Author Topic: Billet CNC Oil Pump Rotors (Now in stock!) - CB500/CB550 anyone? (Read 14490 times)

Medyo Bastos · « **Reply #25 on:** August 23, 2018, 03:57:34 PM »

Got mine, ‘preciate it

Sent from my iPhone using Tapatalk

PeWe · « **Reply #26 on:** August 23, 2018, 10:04:52 PM »

I have a strong feeling that I soon will restore an old pump. Gasket kit needed too.

PeWe · « **Reply #27 on:** August 30, 2018, 09:38:06 AM »

Rotors arrived today! Thanks!

Waiting for Vital seal kit. An old pump will be restored this winter.

kmb69 · « **Reply #28 on:** September 05, 2018, 08:02:58 AM »

Received mine. Thx
Looking real good Mirko!

MessnerMoto · « **Reply #29 on:** September 05, 2018, 10:55:39 AM »

Thanks guys!

jus4selling · « **Reply #30 on:** September 17, 2018, 10:51:31 PM »

These look slick!

PeWe · « **Reply #31 on:** March 13, 2019, 12:48:11 PM »

I finally installed the rotors in a pump that has got the Vital seal kit.
The rotors have a fantastic tight fit without any metal contact when rotating the sprocket as old Honda due to scuff marks that also sat looser in the pump body.

I have one more pump that will get a set of these nice rotors. Both my bikes will get a pump swap, upgrade of pressure when oil is hot.

PeWe · « **Reply #32 on:** March 25, 2019, 09:20:15 AM »

Another set arrived today
Thanks Mirko for improving the CB750 !!

Here the new set beside my first installed in a pump that will enter my K6 at next oil change. I'll test the pump sitting in now.
Both pumps have the Vital motor parts seal kit installed.
// Per

MessnerMoto · « **Reply #33 on:** March 25, 2019, 02:38:53 PM »

Keep them oiled Per

that 4732 hard steel is very prone to surface rusting when exposed to elements. Not important from functional point but I like them to shine

PeWe · « **Reply #34 on:** March 26, 2019, 04:38:04 AM »

I have them stored in the oily bag they came in. My garage is otherwise dry and the warmest room of the house.

PeWe · « **Reply #35 on:** May 14, 2019, 09:59:43 AM »

Update:
My blue modified K6 got new rotors. Road test, warm oil and low idle worked fine.
No flickering oil warning as before at 1000-1200 rpm when oil temp is 100-120*C.

Last ignition setting took looong time cooking the oil at idle.... Easier with 4 arms..

These rotors a cheap ensurance for a good engine.

turboguzzi · « **Reply #36 on:** May 14, 2019, 01:07:01 PM »

hei mirko

seen that you didnt say if the 500 dimensions are the same as 750...
Appears the CB500/550 rotors are 40.54mm OD, 27mm Wide, 11mm shaft, and 3.4mm offset.
how does it sound?
dont know how kmb measured, but if difference is in the 0.1mm range, id say its the same section rotor

kmb69 · « **Reply #37 on:** May 14, 2019, 03:59:59 PM »

Quote from: turboguzzi on May 14, 2019, 01:07:01 PM

hei mirko

seen that you didnt say if the 500 dimensions are the same as 750...
Appears the CB500/550 rotors are 40.54mm OD, 27mm Wide, 11mm shaft, and 3.4mm offset.
how does it sound?
dont know how kmb measured, but if difference is in the 0.1mm range, id say its the same section rotor

The 750 rotors are 18mm and 12mm wide.

turboguzzi · « **Reply #38 on:** May 15, 2019, 11:32:11 AM »

tnxs kmb
would be less concerned about width, as you can slice the section at different points.

if the section of the pump rotors is the same, then he doesnt need to develop new cad

kmb69 · « **Reply #39 on:** May 15, 2019, 08:52:58 PM »

Quote from: turboguzzi on May 15, 2019, 11:32:11 AM

tnxs kmb
would be less concerned about width, as you can slice the section at different points.

if the section of the pump rotors is the same, then he doesnt need to develop new cad

Pretty sure the rotor profiles are the same other than the width.
Mirko could easily make the 500/550 rotors if so inclined.

turboguzzi · « **Reply #40 on:** May 15, 2019, 11:46:05 PM »

find it interesting that the width of the supply side of the 750 is so much smaller than the 500...
honda learned a lesson from the 750 and applied it to the 500? or do the 750 rotors spin much faster?

flatlander · « **Reply #41 on:** May 16, 2019, 09:11:50 AM »

i don't know the answer to that.
but posting here to see if or when he makes these rotors for the 550.

MessnerMoto · « **Reply #42 on:** May 17, 2019, 01:08:43 AM »

Yoss I am back to Milano on 20th. We can test try 18mm rotors in your oil pump casing just to see if profiles are the same.

kmb69 · « **Reply #43 on:** May 17, 2019, 10:11:13 AM »

Quote from: turboguzzi on May 15, 2019, 11:46:05 PM

find it interesting that the width of the supply side of the 750 is so much smaller than the 500...
honda learned a lesson from the 750 and applied it to the 500? or do the 750 rotors spin much faster?

The 750 is a dry sump system with a pressure rotor and a sump rotor.
The 500/550/650 is a wet sump system with a single rotor set pulling and pushing.
The 750 rotors are 30mm combined.

turboguzzi · « **Reply #44 on:** May 18, 2019, 02:26:34 AM »

hei kmb, i am of course aware of that, still, if you look only at the "pressure side" feeding bearings, etc, it's notable how much wider the 500 rotor is. IMHO, the fact that the pressure side in the 750 is fed from the oil tank and in the 500 it sucks from the sump, would make very little difference to the volume per pump revolution. Just a side conversation/food for thought.

Rod · « **Reply #45 on:** May 18, 2019, 09:12:15 AM »

Quote from: turboguzzi on May 18, 2019, 02:26:34 AM

hei kmb, i am of course aware of that, still, if you look only at the "pressure side" feeding bearings, etc, it's notable how much wider the 500 rotor is. IMHO, the fact that the pressure side in the 750 is fed from the oil tank and in the 500 it sucks from the sump, would make very little difference to the volume per pump revolution. Just a side conversation/food for thought.

+1 TG - increased pressure on the feed side will have absolutely 0 effect on the mass pumped as we are looking at fluids not gases (the density of fluids can be increased very marginally e.g. deep ocean depths, but extremely high pressures are required).

turboguzzi · « **Reply #46 on:** June 04, 2019, 02:44:24 PM »

Mirko visited me today and after a quick check it's official: 500/550 rotors have the same section as the 750's. BTW, width of the 500 rotor is 22mm not 27....
Pretty sure he will reveal more details soon.

MessnerMoto · « **Reply #47 on:** June 05, 2019, 06:02:02 AM »

Yes like Yoss said we tested my CNCed(18mm of thickness) rotors and they fit perfectly. Picture provided

It is good that we tested because we discovered that rotors in cb550 are 22mm thick

MessnerMoto · « **Reply #48 on:** June 09, 2019, 02:59:17 AM »

Is there people interested in CB500/550 CNC rotors?

and is cb650 oil pump the same?

turboguzzi · « **Reply #49 on:** June 09, 2019, 02:57:38 PM »

650 rotor should be wider, not sure by how much... brent?

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Author Topic: Billet CNC Oil Pump Rotors (Now in stock!) - CB500/CB550 anyone? (Read 14490 times)