Oil capacity question?

[Loctite77]

I know this has been beat to death but the search feature doesn't seem to be working.

I just replaced by stock oil tank on my CB750f1 with this one from Cognito Moto. I drained the oil from the engine, (I did not pull the filter) and the oil from the original lines and the tank.

Bolted up the new tank (advertised as capacity at 3.25 qts.). Filled it up to the bung, about 3 qt.s. Ran the engine for about a minute and then looked in the tank again and about 30% of the oil had been sucked into the engine. I had purchased a gallon (4 qts.) of Rotella oil so I poured the rest in the tank.

Now I am questioning if that was a good decision. Is it going to hurt to have over the stated capacity? From what I understand from reading about the dry sump system the engine uses what it needs and the rest hangs out in the tank and cools. If that is true it would help to have all the oil you can so it will stay cooler??? Or should I drain a qt off so its back a 3 qts.?

Yeah Son!

 

[coyote13]

For one thing, I would have recommended you pull and replace the filter along with fresh oil. Besides the obvious point that a fresh filter is good for business, you would also be able to measure the necessary amount of oil specified in the manual. Is this tank the same size as stock or no? If not you might need to do some math to figure out how full that tank needs to be

 

[Loctite77]

I got that as its all common sense stuff. I'm really after an answer to the theoretical question of is more that OE amount of oil okay or even "better" if I'm able to run that much? And does anyone know the total oil capacity of a CB750f1, combined what the engine holds and the 3.5 qts the stock tank holds?


Yeah Son!

 

[hillsy]

A dry sump motor can have any size tank you want - they pull the oil out as it is needed and displace it back in the tank.


The motor doesn't know or care how much oil is in there - just that there IS oil in there.

 

[hillsy]

I mean within reason - you wouldn't want to run a really small tank or else the oil will get too hot / go off real quick.


But larger than stock? Fine...