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Originally Posted by backyard_mech420
I am aware of the differences between the 5.0 & the 4.6,and how much quieter the 4.6 is,which it should be.I have no experience with the 4.6,the injectors may be totally different,But it seems to me if you can hear your injectors clicking at idle,eather something is wrong or the 4.6 is too weak to mask the sound of them.My '87 is MPFI(Multi Port Fuel Injection),and I have a Raidiator with Dual Electric Fans.I removed my mechanical fan beforehand and installed all new performance pulleys.The entire setup runs very quiet at idle,all you can hear is the low rumble of a Turbocharged 5.0 coming out of dual flowmasters,and under load all I can hear is pure performance.  |
The injector ticking is a very low volume noise but is audible. Perhaps the 4.6 uses a different type of injector than your "87. All they are is an electromagnetically actuated solenoid valve, albeit a very high speed one. when energized the valve snaps open - when deenergized the valve snaps closed. This snap is the light click that you hear. I have never heard that a quiet (in the engine compartment) is a sign of weakness. Perhaps if our poster had Flowmasters rumbling, he would not hear the clicking. When Ford introduced the Modular V-8, in dyno testing running a durability test akin to running up Pikes peak at full throttle, the stock 4.6 surpasssed the stock 5.0 by a factor of 2.5. Ask any limo company. In another forum I was on A limo company said they average 750 thousand miles before retirement on the 4.6's, and have exceeded one million on some. I don't think they are an inherently weak motor.