Profi Quickee 500 6.5cc
The new Profi 6.5cc Q500 engine for AMA class 428 is a very
exciting. The development of this new engine was in process for over two
years. Check out the design features below.
This engine brings the proven
features of true world record holding Profi competition engines to Q500 racing.
Pricing for the
Q500 engine has been impacted by the recent currency exchange
rates but we are going try and maintain the original price for the near future.
Current price at this time is $385.00
See Profi Q500 Parts for the current engine spare parts list.
Some of the features:
-
AAC
piston and sleeve. Profi has the best piston
material in the world and that is what makes the big difference in all
Profi engines.
-
Absolutely Perfect piston to cylinder fit. Very
tight while cold, perfect at running temperature.
-
Integral rear bearing with the crankshaft forming
the inner race of the rear bearing. Borrowed from Profi FAI competition
speed engines where this is a standard feature but never seen on an
American built racing engine. The result is a truly free bottom end. A side
benefit is the very high quality steel used to make the crankshaft.
-
Stiffer Crankshaft resulting from the larger
diameter at the junction with the crank disk and forming the inner race of
the rear bearing. The dead free crankshaft rotation adds a small improvement
in rpm compared to any regular ball bearing engine.
-
Balanced crankshaft, no external balance. This
engine runs so smooth you will not believe it. 18.5mm crankshaft.
-
Crankshaft has 12mm gas passage with an exclusive
asymmetrical configuration resulting in improved torque band at operating
rpm.
-
Flow smoothed and angled crankshaft inlet port,
for improved intake performance.
-
Domed piston. Slight RPM improvements result from
the domed piston again adding to overall performance.
-
Front Bearing Retainer. The front bearing is held
in place by a screw-in bearing retainer, one more item borrowed from FAI
competition engines. And again the stability of the crankshaft results in a
small rpm improvement.
Test flying is indicating that
the Profi engine uses just about the same propeller combination as the current
top engines. The test engines have shown great flexibility in propeller choice.
This site was last updated
by Judith
01/01/08 | 
