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  #31  
Old 07-27-2016, 04:16 PM
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SMO SMO is offline
 
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Location: Salmon Arm, BC
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Quote:
Originally Posted by Sylvainsting View Post
Did somebody use only the half Raven with success ?
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!
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  #32  
Old 07-27-2016, 11:01 PM
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Sylvainsting Sylvainsting is offline
 
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Default 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 ?
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  #33  
Old 07-28-2016, 10:31 AM
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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!
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  #34  
Old 08-26-2016, 05:46 AM
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swisseagle swisseagle is offline
 
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Location: 20km outside of Zurich, Switzerland
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Default 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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  #35  
Old 08-26-2016, 07:06 AM
BillL BillL is online now
 
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Location: Central IL
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Quote:
Originally Posted by swisseagle View Post
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
What engine and RV model do you have?
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Lord Kelvin:
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and express it in numbers, you know something about it; but when you
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  #36  
Old 08-26-2016, 07:47 AM
Jimzim Jimzim is offline
 
Join Date: Mar 2009
Location: Arvada, CO
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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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  #37  
Old 10-29-2016, 11:19 PM
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Default Brass vs aluminum fittings

Is there a reason to use brass fittings on the seperator rather than aluminum?
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  #38  
Old 10-30-2016, 03:25 AM
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ronschreck ronschreck is offline
 
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Quote:
Originally Posted by M McGraw View Post
Is there a reason to use brass fittings on the seperator rather than aluminum?
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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  #39  
Old 10-30-2016, 06:54 AM
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M McGraw M McGraw is offline
 
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Quote:
Originally Posted by ronschreck View Post
If you can find aluminum or steel fittings they work just fine. Large hose barbed fittings may be difficult to find except in brass.
Thanks for the reply.
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  #40  
Old 10-30-2016, 09:07 AM
BillL BillL is online now
 
Join Date: Sep 2007
Location: Central IL
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Default One thing to note.

Quote:
Originally Posted by M McGraw View Post
Is there a reason to use brass fittings on the seperator rather than aluminum?
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.
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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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