REFLECTOR:Oil Congealing -- Is our Nose Cooler "Sandwich Pick-off" Protected?

[Scott]

Bob,

No modern(later than 1965?) airplane has a congealing oil cooler on it, or 
maybe I should say, can't imagine any one actually installing one on a new 
airplane such as our homebuilts.

Unless your in the Arctic, or using straight grade oil with an old old 
fashioned congealing type cooler,  the problem is purely hypothetical.

We all read about quite a few ingenious solutions to these hypothetical 
problems on this list.

The bypass valve is part of the veritherm so it doesn't matter if your 
remote filter unit has one. I know my Air Wolf remote filter unit has no 
bypass valve.

Scott



At 04:30 PM 11/30/2003, you wrote:
>Thanks for the thoughts and info about oil congealing.  I think in most
>cases Scott is right -- it's a non-issue.  Especially if your situation is
>"normal" in terms of engine/airplane set-up and operating scenario.  For
>example, in normal weather, altitude, and flight duration conditions the
>on-engine cooler's Vernitherm (at least my IO-550N has one) should bypass
>oil around that cooler until the engine is up to normal operating
>temperature, and once the Vernitherm is open the hot oil flow through the
>cooler should prevent oil congealing under normal conditions.
>
>But, as Richard's story points out, there may be unusually cold weather
>conditions combined with unusually long, high altitude flight legs (and
>maybe this was an engine without the pressure bypass valves on the oil pump
>screens and cooler that Scott's article describes?) where the oil can still
>congeal in the main oil cooler, even while flying!
>
>Another issue is whether or not the standard "sandwich oil router" that fits
>under the oil filter and we use on the Velocity to send and receive engine
>oil to/from the nose cooler includes it's own high pressure bypass valve.
>If not, and if the nose cooler lines or the cooler itself contains congealed
>oil, it might be very difficult or impossible to establish normal engine oil
>flow and cooling due to a congealed oil "obstruction".
>
>Does anyone know if the "sandwich oil router" that we use for the nose oil
>cooler lines contains it's own Vernitherm and/or pressure relief bypass
>valve?
>
>Bob Jackson
>Velocity XL-RG
>N2XF
>
>
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