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  #21  
Old 12-13-2009, 05:09 AM
G3i Ignition's Avatar
G3i Ignition G3i Ignition is offline
 
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Location: Littleton, Colorado
Posts: 182
Default Pre-lube & pressure feed location

Pre-Oiling is to lubricate (create a oil film on bearings, etc.) prior to any rotation of any parts. And have instant oil pressure on crank/start up. Pulling the prop thru several times prior to starting is just wiping the last shut down oil lubrication from all bearing and lifter contact surfaces. So when starting, you just removed quite a bite of left over lubrication.

Ron,
Good place to tap in for the accumulator is the rear of the oil filter adapter next to the thermostatic valve. Some have a pressure or temp. sender there. This can be drilled out and re-tap for a #10an fitting with a ??pipe connection. Just want to make sure that the acc. Oil is going to the flow to the bearings and no off pre-lubing the oil cooler and lines. I see if I have some pics on how I did this mod.

Thomas Shpakow
www.g3ignition.com
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  #22  
Old 12-13-2009, 12:14 PM
bharral bharral is offline
 
Join Date: Mar 2005
Posts: 22
Default

Good Afternoon Thomas,

Thanks very much for some actual data on the accumulator installation. I have always wondered about the "lubrication rate" on the Lycomings. From your data it sounds like a 3 qt accumulator plumbed into the oil filter adapter will provide 20 seconds of oil pressure to allow maneuvering in the zero or negative-g region. That would be assuming the hot oil flow rate with the engine stopped (the data you quoted) is not very much different from the hot oil flow rate with the engine running - not sure about the validity of that assumption.

However, if 20 seconds were available, that would suit my purposes just fine.

Assuming that you isolate the accumulator before shutdown (to hold the oil for pre-oiling prior to next start), what oil level do you run your lycoming sump (perhaps 5 qts in the sump and 3 in the accumulator?)

Regards,
Blake
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  #23  
Old 12-13-2009, 04:06 PM
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G3i Ignition G3i Ignition is offline
 
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Location: Littleton, Colorado
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Default IO-540 Supercharger & Manifold Oil Capacity

Quote:
Originally Posted by bharral View Post
Good Afternoon Thomas,

Thanks very much for some actual data on the accumulator installation. I have always wondered about the "lubrication rate" on the Lycomings. From your data it sounds like a 3 qt accumulator plumbed into the oil filter adapter will provide 20 seconds of oil pressure to allow maneuvering in the zero or negative-g region. That would be assuming the hot oil flow rate with the engine stopped (the data you quoted) is not very much different from the hot oil flow rate with the engine running - not sure about the validity of that assumption.

However, if 20 seconds were available, that would suit my purposes just fine.

Assuming that you isolate the accumulator before shutdown (to hold the oil for pre-oiling prior to next start), what oil level do you run your lycoming sump (perhaps 5 qts in the sump and 3 in the accumulator?)

Regards,
Blake
Blake,
Your correct, 4-1/2 to 5-1/2 qts in the sump (acc.full charge @ 3qts.) when I go fly Acro. Cross country normal wings level ride 7 to 7-1/2 in the sump. My oil sump is modifide and very shallow for the supercharger install and that's why I don't see a whole bunch difference on the inflight loss of oil pressure during acro. After a oil service with 9qts in the sump my dip stick reads just slightly over 12qts. The 3qts that I lost in the mod., just went into the acc.

Thomas Shpakow
www.g3ignition.com

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