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If that is really all they did I do not see it helping much if any. The current pump inlet is ~0.490" in size. The supply hole that leads down the case to the sump area is ~0.312". The pump is already restricted by that hole as well as it has to pull the oil around two corners and up hill about 2 1/2" from the sump level, up to the pump inlet. I just do not see that bushing helping any in this case.
What I was hoping for is that the inlet grooves that feed the gear rotor set would be changed and maybe they are and we just cannot see it from the pictures.
Also it's a duel scavenge single rotor pump just like a TC... Too bad.. Hopefully Dan Thayer will build a dual scavenge rotor pump.. Bet Hd didn't use one cuz Thayer holds the patent..
Someone showed the wrong side for scavenge in another thread..
Not sure about that patent, as I believe it is an application patent on a twin cam. Also Bruce I do not believe that is a dual inlet, the inlet from the sump is on the left the one on the right is a vent I believe as it exits the casting below the picture inlet with the bushing in it.
Last edited by Steve Cole; Jul 11, 2017 at 07:43 PM.
Reviewing the picture more it looks like maybe the inlet area of the gear rotor has been machined as it looks more like a finished shine on the surface than a dull finish in the as cast areas. Could be the light of the flash too.....
The pump body has the same cast ID numbers as the ones I have here on the shelf so they are working from the same Die Cast part to start with.
Last edited by Steve Cole; Jul 11, 2017 at 08:04 PM.
Not sure about that patent, as I believe it is an application patent on a twin cam. Also Bruce I do not believe that is a dual inlet, the inlet from the sump is on the left the one on the right is a vent I believe as it exits the casting below the picture inlet with the bushing in it.
I guess I need to go back and look at the patent.. Too bad it wasn't a design patent..
As far as I can tell the one on the left is for the sump and the one on the right is for the cam case..
Here is an example of a fueling TC pump.. Right blue arrow is cam case, Left blue is crankcase sump. Limey green is the return to oil tank.. This is the same as a STD TC but the feed side is in another housing in the fueling.. Remember, this is reversed since we are looking at it from other side. In this case the Gerotors spin clock wise.
Not sure about that patent, as I believe it is an application patent on a twin cam. Also Bruce I do not believe that is a dual inlet, the inlet from the sump is on the left the one on the right is a vent I believe as it exits the casting below the picture inlet with the bushing in it.
Could be but then they have reduced the cam chest inlet from a ~0.460 feed hole size down to a ~0.312" size and allowed for more oil level in the cam chest as it sits higher off the bottom. All that and increase the size of the suction gear rotor set around 40% and it still doesn't work as well as the Twin Cam smaller pump set. The suction supply from the sump section is the same size as the Twin Cam currently
Pretty tough to patent and oil scavange pump as they have been used from longer than I've been alive or Dan. Multi stage suction is very common place in aircraft and racing so I was surprised he got it in the first place.
62400178 for oil and 62400182 for water according to M1450? Is 144 just the body?
Hmmm looks like a different part # on the oil pump they shipped for my bike than the part # in the SB. I need to follow up with the shop on that one. According to the M1450 Service bulletin (below) there are 2 "current oil pump" part #s that can be used with all OE engines that do not require maintenance or repair due to "sumping":
For all M8 Stage 3 & 4 upgrades the following oil pump part #s should be used:
3) #62400178 - oil cooled Stage 3 or 4 upgrade
4) #62400182 - twin-cooled Stage 3 or 4 upgrade
If there is no damage to the stock oil pumps (listed above) when used on a stock engine, they should not be considered defective as outlined in the bulletin.
Last edited by Heatwave; Jul 12, 2017 at 03:00 PM.
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