---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Wed 08/13/03: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:38 PM - Re: Dual radiators... (Grant Corriveau) 2. 02:13 PM - Re: Dual radiators... (Ed Anderson) ________________________________ Message 1 _____________________________________ Time: 12:38:51 PM PST US Subject: Re: Engines-List: Dual radiators... From: Grant Corriveau --> Engines-List message posted by: Grant Corriveau Good point... I've read that others use insulated wrapping on the exhaust stacks to reduce this source of heat... any experience with this? Is the effectiveness worth the cost/effort? Thanks again -- Grant Corriveau C-GHTF / HDS / CAM100 > From: "Tracy Crook" > Reply-To: engines-list@matronics.com > Date: Tue, 12 Aug 2003 16:59:06 -0400 > To: > Subject: Re: Engines-List: Dual radiators... > > The main source of under cowl heat problems is often heat from the exhaust > system, as you mentioned. The air from the rads is often the only thing > holding temps down under the cowl. If you are successful in sealing the > cowl for better aerodynamics, my guess is that the problem will get worse > instead of better. But that's just my guess. Let us know how it goes. > > Tracy Crook ________________________________ Message 2 _____________________________________ Time: 02:13:03 PM PST US From: "Ed Anderson" Subject: Re: Engines-List: Dual radiators... --> Engines-List message posted by: "Ed Anderson" @ca.inter.net> > > Good point... I've read that others use insulated wrapping on the exhaust > stacks to reduce this source of heat... any experience with this? Is the > effectiveness worth the cost/effort? > > Thanks again > Most recommendations are not to use such wrappings. A Velocity recently went down (no injuries to pilot) due to his exhaust headers cracking and spraying hot exhaust gas on portions of fuel system causing vapor lock. The builder had wrapped his exhaust with fiberglass header tape and was not able to spot the crack before it got to the critical point. Generally, while the wrapping can be effective in reducing undercowl temps, they can also cause rapid deterioration of the exhaust headers and make it difficult to catch such conditions as they are hidden by the tape. If you went this route, it might be better to check into high temperature ceramic coatings which are reportedly very effective and still permit inspection of the pipes conditions. Best Regards Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC