Notes on Group 2800 Heavy Duty Gold Oil Systems.

Builders:

Below are general notes and references for greater understanding on the Group 2800 Heavy Duty oil cooler group. If you have further questions, do not hesitate to call or write.

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Above are two views of the optional Gold HP Oil Cooler Bypass. Part number 2802. It is often referred to as a Sandwich Adapter because when installed, it’s sandwiched between the Gold Oil Filter Housing and the oil filter. It’s held in place by a very accurately machined, hollow mounting bolt. It can be installed on the Gold Oil Filter Housing in literally one minute. It includes a square o-ring gasket, held in place in a deep recess. The AN-6 fittings for the lines to and from the cooler can be clocked in any position. It contains an all metal cooler bypass featuring a precision spring manufactured by the nation’s foremost supplier of aerospace springs. On a normal start cycle, the cool oil in the cooler will produce a pressure drop in excess of 7 psi. Any time this is so, this bypass valve senses the pressure differential and allows the oil to bypass the cooler, greatly speeding up the elapsed time until the oil reaches 150F.

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Mounting: The side of the #2802 with the o-ring touches the Gold oil filter housing #2601.

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Torque: The hex head on the mounting nipple is 1-1/8″. This does not have a torque value. It is screwed down ( with oil on the threads ) until the o-ring contact the filter housing face, and then it is tightened 3/4 of one turn.  It has about 2 turns of thread engagement, but a 20mm steel fitting has very little chance of being overstressed.

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Clock Position: Pictured below are several common examples of clock position. Functionally it does not matter for operation, however we have carefully studied the complete cowled installation and operation of each of these, and highly recommend using the orientations shown on the specific airframes.

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Hose Orientation: Also refer to the pictures to study the hose installation. The hose sets we sell fit in a particular way.  Oil coolers do not care which direction oil flows through them, you could connect either end of the cooler to either port on the #2802, and it would work the same, but the hoses ends and lengths are set for a particular layout.

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Above, #2802, oriented straight up. This installation is on a Wagabond, however the Panther is done the same way. There is no particular advantage to any orientation, it doesn’t alter the flow in any way, it is most commonly dictated by available baffling height to the cowl. Oil cooler is not yet installed in photo.

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Above, #2801 cooler shown in Group 2800 installation. This is on a Zenith, and all Zeniths use this pair of hoses and #2802 orientation. It is clocked just slightly above horizontal. Notice that the only 90 degree hose end is on the bottom of the cooler, all the others are 120 degree. These hoses and parts are designed to work perfectly with baffle kits from J.S. Weseman.

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 Above, the ‘Zenith’ orientation of hoses and clock position of the #2802, seen from the distributor side of the engine.  Both hoses are 120 degree fittings on this end. Oil filter not yet safety wired. It needs to be wired back to the mounting bolts on the #2601 housing, as wiring it to the #2802 would not stop the rotation potential between the #2802 and the #2601.

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Below are a list of stories which can be read in 60 minutes which will provide greater understanding of the installation and operation of these systems. If you are looking at a printed version of this page, type the title of the story into the search box in the upper left hand corner of my blog, FlyCorvair.net to read the information.

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Thoughts on cold weather operation, minimum oil temps, etc. -operational information on these systems

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WARNING: 1/8-NPT thread weight limit. -A very important warning about limiting weight on threads.

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Heavy Duty Gold Oil Systems, new cooler model.– a look at the Group 2800 systems.

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Gold Oil Filter Housing, Standard and Reverse – the Group 2600 systems which support the 2800 group.

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Corvair Oil System, information on oil pressure gauges. – answering questions on instrumentation.

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Can’t read instructions? – a warning on following directions and learning that aviation has penalties for people who ignore details.

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-wewjr.

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Weekend work. 

Builders,

Vern and I spent the weekend on steady College prep work. I am departing Wednesday, and things are on track for a very good event. We made a number of parts, but also made small improvements to building tools and the run stand. Paul Salter came over to load tools into his truck, and Travis the welder from SPA helped out for most of Saturday. I appreciate the positive and thoughtful comments builders shared, they went well with a weekend rich in friends.

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Above, Ten HV-2000 oil housings going together on Sunday night.

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wewjr.

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