Author: Barry AV8R <aa5_av8r@...> Time: Mon Dec 13, 2004 8:25 am PST Link
Hello Flight:
Well, the Proof is on the Dipstick.
I just did a nice long x/c flight from Somerset (SMQ), NJ to Forest (W90), Va. I got up to 7500’ above the clouds with an OAT of 33 Deg F. CHT were good ~350 @2500 RPM and EGT of ~ 1400 Deg F.
The OIL temps were VERY low ... as low as 138 Deg F and only max'ing out 165 during takeoff & climb.
After landing I pulled the dipstick to find TAN FROTH on it. This is a case of water in the oil that DID NOT vaporize because of low oil temperatures. I would also say the water content was high because of the Oil/Air Separator I have on the plane. Being that the water did not vaporize it could not be dumped over board and it was returned back to the engine.
On the return trip three factors changed in this equation: 1) I did not get as high only to 5500’. 2) Because of the lower altitude the OAT was higher – 40 Deg F, and 3) I put a small Band-Aid (REALLY) a Band-Aid on the oil cooler. That’s all that I had with me. The oil temps went up to 153 to 162 and stayed in that region for the trip home. After landing the FIRST thing I did after shutting down was check the Dipstick. Guess what? Oil back to normal color and NO trace of moisture.
So, before this winter really gets cold, I’m putting on a bit of more and better tape on the cooler.
No, I’m not going to remove the Oil/Air separator ... Just maintain the engine in the proper temperature range.
Barry
RV-6A
180HP
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Author: Mike Thompson <grobdriver@...> Time: Mon Dec 13, 2004 10:14 am PST Link
You might also consider not returning the separated oil back into the engine. It's pretty easy to incorporate a reservoir to the oil output of the separator and simply empty it once in a while.
There is probably moisture condensing in the separator that you are draining into the engine - the product of the moisture boiled out of the oil and released as vapor.
- Mike
Barry AV8R <aa5_av8r@yahoo.com> wrote:
Hello Flight:
Well, the Proof is on the Dipstick.
I just did a nice long x/c flight from Somerset (SMQ), NJ to Forest (W90), Va. I got up to 7500’ above the clouds with an OAT of 33 Deg F. CHT were good ~350 @2500 RPM and EGT of ~ 1400 Deg F.
The OIL temps were VERY low ... as low as 138 Deg F and only max'ing out 165 during takeoff & climb.
After landing I pulled the dipstick to find TAN FROTH on it. This is a case of water in the oil that DID NOT vaporize because of low oil temperatures. I would also say the water content was high because of the Oil/Air Separator I have on the plane. Being that the water did not vaporize it could not be dumped over board and it was returned back to the engine.
On the return trip three factors changed in this equation: 1) I did not get as high only to 5500’. 2) Because of the lower altitude the OAT was higher – 40 Deg F, and 3) I put a small Band-Aid (REALLY) a Band-Aid on the oil cooler. That’s all that I had with me. The oil temps went up to 153 to 162 and stayed in that region for the trip home. After landing the FIRST thing I did after shutting down was check the Dipstick. Guess what? Oil back to normal color and NO trace of moisture.
So, before this winter really gets cold, I’m putting on a bit of more and better tape on the cooler.
No, I’m not going to remove the Oil/Air separator ... Just maintain the engine in the proper temperature range.
Barry
RV-6A
180HP
Michael E. Thompson (Grobdriver@yahoo.com)
Austin, TX, USA
RV-6 N140RV, FLYING!
Ex-AX1 Sub Hunter, P-3 (B/B-TACMOD/C) Orion Aircrew,
PP-G,ASEL, Motorglider Driver and Unlimited Air Race Nut!
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Author: Barry AV8R <aa5_av8r@...> Time: Mon Dec 13, 2004 4:52 pm PST Link
Mike:
If the separator was not performing its function as required and desired I would remove the separator completely. I do not see any reason why I should keep the separator and as you suggested, ADD a reservoir, which is extra weight and an extra maintenance operation. When all that is required is to keep the engine oil within the proper operational temperature range. Which is easily accomplished by a small piece of aluminum or aluminum tape covering about a 2” wide area on the oil cooler. If all I wanted was a clean belly of the plane there are other ways to accomplish that.
Barry
Mike Thompson <grobdriver@yahoo.com> wrote:
You might also consider not returning the separated oil back into the engine. It's pretty easy to incorporate a reservoir to the oil output of the separator and simply empty it once in a while.
