Cams and the I-5 10v NA Engine Development(Long)

["Mik Tip" <miktip@surfnet1.net>]

If you install a "mild" Schrick (or other)cam shaft  in a
"TOTALLY STOCK" engine, your results will be "minimal" at best.

Why?

Because you really haven't "changed" or "improved" enough for
the engine to gain the "full benefits" which can be derived from such a
cam shaft.  This is especially true of a "hydraulic cam" because your
limited
by the hydraulic lifters.  Mechanical cams are available with
a much more "aggressive" grinds, lift and duration's.

My CGT engine was a measly 8.5:1 compression ratio in "stock" form.

I "align bored" the block of an 1988 5k (with piston oil squirters) to
accept
a set of 83.028 Mahle(special pistons) with an 10.5:1 compression ratio.
These pistons were also machined to remove excess material, (lightened)
balanced and the oil control rings changed.
    Pistons: $500
    Machine work: done by myself

The crankshaft was taken to Lunati(Stock Car fame) in Memphis, where
it was lightened, balanced, and micro-polished.
    Machine work:(off season time) $235

The connecting rods were lightened, balanced, and installed a
 set of "Raceware" rod bolts.
    Parts: Raceware bolts- $135
    Machine work: $50

Flywheel had 2lbs of material removed, balanced.
    Machine work: done by myself

New engine bearings and seals throughout entire engine.
    Parts: $450
    Install: done by myself

The head came from a 1988 Audi 5K NA, because of the
40mm intake valve, and "improved" ports over the original head.
Ported and polished, tested on a Flow bench, improved CFM
capacity.  Valves received a "5 angle" radius and seat, as well
as their backs (intake side) were "highly" polished!
Intake runner ported and throttle body ported to accept larger
butterflies.  HERE"S where that cam will shine!  By improving
performance (airflow) INTO and OUT of ,the ENTIRE intake/exhaust
system, the cam can reach its maximum potential!  Combine this with
the "improved" lower end, and you have the makings of some good
power increase!

    Parts: paid $50 for 88 5K engine, complete!
    Machine work: done by myself

Exhaust system fabricated  with 2.5 inch pipe, and "performance"
mufflers.

    Parts: $300
    Fabrication: done by myself

Tubular header installed.  Jet Hot coated!

    Parts: $500
    Installed myself

Airbox modified to "improve" airflow.

    Parts: $30
    Fabrication: done by myself

Fuel Injection system "enhanced" for improved fueling requirements.
Installed an adjustable pressure regulator, which operates "normal"
at a higher pressure that stock.  Installed special electronic
device to adjust "rich/lean" settings while driving.

    Parts: $150 (from salvage yard)
    Fabrication: done by myself

Adjustable Cam sprocket installed.  Allows you to "tune" your torque
curve within the rpm band.

    Parts: $100
    Installation: done by myself

Over all I spent well over $2000 on parts.  Where I saved TONS
of cash was doing much of my own work.

Why did I mod the NA?

Curiosity.

Would I do it again?

If some else was flipping the bill, sure.

Would I go Turbo?

You get more "Bang for the buck" with the turbo!  200+ ponies!

Although my CGT is quite a "joy" to drive!  The car is more
"balanced" now with the added power!  Its at the level Audi
should of built them with at the factory! (My own opinion)

Is the car fast?

Definitely!

But what makes it such a joy to drive, is knowing the power IS THERE
when needed, and its instantaneous!  Those that have gone for a drive
ask "Do you have a turbo in this thing?"

                        Mik