---------------------------------------------------------- Stratus-List Digest Archive --- Total Messages Posted Mon 08/29/05: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:53 AM - A cooling variable (Larry McFarland) ________________________________ Message 1 _____________________________________ Time: 09:53:55 AM PST US From: Larry McFarland Subject: Stratus-List: A cooling variable --> Stratus-List message posted by: Larry McFarland Hi guys, The stratus list has been quiet for some time and I thought this might be of interest to some of you. I went to the airport to set lifters and I discovered the ram air scat tube had not been reattached when the cowl was last attached to the mid-pipe that joins the heat muffler. That's why the coolant had reached 207-degrees F in flight yesterday. On 80-degree days, the coolant never gets above 195 and I didn't realize the significance of that til today. The hot muffler is normally washed by cool ram air from near the prop going thru the heat muff. Excess heat is normally dumped over the side away from the radiator intake or in winter into the cabin. With the heat muff disconnected, heat poured right into the radiator intake and the coolant temperature rose by at least 10-degrees to 207. If the scat tube had been connected, coolant temps would have been 195-197 degrees. The .014-gap was good on all but two valves that had to be re-adjusted for being just one one-thousanth too tight by feeler gage. Cowling halves were re-attached with scat tube connections in place. This error on my part provided some useful information on the cooling effects of having versus not having a heat muffler in place ahead of the Rabbit type radiator. Have a good one, Larry McFarland - 601HDS Stratus Subaru at www.macsmachine.com