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12-10-2009, 05:42 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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all ports are pipe thread
All three of those ports have a pipe thread in them. IIRC, it is a 3/8 NPT. Use AN flare-pipe thread adapter fittings.
My IO-360-A1A manual shows either A or C as OK for the "to cooler" port. The B port is always for oil return from cooler. Either way, the oil goes through the spin-on oil filter housing first, and the vernatherm is installed in that housing. When the Vernatherm closes, it sends the oil into the passage that feeds both the A and C ports. When the vernatherm is open, it allows oil to go straight to the pressure regulator passage, bypassing the cooler.
Correction: What Dan said below is correct - my mistake - the oil goes through the filter AFTER coming back from the cooler (or straight from the pump if the vernatherm is open). But Both ports A and C still do the same thing - they send oil to the cooler when the vernatherm is closed.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
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Last edited by scsmith : 12-10-2009 at 07:18 PM.
Reason: added correction
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12-10-2009, 06:15 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by hcccs
Connecting the cooler to the A port means that it will cool all the time.
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It is true that some oil is always flowing through the cooler. When cold it is a small quantity. When hot it is the entire pump output.
Quote:
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If I understand it right, the Vermitherm valve will regulate the amount of oil that will flow into the oil cooler.
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Cold oil has two open pathways. Some oil takes port A and flows through the cooler to port B. Some continues up the vertical passage past port A to the back of the filter adapter housing where it passes through the fully open vernatherm bypass port. The path through the cooler has far more flow resistance than the bypass path, in particular when cold. Most of the oil takes the bypass.
As the oil warms the vernatherm extends, progressively closing the bypass port. More oil flows through the cooler.
When the oil is hot it can only take the port A path because the vernatherm bypass port is closed. All oil flows through the cooler.
Key concept: The vernatherm controls flow to the cooler by how much it blocks the alternate passage.
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Dan Horton
RV-8 SS
Barrett IO-390
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12-10-2009, 06:29 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Recommend a review of the schematic leading this thread:
http://www.vansairforce.com/communit...ight=schematic
Always much confusion about Lycoming accessory case oil flow.
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Dan Horton
RV-8 SS
Barrett IO-390
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12-11-2009, 04:03 AM
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Join Date: Apr 2008
Location: Stockholm, Sweden
Posts: 164
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Quote:
Originally Posted by DanH
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Thank you all for the info. If the 'A' and 'C' port do the same thing I will go for the 'A' port. It will make things easier.
The 'C' port doesn't seem to have a pipe thread at all. I tried a -8 fitting in the 'C' port but it wouldn't go in.
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Hans Str?hle
Jodel sold (SE-XEV)
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Sweden
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12-11-2009, 06:09 AM
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Join Date: Apr 2008
Location: Stockholm, Sweden
Posts: 164
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Final
Quote:
Originally Posted by DanH
It is true that some oil is always flowing through the cooler. When cold it is a small quantity. When hot it is the entire pump output.
Cold oil has two open pathways. Some oil takes port A and flows through the cooler to port B. Some continues up the vertical passage past port A to the back of the filter adapter housing where it passes through the fully open vernatherm bypass port. The path through the cooler has far more flow resistance than the bypass path, in particular when cold. Most of the oil takes the bypass.
As the oil warms the vernatherm extends, progressively closing the bypass port. More oil flows through the cooler.
When the oil is hot it can only take the port A path because the vernatherm bypass port is closed. All oil flows through the cooler.
Key concept: The vernatherm controls flow to the cooler by how much it blocks the alternate passage.
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When I saw your schematic this is what I thought - oil flowing both ways but regulated by the Vernatherm. I'll use the 'A' port and plug the 'C' port.
What would I do without all knowlegable people in VAF Forum.
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Hans Str?hle
Jodel sold (SE-XEV)
RV-4, flying any day (SE-XJJ)
F?rentuna, Stockholm
Sweden
EAA222
2020 =VAF= $20 donation paid
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12-11-2009, 10:23 AM
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Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,393
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OIL COOLER
Just checked an 0 320 acc case. While C might appear to accept a pipe thread fitting, it will not. This a straight thread hole for the plug and gasket as posted by Dan. The post by scsmith is incorrect regarding C. The two Lycoming 0 320 "installation drawing rear view" that I have do not show C at all.
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12-17-2009, 01:25 PM
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Join Date: Mar 2006
Posts: 86
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Thermal prob on "C"
Guys, I am currently undergoing the same investigation. I have an factory direct IO360-M1B. The "C" hole is actually located on the filter accessory housing that bolts onto the accessory case. I also tried to assemble a -8 AN fitting into the "C" opening. It does not appear to be a NPT thread. So I am thinking this is where the oil temperature probe is assembled? That seems to be the only logical answer to me. The manual that came with my Lycoming doesn't illustrate any of this. If that is not right, then where does the oil temp prob typically go? Will that come with my EFFIS EIS install kit?
Thanks,
Brad
RV-8
Austin
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12-17-2009, 02:10 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by flyingbeaver26
I have an factory direct IO360-M1B. The "C" hole is actually located on the filter accessory housing that bolts onto the accessory case.
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Unlikely. Study two common oil filter adapter styles in the thread with the schematic, referenced above.
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Dan Horton
RV-8 SS
Barrett IO-390
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12-17-2009, 04:43 PM
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Join Date: Mar 2006
Posts: 86
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Quote:
Originally Posted by DanH
Unlikely. Study two common oil filter adapter styles in the thread with the schematic, referenced above.
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Dan, This picture is of an oil filter accessory housing. Notice it has a oil temp probe location. This is the thread that I am referring to. This one just happens to be a right angle version as mine is a parallel version. My point is that I think that this thread for the temp sensor is not a NPT pipe thread. Therefore I'm guessing it must be for the temp probe that uses a slightly different thread. Therefore the "C" orifice in the original picture might also likely be a temp sensor attach point. Possible? Can anybody confirm what the threads on a oil temp probe look like? I don't own one yet.
Thanks,
Brad
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12-18-2009, 05:34 AM
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Join Date: Mar 2006
Location: Gilbert, AZ
Posts: 1,628
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I have been researching this topic because I want to plumb in an oil accumulator. Port "C" is the logical place to connect. This is not a NPT threaded port. It is a straight/bolt thread. Does anyone know of a source for a fitting that will connect this port to a #8 flare?
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Ron Schreck
IAC National Judge
RV-8, "Miss Izzy", 2250 Hours - Sold
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