Cavalier, Ecotec, Sunfire & S10
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IPP Adjustable Cam Gears
Chevy Cavalier 2.2, Pontiac Sunfire, Chevy S10 ('94-02)
What do Adjustable Cam Gears
Do? Do I Need Them?
Adjustable cam gears (or sprockets) allow you to move your
camshaft lobe center for better engine tuning. If you are racing
your vehicle, you should have adjustable gears. If you have
surfaced your head, or decked the block, you need adjustable
Improving Mid Range to High RPM's:
In order to improve mid range to high RPMs there has
been an existing problem of getting enough adjustment in the
cam. Two of the most important factors are the lobe separation
and Lobe centerlines. Because the 2.2 engines have a module
distributor, it's impossible to be able to adjust the cam (where
it is not connected to the camshaft itself), like in a SBC where
it could adjust advance and retard by turning the distributor.
The only other way to accomplish this is to adjust the cam
itself. Because of the cam gear design from the factory the cam
can only be set up for a (straight up) adjustment.
Lobe Separation and Centerline
The lobe separation cannot be changed because it has already
been cut into the OEM or performance cam when it is ground, so
there is no way to change it after.
Lobe centerline is the angle in crank degrees a cylinder piston
coming to TDC and event of maximum intake lift. Exhaust
centerline is the angle in crank degrees between the event of
maximum exhaust lift and that cylinder’s piston coming to TDC.
Advance measures the angle of rotation in crankshaft degrees
between the point where both centerlines would be the same and
the actual intake centerline, this CAN be changed by
advancing or retarding the cam.
Under normal conditions it is accepted that by advancing the cam
centerline will move the RPM and torque curve to low to mid
range, by retarding the cam the centerline is moved from mid
range to higher RPMs.
ADVANTAGES of Our IPP
What we've done at IPP is to
cut additional keyways in the cam gear to adjust the cam from
and added 2 & 3 degrees retarded and 2 degrees
advanced. This is a VERY exact process as just .0001 can
change the cam adjustment! We've had an ISO machine shop
design and machine our gears for maximum tolerances. The advantage of this is to allow the street performance
drag & oval track racers to adjust there RPM levels. For
street performance and turbo applications the ability to
increase RPM’s allows for a wider range to build peak HP.
This is a real advantage to oval track applications - if you
need more on the corners then advance the cam, if you need more
on the straight-aways (or move to longer tracks), retard the cam
for more mid to upper RPM’s.
Adjustable Cam Gear a MUST
for Timing Adjustments:
On the 2.2 Cavaliers, there is no way to adjust the timing on
this motor except for a slight amount (which we can do by
adjusting the ECU). Unlike the
SBC and other motors with adjustable distributors, where you can
adjust the total timing so that the events take place earlier
for mid to high RPM use, this cannot be done on the Chevy
Cavalier. Because there is no distributor adjustment, the
only way is the mechanical adjustment with our IPP Cam Gear
here. Even if you have an OEM cam and want to get the timing set
to its best setting, this can't be done without a timing gear.
If you are into any type of performance level of Street, Ovel
Track or Drag Racing this is a must, as there is no other
way to adjust the proper timing for the motor. Additionally, the
timing setting from the factories are not correct, as they are
mass produced. With the proper timing, you can gain anywhere
from 3-15HP depending on the application.
And maybe the best advantage? The price is only $149!
Chevy S10 ('94-02)
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