Topic: CB750 wet/dry sump

[dakeddie]

I was just flipping through an old issue of Classic Bike and in the letters section, some guy wrote in about his Triumph wet sumping.  He claimed that he could consistently drain 250ml of oil from his sump, which he figure should be dry almost completely dry.  To me, that doesn't sound like much oil when you consider all the oil in the top end that's going to drain down.  But the editor, to my surprise, started going over all the possible things that could be wrong with his oil pump.

Now, I don't know how much oil I regularly drain from my CB750 sump exactly, but I'm pretty sure it's more than 250ml... in fact, I think it's around 1L.  How much oil is normal to drain from a CB750 sump?

[mystic_1]

I'd bet that if you took a CB750 oil pan and poured 250ml of oil into it, it wouldn't rise anywhere high enough to cover the sump intake.

No idea about the Trumpet though, the design might be totally different than ours.  Maybe for that bike, 250ml is a lot.

mystic_1

[dakeddie]

good point.   i forgot that the pump sits up in the sump.