RAMJET 502 Engine 12499121 Specifications
Specifications Part Number 88962910
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This publication provides general information on components and procedures that may be useful when installing or
servicing a RAMJET 502 engine. Please read this entire publication before starting work. Also, please verify that all of
the components listed in the package contents section below were in fact shipped in the kit.
The information below is divided into the following sections: package contents, component information, RAMJET 502
engine specifications, installation instructions, additional parts that you may need to purchase, torque specifications,
and service parts list.
The RAMJET 502 engine is a fully assembled engine. This engine is assembled using brand new, premium quality
components. The RAMJET 502 engine is manufactured on current production tooling; consequently you may
encounter dissimilarities between this engine assembly and previous versions of the big block V8. In general, items
such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a RAMJET 502 engine when
installed in a vehicle originally equipped with a big block V8 engine. However, as noted in the following sections,
there may be significant differences in the water pump, oil pan, etc., between a RAMJET 502 engine and an older
big block V8 engine. These differences may require modifications or additional components not included with this
engine. When installing the RAMJET 502 engine in a vehicle not originally equipped with a big block V8, it may be
necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems. Due to the
wide variety of vehicles in which this engine can be installed, some procedures and recommendations may not apply
to specific applications.
The RAMJET 502 engine is based on the marine electronic, port fuel injection system, and the Chevrolet
Performance 502/502 crate engine. The RAMJET 502 engine includes an aluminum intake manifold, fully calibrated
Engine Control Module (ECM), wiring harness, all the necessary sensors, distributor, ignition coil, throttle body, fuel
rail, and throttle cable brackets. All the gaskets and attaching hardware required for the components you need to
install are included in the kit as well. This package 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.
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Ramjet 502 Engine
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