|
| |
BILLET ALUMINUM IMPELLERS CONTINUED:
100% smooth machined finish:
Reduces drag, turbulence, cavitations, maximizing
performance and durability, resulting in more usable horsepower and better
fuel economy.
Lightweight design:
Results in quicker throttle response and higher top
speeds.
CAD Design:
Results in smoother shaft-to-hub transfer, improved
concentricity and balance, vital for improved performance with less drive-line
stress.
Dynamic thin blade design:
Gives you increased water flow, higher performance
with less cavitations.
CNC machining:
Allows smoother surface finishes, and produces impellers
to precision accuracy time after time.
Exclusive progressive pitch design:
For highest efficiency, increases hole shot
acceleration and top-end speeds.
THE MAKINGS OF A BLUEPRINTED IMPELLER.
CAST VS. BILLET:
Imagine a raw unmachined impeller casting, and
holding it in some type of fixture as to drill and bore the shaft hole thru on
the perfect center line of all four blades, its not so easy when no two
casting are alike, especially in a fast paced manufacturing operation.
All the machined surfaces are cut to the shaft center
line, but it is not likely that you will find a cast impeller with the shaft
and blades sharing the same center line, and this is a vital flaw when it
comes to eliminating cavitation problems within the jet drive.
Blade size, shape and degree of rotation are just as
important as blade to shaft center line.
After the expense of detailing, polishing and or
extrude hone, then rebalancing the cast impeller you may see some increase in
performance but you have done very little to correct the major problems.
BILLET IMPELLERS:
Start with a high strength, corrosion resistant,
aircraft quality aluminum bar. working from the pump shaft center line, each
impeller is 100% CNC machined to the highest level of accuracy possible with today's
technology. blades are cut on shaft center line, identical in
size and shape, spaced 90 degrees apart.
Machining operations leave impellers with a smooth
machined finish eliminating the need for detailing or extrude hone.
impellers are heat treated for maximum strength and
hardness then dynamically balanced for vibration free operation, then hard
coated to further resist wear and corrosion, forming a light weight high strength
construction.
virtually eliminating cavitation for a smooth and yet
demanding increase in thrust and top end performance.
TESTING DATA FOR BILLET IMPELLERS:
Testing was performed on two boats with no
changes made to either boats performance except for the impeller swap.
testing included the use of radar and each
test was run over the same course in similar conditions.
BOAT #1:
A 21 foot phantom lightning hull with a 590
cubic inch Chevy cranking out a near 750 horsepower.
TEST #1:
Using a race proven hand detailed cast
aluminum -B- impeller, running a max speed of 97 MPH at approx 5950 RPM, with
a approx fuel consumption of 32 gallons over the course.
TEST #2:
Using a Precision Jet Drive billet 100% CNC
machined aluminum -B- impeller, running a max speed of 102 MPH at approx 5750
RPM, with a approx fuel consumption of 27 gallons over the course.
DRIVERS STATEMENT:
I felt a connection between the throttle and
the water, when I gave it gas I didn't have to wait for the boat speed to
catch-up to the motor speed.
BOAT #2:
A 21 foot ultra bow rider hull with a stock
454 cubic inch Chevy outputting a near 330 horsepower.
TEST #1:
Using a stock cast aluminum -A- impeller,
running a max speed of 58 MPH at approx 4600 RPM, with a approx fuel
consumption of 19 gallons over the course.
TEST #2:
Using a Precision Jet Drive billet 100% CNC
machined aluminum -A- impeller, running a max speed of 63 MPH at approx 4400
RPM, with a approx fuel consumption of 16 gallons over the course.
DRIVERS STATEMENT:
It has a good strong hole shot perfect for
water skiing, the boats momentum keeps right up with the motors acceleration,
it is very smooth running at all speeds, the bottom line in my opinion is the
boat is
now ready for more horsepower.
|
Precision Jet
Drive