1. "Do underdrive
pulleys really deliver more horse power?"
Every experience we have
with underdriving engine accessories shows that yes underdrive pulleys
do deliver more
horse power by freeing up power lost to parasitic drag. The amount
you will realize depends on your car and the accessories you are driving,
a car with alternator, water pump, power steering, A/C and a smog pump
will see a larger HP gain then a car with alternator and water pump only.
Dollar for dollar underdrive pulleys are one of the best value for HP gain on the market. But don't take our word alone on
this, every magazine we have seen who have tested under drive pulleys
has show a HP gain, some as high as 12.5 HP. Click
here to see how 5.0 Mustang & Super Ford "Bolted-on" an
easy 15HP for less than $100! and all in under one hour.
2. "But won't underdrive
pulleys cause a charging problem?"
Again that depends on your car
and how and when you drive. Automotive manufacturers build a certain
amount of extra capacity into their cars for situation of high demand
like driving on a cold rainy night with the lights on plus whippers and
defrosters going. An older car with a less then optimum charging system
and a small
pulleys and some cars with monster audio installations require higher
that normal electrical demands. A well maintained auto should have no problem
at all. Sometimes
raising the idle by 100 RPM is all it takes to bring the charging rate
back up to normal.
If electrical charging is an issue with your particular
application March Performance has a smaller alternator pulley available
to increase alternator output but to still allow a HP gain from underdriving
the other accessories.
3. "Won't underdrive pulleys
cause a engine cooling problem?"
Again that depends on your car
and how and when you drive. Putting underdrive pulleys on cars with already
minimal cooling capacity could conceivably push the car into overheating
but our experience is that 99.9% of the cars out there has enough reserve
cooling capacity to use our pulleys. Some user find that the simple installation
of a cooler thermostat is all it takes to bring the temperature back into
normal range. Underdive Pulleys can in some cases cure cooling problems.
With racing applications cavitation can be a problem at high rpms. When
Coolant must also stay in the radiator long enough to lose
heat before returning to the motor so you can actually move coolant too
fast. Both these issues can be solved by using underdrive pulleys.
But If low speed cruising is your thing then March
Performance line of High Water Flow Ratios pulleys may be just what you
need to prevent
overheating in those situations.
4."Underdrive pulleys sound
good but won't an electric water pump set-up give me even more HP?"
Yes it is conceivable an electric water pump can give you more HP than
a underdrive pulleys set BUT there are some issues you should consider
that commitment. Your HP gain with an electric pump may not be as much
as you think, in a recent test Hot Rod Magazine ran our performance ratios
pulleys on a small block Chevy (alternator, water pump only) and to their
surprise our pulleys only made 1 HP less then
a electric water pump set-up. You should also consider that electric
kits flow even less water then a underdrive pulley kit and that could cause
cooling problems. Most electric WP are made for racing applications
and not designed to be run for long periods of time, and if that electric
motor gives out you
are stuck with no water flow at all unlike a standard water pump which
may start to leak and make noise but can allow you to limp home. The
electric pump does draw power from your charging system and so you can't
you must have adequate electrical power just to drive the water pump.
5."How hard are they to
Unlike engine modifications like cams, cylinder heads and intake and exhaust, underdrive
car. Some special tools are required such as an impact wrench to zip off the alternator
puller if your installation requires removal of the crank pulley/dampner assembly but all
and all most kits are a simple "Bolted-on" operation.
Mustang 5.0 pulleys can be installed without even draining the cooling system, Click
here to see how to "Bolted-on" in less than an hour.
Even if you are not the do it yourself type any automotive shop should be able to install
your pulleys at a reasonable price.