Integral
Profiles Available Now! In
2010, Integral Cams shut down their operations and sold the rights to
their intellectual property to MegaCycle Cams in California. MegaCycle
has not been servicing the Porsche community due to lack of familiarity
with the various platforms.
At this time, MegaCycle
is not producing new Porsche
cams from billet. The only available option for now are hardfaced cams
on customer-supplied cores.
Hardfaced cams are
produced by welding additional material onto the existing stock cam,
regrinding to the specified profile, and then heat-treating the
camshaft for durability. This process has two distinct advantages:
Improved
wear characteristics when compared to OEM cams or billet ground cams
Unlike
offerings from Elgin, WebCam, EMW, and others, this process maintains
the OEM cam circle and eliminates the need for lash caps to maintain
valve adjustments.
Definitions
Improved
Stock: modern design with better
valve control, slight warmup
over stock profile
Stage
1: "hot street" cam,
no low end loss with modest
gains in mid-through-high RPM
Stage
2: for use with free flow exhaust
Stage
3: ideal for club race
events
Stage
4: race only
Hardfaced
Cam (select profile) Allow 2
weeks for processing, not including shipment times. Requires customer-provided OEM
camshaft.
Contact us if you need help locating a camshaft core. Shipping
instructions will be provided upon receipt of order.
Integral Cams
hot street profile for 931
For complete details on
cam profile specifications and run-in procedures, please visit the Integral
Cams website, which is being
maintained by MegaCycle.
Big
Valve Kit by European Motorworks Exclusively
from Ideola's Garage! We can now source the complete valve train
package offered by European Motorworks in their fabled "Big Valve"
head. The package includes the following components:
Qty
4: 44mm intake valves, 8mm stems
Qty
4: 37mm exhaust valves, 8mm stems
Qty
4: 44mm intake valve seats
Qty
4: 37mm exhaust valve seats
Qty
4: spring seats for exhaust valve springs
Qty
8: valve guides
Qty
8:
valve stem seals
Qty
8:
CNC'd chromoly retainers
Qty
1: set of heat-treated valve keepers
Qty
1: complete set of heavy duty dual valve springs for Porsche 924
(1.550" of lift 170 pounds of seat pressure)
If
you don't need the entire package, we can also order individual
components. Please contact
us
for pricing.
EMW
Big Valve
Kit Suitable
for
all 1977-1984 2.0L 924/931. Allow 1-2 weeks sourcing and packaging of
the kit components.
For
a more economical alternative, you may wish to reuse your stock valve
spring set. Suitable only for stock or Stage1 cams. High lift cams
require the heavy duty springs included above.
We
recommend that the valves be
ordered uncut, and a little longer than stock so that your machinist
can match them specifically to your cam and lifter setup. If desired,
the valves may be ordered in OEM-spec lengths:
NA
= 137.2mm intake, 136.95mm exhaust
931
= 133.2mm intake, 133.35mm exhaust
Big
Valve Kit
Ishihara-Johnson
Crank Scrapers
& Windage Trays Ishihara-Johnson offer crank
scrapers and
windage tray setups
for all Porsche 924 & 931 2.0L engines. Available with steel or
teflon scrapers, we can confirm that the standard scrank scraper also
works out-of-the-box with our special stroker combination using Crower
Rods and stroker crank (note that other stroker setups might require
custom trimming of the scraper blades).
Less
rotating mass for the engine to accelerate because of the removed oil
Less
loss of power because of excessive drag caused by the windage cloud
Reduces
engine-damaging oil foaming
Minimizes
oil starvation by keeping the oil in the pan during hard braking
Improves
cooling of critical engine parts by quickly returning heated oil to the
sump
Prevents
the
cylinder walls from being overloaded with oil
Can
improve fuel efficiency
Full windage
and teflon scraper for 924
Suitable
for
all 1977-1984 2.0L 924/931. Kits include ten socket head cap screws
(Grade 12.9; use factory torque specs).
Single Scraper,
Steel Single Scraper,
Teflon
Single steel
scraper for 924
Dual Scraper,
Steel Dual Scraper,
Teflon
Full windage
and teflon scraper for 924
Full Windage, Steel
Scraper Full Windage,
Teflon
Scraper
Crower
Rods In
2007 we worked directly with Crower to develop a replacement rod for
the Porsche 924 2.0L platform. These rods are identical to OEM rods in
all critical dimensions (big end specs, little end specs, and length),
but were especially designed with a lower profile shoulder and bolting
arrangement. As a consequence, these rods may be used as a direct fit
replacement for OEM applications, but can also be used in conjunction
with a stroker crank without requiring any material removal on the
block.
Benefits
about
40% lighter than stock rods
reusable
hardware
integral
little
end bushes (OEM bushes are NLA!)
beefier
I-beam construction
low
profile shoulders and bolts
Specifications
Rotating
Weight: 447
Reciprocating
Weight: 173
Total
Weight: 620
Center-to-Center:
5.669
Big
End Diameter:
2.0316
Big
End
Thickness: 1.100
Pin
End
Diameter: 0.9447
Pin
End
Thickness: 1.100
Rod
Material: Steel
Lube:
90898
Stretch:
.004-.006
Torque:
45 lbs.
Lightweight
Connecting Rods Suitable
for
all 1977-1984 2.0L 924/931. Suitable for stock crank or strokers. NOTE:
these are custom manufactured parts.
