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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2106314@logan.com>
Subject: Re: [FlyRotary] Re: RV-7A cooling
Date: Sat, 16 Jun 2007 12:13:23 -0400
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Hi Dennis,

My oil pressure will tend to drop when the oil gets to 200F by about the 
same amount 5-7 psi. I don't believe this is caused by foaming but by 
temperatures.    This is fairly normal when your oil gets hot.  At cruise my 
oil pressure runs at 65-70 psi with the stock pressure regulator and oil 
temps around 165-180F.   I forgot to ask(and can't remember)  are you using 
a thermostat or not?

If you are using a thermostat then your coolant temps are what I would 
expect in Cruise, but your oil is still higher than I would feel comfortable 
with for long duration.  If you were just seeing that on take off then I'd 
say fairly normal, but the oil temps should come down in cruise at least to 
the 180F region (in my opinion).

Ed
----- Original Message ----- 
From: "Dennis Haverlah" <clouduster@austin.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, June 16, 2007 10:06 AM
Subject: [FlyRotary] Re: RV-7A cooling


> Ed,
>
> The temperatures were in cruise.  I modified my lower inlet duct to 
> provide a deeper wedge under the oil cooler and a tighter wedge under the 
> water cooler.   I'll post a couple of picutres today.  Is the oil pressure 
> OK compared to your experience?
>
> Dennis H.
>
> Ed Anderson wrote:
>
>> Oil temp is a bit higher than I would like.  Its not clear to me whether 
>> these temps are during or right after the climb or during cruise.  I 
>> presume they are a result of climb conditions and that cruise temps are 
>> lesser? Your coolant temps sound fine to me under those conditions if 
>> that's the temp during climb - if during cruise then I think its a bit 
>> high.
>>
>> Did you by any chance attempt to divide your plenum vertically to provide 
>> more air for the oil cooler?
>>
>> Ed
>>
>>
>> ----- Original Message ----- From: "Dennis Haverlah" 
>> <clouduster@austin.rr.com>
>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>> Sent: Friday, June 15, 2007 11:35 PM
>> Subject: [FlyRotary] RV-7A cooling
>>
>>
>>> I've made more progress toward good cooling but have a long way to go. 
>>> At an OAT of 92 F I was able to climb to 5500 feet and cruse at 23 
>>> inches MP. Water was 195 F and Oil went up to 209 - 210 F.
>>> Oil pressure was 60 psi.  I noticed my oil pressure went down to about 
>>> 58 psi as the oil pressure approached 210.  This was after about 20 
>>> minutes of flight.  Is this an indication of oil foaming?  Also, is this 
>>> too low oil pressure at 5500 rpm?
>>>
>>> Now for the question:  I want to measure (in flight) air pressure to 
>>> determine if my outlet is maybe too small.  Any suggestions as to what I 
>>> should be measuring?  Static pressure near the outlet in the cowl vs. 
>>> ambient static pressure ? That is my first guess.  Any other ideas??
>>>
>>> Thanks,
>>>
>>> Dennis H.
>>>
>>> PS - Pictures of my newest inlet design coming soon.
>>>
>>> -- 
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub: 
>>> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>
>>
>>
>> -- 
>> Homepage:  http://www.flyrotary.com/
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>>
>
> --
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