Challenger Impeller and Trim Tabs needed. Suggestions? What the heck is this?? (Pic)

[SLOWBRAH]

After returning home from a work trip we headed straight for the water with our new toy. To my surprise, my new purchase, struggled to jump up on plane with 4 adults on board due to “cavitation”. Once I was able to plane out, a severe “porpousing” action began. It levels out with weight in the front. I am very disappointed. I finally bit the bullet to get a nice water toy and it is not performing its basic function. When I test drove the boat, I noticed a bit of cavition and knew from researching on here that it should be a wear ring. However, the ring looks good minus a few scratches. The impeller does have a few dings on the leading edge, but nothing major. My carbon seal seems to be tight (Only 40hrs on the boat), So… my steps to fix the two major issues are as follows:

1.) Install new wear ring, white. (Got one from bay area power sports)
2.) Order New Impeller
3.) Order Trim Tabs

** So… What impeller do you all suggest? I’d like to have a bit more top end than bottom WITH OUT CAVITATION. (Link with options?) School me on the "14/19" pitch numbers. What does this mean? I'm used to non jet drive. "21" pitch meaning @ 1 rotation with no slip the prop would push forward 21".

** What trim tabs do you all suggest… (Link?) These should have been installed from factory IMO.



21

Also... what are those two items? The closest one has a "one way" ball plug.

 

[xintersecty]

The Ball Valve is called the Scupper Valve. I have no idea what is the purpose. In fact the maintenance manual is not very clear. Does the excess water on the exhaust cool exit through this valve?

The other is the exhaust port.

 

[Sportster-2001-951C-Stock]

I generally think of a scupper as having something to do with a deck drain, the scupper keeps seawater from moving onto the deck by check valve action and any water on deck should pool in a low spot then go down the scupper drain.

My boat porpoised rather well when I first took it out on the lake here, I suspect these boats have a little too much rocker in the hull. While investigating a solution, I noticed the jet pump steering nozzle had two possible positions by flipping around the pivot insert on the bottom bolt, so I flipped the insert which pointed the nozzle outlet slightly higher, and that seemed to improve the phenomenon acceptably although it does still porpoise slightly. And I'm not sure if the hole shot or top speed may have been compromised slightly, is possible. I still haven't gone back to test the original position so I can't say anything definitive.

There are also nozzle wedges available that can be used to change the angle of the nozzle just behind the impeller.

I think maybe the previous owner of my boat may have sold partially b/c of porpoising (it was porpoising more than I could've imagined, (it was like "WOW, that's a lot of porpoising!) in combination with the boat needing general preventative servicing and various small repairs he didn't want to pay for.

Boat builders have been known to install cavitation plates on the transom in order to compensate as well, Eliminator did that on another boat I have for this reason. This boat was designed and tested with a specific river in mind but had too much rocker for lake use they claimed so they installed cav plates, is what I heard. I noticed though that most boats of this style have them, including the Sanger v-drives of the time.

Here's a photo of the Sanger v-drive with cav plates. This hull is capable of 100mph+

http://www.marine31online.com/gallery/data/516/1970_Sanger_V_-Drive-Drag_Boat_001.jpg

 

[SLOWBRAH]

That is a mean looking water skipper...



Could you break down the two numbers for the pitch of jet props? "14/19"? I can't seem to find these impellers for my boat. Know where to go to find them? What would best suit me if I'm hoping to gain a few more MPH?

 

[Sportster-2001-951C-Stock]

That is a mean looking water skipper...



Could you break down the two numbers for the pitch of jet props? "14/19"? I can't seem to find these impellers for my boat. Know where to go to find them? What would best suit me if I'm hoping to gain a few more MPH?

Yep, the owner told me it backfired and singed his hair, once. I told him to take all that crap off the top of the motor and get a simple 4 barrel intake, LOL

These are progressive pitch impellers, which is why there are two pitch numbers. 14/19 sounds about right for a boat but you need to confirm with the OEM impeller specs. Impellers need to be carefully selected(especially for boats), there isn't much room for error and even the guy behind the counter gets it wrong, probably b/c the catalog listings by ski sometimes aren't worth beans. More info is here:

http://impros.com/store/index.php/tech-info/about-impellers.html

 

[ken0276]

That is a mean looking water skipper...



Could you break down the two numbers for the pitch of jet props? "14/19"? I can't seem to find these impellers for my boat. Know where to go to find them? What would best suit me if I'm hoping to gain a few more MPH?

14 is the prop's diameter in inches, 19 is the pitch ratio, you may check with this 4 blade 14/19 one and contact the seller for how good its compatible for your boat, adding pitch on the blades would get more top speed but loosen a bit low end.
http://www.iboats.com/mall/partfind...&gd_poid=431651&gd_row=2&session_id=205108036

 

[Aquaman1]

Here is a link to what I have been working on.
http://www.seadooforum.com/showthread.php?66712-Challenger-extended-ride-plate

 

[SLOWBRAH]

14 is the prop's diameter in inches, 19 is the pitch ratio, you may check with this 4 blade 14/19 one and contact the seller for how good its compatible for your boat, adding pitch on the blades would get more top speed but loosen a bit low end.
http://www.iboats.com/mall/partfind...&gd_poid=431651&gd_row=2&session_id=205108036

Thanks! However, that impeller is for an 07+ model. Mine is an 05. I can't seem to find a replacement impeller for my model boat.

 

[xintersecty]

Here is the impeller stuff:


You can pick a manual from the various online companies are become a premium member here.

 

[SLOWBRAH]

WHY wont this fit? What's the difference from 07+???

http://www.ebay.com/itm/Sea-Doo-Sea..._Watercraft_Parts&hash=item2a304b132b&vxp=mtr

 

[Sportster-2001-951C-Stock]

WHY wont this fit? What's the difference from 07+???

http://www.ebay.com/itm/Sea-Doo-Sea..._Watercraft_Parts&hash=item2a304b132b&vxp=mtr

Is 2007 supercharged, is yours NA? If so, likely not the same impeller. Which impeller does your service manual specify?

Aftermarket pitches are somewhat subjective, from the perspective these are progressive pitched props. I would contact the vendor and try to get him to agree to exchange if things don't work out, then he'll take an active interest in making sure he sells you the correct prop.

 

[Sportster-2001-951C-Stock]

seadoo part numbers(you should confirm on your own, I cannot be responsible if you buy wrong one!):

2005 - 267000096 180SC
2007 - 267000285 230SE 215

 

[SLOWBRAH]

Hmm.... I thought my impeller P/N was 204160259? According to a parts diagram anyway. I'm calling Impros tomorrow fo sho!

My boat is charged with an IC. 215hp.


THANKS for the info! I'm sure I'll get this sucker coming out of the water like it's suppose to soon enough.