No smoke, no mirrors, just fast.
Policies
and Warranty Statement
3.6 Engines come in the following flavors:
- 964 engines (C2) are essentially the same with
the
following
important exceptions
- 1989-1991
early 964 engines have an aluminum intake manifold and did not
originally
use head gaskets. SOME of these engines had problems with minor
leaking
from the cylinders and were warranted by Porsche. With rare
exception,
this is not a big issue. Although the later engines are more
desirable,
we have installed several of the early engines and have had very good
success. (click
here)
- 1991
late-1994 964 engines Later engines have a head gasket sealing ring
and plastic intake manifolds but are otherwise the same as 1989-1991.
the
change in head gasket style occurred in late 1992. (click
here)
- Click
here for explanation of the early head leakage issue
- The stock 964 exhaust severely restricts
performance and is difficult to fit into a conversion and should be
replaced. Upgrading to 993 exhaust with a free flow muffler will
add close to 20 HP, but that has be be purchased separately and adapted.
- 1995
993 engines are similar to the late 964 engines, but have
- larger intake ports, stacks and manifold
runners
(43 is 41.5mm)
- larger exhaust valves (42.5 is 41.5mm),
- hydraulic lifters (which should be converted
to
solid lifters
for racing applications)
- lighter crankshaft and pulley assembly
- much improved revised exhaust system
- mass flow sensor from the factory
- more advanced engine management.
- Factory power rating is significantly up from
the
964 engines
but most of this is attributable to the exhaust system . Chips
are
available for these engines. Contrary to popular belief the Mass Flow
sensor
makes very little, if any, difference on these motors over the 964
motors.
Back to back dyno tests show a difference of 2-3HP gain between same
motors.
- 1996-1998
993 US VarioRAM Engines: These engines have ODB-II style
DMEs and must be flash programmed. This service is relatively
expensive ($875) but we can now perform that in house. Our
preference is to either use 1996-98 European electronics (as below) but
this has becomes prohibitively expensive since the DMEs are difficult
to
find and the harnesses have gone from $450 list to $1350 list! Click Here for VarioRAM Explained
- All Attributes of 95 993 Engines but:
- ODB-II DME which must have drive block (Alarm
disable) removed to run
- 50mm Intake Valves
- 4 Oxygen Sensors
- 1996-1998
993 EUROPEAN VarioRAM Engines: These engines are similar the
US engines but they do not have the OBD-II style motronic. They are
easily
identifiable since they have:
- 55-pin DME connectors, most boxes are
993.xx.418.011
- One Oxygen Sensor.
- The alarm system is integral with the
computer
system, if
fitted.
- Cyntex after market chips are available for
these
units.
- VarioRAMs: THESE ENGINES
ARE
INCREDIBLE!
I recommended against them until I put on in my 1972 targa. They
pull down low like an American V8 and only the European 96-98 engines
have
larger intake and exhaust valves that all the other motors. If
you
can afford it, go for it!
- Combinations:
We have successfully retrofitted VarioRAMs to the earlier motors with
good
results. The VarioRAM itself is not worth much power but gives a
broad torque band, with a 20% increase in torque from 3000-5000 RPMs
but needs
some special electronics to manage.
- 3.8 liter engines - These
are
available
from the factory on a very limited basis or can be built up from all
3.6
varieties. Click here for the truth about 3.8s.
Bottom Line: All of the engines are about the same to
install.
- The 964 engines are the least expensive.
On the other hand you will have to completely replace the exhaust
system, so if you want heat, these savings may evaporate..
- The VarioRAM is the most powerful and makes the
most torque, but expect to pay for it, and tun ability is
limited.
- The 95 motors are a good compromise and can
easily be upgraded to VarioRAM.
Click
Here for detailed Explanation of the engine types and why the VarioRAM
works so well.
Related Links:
Info at:
302-456-0630 or 302-559-5905
[email protected]
E-mail preferred!