As winter approaches I will soon need a preheat system. Search has turned up a few threads but I would appreciate some recent thoughts on the subject.
I like the Reiff system with sump and cylinder heating but I cant say I love the price. There are lower cost alternatives but they do not offer cylinder bands. I have another obstacle to overcome. I have a carbon fiber plenum so I need to find a way to penetrate the shroud to connect the wiring harness so I have only 1 plug under the cowl. I have seen plug wire grommets for 6 cylinder engines that might work nicely by using the 3rd grommet hole for the wiring harness.
Any pics and opinions welcome.
It's good that no one else offers cylinder band heaters, since I have a patent on them.
If you install the multi-point system (oil and cylinder heaters) on a 4 cyl Lyc you can avoid the need to penetrate your plenum with the main harness by locating the AC plug in an air inlet as I did on my RV-4 (picture here, scroll down
www.reiffpreheat.com/RV4.htm ). You only need to go through the rear baffle/plenum if you want the AC plug by the dip stick. If you install the oil heat only, there is also no need to penetrate the plenum. In that case locating the AC plug in the air outlet might be a good option.
Note that our systems are modular so you have the option of installing the oil sump heater first, and if you decide later you want more heat you can add the cylinder heat system. The only price ?penalty? of buying them separately is that you would need to replace the oil heater?s AC power cord with a harness P/N HSH to allow the oil heater to plug into the cylinder heat harness. That?s a $14 part. An oil sump heater is all many people need. Ours will raise the oil temp about 80F above ambient, and the engine 35-40F (plugged in over night with a blanket over the cowl).
As far as the ?high price? of our systems? compared to what? We have only one competitor for the multi-point systems. Compared to them we have a 40% average price advantage for comparable wattage systems, 140% for replacement parts, our warranty is 5 yrs vs their 3, and there are several other advantages. For the oil sump heater systems our aluminum heating elements are far more durable than the silicone pads used by our competitors, but we sell it for about the same price, with a much better warranty. We think we offer a very good value relative to other aircraft engine heaters. However, compared to automotive heaters we are high, due to the economy of scale. They probably sell a million units a year, we sell a small fraction of that. That means all our fixed costs like liability insurance, advertising, etc are spread over fewer units, so the per unit cost is higher. Unfortunately that's the case with all aviation products.
Our systems are FAA approved for certificated aircraft, but Experimentals don?t need that. If cost is an issue you can use a non-FAA approved product such as an automotive heater, but be aware they are normally silicone pads and are not thermostat controlled.