In Nov/07 Brutus450 posed the question; On Sportsmans with the dry sump oil system why does it matter if you overfill the remote sump tank.

I have the same question because it seems not relevant if it is slightly overfull. Its not like the crankcase is overfull. Some form of pump draws oil from the sump to the engine and can only take what it needs. Seems to me that it only means you have that much more of a resevoir to draw from., pro or con

Any input, pro or con????

 

I posted it the other day too!! ANYONE have an answer?????

come one guys help me and Mongrol !!!

I have seen drag cars use larger sumps to have more fresher cooler oil.............it only comes in and goes out as fast as the pump takes it. And dont say it will over pressureize because its got an over flow line WITH a SLIT in it.

 

Who said it matters? but Why would you want to put in more $$$ oil than it needs?

 

Just by accident, slight overfill. Any aerobatic aircraft usually has a dry sump system. Manual (not Manuel) is adament not to overfill. A problem or Polaris just didn't edit the older manuals?

 

Expansion & pressure is the only issues I know of. I overfilled my Z400 once & when I turned open the filler/dipstick to check the level, it puked oil all over from the pressure.

See, a dry sump engine needs to be started & warmed up a little to check the oil level properly. If you check the stick cold, chances are it'll show low, but if you start the engine, let it idle for 5 mins., & then check the stick, it'll show full.

 

Reasonable explanation CATman. I got my quad back from 1st service today and oil level showed 1/2 way up the add portion of the dip/s. Added 4 oz, ran it and rechecked, still under. Did this a couple more times till I added a total of 16 oz, ran it 5 min, rechecked and it was just barely over the full line. Service dept swears they put 2 US qts in. Have to take it for a run tomorrow to get it really warm.

 

catman - doesnt really make sense to me that you would have it spew out if its got a pressure releif hose.

Mine sometimes reads high until I start it then warm it up, then it goes down and sometimes it reads low until warm then reads right

 

Until it was service, the oil level never changed, hot or cold.

 

im assuming the race car uses more oil for the hotter running engines to col it better. i agree w/ cat man of the pressure theory. it may not to seem to make since but i think if it has too much oil and it builds more pressure then it suppose to it take take out the seals which isnt designed to take that much extra pressure. imo.

 

My statement was just a theory. But, to me it make total sense. I run heavy equipment & the hydraulic oil levels on all machines when cold in the morning generally show 1/2 "full" or lower.

However, you don't go & fill them up to the full mark. You leave them low & when the oil is hot the sight glass now shows full. Reason??.... hyrdraulic oil is basicly a dry sump system too. The oil is stored in a seperate tank (cylinders hold oil too, I realize this) & when the system is put into use, the expansion & pressure forces oil back to the holding tank. Same principle with any dry sump system i would guess??

Also, as I said in my first post, I checked the oil in my Z400 & it showed 1/2 way on the checkers. OK, so I add a few ozs. & start the engine, let it warm up, take it for a little ride, come back shut it off & go to pull the filler/stick to see where level is now & PUKE!!!! oil goes all over Hell from the expansion & pressure.

I then did some research & found out on dry sump engines you check the oil level cold, just like any engine, BUT as long as there is some oil on the stick, even if it shows low, you start it anyhow & run it until warmed up & then recheck. If it still shows low when hot, then add oil. This goes back to what I apply everyday on heavy equipment. Guess I shoulda known better than to overfill my quad HUH?!?!?!