---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Fri 03/12/10: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:22 PM - Rotax 914 CHT under spark plug probe (pestar) 2. 01:55 PM - Re: Flywheel puller (Geico266) 3. 04:00 PM - Re: Rotax 914 CHT under spark plug probe (FLYaDIVE) ________________________________ Message 1 _____________________________________ Time: 12:22:48 PM PST US Subject: RotaxEngines-List: Rotax 914 CHT under spark plug probe From: "pestar" I have a 914 for which I am using MGL EFIS's. As part of this I purchased the MGL under the spark plug 4 x CHT probes. http://www.mglavionics.co.za/ In trying to fit them I find there is no room because of the copper tab with the attached K type wire prevents the ring aligning itself with the spark plug hole. Even if I were to get this alignment I then cannot get a plug spanner over the spark plug to tighten it because this tab is in the way. Has anyone fitted under spark plugs CHT probes to a Rotax 91X series, if so what type and how did you go about it. Would appreciate any ideas as I would like to be able to monitor all CHT's rather than using the standard 2 built into the engine. Thanks in advance. Peter Peter Armstrong Auckland, New Zealand Read this topic online here: http://forums.matronics.com/viewtopic.php?p=290140#290140 ________________________________ Message 2 _____________________________________ Time: 01:55:27 PM PST US Subject: RotaxEngines-List: Re: Flywheel puller From: "Geico266" Do you still need a puller? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=290147#290147 ________________________________ Message 3 _____________________________________ Time: 04:00:23 PM PST US Subject: Re: RotaxEngines-List: Rotax 914 CHT under spark plug probe From: FLYaDIVE Hello Peter: I wish I had know you were considering under the spark plug thermocouples, I would have tried to talk you out of them. If you have the option for any other (in head) type of thermocouple PLEASE do so. The under the spark plug type tend to read VERY high and do not respond well or quickly to temperature changes. The reason why is most of the heat being sensed if from the spark plug and not the heat of the cylinder, it is the heat generated by the spark. There have been reported problems with NOISE and ERRONEOUS readings because the probe is located in contact with the spark plug. Also the probe is of the GROUNDED nature which carries more noise than un-grounded probes... This may be a problem when routing the cables. Does the engine have in-head locations for thermocouples? BUT! If you are forced to use them, and as you say are having problems with fit... You must remove the crush washer that comes attached to spark plugs. And if you are using the large copper washer... do not use it ... Use JUST the thermocouple. Barry On Fri, Mar 12, 2010 at 3:21 PM, pestar wrote: > > I have a 914 for which I am using MGL EFIS's. As part of this I > purchased the MGL under the spark plug 4 x CHT probes. http://www.mglavionics.co.za/ > > In trying to fit them I find there is no room because of the copper tab > with the attached K type wire prevents the ring aligning itself with the > spark plug hole. Even if I were to get this alignment I then cannot get a > plug spanner over the spark plug to tighten it because this tab is in the way. > > Has anyone fitted under spark plugs CHT probes to a Rotax 91X series, if > so what type and how did you go about it. > > Would appreciate any ideas as I would like to be able to monitor all CHT's > rather than using the standard 2 built into the engine. > > Thanks in advance. > > Peter > > Peter Armstrong > Auckland, New Zealand > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=290140#290140 > > ------------------------------------------------------------------------------------- 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.