Horse power
06-12-2006, 10:10 PM
#1
Thread Starter
Join Date: May 2006
Posts: 5
Horse power
Hello i just bought a 2006 gt.i have been doing some reading in this forums and mags,What is the max horse power get this block get mind you that ever thing is stock.meaning just installing bolt on's like blowers etc?what i have read has been anywhere from 400 to 510.i am looking in spend some cash to get me running 12's and 11's.i am just worried about how much can the cylinder walls can handel,thx very much and i freaking love this forum Ping33
06-12-2006, 11:05 PM
#4
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Posts: 334
RE: Horse power
The block (including cylinder walls) is probably capable of at least 600 – 700 horsepower if not a bit more. It is the internals, specifically the rods, which are the weak link. From my understanding on the 4.6 when you start getting in the neighborhood of 400hp plus at the rear wheels you need to seriously start thinking forged internals…
06-12-2006, 11:14 PM
#5
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Join Date: Apr 2006
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Posts: 308
RE: Horse power
+1
it is the internals (pistons, rods, etc.) that are the weak link. ford used a cheaper manufacturing process to keep the cost down. strengthen those if you're going above 450. ask anyone pushing 450 or more, and they'll tell you its not IF the engine goes, its WHEN will the engine go. not saying you cant do it, or for what duration. but if you do, dont be to hurt when it blows up in your face. and those are RWHP #'s.
it is the internals (pistons, rods, etc.) that are the weak link. ford used a cheaper manufacturing process to keep the cost down. strengthen those if you're going above 450. ask anyone pushing 450 or more, and they'll tell you its not IF the engine goes, its WHEN will the engine go. not saying you cant do it, or for what duration. but if you do, dont be to hurt when it blows up in your face. and those are RWHP #'s.
06-12-2006, 11:47 PM
#6
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Join Date: Mar 2006
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Posts: 3,758
RE: Horse power
the rods are the first weak link you will encounter from what everyone has inputed to date. if you are planning on 450rwhp or more, just build the bottom end up and lower compression a little bit
06-13-2006, 01:24 AM
#7
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Posts: 3,235
RE: Horse power
Man I don't know why people keep saying that Ford used a cheaper process for the internals. They moved the ring closer to the top of the piston so they could make emissions better after increasing horsepower, using forged internals does not make it that easy to keep cost down AND make the emissions this car has had to pass. People talk as if this motor is weak, the 5.0 even the stock forged 5.0 isn't capable of reliable 500hp without something being done to it and yet people keep spouting off how weak these motors are.... 
To me, 450hp with a box stock bottom end is pretty damn good, want more, shell out the coin to do so but don't expect Ford to build you a bullit proof bottom end unless you want cardboard for an interior and no paint on the car....
To me, 450hp with a box stock bottom end is pretty damn good, want more, shell out the coin to do so but don't expect Ford to build you a bullit proof bottom end unless you want cardboard for an interior and no paint on the car....
06-13-2006, 03:13 AM
#8
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Join Date: Mar 2005
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Posts: 864
RE: Horse power
^^^ I am in complete agreement with what viking 396 said. Any time you can add 150 hp to any engine and still keep reliability is impressive. When you consider that these egines have 300 hp from the factory it is very impressive that they can take an aditional 150 HP with no problems. I could come up with a long list of engines that could NOT hold together with similar percentages of increase over stock. In my opinion these engines have no "weak spots" and props to Ford for biulding that much extra strength into the engine and keep the price of the car resonable.
The other thing people don't seem to consider is that putting a super charger on something with 9.8 - 1 compression is going to biuld a tremendous amount of cylinder pressure, especially with a stock short duration cam. Now I am dating myself but years ago anyone buillding an engine for use with a blower rarely used anything over 8.5 - 1. Many were as low as 7.5 - 1 and they ran forged pistons and steel cranks with a long duration cam and then and ONLY then did they run a lot of boost. Frankly I am suprised these engines hold up as well as they do with the boost some people are running.
Also viking396 is correct about the top ring land being located high on the pistion for emsions reasons. I have been messing with cars for over 25 years and built quite a few engines but I could NOT get 300 hp from a 281 cubic inch motor AND get it to meet modern emissions requirments. I think Ford did an excelent job.
The other thing people don't seem to consider is that putting a super charger on something with 9.8 - 1 compression is going to biuld a tremendous amount of cylinder pressure, especially with a stock short duration cam. Now I am dating myself but years ago anyone buillding an engine for use with a blower rarely used anything over 8.5 - 1. Many were as low as 7.5 - 1 and they ran forged pistons and steel cranks with a long duration cam and then and ONLY then did they run a lot of boost. Frankly I am suprised these engines hold up as well as they do with the boost some people are running.
Also viking396 is correct about the top ring land being located high on the pistion for emsions reasons. I have been messing with cars for over 25 years and built quite a few engines but I could NOT get 300 hp from a 281 cubic inch motor AND get it to meet modern emissions requirments. I think Ford did an excelent job.
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