and the following dyno run recorded. This engine produced a stunning 147+ HP all the way
from 7800 to 8800! This is the horsepower which can be expected from a stock 1999 Mach Z.
Rich noted that an ignition rev limiter appeared to kick in at 8950 rpm.
Stage 1- Stock Triple Pipes w/ V-Force Reeds
Next, a set of Delta V-Force reeds were installed. The broad powerband remained intact,
and the reeds accounted for a 3.6 HP gain. Rich noted that the water temperature was a
bit warmer on this run, yet the engine still made good power.
Stage 2- Stock Triple Pipes, V-Force Reeds, Dyno Port Silencer
Many riders have been simply adding a silencer to the existing stock pipes, so the next
run was to replace the very quiet stock muffler with a Dyno Port Canister silencer. The
stock muffler measured 88dB in the dyno room, and the Dyno Port silencer registered 92
dB. Note that while the fuel consumption is slightly higher and the water temp is still
warm that the silencer made an unusual 5 HP gain. Rich noted that this could have been
jetted down one more size to make even more power.
|
|
Stage 3- Dyno Port Triple Pipes & Silencer
Rich knew that his Dyno Port pipes made more power than the '98 Mach Z pipes, but
would they be any better than the '99 Mack Z pipes? The V-Force reeds were removed
and the stock cages re-installed. Compared to the stock pipes & silencer, the Dyno
Port pipes did pull over 10 HP more, but compared to the V-Force Reeds and Dyno Port
silencer on the stock pipes, the power gain only amounted to about 2 ½ horse at 200
rpm higher. Rich is quick to point out that the V-Force Reeds really help. Triple
pipes w/ silencer ($699.95), V-Force Reeds ($358.00), silencer for stock pipes ($250.00).
|
|
Stage 4- Longer Headers, thicker base gasket, machined head
Time to get serious. Rich knew from his successful asphalt racing this past
season that the 800 responded well to changing the port timing, so he installed
a thicker base gasket to raise the ports. To maintain the stock compression,
the head was machined to compensate for the gasket change. This brought the
power up to 166.8 HP @ 8700 rpm. Next, the header section of the pipes were
lengthened, pulling the following run of 167.2 HP @ 8500 rpm.
Stage 5- Trail Porting
For stage 5, the cylinders were removed and the Dyno Port engine builders performed
some mild trail porting. All other modifications remained the same, as did the
compression. The power increased by 7.7 HP, still spinning at 8500 rpm. Perhaps
more impressive was that the torque took a healthy jump also, now over 100 foot
pounds all the way from 7800 to 8800 rpm, peaking at 108.8 foot pounds.
|
