That’s where I was, with about 3 hours per quart at best.Well it is at 1850 hours. Was hoping it would go a bunch longer. No metal being made.
Have you tried hotter plugs on the bottom?...
This engine is old and three of 4 cylinders the lower plugs are usually pretty oily when pulling them for cleaning. Somehow it runs good and hasn't changed much over the 20 years we have flown it.
Each of my GO435 engines on my Twin Bonanza go through about .3 to .5 quarts per hour. That's well under the engine manual's max consumption, which is 1.4qts per hour (per engine) at normal cruise power and 1.2qts per hour at economy cruise.
The ring wash is an interesting procedure. Might try that this winter, as my engines are pretty old overhauls.
Because I fly regularly, my engine rarely sits idle for more than a week.Why 6 months when the mfgrs say 4 months?
It means the blow-by is reduced. Blow-by is the primary source of contamination in our oil. XC reducing blow-by is easy to see. Watch how the drips from the breather line are reduced with XC. I've convinced a lot of guys to try that test and all have reported improvement. They all use XC now, too.
Juicing oil with CamGuard:
1.6 ounce/quart is 47.4ml Camguard per quart of oil.
Each 16 oz bottle of CamGuard will treat 10 quarts of oil.
When I get a new case of Phillips X/C 20W50 oil, I pretreat each quart with CamGuard. Open the quart bottle and use a needleless 50 ml syringe to squirt CamGuard into the bottle neck, reseal, and mark each treated bottle with a black felt-pen 'C'. That way I never need to think about it and the few quarts of oil I carry in the plane are ready to drink. And it's not rocket science, 45-50ml is fine.
Camguard: I've posted this elsewhere, but perhaps some will find it useful.
Depends on how much oil I keep in the crankcase, more so in my 500 hour TTSN IO-360 than my old 1,200 hour TSIO-360. For local and regional flights, the sweet spot for fill in my IO-360 is 4.5 quarts. More than that ends up on the belly in an hour. With a 4.5 quart fill, I estimate my burn to be 1Qt/25 hours. I say, "estimate" because I check and maintain 4.5 quarts with each flight.What haven't we discussed by now? Curious what everyone's average oil burn is like. 10hrs/qt? Less, more? I notice as the oil ages and breaks down, the engine uses more of it, when compared to a fresh oil change, which seems to go 10+ hours before ever needing to add any.
That (4.5 quarts) sounds low, though it's above the absolute minimum from the engine manual (which seems to be 2-4 quarts depending on the engine variant and installation). But since the amount of oil in the sump affects operating oil temperatures, I try to fill as high as possible before causing excessive blow-off. Does the IO-360 have the same sump size, shape, capacity as the O-360?Depends on how much oil I keep in the crankcase, more so in my 500 hour TTSN IO-360 than my old 1,200 hour TSIO-360. For local and regional flights, the sweet spot for fill in my IO-360 is 4.5 quarts. More than that ends up on the belly in an hour. With a 4.5 quart fill, I estimate my burn to be 1Qt/25 hours. I say, "estimate" because I check and maintain 4.5 quarts with each flight.
I have a similar situation with my IO-360 in my 64 Mooney. It throws oil out if over 6 qts, and it does it very quickly. I fill to about 5.75 qts and add 1/2 qt at about 5.25. I am getting about 8 hrs/qt. My AI now fills to 6 qts during annual and I drain oil for new every 25 hrs. I also use camguard.O-320-D3G in Warrior II, about 12 hrs/qt. After oil change, I had 6 quarts and let the level settle. It usually settles at 6.5 quarts. At 5.5 quarts I add a quart. At 7 and above it blows oil out the breather tube.
The Lycoming O-360-A4M in my C-172 burns about 1 quart every 15-18 hours. At high power 2600 RPM cruise it burns a bit more oil than putting around at 2200 RPM. Same oil consumption rate since break-in was complete and it now has about 600 hours. I change oil at 50 hours or 6 months, whichever comes first (usually 50 hours). The rate of oil consumption is the same when fresh as it is approaching 50 hours. I fill to 7 qts and add a quart when it drops to 6, because anything over 7 qts blows out the breather and makes a mess. UOA shows oil at 50 hours is still serviceable, viscosity in range yet contaminants are increasing.
If a typical Lyco or Conti aircraft engine isn't burning at least a quart of oil every 20 hours, there might be a problem.
For those who see increasing oil consumption with hours, check the shape of the oil pan - if the sides taper toward the bottom then your oil consumption isn't actually increasing, but you're seeing reduced volume of oil as you get lower down on the dipstick.
I never checked that because I don't operate it below 6 qts (though Lycoming says you can). As the amount of residual oil in the sump decreases, overall oil temperatures go up slightly. When it takes 15+ hours to go from 7 to 6, it's not burning or losing much oil I and see no reason to letting it go below 6.Mine drops from 7 to 6 pretty fast, 6-5 takes a lot longer. Have you watched closer to see if maybe 5-6 indicated is a happy place?
Wow indeed. I thought these engines were "designed" to burn some oil. Put differently, the clearances in valve guides, piston rings, etc. when set properly pass a tiny bit of oil to ensure reliable lubrication over their entire operating temperature range. And at high power, some crankcase oil mist going out the breather. Net result is a healthy engine should burn a quart every 10-20 hours.Both IO-470 run happy at 10 qt / side, XC20-50 w/ CamGuard. I’ve put 400 hours on this airframe, with 400 hours on #1 engine, and 600 hours on #2 engine. I don’t burn a drop in 25 hour oil change intervals, ruling LoP. 99% cross country flying - a trainer this is not. I always thought I was supposed to burn oil. Must be an anomaly.
Wow indeed. I thought these engines were "designed" to burn some oil. Put differently, the clearances in valve guides, piston rings, etc. when set properly pass a tiny bit of oil to ensure reliable lubrication over their entire operating temperature range. And at high power, some crankcase oil mist going out the breather. Net result is a healthy engine should burn a quart every 10-20 hours.