SX/SXi/SXi Pro sj pump to sx hull

[backflip765]

hi guys, in need of a bit of tec advice. can anyone tell me how a pump is supposed to sit ? ie when i bolt the thing on is it supposed to point down by a few degrees at the reduction nozzle end, or is it level with the ski ? any info would help as i need to set the pump position before the pump shoe

 

[dbattersby20]

i believe it should be level, but making it point down would not be uncommon because that will help to keep the nose down. So it will depends on your weight, ski and riding style. there's no correct answer.

 

[backflip765]

well it fits !!! got the mid shaft and pump lined up, only a few minor mods needed to get the thing fitted proper, hull is making progress (in between house moves) and have just about all the bits i need to finish the job off

 

[backflip765]

had to chop a lump out of the floor to get the pump to sit lower, this is so i can keep the stock ride plate, new mounting points will have to be made and a bit built up to get the pumpshoe to fit proper, all good so far !!

 

[fastgtfairlane]

i cant say i see any benefit going to a 144mm pump setup over a 140.. that 4mm i dont think will make enough difference to really tell and be worth the effort swapping it in...besides many of the aftermarket hulls run the kawi pump anyways.. ive seen on here some mag pumps for kawis that are 12 vein that will swap right in and use the same impeller...i would say that is your best bet and least work...i believe i saw the vein section for 500 bucks?

 

[dbattersby20]

i cant say i see any benefit going to a 144mm pump setup over a 140.. that 4mm i dont think will make enough difference to really tell and be worth the effort swapping it in...besides many of the aftermarket hulls run the kawi pump anyways.. ive seen on here some mag pumps for kawis that are 12 vein that will swap right in and use the same impeller...i would say that is your best bet and least work...i believe i saw the vein section for 500 bucks?

It increases the area for which the water flows through by almost 6% which gives more bottom end thrust. those mag pumps are nice and everything but won't fit into a 650sx hull without doing modifications. At the same time though a well set up and tuned 650sx pump will probably outperform a run of the mill 144 pump just thrown into a hull. personally i plan on swapping in an sxr pump cavity into my next/first build or just a 750 pump. and will probably run the matching pump. i don't like the design of the yami driveline set up compared to the kawi.

 

[backflip765]

thanks for the comments people, the idea is to build a surf boat, freeride etc, so its the extra bottom end hit im after. $500 for a pump !!!! jez, try about £120 for a complete sj set up, bearings and all !! plus i have a much wider range of add ons with the yam pump, tbm, blowsion etc to fine tune the thing when i finaly get it running.
AND i have finished/filled the outside of the hull, just need to get the wider bond rail folded and bonded on then i can seal and paint the thing

 

[backflip765]

templates done for the new exhaust im making, first attempt on the left, finished one on the right

 

[JGringo]

Impressive work... Can't believe you do this all outside haha. Mad Props for taking a project on like this.

Quick question,
What do you mean by 'exhaust templates'?

Did you use a computer program to solve for all the cross-sections of the exhaust pipe given the specific port
timing of your engine? Or are the templates just estimated??

Estimation = Detonation.

 

[backflip765]

thanks JG, i used a computer programe, the template will be etched onto alloy, seam welded then pressure formed, i have also cross refrenced it against a coffmans, but this one has a double diffuser, shorter belly and slightly bigger stinger, the only part im looking to fine tune after is the stinger diamiter, i will be making some inserts for this bit, plenty of tuning to do when i get it on the water !!

 

[backflip765]

View attachment 176647View attachment 176648new pole brackets and the extended bond rail ready for the alloy ones being made as we speak

 

[backflip765]

pole brackets finished off and the tray sides have been re-enforced with a ggod few layers of woven roving, wide bond rails and foot holds in this week then i can get some colour on it !!

 

[Snivilous]

You said you shortened it 8", where, in the front?

 

[backflip765]

its not all at the front, i have whipped off about an inch and a half from the back end, the tray sides are shorter so trimmed the rear bond rail

 

[D-Roc]

This is a cool Kawi build. Putting that pump in is a smart move.

 

[Brian_216]

Just wondering why all the work to swap the pump when there is a 145 available that bolts right in the 750sx/ sxr? MAXX on here is building them and they are reasonably priced.

 

[D-Roc]

144 pumps are cheap and work good?

 

[ridburton06]

Just wondering why all the work to swap the pump when there is a 145 available that bolts right in the 750sx/ sxr? MAXX on here is building them and they are reasonably priced.

Do you know the link for these?

Sent from my DROID BIONIC using Tapatalk

 

[backflip765]

Just wondering why all the work to swap the pump when there is a 145 available that bolts right in the 750sx/ sxr? MAXX on here is building them and they are reasonably priced.

im on a budget, total pump cost so far inluding skat prop, is about £120 ($180 ish) offset that against the £100 i got for the kwak pump and its a cheaper option, i have had to do deals on most things on this build, if i need cash i make footholds, chinpads etc and sell them, total outlay for this build is around the £400 ($600) mark, and i have all the parts i need, and its been an easy swap so far, new mounts etc i will be looking at 3 hours work

 

[backflip765]

starting to take shape now, flowcoat finish to go on, hood inner and top bonded together, and a set of tubbies made from moulds i did last year, ready to go on