greenmeeny

Is it worth sticking the bigger 05-06 sump (with pick-up) on an 03-04 and shimming the pump? Less windage and a few more horses or oil starvation and associated joys?
The bike's engine has a few mods, all little things add up is my reasoning for this one……...and it's cheap...if it works.

markketo

Hmm. At least 05/06 has an cylinder head oil restrictor (in the head gasket) so it keeps more oil in the sump (and helps out with the smaller flow of the pump). 03/04 doesn't have one.

So there is a possibility of oil starvation but I don't know enough of engines to say what the chances are.

__________________
Klicky! Project: basicly nothing to do. 2003 ZX-6R with mods... still missing a paint job.

greenmeeny

I thought the gaskets were interchangeable, the kit ones are, I was told.
The 05-06 oil pump has a bigger impeller, but, is slower geared.

markketo

Kawi said they reduced losses by regearing and modifying the oil pump. Less losses = less powerful oil pump = less pump displacement per rotation = less pressure.

I have to check the numbers but 05/06 has a lot lower oil pressure than 03/04 at 4000rpm. Of course after 7000rpm it's probably neglible. I have no idea what the contribution of the restrictor is but I'd guess that a 05/06 without it will have quite low oil pressure on idle.

Check the attachment for what I mean. I can't double check on the 03/04 gasket as I don't have it anymore but it's definately there with the newer gasket.

Attached Thumbnails

 

__________________
Klicky! Project: basicly nothing to do. 2003 ZX-6R with mods... still missing a paint job.

greenmeeny

Cheers man. Do you know if the kit gaskets are the same (the restrictor I mean)?
Or, if it would be worth drilling out the restrictor, if there is one, on a .45mm kit head gasket (05-06 RR) for my 05-06 RR headed 03 636?

Paging White Hendrix…....White Hendrix to the forum, please.

markketo

I have absolutely no idea. I don't see any harm in running the restrictor though (except for a slightly hotter head?) as it just directs more flow to big end bearings and back to sump.

__________________
Klicky! Project: basicly nothing to do. 2003 ZX-6R with mods... still missing a paint job.

Sev

If you can make the sump bigger without changing the pump I would. More oil means it can soak more heat and that means your cooling system doesn't work as hard and your oil will last a little longer.

It was common on the first gen 675's to shim the oil pan down 1/4" so you could run more oil when racing.

__________________
Of course I'm generalizing from a single example here, but everyone does that. At least I do.