Is 4.6L Superior to 5.4L
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Joined: Oct 2005
Posts: 590
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From: Palm Bay
Originally Posted by Faster150
physically the the 4.6 is stronger... and the 4.6 makes more HP per liter than the 5.4 but the 5.4 makes more torque per liter.. all physical characteristics of the engine. now if the 5.4 had better breathing heads larger valves and so forth then yeh it would be a better motor and make lots more HP. but it doesnt it uses the same heads cams and valve train as the 4.6 making the 5.4 starved more so than the 4.6 for air...
MY 5.4 HAS 2 (TWO) intake valves.. and one big exhuast valve.
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Joined: Jan 1999
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From: WINDSOR, ONTARIO, CANADA
HI!... Well the 5.4 is better than the 4.6 due to :
- forged steel crank
- 8 bolt flexplate (flywheel)
- block is thicker in main webbing and other critical areas.
- block can handle almost twice the H.P the 4.6 block can.
- Gets about the same MPG which means the 4.6 is a pig.
The reason the 5.4 gets piston slap and 4.6's get it too! Is the machining process. Ford does not use TQ plates when they bore and hone their blocks. The block should have heads studs and mains/main studs in and TQ'ed to spec, while boring and honing. My rebuilt 5.4 never had piston slap one bit.
The reason the 4.6 makes more H.P than the 5.4 per C.I is due to the MUSTANG gets the 4.6, not the 5.4. Ford will not exploit the 5.4 like they do the 4.6 due to the MUSTANG. If the MUSTANG only came with the 5.4, then the 4.6 would be gone by now or only be in granma's CROWN VIC like it belongs.
And as for the timing chain failures. I've heard of a ton of timing chain failures and they have all been on 4.6's not 5.4's. I had my timing chains checked on my over 200,000KMS 5.4 and they had only stretched 0.20 which is nothing. And I beat on that engine HARD.
Just remember FORD made the 4.6 1ST, then they made the better 5.4. Learned
from their mistakes I think they did!
If the 4.6 is so great then why did FORD decide to build a 5.4 for the FORD GT? DOH!!!!!!!!! That had to hurt!LOL!
- forged steel crank
- 8 bolt flexplate (flywheel)
- block is thicker in main webbing and other critical areas.
- block can handle almost twice the H.P the 4.6 block can.
- Gets about the same MPG which means the 4.6 is a pig.
The reason the 5.4 gets piston slap and 4.6's get it too! Is the machining process. Ford does not use TQ plates when they bore and hone their blocks. The block should have heads studs and mains/main studs in and TQ'ed to spec, while boring and honing. My rebuilt 5.4 never had piston slap one bit.
The reason the 4.6 makes more H.P than the 5.4 per C.I is due to the MUSTANG gets the 4.6, not the 5.4. Ford will not exploit the 5.4 like they do the 4.6 due to the MUSTANG. If the MUSTANG only came with the 5.4, then the 4.6 would be gone by now or only be in granma's CROWN VIC like it belongs.
And as for the timing chain failures. I've heard of a ton of timing chain failures and they have all been on 4.6's not 5.4's. I had my timing chains checked on my over 200,000KMS 5.4 and they had only stretched 0.20 which is nothing. And I beat on that engine HARD.
Just remember FORD made the 4.6 1ST, then they made the better 5.4. Learned
from their mistakes I think they did!If the 4.6 is so great then why did FORD decide to build a 5.4 for the FORD GT? DOH!!!!!!!!! That had to hurt!LOL!
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Joined: Oct 2003
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From: Texass
Originally Posted by UberDude
wait what?
MY 5.4 HAS 2 (TWO) intake valves.. and one big exhuast valve.
MY 5.4 HAS 2 (TWO) intake valves.. and one big exhuast valve.
The valves in these motors, and the 3v's, shouldn't even be called a valve. They are more like moving plugs and belong in lawn equipment, not car and truck motors.
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Joined: Oct 2005
Posts: 590
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From: Palm Bay
Originally Posted by tritonpwr
Big? BWAHAHAHA!!!! You wouldn't know a "big" valve if somebody smacked you in the face with it.
The valves in these motors, and the 3v's, shouldn't even be called a valve. They are more like moving plugs and belong in lawn equipment, not car and truck motors.
The valves in these motors, and the 3v's, shouldn't even be called a valve. They are more like moving plugs and belong in lawn equipment, not car and truck motors.
point is my 5.4 breathes better then a 4.6.
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Joined: Jan 1999
Posts: 7,030
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From: WINDSOR, ONTARIO, CANADA
HI!... Ya these mod engines have really small valves. But what do you expect from a engine that has a 3.552 cylinder bore! LOL!
I have a 1971 351-C "COBRA JET" INTERCEPTOR at home. You want to talk about valves! LOL! You can fit your fist in the intake ports!
I have a 1971 351-C "COBRA JET" INTERCEPTOR at home. You want to talk about valves! LOL! You can fit your fist in the intake ports!
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Joined: Oct 2005
Posts: 590
Likes: 2
From: Palm Bay
Originally Posted by Neal
HI!... Ya these mod engines have really small valves. But what do you expect from a engine that has a 3.552 cylinder bore! LOL!
I have a 1971 351-C "COBRA JET" INTERCEPTOR at home. You want to talk about valves! LOL! You can fit your fist in the intake ports!
I have a 1971 351-C "COBRA JET" INTERCEPTOR at home. You want to talk about valves! LOL! You can fit your fist in the intake ports!
sorry couldnt resist.
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Joined: Jan 1999
Posts: 7,030
Likes: 3
From: WINDSOR, ONTARIO, CANADA
Originally Posted by royalblue150
The 5.4 in the GT, all aluminum 4v engine, not your standard 5.4 different one. 
But it's still a 5.4 .....................................