There is probably moisture condensing in the separator that you are draining into the engine - the product of the moisture boiled out of the oil and released as vapor.
- Mike
Barry AV8R wrote:
Hello Flight:
Well, the Proof is on the Dipstick.
I just did a nice long x/c flight from Somerset (SMQ), NJ to Forest (W90), Va. I got up to 7500’ above the clouds with an OAT of 33 Deg F. CHT were good ~350 @2500 RPM and EGT of ~ 1400 Deg F.
The OIL temps were VERY low ... as low as 138 Deg F and only max'ing out 165 during takeoff & climb.
After landing I pulled the dipstick to find TAN FROTH on it. This is a case of water in the oil that DID NOT vaporize because of low oil temperatures. I would also say the water content was high because of the Oil/Air Separator I have on the plane. Being that the water did not vaporize it could not be dumped over board and it was returned back to the engine.
On the return trip three factors changed in this equation: 1) I did not get as high only to 5500’. 2) Because of the lower altitude the OAT was higher – 40 Deg F, and 3) I put a small Band-Aid (REALLY) a Band-Aid on the oil cooler. That’s all that I had with me. The oil temps went up to 153 to 162 and stayed in that region for the trip home. After landing the FIRST thing I did after shutting down was check the Dipstick. Guess what? Oil back to normal color and NO trace of moisture.
So, before this winter really gets cold, I’m putting on a bit of more and better tape on the cooler.
No, I’m not going to remove the Oil/Air separator ... Just maintain the engine in the proper temperature range.
Barry
RV-6A
180HP
Michael E. Thompson (Grobdriver@yahoo.com)
Austin, TX, USA
RV-6 N140RV, FLYING!
Ex-AX1 Sub Hunter, P-3 (B/B-TACMOD/C) Orion Aircrew,
PP-G,ASEL, Motorglider Driver and Unlimited Air Race Nut!
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Author: "rherf39" <rherf@...> Time: Wed Dec 15, 2004 3:36 am PST Link
--- In vansairforce@yahoogroups.com, Barry AV8R <aa5_av8r@y...> wrote:
> You might also want to check your vernatherm that it is operating
correctly, it should not allow oil thru the cooler until it reaches
approx 187 degree's which is the usual setting,as I understand it it
works like a thermostat only for oil instead of water in your car.
> Hello Flight:
> Well, the Proof is on the Dipstick.
> I just did a nice long x/c flight from Somerset (SMQ), NJ to Forest
(W90), Va. I got up to 7500' above the clouds with an OAT of 33 Deg
F. CHT were good ~350 @2500 RPM and EGT of ~ 1400 Deg F.
> The OIL temps were VERY low ... as low as 138 Deg F and only
max'ing out 165 during takeoff & climb.
> After landing I pulled the dipstick to find TAN FROTH on it. This
is a case of water in the oil that DID NOT vaporize because of low
oil temperatures. I would also say the water content was high
because of the Oil/Air Separator I have on the plane. Being that the
water did not vaporize it could not be dumped over board and it was
returned back to the engine.
> On the return trip three factors changed in this equation: 1) I did
not get as high only to 5500'. 2) Because of the lower altitude the
OAT was higher – 40 Deg F, and 3) I put a small Band-Aid (REALLY) a
Band-Aid on the oil cooler. That's all that I had with me. The oil
temps went up to 153 to 162 and stayed in that region for the trip
home. After landing the FIRST thing I did after shutting down was
check the Dipstick. Guess what? Oil back to normal color and NO
trace of moisture.
> So, before this winter really gets cold, I'm putting on a bit of
more and better tape on the cooler.
> No, I'm not going to remove the Oil/Air separator ... Just maintain
the engine in the proper temperature range.
>
> Barry
> RV-6A
> 180HP
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>
> [Non-text portions of this message have been removed]
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Author: Barry AV8R <aa5_av8r@...> Time: Wed Dec 15, 2004 6:03 pm PST Link
Sorry - I did NOT say that!
rherf39 <rherf@earthlink.net> wrote:
<aa5_av8r@y...> wrote:
> You might also want to check your vernatherm that it is operating
correctly, it should not allow oil thru the cooler until it reaches
approx 187 degree's which is the usual setting,as I understand it it works like a thermostat only for oil instead of water in your car.
=====================================
It is not far from accurate but just not accurate. Vernatherms are stamped 85 Deg C for a working point. That is equates to 185 Deg F.
And their operation is quite simular to a radiator T-Stat.
Barry
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