Keep in mind regarding oil levels in VW derivative engines that the dipstick is designed to be accurate when the motor is level. When the tail is sitting on the ground 1/2 on the dipstick is will equate to full with the tail up and engine level Rob
.............................................. ----- Original Message ---- From: Laurie Hoffman <[EMAIL PROTECTED]> To: [email protected] Sent: Wednesday, 20 February, 2008 7:10:03 PM Subject: Re: [DOG mailing list] Fwd: Never overfill oil or it could run 15deg HOTTER!!! Hi All, Thnx Nige for getting the Dimona Users Group up and chatting again. Its a shame not to share experiences between fellow operators. While operating a Super Cub as a glider tug for many years we learned to keep the oil level lower as it had a significant impact on keeping the oil temps at an acceptable level. Our Dimona has a spin on oil filter (camry) approved mod developed by Nigel and Rob I believe. I think its due to the dramatically increased surface area of braided hose lines and filter surface area and that we dont fill above halffull on level ground, that we suffer from oil temps more often being low. Winter requires partial covering of the oil cooler. On the matter of fluid levels varying with attitude, I've found a significant variation in dip stick accuracy depending on how the aircraft sits. Tail high = overread, tail low - underread. On our 60lt tank this can make a difference if you arent mindful. Anyone else have the same? Possibly the 80lt tanks arent as affected. Laurie --- Nigel Baker <[EMAIL PROTECTED]> wrote: > Hi All. > Yes Ian, the same applies to the L2000. > Besides higher temps you also lose a little > horsepower. Thrashing the excess oil around with the > big ends causes friction. That generates heat. Heat > is energy and that comes from the engine so less > power to the prop. > In the Dimona the mid way point between the 2 lines > is the top position for the oil. > If you put the correct amount of oil in as per the > Limbach Manual when yo do an oil change and check > the dipstick afterwoods tis will show the correct > spot on the dipstick. > If you lift the tail till into cruise attitude > (engine level) you will then find the oil sits at > the top line on the dipstick.. > Thus many pilots tend to want to overfill the thing > thinking it should be filled to the top line. > Hope that made sense. > Cheers. > Nige. > > ----- Original Message ----- > From: Ian Mc Phee > To: DOG LIST > Sent: Tuesday, February 19, 2008 11:11 PM > Subject: [DOG mailing list] Fwd: Never overfill > oil or it could run 15deg HOTTER!!! > > > > > I got a phone call today from Chris Kiehn RAAus > and he alerted me to to service bul and Jabby chat > end of January and among other things I thought it > interesting if you keep oil near bottom mark oil > temp can run 15deg C lower than running at just > above full mark. Newer Jabirus have a deeper sump > which do not have the same problem. I gather if oil > is near full mark oil gets churned up by > crankshaft/pushrods and thus engine runs much > hotter. Who would have thought it!! I was told > similar applies to VW transporter engine but not > sure about L2000. Anybody know? Ian M > > The paste is below > > Engine oil level has a strong effect on oil > temperatures. For all engines, the lowest oil > temperatures are achieved when the oil level is > set on the lower dipstick mark. Generally, > this oil level is suitable for circuits or flights > up to 3 hours duration. Note that testing has > shown that setting the oil level slightly above > the upper dipstick mark (i.e. slightly "over-full") > can result in oil temperatures 15°C higher than > when set at the lower mark. Figure 5 shows > the length of the Jabiru 3300 dipstick. > > CAUTION > This applies to all Jabiru 3300 engines and to > Jabiru 2200 engines prior to S/No. 22A- > 2440. HOWEVER, more recent Jabiru 2200 engines > (S/No. 2440 onwards) have a > different sump (easily identified by it's lack of > fins). Setting the oil level on the lower > mark in these engines will give oil levels lower > than is optimal. > Laurie 02 46531233 0425 703226 ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping --------------------------------------------------------------------- You are subscribed to the Dimona Owners Group mailing list. To unsubscribe, send email to: [EMAIL PROTECTED] Get the name you always wanted with the new y7mail email address. www.yahoo7.com.au/y7mail
