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M-6007-XEFMS
340 HP Crate Engine
GUIDE
NO PART OF THIS DOCUMENT MAY BE REPRODUCED WITHOUT PRIOR AGREEMENT AND WRITTEN PERMISSION OF
FORD RACING PERFORMANCE PARTS.
IS-1850-0179
Page 4 of 13
Techline 1-800-367-3788
Factory Ford shop manuals are available from Helm Publications, 1-800-782-4356
Aviation fuel is lighter and will require richening an engine in relationship to its requirement with "pump gas." We
have found in the dyno testing of our crate engines that 1 point richer on air/fuel ratio equals only a few percent less
power. Running an engine as lean as possible produces the best power but also increases combustion
temperatures and the chances of engine damage.
COMMON PROBLEMS WITH FUEL DELIVERY SYSTEMS
Do not mount an EFI electric fuel pump so it has to draw fuel from the tank. This creates a negative pressure in the
fuel line allowing the fuel to boil at a lower temperature.
The pump must be mounted in the tank or in a location so that it is gravity fed.
If the fuel rail is too small and you have large injectors, this can create a pulse in the fuel rail allowing fuel starvation
on some cylinders.
Fuel should be pushed through the fuel filter. Pulling fuel through a filter can cause cavitation. If a filter is to be used
on the inlet of a rail-mounted fuel pump, a filter rating of 160 microns MINIMUM should be used.
It takes approximately ½ lb of gasoline to support 1 hp. This is commonly referred to as a .5 BSFC. You should
always err in the safe direction of larger when sizing your injectors and fuel pump.
COOLING SYSTEM CONSIDERATIONS/COMMON PROBLEMS
Higher horsepower requires more cooling capacity.
When the fill point of the cooling system is not the highest point, air pockets are created. The air pockets then
create hot spots, and the hot spots promote improper combustion, which can cause engine failure.
Improper pulley size makes the fan and water pump turn too slow or too fast. Production water pumps are normally
run at 20% over engine speed and do not perform well over 5000 engine rpm. Underdrive pulleys generally reduce
water pump speed to 85% of engine rpm and may not provide enough water flow to cool the engine.
The radiator must have enough area to dissipate the heat being generated by the engine.
If the fan size is too small, it will not move enough air across the radiator so it can properly dissipate the heat being
generated. Fan shrouds increase the effectiveness of the fan significantly.
Radiator location can affect airflow through the radiator at different vehicle speeds.
FLYWHEEL, CONVERTER, AND TRANSMISSION PROBLEMS
Installing the wrong flywheel for the balance factor of the engine will cause vibration and eventually damage
the engine.
Wrong length input shaft or "stack up height" can force the crank forward and damage the engine thrust bearing.