning on going full inverted, and attach to the typical breather port, then pay attention. The Raven top outlet is 1/2 NPT, the accessory case is 3/8" NPT (IO360 M1B). 3/8"NPT to hose is for 5/8" id hose. The 1/2"NPT is for 3/4" id hose. I could NOT find any fittings with a common hose ID, and used a bushing in the top of the tank to allow a 90 deg 3/8"NPT X 5/8" hose fitting.
If you want to go back to the accessory pad using the Raven or Christen adapter, then it is 1/2" NPT and you can use the 3/4" id hose. More $ unless you already have the pad adapter.
I sourced some fittings from Hoerr Racing. They have lower prices than Summit.
https://www.hrpworld.com/store/
I think I have some unused 90 deg fittings if you are interested, email me.
edit - total truth is i did find one straight brass fitting for $45 that is used for coolant on street rods. It is only in straight. It was 3/8"NPT X 3/4" hose id - I needed a 45 deg as 90 would not fit and straight was not suitable for hose routing on my 7. The fittings are made for the heater hose from the intake manifold.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 10-31-2016 at 06:16 PM.
Reason: added engine type based on Marvins post below.
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