Is there bennifit to changing fueling pump to 3 stage RR pjump?

[Hillside Motorcycle]

I can count on 1 hand, the amount of billet plates or fancy pumps we have installed since the T/C's came out. And those were at clients requests.
Scott

[cody]

Don, are you saying that Dan Thayer designed the 3 stage pump ?   Dan lives a few town's over from me and did the tune when I had my '06 Road King. 
Very knowledgeable guy, and interesting to. He has a couple of World War II  trucks up at his place (that start right up and pure like kittens) that he is happy to show you and talk about.

[glens]

Positive displacement pumps don't cavitate, like "Max" said.  But they don't lose their prime (like he said).  They're still pumping.  Might be air/froth, but it's still being pumped.  Just as soon as oil gets back to the inlet, it'll be pumped, too.

If there are two inlets and one of them is working with a different viscosity material and/or the inlets aren't capable of the same flow, they'll just flow proportionately.

If you're having trouble sumping, maybe you need to enlarge the oil return holes from your heads and/or from the crankcase.  Now that will be a bit of work on an otherwise well-running engine; more work than simply swapping out to a 3-cavity pump, which should "fix" it too if the new pump works well-enough.

[itsafatboy]

So how thick are the gears compared to the fueling feed gear are the 3stage gears that thick or are they thinner like the older oem feed gear or the new oem feed gear

[glens]

They wouldn't be "stages", it's just three separate pumps, two with a common outlet.  Don't have a clue about relative sizes.  Just saw it being discussed and wanted to marginally poo-poo somebody's poo-pooing of them.

[WVULTRA]

So how thick are the gears compared to the fueling feed gear are the 3stage gears that thick or are they thinner like the older oem feed gear or the new oem feed gear

Thayer's pump uses same gerotors as the late style H-D pump; extra set of scavenge gears in rear/3rd stage.

Had one laying at Axtell's booth in Cinci, and my buddy elswick had a very interesting conversation with Thayer!   

[surf]

http://www.tmanperformance.com/image-viewer.htm?oilpump_camplate/Fnewproduct1-2.jpg

[FSG]

[Admiral Akbar]

IIRC they are all late model feed rotors.. So what is the feed to scavenge ratio?

Max

[pwmorris]

Don't see the need for stock or mild builds as stock pumps work just fine-If anyoneone needs that much, why not skip the 3 stage and go to a 4 stage?

[Admiral Akbar]

Don't see the need for stock or mild builds as stock pumps work just fine-If anyoneone needs that much, why not skip the 3 stage and go to a 4 stage?

You are preaching to the choir here..    I would like to try it in the 131 but the first thing I'm doing is removing the scavenge side oil cooler.. Unfortunately it's head gasket time first..    Max

[FSG]

IIRC they are all late model feed rotors.. So what is the feed to scavenge ratio?

Max

A trick question Max ?

[Admiral Akbar]

If you understand what is going on it's a "no brainer"..    Max

[FSG]

True, 3 rotors, 1 feed, 2 scavenge, but I'm still looking for the hidden gotcha in your ?   

[Admiral Akbar]

Well express it as a ratio and you are done..    Max

[FSG]

I was done a long time ago    but was looking for your gotcha but no one would bite or perhaps no one saw it.   

http://harleytechtalk.com/htt/index.php/topic,23914.msg245325.html#msg245325

[glens]

He wants to know what the widths of the three rotors are.

[rednectum]

ratio would be 1 to 1. less than oem.

[noliners]

Im running the Fueling w/ the Latus motors spring and its works great. No oil issues. Running vent lines to the ground.

[Admiral Akbar]

ratio would be 1 to 1. less than oem.

Think about it, you have 2 scavenge rotors.. Max

[itsafatboy]

.310 gears wouldnt it be 33 feed 66 scvage ao close to that base on the specs of the oem late model pumps with the .620 scavage and the .310 feed ,  since it would be 2 * .310 scavage  and .310 feed and the oem was 33 / 66 ratio 

[Showdog75]

I've got a secret and I've just got to tell someone ! The stock[yes I said stock] oil pump works awesome.  

[jam65]

I need more scavenge and I got it.Now I will see how the Thayer works on a .630 cam with a Delkron plate.

[Hillside Motorcycle]

I've got a secret and I've just got to tell someone ! The stock[yes I said stock] oil pump works awesome.  

Sho' 'nuff does.
Scott