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n230rc(at)gmail.com
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 Posted: Fri Feb 08, 2008 7:17 am Post subject: Rocket-List Digest: 3 Msgs - 02/07/08 |
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4.5 qts in 2.5 hrs is potentially catastrophic!! There is something SERIOUSLY wrong with your engine. Here are a few ideas.
You do know the engine is not designed to fly zero or negative G's with out an inverted oil system, right? even mild negative G's will throw oil out of the sump and down the vent and onto your belly.
Your normal operating ( warm) oil pressure should be 65-75 psi.
Next, a compression check tells you that the rings, valves and cylinder heads are not broken, leaking or cracked. I am a little suspect of the compression check if it was done when the engine was HOT. It should be done when the engine is at normal operating temp such as 385 F or less.I think you could conceivably get a good compression check on a hot engine that has choked cylinders even though the rings were cracked.
If I recall correctly- Lycoming plain steel cylinders are choked .017 in from the base to the top. This could allow more blow by at the bottom of the stroke than at the top. are your cyl's choked? Try a compression check at bottom dead center and see how much they leak.
Next, The oil sump and pick up system in these engines is dead simple. There isint much to go wrong here assuming you dont have an inverted system.
Run your vent line as high as possible before it turns down to exit the cowl. A little more up hill distance in the tube will allow more oil to drain back into the engine before making it over the hump and out of the engine. These tubes often have coil springs inside to prevent collapse at tight bends. Is yours collapsed anywhere?
The vent line hould be 3/4" id. Smaller diameters will let the oil bridge in the tube and consequently blow out the tube easier.
An experiment- Add a length of hose to the vent tube, run the engine and see how much blow by you are getting. It should feel like a light smooth air stream- hardly perceptable.
Thats all I can think of. If you are not flying negative G's and are loosing as much oil as you say you are, you have a serious engine malfunction. These engines are tough but not actually bullet proof. FYI- some of this oil is leaking into all the sheetmetal joints it runs over and will stink up your planes' interior. Keep it clean until you get it fixed.
Good luck. I really want to hear about the solution. Keep us posted.
Ron Carter
Skypark Airport, Bountiful, UT
HR2 # 49 675 TTSN
On 2/8/08, Rocket-List Digest Server <rocket-list(at)matronics.com (rocket-list(at)matronics.com)> wrote: [quote]*
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Total Messages Posted Thu 02/07/08: 3
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Today's Message Index:
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1. 07:37 AM - Re: Rocket-List Digest: 2 Msgs - 02/06/08 (Bob & Toodie Marshall)
2. 06:51 PM - ()
3. 10:01 PM - Re: (nico css)
________________________________ Message 1 _____________________________________
Time: 07:37:56 AM PST US
From: "Bob & Toodie Marshall" <rtmarshall(at)osbtown.com (rtmarshall(at)osbtown.com)>
Subject: Re: Rocket-List Digest: 2 Msgs - 02/06/08
Its called the wife's turn, looking to do something different. Its a
beautiful ship, all the good stuff while being built, a thinking mans
airplane, Anyway contact me off list if anyone's interested. I do not want
to burn the bandwidth here on the list. Bob
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GStone57(at)comcast.net
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| Posted: Fri Feb 08, 2008 12:11 pm Post subject: Rocket-List Digest: 3 Msgs - 02/07/08 |
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How far your vent tube extends into the airstream and how it is cut can change this dramatically!!
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