Please allow 6-8 weeks for manufacturing and delivery.
Lightweight,
low profile rods for Porsche 924 2.0L
At
left: depiction of recommended squirter notch. At right: comparison of
Crower (top) to OEM (bottom)
Diamond
Pistons We
can now source a variety of piston configurations through Diamond
Racing, including US-spec and Euro-spec configurations for normally
aspirated applications, and US-spec 931 applications. Options include:
custom
compression ratio
custom
dish volume
OEM
spec
bores of 86.5mm, 86.75mm, 87mm, or custom bores up to the block's
maximum (approx. 88mm)
valve
reliefs
offset
pin
height for strokers
custom
coatings (ceramic tops, teflon skirts)
Diamond
pistons are forged from 2618 or 4032 aluminum and CNC machined. All
piston sets include wrist pins, retainers and rings. The inclusion of
rings in the price makes these an attractive option, as oversize
ring sets for OEM pistons are nearly half the cost of a completely new
set of Diamond pistons!
How
to Order
These
pistons are not off-the-shelf items for Diamond. Consequently, orders
require some detailed information in order to properly specify the
critical dimensions. Diamond has provided us with a tool to assist in
calculating the specifications, so please contact
us for more information.
Directional
Pricing, Complete Set $695 per set of 4
Available
for
all 1977-1984 2.0L 924/931. Price per set, including wrist pins,
spirolox retainer, and complete ring set. NOTE:
these are custom manufactured parts.
Please allow 6-8 weeks for manufacturing and delivery.
Price
may
vary with options.
Special
Coatings $45 per slug
Ceramic
coatings on the crown improve the piston's resistance to detonation and
heat damage. Teflon coatings on the skirt decrease friction and wear.
Diamond
piston vs. OEM piston, 931. Setup with offset pin height to accommodate
stroker crank. Ceramic coated top and teflon coated skirts.
Performance
Exhaust Systems Designed
specifically for freeing up the exhaust on the normally aspirated 924,
we can provide three options for exhaust headers from Stahl, Bursch and
MSDS. We can also provide the Bursch complete exhaust package at prices
significantly below MSRP.
Stahl
exhaust header for 924 NA
Bursch
exhaust header and racing exhaust system
MSDS
exhaust header for 924 NA
A Word
About
Coatings
Based on several reports from the field, we strongly discourage the use
of
header wraps, as they trap heat and moisture and will lead to premature
failure of any of these headers. For racing applications, we strongly
recommend ceramic coating both inside and outside the header. MSDS
provides this as a service (see pricing above). Altnerative, we have
several local sources who can provide ceramic coating services, so
please inquire
if you
need assistance in this area.
Stahl
Headers 1-3/8"
header,
suitable for all
1977-1984 2.0L normally aspirated 924. Fully assembled. Cleaned with
special cleaning compound and painted with a special 1800°
paint.
Bursch
Tuned
Headers Suitable
for all
1977-1984 2.0L normally aspirated 924.
1.5" - 16 gage header
designed for increased power and fuel economy. EGR provided, but may
alter emissions. For racing or off-road use only.
Bursch
Tuned
Exhaust, 77.5-onward Suitable
for 1978-84 2.0L normally aspirated 924. 49 state
cars does not
remove catalytic converter. Bursch
Tuned Exhaust, 76-77 models Suitable
for 1976-77 2.0L normally aspirated 924. This model
comes with adaptor supplied to fit 76 & early 77. 49
state cars does not remove catalytic converter. MSDS
Headers Suitable
for all
1977-1984 2.0L normally aspirated 924
MSDS
Ceramic Coating Add
the
MSDS header to your cart, then add coating option.
MSDS
Nickel Chrome Coating Add
the MSDS header to your cart, then add coating option.
Stroker
Crankshaft These
stroker
cranks are produced for us by a couple of Detroit area crankshaft
specialists. The process used is to weld additional material onto the
rod journals, and then to offset grind the journal, adding .25"
(~6.35mm) to the stroke for a total of 90.75mm. When coupled with
oversize pistons between 87-88mm bore, the result is a 10% gain in
displacement (2.2L).
The advantage of this approach
is that OEM rods and bearings may be used, although OEM rods will
require the bottom of the cylinder walls to be ground for clearance of
the rod shoulders. The Crower rods make a nice addition to the stroker
package since they are lighter, stronger, and smaller at the shoulder,
but identical to OEM rods in all other critical dimensions. Stroker
cranks REQUIRE pistons with offset wrist pins.
How
to Order
These
stroker cranks REQUIRE a core crank to be sent in The core must be
examined by the craftsman before pricing can be established. To arrange
for crank development, please contact
us.
Directional
Pricing $500-$650
Available
for
all 1977-1984 2.0L 924/931. Includes balancing. NOTE: These are custom
modified components. Please allow 6-8 weeks for service and delivery.
Price
varies depending on condition of core provided. REQUIRES a usable crank
to be provided. Price may increase if main journals require servicing.
Additional services such as knife-edging and lightening can be provided
upon request.
Ishihara-Johnson offer crank
scrapers and
windage tray setups
for all Porsche 924 & 931 2.0L engines. Available with steel or
teflon scrapers, we can confirm that the standard scrank scraper also
works out-of-the-box with our special stroker combination using Crower
Rods and stroker crank (note that other stroker setups might require
custom trimming of the scraper blades).
