Racing Ignition "Crank Fire"
The distributor type ignition has been with us since 1910.
The first 911's had a simple ignition system similar to the 912. They were prone to
being unable to fire their spark plugs consistently.
The reason was that the new 911 engine revved up very fast, and having more than 4
cylinders, gave the coil little time to recover and fire as often as required. A four
cylinder has about 50' of dwell for the coil to charge whereas the six cylinder has only
38' of dwell.
In 1968, Porsche added a CD box to help the coil do its job more efficiently.
Another problem with a distributor type single coil is that as the voltage is increased
and passed through the distributor, cross-firing between spark plug wires and terminals
inside the distributor cap occurs. Over the years Porsche has made the cap larger.
With Crank Fire you have a 4" x 12" control module. There are three coils
mounted on its billet base. There is also a crankshaft pulley with notches around the
edge. A magnetic pickup pointer is mounted .50mm from the pulley's edge.
A single wire goes from the pickup to the control module. When the engine is running
the coils take turns firing the spark plugs.The pickup fires each cylinder in the proper
order.
On the control module is an adjusting knob to set the rev limiter, along with three
more adjusting knobs that allow you to plot the advance curve. This allows you to use a
curve that matches the requirements for a modified engine. Example: Your engine has more
aggressive camshafts. In order to get the greatest horse power, the engine will need more
timing at lower R.P.M. values. It is a simple matter to turn the adjusting control knobs
to a new curve and then do a road test to confirm its effectiveness.
There are no moving parts to wear out or replace with the Crank Fire. Motor Meister's
Crank Fire ignition systems are the most complete systems sold in the Porsche market.
Other kits come with only modules and the crank plate and do not supply technical support
from a true Porsche mechanic. Motor Meister provides a step by step procedure for the
'do-it-yourself ' individual.
Motor Meister's Crank Fire kit for single plug:
1 - Billet crank pulley (standard or for A/C)
1 - Distributor block off plug
1 - Full set of performance Racing ignition wires
6 - Spark plug ends, already fitted to the wires
1 - Complete coil module with coil packs
1 - Magnetic sensor
1 - Magnetic sensor bracket
1 - Crank Fire hand book manual
1 - Technical support from head Porsche mechanic Lee Marks
"NEW 2001" Complete kit for 6 Cylinder
$1295.00
Complete kit for 6 Cylinder Twin Plug
$1995.00
* We do custom work also for specialty applications * |
For Street or Race
