140mm pump

[brian lewis087]

I was woundering what the difference is between the number of veins in the pumps do,, I have seen them from 4 ,8,12,16,, and what would be the biggest pump I could use on a 1997 challenger with a 787

ty inadvance

 

[Guest_User]

I was woundering what the difference is between the number of veins in the pumps do,, I have seen them from 4 ,8,12,16,, and what would be the biggest pump I could use on a 1997 challenger with a 787

ty inadvance

Hub size also comes into play. More vanes equals more thrust/bottom end, and a bit less top end given the same HP of the engines.

now for the Challenger, leave the 140`s in there. You simply don`t have the power to spin 155`s even if you could match up/fabricate the driveline. Some one on the forum did an awesome project with 2 951`s that were worked and got very nice speeds out of ot, but that came at a huge cost...

the 140`s in the boat are pretty much the best most efficient option, choose the correct pitch impeller to get what you need. but it is always a give and take, more bottom less speed and vice versa.

there is a lot more to the explanation of larger, more vane pumps and the requirements to use them. In my past experience more torque/HP was needed to realize any true gains using an aftermarket or modified OEM pump, not to mention the time and several different pitch impellers to find what works best... on that note the Challengers are designed pretty much spot on in that department, heavy boat needs bottom end thrust without any cavitation to get up on plane and maintain a decent top end speed. The tweeks with impellers have minimal gains and can swing between -3 - +3 mph experimenting with impeller pitch... The aftermarket impellers are far more effcient so you`d be better off choosing a pitch that suits your needs and calling it a day...

 

[MEDOO]

What would be the exact replacement pump for my 98 Challenger twin 787's? I want to buy a used spare to rebuild and learn on, but I don't want to get the wrong one.

 

[Guest_User]

What would be the exact replacement pump for my 98 Challenger twin 787's? I want to buy a used spare to rebuild and learn on, but I don't want to get the wrong one.

Impeller Housing Ass'y Includes 8 - 9.
204160051


http://www.sea-doopart.com/oemparts/a/sea/500cf89df870021b3c6a7f13/propulsion-system

MEDOO, be very careful buying used, buy from a trusted source. The brass inserts for the exit venturi mounting get pulled into the housing when they have been tightened beyond the correct torque repeatedly. You don`t want a warped housing either...

I suggest a new replacement housing from a good source, bearings and parts, remember to get cone O rings, and neoprene pump seals to have on hand...

or you could find/post in the classifieds for a good use complete assembly, service it with a new wear ring and pump oil and toss it on the shelf...

 

[brian lewis087]

awesome help thank you

 

[MEDOO]

Impeller Housing Ass'y Includes 8 - 9.
204160051


http://www.sea-doopart.com/oemparts/a/sea/500cf89df870021b3c6a7f13/propulsion-system

MEDOO, be very careful buying used, buy from a trusted source. The brass inserts for the exit venturi mounting get pulled into the housing when they have been tightened beyond the correct torque repeatedly. You don`t want a warped housing either...

I suggest a new replacement housing from a good source, bearings and parts, remember to get cone O rings, and neoprene pump seals to have on hand...

or you could find/post in the classifieds for a good use complete assembly, service it with a new wear ring and pump oil and toss it on the shelf...

I did this and found several folks with used ones to sell. Just nervous I will get the wrong one.

brian lewis087, thanks for letting me step in here for a bit...

 

[Guest_User]

I did this and found several folks with used ones to sell. Just nervous I will get the wrong one.

brian lewis087, thanks for letting me step in here for a bit...

easy peasy, just verify the part number and look it over well... remember it`s plastic and a 10-15 year old pump will not look new. even if the used pump had been serviced multiple times in it`s life cycle, which is a good thing, people tend to over tighten the hardware and crush the cone and ears on the pump, that`s how the brass inserts pull thru...
I had to chuck both of mine in the trash bc of the PO doing just that...and one housing ws replaced and new and still damaged...

you may get lucky and find a good candidate, but also consider the price your paying used verses the cost of a fresh new housing and parts... they way I look at it, this is the means in which your boat is being propelled, even for a spare to close out the season, you don`t want the pump coming apart and possibly damaging the tunnel or hull of the boat...

B -break
O - out
A - another
T - thousand

yup we all learn that lesson...:facepalm::cheers:

 

[racerxxx]

Just pay attention to the hub size(the center of the pump). 98 and down SHOULD have the small hub pumps, 99+ SHOULD have the large hub pumps on the boats. If you bought a pump from Minnetonka4me you're not getting a POS. I'm sure other guys on here are not out to screw anyone.

Small hub pump--look at the diameter of the cone
Later small hubs were plastic




Large hub pump-- Compare the cone diameters you can also see how short the veins are

 

[brian lewis087]

awesome info thank guys

medoo please feel free to but in any time on any topic

love this place

 

[Guest_User]

racerxxx bailed me out a few times, he knows his seapoo`s!:facepalm::lols:

 

[MEDOO]

Just pay attention to the hub size(the center of the pump). 98 and down SHOULD have the small hub pumps, 99+ SHOULD have the large hub pumps on the boats. If you bought a pump from Minnetonka4me you're not getting a POS. I'm sure other guys on here are not out to screw anyone.

Small hub pump--look at the diameter of the cone
Later small hubs were plastic




Large hub pump-- Compare the cone diameters you can also see how short the veins are

Interesting. Someone on here tried to sell me a large hub pump for my '98 boat, said not to get a small hub pump, said it would bolt on, but not work well. Glad I doing some homework first...
I've owned i/o boats for 30+/- years. I can rebuild a merc motor, Alpha One and Bravo One outdrives. But I feel like I'm starting over with my first jet drive...:banghead: Well I guess I am...

 

[racerxxx]

If your boat is a twin you really should have it matched, at least I would. If it's a single a large hub will work, just make sure you have the impeller to go with it.

EDIT:You really need to verify what you have NOW, then go from there.

Sent from my SGH-T889 using Tapatalk 2

 

[MEDOO]

If your boat is a twin you really should have it matched, at least I would. If it's a single a large hub will work, just make sure you have the impeller to go with it.

EDIT:You really need to verify what you have NOW, then go from there.

Sent from my SGH-T889 using Tapatalk 2

Yep, thats the plan.