Chevrolet Performance RAMJET 350 Caractéristiques Techniques

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This publication provides general information on components and procedures that may be useful when installing or servicing
a RAMJET 350 engine. Please read this entire publication before starting work. Also, please verify that all of the components
listed below are in fact included in the kit.
The information below is divided into the following sections: package contents, component information, RAMJET 350
engine specifications, installation instructions for the components included in this kit, additional parts that you may need to
purchase, torque specifications, and a service parts list.
The RAMJET 350 engine is based on the Chevrolet electronic, port fuel injection marine engine. It incorporates modern
technology in a package that can be installed in applications where 265-400ci small block Chevrolet V8s were originally
used. The RAMJET 350 engine includes a fully assembled block and heads, oil pan, torsional damper, water pump, intake
manifold, fully calibrated Engine Control Module (ECM), wiring harness, all the necessary sensors, and distributor. This
engine is assembled using brand new, premium quality components.
The RAMJET operating system is a very advanced fuel injection control system that uses a minimum amount of inputs to the
engine control module (ECM) for ease of installation. Because of this, there are certain operating conditions that should be
understood to ensure proper operation.
For example, due to the variety of applications and uses, this system has no provisions for vehicle speed input, transmission
range input (automatic) or clutch pedal input (manual transmission) to the ECM. If the Throttle Position Sensor (TPS) is
reading a closed throttle with engine running, the engine controller has no way of determining if it is being driven down the
road or idling in Park or Neutral. If the driver operates the engine in a way that pulls the engine speed below the desired idle,
the normal reaction of the control module is try to keep the engine speed above the minimum RPM by adjusting the Idle Air
Control (IAC) and ignition timing.
If the driver continues to operate the vehicle in this "forced low speed" manner, the IAC and spark may continue to climb until
it is at maximum. If the load is suddenly taken away (clutch pedal depressed, shifter moved to neutral), the engine speed will
be above desired idle. At that point the engine speed will begin to decrease until it gets back down to desired idle speed. To
avoid driving under these conditions, shift the transmission to the next lower gear to prevent "lugging" the engine below the
desired idle speed.
Operating the RAMJET engine at very low engine RPMs and low vacuum conditions is also not desirable from a fuel
economy standpoint. The RAMJET electronic fuel injection system is a speed and air density system ("speed density" fuel
management).
Sensors provide the ECM with the basic information for the fuel management portion of its operation. Signals to the ECM
establish the engine speed and air density factors. The engine speed signal comes from the Ignition Control (IC) module.
The ECM uses this information to determine the "speed" or RPM factor for fuel and spark management.
The Manifold Absolute Pressure (MAP) sensor contributes the density factor. As intake manifold pressure increases, the
vacuum decreases. The air density in the intake manifold also increases as additional fuel is needed. The MAP sensor
sends this pressure information to the ECM, and the ECM increases the amount of fuel injected, by increasing the injector
pulse width. As manifold pressure decreases, the vacuum increases, and the amount of fuel is decreased. These two inputs,
MAP and RPM, are the major determinants of the air/fuel mixture delivered by the fuel injection system. The remaining
sensors and switches provide electrical inputs to the ECM, which
ECM control functions, such as idle control.
Ramjet 350 Engine
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GM SPECIFICATIONS.
RAMJET 350 Engine 19417619 Specifications
Specifications Part Number 19417614
are used for modification of the air/fuel mixture, as well as other
19417614
IR 13SE18
PART NO.
DATE
13SE18 Initial Release - Alin Dragoiu
1
SHEET
REVISION
45
OF
AUTH
N/A