Wiring and plumbing a drag car or fuel altered
Posted 17 April 2007 - 10:15 AM
Posted 17 April 2007 - 04:52 PM
Hi gang. I'm trying to put together an early 60's style fuel altered but I'm having a hard time finding photos or articles that show how to plumb and wire the car. I want help setting up the fuel lines especially. Any suggestions?
Blown or injected???
which engine fuel Pump etc..
Posted 17 April 2007 - 06:21 PM
Posted 18 April 2007 - 05:53 AM
The basics are the same for all engines, street, drag or whatever. But the hardware can vary widely due to equipment used.
Fuel is pumped one direction into the engine. Sometimes there are two lines (A). In those cases, one is usually the return line. Fuel is under pressure at all times but that varies when the engine rpm's change. In order to maintain that pressure a valve is installed that maintains a consistent volume and bleeds off the excess which returns to the pump or to the tank. This is also why there may be two lines between the tank and the pump.
To meter the fuel/air for throttle control, a fuel block with a metering valve ( is attached to the side of the "Hat/scoop" and controlled by adjustable control rods (E). As the butterflies open and close with the throttle the fuel valve is opened and closed like a water faucet.
The metered fuel is distributed to the injectors via rubber or aircraft hoses. Most 60's dragsters used rubber hoses or steel lines. The aircraft hoses that are so commonplace now, were very expensive having been developed for the Apollo space program had not yet been adopted by the sport until the later 70's. There are two hoses © generally, because injectors can be located above and below the blower. If only one set of injectors are used under the scoop then there would be only one hose between the metering block and the distribution block.
At the back of the blower is located one or two distribution blocks (D) where the fuel is broken up into individual lines for each injector. Some systems use only 4 and some as many as 16 injectors!
Some systems have these pieces located in different positions but the basics are the same.
The illustration shown is the pretty much the basic AMT or Revell blown funny car or dragster Hemi engine.