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Date: Sat, 14 Jul 2007 20:18:31 -0400
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Subject: Legacy Oil Temps - SOLUTION?
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Hi-

I'm the guy that started the Legacy Oil Temp thread.? Thanks again to all who responded and the MANY good suggestions.

We have the Performance Engine IO-550 EXP.? We have been running relatively cool cyl head temps vs. higher oil temps.? A solution that has seemingly worked for us was a simple suggestion by Rich Henning. (Thanks Rich!) 

We ran some 1 1/2" SCAT tubing inside the cowl starting just aft of the left side of the left inlet  and it dumps out right at the top left side of the oil cooler (pointing toward the center of the cooler).? 

It doesn't tend to rob any other cooling air but seems to give the oil cooler an unadulterated "breath of fresh air", to supplement what it was already getting on its way over 3 warm cyls.

It's hard to quantify EXACTLY the difference, but after a week of flying and comparing the MVP-50 downloaded engine data from before to after, on a number of different flights, it seems to be an honest 20-25 degrees (F) cooler on average.

A climb from sea level to 9,500 feet out toward the desert near San Diego, on a hot summer day (ISA +37F) can now be done and the oil temp does not go over 200F in climb (197) and cool down from there in cruise.

Cyl head temps remain cool enough in the 330ish range.

I don't know if this is the end-all solution...... but it's good enough to get me to OSH.? 

Hope to see you there!!!

Regards,

Erik Larson
Legacy
N74FX


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Hi-<br>
<br>
I'm the guy that started the Legacy Oil Temp thread.&nbsp; Thanks again to all who responded and the MANY good suggestions.<br>
<br>
We have the Performance Engine IO-550 EXP.&nbsp; We have been running relatively cool cyl head temps vs. higher oil temps.&nbsp; A solution that has seemingly worked for us was a simple suggestion by Rich Henning. (Thanks Rich!) <br>
<br>
We ran some 1 1/2" SCAT tubing inside the cowl starting just aft of the left side of the left inlet  and it dumps out right at the top left side of the oil cooler (pointing toward the center of the cooler).&nbsp; <br>
<br>
It doesn't tend to rob any other cooling air but seems to give the oil cooler an unadulterated "breath of fresh air", to supplement what it was already getting on its way over 3 warm cyls.<br>
<br>
It's hard to quantify EXACTLY the difference, but after a week of flying and comparing the MVP-50 downloaded engine data from before to after, on a number of different flights, it seems to be an honest 20-25 degrees (F) cooler on average.<br>
<br>
A climb from sea level to 9,500 feet out toward the desert near San Diego, on a hot summer day (ISA +37F) can now be done and the oil temp does not go over 200F in climb (197) and cool down from there in cruise.<br>
<br>
Cyl head temps remain cool enough in the 330ish range.<br>
<br>
I don't know if this is the end-all solution...... but it's good enough to get me to OSH.&nbsp; <br>
<br>
Hope to see you there!!!<br>
<br>
Regards,<br>
<br>
Erik Larson<br>
Legacy<br>
N74FX<br>
<br>
<br>
<br>
<br>
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