Agree re MGL and have fitted them to several gliders now but I am still using Bill Simkinson KSA CHT 1DT which I have used initially in Pawnees for 35 years. It has pre set max temp (continuous light on) and rate of cooling (I set 22deg per min). In last 8 years or so I have added LEFT AND RIGHT switch and more recently a FORWARD and AFT switch so I can check all 4 cylinders.
Rear initially is hottest but as you climb the front can be the hottest. You do need a total seal so air does not leak anywhere. I add the shells of Tech Bul 44.page 11. I did start with westac dual cht analog but digital is much better. Another friend with a VW in RAAus aircraft and uses Dekota Digital in USA. I find DIGITAL DO NOT LIE and if you have a difference then you have an issue. With reasonable temps say never ever above 175deg C THE VALVES WILL NEVER NEED ADJUSTING. The suck out at bottom is so important also. Thus Ian we agree and as I said 30 years ago consider the digital instrument . Cost as a one off insurance policy on your engine. It is the cheapest insurance policy ever. Ian McPhee +61 428847642 Box 657 Byron Bay NSW 2481 Australia Ps. 1.My issues these days is running too cold and am thinking a small adjustable bleed of air between carb and heads. Thus bring up temps a bit more. I am over too rich now as people would tell me about black smoke on take off. 2.Also you can use MGL in a rotax 501/505 and monotors 2 cht and 2 EGTs On Fri, 25 Oct. 2019, 11:52 Ian Williams, <[email protected]> wrote: > Thought this may interest you all ... I have upgraded the 2 channel > Westach CHT to a fancy MGL 4 channel unit during a 5 year 500hr > inspection. > > I have really focussed on cyl hd temps with redesigned baffles and the > lower > exit. And achieved CHT's (according the the westach meter) down to 130C > during cruise. (OAT around 20C.) The oil temps are currently too low > (60C) so will be covering some of the oil cooler. I am interested in the > front cyl temps as some work a year or so ago tended to indicate the front > 2 > were running hotter than the rear 2. > > Apart from the different baffle design, I think the main success has been > sealing up leakage of air around the baffles, in particular around the prop > hub, inlet manifolds etc. , plus modifying the outlet to provide more > "suck" > Interestingly at high OAT's (ie around 25 - 30C) there was minimal increase > in the indicated CHT, but the oil temp got up to 90C (actually where I > would prefer it to be) > > Note the MGL Fuel indicator ... this unit uses the standard VDO tank sender > but includes a little fuel flow turbine type sensor. It has been a real > plus as it is deadly accurate and the fuel level indication calibrated at 5 > levels to cancel tank non linear effects . > > Best regards > Ian Williams > Dimona 3537 ZK-GCB > > --------------------------------------------------------------------- > You are subscribed to the Dimona Owners Group mailing list. > To unsubscribe, send email to: [email protected]
