---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 06/29/08: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:50 PM - Low Oil Pressure....Re: High Oil Pressure (Roger Lee) 2. 06:55 PM - Re: High Oil Pressure (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 06:50:26 PM PST US Subject: RotaxEngines-List: Low Oil Pressure....Re: High Oil Pressure From: "Roger Lee" Hi Tommy, Couple of things here. The VDO gages come in two models. One has an anti vibration cadmium ring around it and it cost $200+. The other exact VDO gage is the same gage it just doesn't have the anti vibration ring and it sells for about $40. Since Rotax has had some issues over the years with the vibration on the oil pressure sender I would remote mount it and use the $40 model. This is an approved modification from Rotax. If you have a Dynon system and a fuel pressure sensor for that I would highly recommend that gets remote mounted. Now for the problem of the low oil pressure. To check to see if the sender is correct you can buy at the hardware store a few simple items and make a mechanical gage and see if the sender and the gage in the cockpit are correct. Checking the sender and cockpit gage with a mechanical one is the number one item to try and see where you need to look first. Use 1/8" copper tubing, a mechanical gage that goes up to 100psi. The oil pressure sender is a 1/8" NPT fitting. Bring the tubing out about 12" then add a tee fitting. This way you can put the sender back in line and check it against the mechanical one. Put the mechanical gage at the end of the 5' of copper tubing. 5' of tubing lets you bring the gage into the cockpit to compare. A few months ago I had the same problem with an Flight Design CT and found a partial ground. The meter said it was grounded, but I found it was only a partial ground and when I added a test wire right to the ground it started to read in the cockpit as it should. Does the pressure change with the the rpm. Does it go up and down? Partial ground problem. It may change some (normal), but if it is a partial ground it gets lower in pressure as you give it more throttle. Your 912ULS oil pressure should be between 40-55psi during normal cruise rpm's. It will be a little higher on start up, but then come down as it gets warmer. Some of the older 912ULS's ran higher oil pressure than the new 912's run. Rotax lowered the pressure. They said they were more concerned with volume over pressure. Hope this helps. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=190481#190481 ________________________________ Message 2 _____________________________________ Time: 06:55:30 PM PST US Subject: RotaxEngines-List: Re: High Oil Pressure From: "Roger Lee" Hi Guys, I would not think the oil pressure is really at 99psi. You need to check this against a mechanical gage which I think will show you your pressure is normal. My first thought is the oil pressure sensor wire is too close to an energy producing wire. Move your oil pressure sender wire away from all energy producing wires. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=190483#190483 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.