Oil feed pump Rotor and cam dogs interference

Rotor vane grooves are smaller than cam drive dogs

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Holtvintage
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Re: Oil feed pump Rotor and cam dogs interference

#31

Post by Holtvintage »

20200402_195558.jpg
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20200402_195607.jpg
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Frankenstein,
Here are some photos of the chamfered edges. Yes,it is typical of all 4 grooves on my rotor.



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Re: Oil feed pump Rotor and cam dogs interference

#32

Post by Holtvintage »

Frankenstein wrote:
Thu Apr 02, 2020 12:41 am
As Ktabel noted, I've never seen a worn rotor slot either. You might just try a file to the rotor in a non sensitive area to test hardness. Just for curiosity's sake.
Mark, I think your build will probably do just fine. I am totally amazed by the difference in combustion burn that the ULR heads made. The traditional hot spot where my Pistons always died, just isn't there with those heads. Good luck.
DD
In regards to the hardness test, I tested it with a cheap drill bit for 1 second with medium pressure and this was the result. As far as the galled up material that was forced into the groove openings, 1 back and forth motion cleaned up any burrs. My opinion is that it is slightly hardened but is still lacking.
20200402_195530_resized.jpg
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Re: Oil feed pump Rotor and cam dogs interference

#33

Post by Frankenstein »

Doesn't appear to be very hard, doe it... Factory rotor I use carbide tooling to machine, typical HD protocol, fairly deep case hardening, then just good steel beneath. Thanks for checking. I guess clean up the damage and monitor the wear situation after you get more miles on it. I think the only issue might be the cam dogs creating a notch.
DD

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Re: Oil feed pump Rotor and cam dogs interference

#34

Post by RooDog »

For the general reader:
My protocol, doctrine, SOP, whatever, is when modifying, attempting to mate two mismatched components, or improperly meeting parts, the one to modify is the cheaper and easiest to replace of the two. In this case the rotor is the easiest to access, but is it easily sourced, and cheaper than the currently available Andrews cam? Antique parts are often rare and expensive. I am not familiar with the SV market, but these are my thoughts when considering which of the two part to alter to make fit correctly. An example would be trying to fit a junk yard Japanese fork on an old Harley frame, for what ever reason, I would modify the fork and leave the frame untouched. Again, just an example......
....RooDog....

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Re: Oil feed pump Rotor and cam dogs interference

#35

Post by RUBONE »

The face of the rotor clearance to the case and the fit of the vanes to the rotor determine the amount of oil it can push. Any modification to the rotor slots will give oil an escape route and diminish the amount of volume and pressure. (one reason the thin gasket is needed). I wouldn't even think of modifying the rotor.

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