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Additional parts that may be needed:
Flywheel / Flexplate:
Like all big block V8 engines, the RAMJET 502 engine has 3.58" diameter flywheel flange bolt pattern. This engine comes equipped
with a 14" diameter flexplate with a 168 tooth ring gear, part number 10185034. If your application requires a flywheel, part number
14096987, should be used. This flywheel is 14" diameter, 168 tooth ring gear, and is a for 11" diameter clutch. Use flywheel bolt part
number 12337973 (6 required).
Pilot Bearing:
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing
aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and
rapid clutch wear. A roller pilot bearing, part number 14061685, is recommended for this engine. This heavy-duty bearing adds an
extra margin of reliability to a high performance drivetrain.
Oil Pan:
The RAMJET 502 engine includes oil pan, part number 10242245. This six-quart pan was originally designed for marine and truck
usage and may cause interference problems when installed in certain applications. Check for clearance before installation of the
engine. If the sixquart pan will not fit into your application, part number 12495360 is recommended as a substitute. This is a four-quart,
right-hand dipstick oil pan, which comes with the gasket, four main cap bolts, oil pump screen, dipstick and tube.
Fuel Pump / Fuel Lines / Fuel Filter:
The RAMJET 502 engine does not include a fuel pump. The fuel system in your application must be capable of supplying a minimum
of 45 gallons per hour of fuel. The operating pressure of the fuel pump must be within the range of 43 - 55 psi.
Proper fuel pressure is essential to the correct operation of the RamJet 502. Below are the specifications for expected fuel pressure
under various operating conditions.
Idle =
Steady Cruise =
Wide Open Throttle =
An in-tank fuel delivery system from a Chevrolet vehicle is recommended for use with this system. The fuel system from any Chevrolet
vehicle originally equipped with a port fuel injection system and a V-8 engine is a possible candidate. Production Chevrolet fuel pumps
that would be good a candidate include the Vortec truck fuel pump. Carbureted and Throttle Body Injection fuel delivery systems will
not meet the needs of a port fuel injection system. They do not provide enough pressure at the fuel rail.
An in-tank fuel system is recommended for a number of reasons. First, a Chevrolet production in-tank system will ensure that no
vapor lock issues arise. Vapor lock is a common problem with in-line fuel pumps. In high ambient temperatures the fuel in the fuel
line can vaporize. An in-line fuel pump cannot move this vapor at the levels required by the fuel injection system. As a result, the fuel
pressure at the fuel rail drops, and a number of problems arise. These problems include a stumble or sag to a worst case of a stall
and no start condition. Using a Chevrolet in-tank fuel system will ensure that this problem does not occur on your vehicle. Second, the
in-tank fuel delivery system will have a return line plumbed into the fuel sender unit. This return line is required for proper operation of
this system. The fuel regulator, mounted at the fuel rail, maintains the correct fuel pressure being fed to the injectors, based on intake
manifold vacuum. In general, the fuel pump will supply fuel at a pressure greater than required at the rail. The regulator then bleeds
off this extra fuel to maintain the correct pressure. The fuel that is bled off needs to be carried back to the fuel tank, via the fuel return
line. Third, the fuel tanks used with in-tank fuel systems have baffles in them. These baffles ensure that the fuel pump will have fuel
available as long as a sufficient amount of fuel is in the tank. The baffles keep all of the fuel from collecting at one side of the tank
during hard cornering, or at the rear of the tank during hard accelerations.
If you are installing this package in a vehicle that was originally equipped with a carburetor, the fuel lines will need to be upgraded as
well. The lines must be able to handle the increased pressure required by the fuel injection system. Do not use barbed fittings or worm
clamps to secure the pressurized fuel lines. Also, ensure that the rubber lines are removed and replaced with fuel lines of sufficient
strength, Aeroquip AQP fuel line hose with a stainless overbraid and AN style fittings for example. Finally, use caution in routing the
fuel lines to ensure that the lines are not located too close to the exhaust system and are protected from road debris or obstructions.
The fuel filter recommended for use with this system is part number 25171792 (AC #GF626). This filter is a 10-micron filter with 3/8"
fittings on each end. The fuel filter should be installed between the fuel tank and the fuel rail, typically located close to the fuel tank.
Ramjet 502 Engine
TITLE
38-40 PSI (262-276 KPA)
40-42 PSI (276-290 KPA)
42-44 PSI (290-303 KPA)
IR 17FE14
88962910
PART NO.
12
54
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