5.4 3v motors
12-10-2014, 06:29 PM
#2
Senior Member
By "internals" which parts are you referring to?
12-10-2014, 07:41 PM
#3
12 Second Truck
Only the crank is forged. Good to about 1000hp. The rods are powdered and pistons are hypereutectic.
Manley makes forged h beam and i beam rods and forged pistons.
Manley makes forged h beam and i beam rods and forged pistons.
Last edited by Blown Ford; 12-10-2014 at 07:43 PM.
12-11-2014, 11:40 AM
#5
12 Second Truck
You can run more boost but will need better then 93octane. I run Torco in my fuel to make it 102 octane when I race and pulley for 13psi. This works well and allows timing to peak at 17.75 degrees. On the street running 11psi with 93 octane timing stays in the low teens. (Explanation below). My tune commands an Air/Fuel ratio of 11.22 at wide open throttle race or street. This keeps things safe.
A little more about timing. Our stock compression ratio is 9.8:1. With 11psi and an air/fuel ratio of 11.22 my combined compression ratio is 13.79. The max recommended compression ratio on 93 oct fuel is 12:1. As you can see I'm exceeding that already. So timing is retarded under wide open throttle to compensate. And the knock sensors have the ability to pull as much timing as needed to prevent knock.
Quick note from what I've seen and experienced with these trucks and the fuel system limits is:
Eaton roots blowers (Roush, Magnasun) good on stock fuel pump and injectors (38lb) supplied with kit to a max of 10psi. Though some have put the fuel pump at 80% duty cycle at just 8psi.
Twinscrew blowers (Whipple, Saleen, Kenne Bell) good on stock fuel pump to a max of 12psi. Whipple actually states this in their manual. Injector upgrade is required though.
I recommend 47lb or 60lb injectors as an upgrade.
Last edited by Blown Ford; 12-11-2014 at 11:43 AM.
12-11-2014, 03:03 PM
#6
Ford Enthusiast
Thread Starter
They seem to hold up fine with 12psi. Of course I've seen some blow up at 10psi. It really comes down to fuel supply and detonation better known as spark knock. The engine will not tolerate a lean condition or spark knock. The motors that have blown have been due to a lean condition causing spark knock. Either running out of fuel pump or running out of injector. So you have to watch duty cycle on the pump and injectors when tuning. Duty cycle should never exceed 80%. Limit shifts to a max of 5300rpm. You can run more boost but will need better then 93octane. I run Torco in my fuel to make it 102 octane when I race and pulley for 13psi. This works well and allows timing to peak at 17.75 degrees. On the street running 11psi with 93 octane timing stays in the low teens. (Explanation below). My tune commands an Air/Fuel ratio of 11.22 at wide open throttle race or street. This keeps things safe. A little more about timing. Our stock compression ratio is 9.8:1. With 11psi and an air/fuel ratio of 11.22 my combined compression ratio is 13.79. The max recommended compression ratio on 93 oct fuel is 12:1. As you can see I'm exceeding that already. So timing is retarded under wide open throttle to compensate. And the knock sensors have the ability to pull as much timing as needed to prevent knock. Quick note from what I've seen and experienced with these trucks and the fuel system limits is: Eaton roots blowers (Roush, Magnasun) good on stock fuel pump and injectors (38lb) supplied with kit to a max of 10psi. Though some have put the fuel pump at 80% duty cycle at just 8psi. Twinscrew blowers (Whipple, Saleen, Kenne Bell) good on stock fuel pump to a max of 12psi. Whipple actually states this in their manual. Injector upgrade is required though. I recommend 47lb or 60lb injectors as an upgrade.
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12-13-2014, 02:35 AM
#8
Ford Enthusiast
Thread Starter