Anyone done this and know the ins and outs? is it very complicated?
Cheers
Cheers
Fitting a pjs Viper 5000 to a kawasaki 550
- Thread starter gibbonson66
- Start date
Cheers Mate
I'll get on it
davidescu_radu
sea riders
- Location
- Constanta,Romania
Same engine - easy swap
550headache
tobacco grower
- Location
- tobacco valley
same as any other 550
Yep it's complete engine with exhaust
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Sent from my iPhone using Tapatalk
- Location
- St Charles IL
long block will bolt right into same location
- Location
- Charlotte, NC
should bolt right in however it will be better to run a 440 pump with this engine because the pjs cylinders like to turn lots of rpms to make power... the 550 pump puts too much load on the engine to allow it to reach peak rpms
- Location
- Charlotte NC
cant prop down to achieve desired rpm band?
- Location
- Charlotte, NC
technically yes, however the 550 pump is a mixed flow design and the 440 pump is an axial flow.. the axial flow design is used in every other pump out there except for the 550 pump.. the 550 pump performs much better at low rpms than the axial flow pump where as the axial flow pump does better at higher rpms.. that is why all of the racers back in the 80s and 90s ran 440 pumps.. the 550 pump impeller is tapered and gets larger at the hub.. and has a larger vein section and smaller exit cone.. this design works great for lower rpms and keeping the pump loaded the more rpms, the more pressure.. however at rpms above 7500-8000, the pump will start to work against it self and not let the engine rev past it.. the 440 pump uses much less load on the engine for thrust and will continue to flow at high rpms. those pjs engines make their power in the 5k up to 8-8500 rpm range... this could be lowered some with a long chambered pipe too... when i got my old pjs engine, it was in a ski with a 550 pump with a variable pitch impeller i think 14/19 or something and the engine wouldnt rev out completely.. it would hit a rpm wall and you had to basically unload the pump by jumping out of the water to get the engine to rev out haha.. we put it in my ski with the 440 pump and it was a night and day difference..