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Old 04-26-2015, 04:33 PM   #1
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4.6 Build Questions

Hi All,
Let me start by saying I know Very Little about these newer motors. I have built a 5.0 push rod motor from a bare block before. I now own an 08 GT & I'm debating on building another 4.6 or doing a complete motor swap. So I'm hoping someone out there knows just how much H.P. the 4.6 Block can handle. I'd like to try to get 600-650 H.P. with 600' lbs. of Torque. My plan is to bore it .30 over, 1.7 Roller Rockers, either Super Charge, Turbo or Twin Turbo, 44-lb. injectors, Hot Rod or Thumper Cams. Not sure what else to do to reach that goal.
Any Suggestions ???? Can the Block even handle it ???
Maybe I just need to find a wrecked Z06 Vette & get the motor because that's exactly what it puts out. I'm actually wanting to build something that will beat the vette. My buddy just paid $92K for his Vette & so I want to build a motor for under $10K that will beat his Vette.

Let me know what you all think.
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Old 04-26-2015, 05:09 PM   #2
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They used to say, on here, that you need 100 more horsepower than whatever the Vette has to beat it... So you will need closer to 750 hp!
Those new Z06 are quick! 0-60 in 3.1 seconds!
Plan on spending at least double the amount that you have budgeted, to even get close to your buddy's car.
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Old 04-26-2015, 05:24 PM   #3
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There is a lot more than just making a lot of power to beat a ZO6, your going to need to make it hook up as well so I would also expect to spend part of your budget on wheels, tires, and suspension parts. I'm also guess in that your going to need more than 650 to beat the corvette. With that being said, I believe the block will hold up to 650 hp without much problem. You will need full forged internals and of course some sort of way to boost the 4.6 to over 650 hp. Another option that might be worth looking into is swapping a 5.0 coyote. I'm not very knowledgeable on this engine, but most forum members love the motor. At the end of the day your working with a 10 year old engine from a car that when brand new was less half the price of that corvette, you going to have a very difficult time beating that ZO6

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Old 04-26-2015, 05:46 PM   #4
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You won't be able to beat a C7 Z06, with a 3V with just 10 grand, you'll need a lot more $$$...


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Old 04-26-2015, 05:48 PM   #5
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I've heard 3v 4.6 holds safely 500 whp max with twin screw, seen some people saying 600 whp max with centrifugal, but I could be way off.
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Old 04-26-2015, 06:00 PM   #6
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The 100+ more hp to beat a vette is a load of crap.

Where your power band is, how long it holds it etc is what matters. Not the I have to make ××× to beat this z06 with ×××.

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Old 04-27-2015, 01:02 AM   #7
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I realize I'll have to do suspension, Clutch, gears, etc. The $10K was just a rough estimate for parts to build my current motor only. The suspension, etc. I'd do while building the motor. The car will be down for a year while I'm building the motor & it'll be easier doing the suspension while the motor is out.
I;d sure like to beat his vette...but even if I could give it a good, close run I'd be happy.
I need to find out what kind of H.P. the Coyote motor & the GT500 motor put out.
Maybe I need to go one of those routes.
I have till June to decide as we'll be moving into a new house then & soon as I'm settled in I want to get started on a build. I just figured I better start researching now so I'll have a good idea which direction I want to go with the build.
What are your opinions on Super Charger vs. Turbo or Twin Turbo ? Any up or down sides to either ? I've never used either one before. I've never done NOS before either. I've always been kind of scared to as I've seen a few guys mess their motors up with it. That was on the 5.0 push rod motors though. Not sure what they had for internals either.
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Old 04-27-2015, 06:06 PM   #8
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One of the forum members, Fabman, has a supercharged, stroked 3V that may have what it will take to bring down your buddy's Vette. His car runs low 10's.
If he doesn't chime in on this thread, maybe you should PM him and see if he will tell you what all is done to his car.
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Old 04-27-2015, 06:09 PM   #9
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One of the forum members, Fabman, has a supercharged, stroked 3V that may have what it will take to bring down your buddy's Vette. His car runs low 10's.
If he doesn't chime in on this thread, maybe you should PM him and see if he will tell you what all is done to his car.
I know he has a forged rotating assembly that is a 302.
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Old 04-27-2015, 06:10 PM   #10
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He sent me a link to what he has but I can't remember where it was.
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Old 04-27-2015, 06:20 PM   #11
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FABMAN!!!!!!!!



Maybe he will hear that...
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Old 04-27-2015, 06:25 PM   #12
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Fabman? Fabman?

Anyone? Anyone?
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Old 04-27-2015, 06:27 PM   #13
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Never around when you need him...


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Old 05-01-2015, 09:26 PM   #14
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I would've had to spend just over 10k to get 650 on my 2006 but im having other problems so im not doing it anymore but rebuild alone was just over 7k, along with turbo, 40# injectors, fuel pump, new tires and wheels, it was going to be just over 10k and that is only 650
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Old 05-02-2015, 02:44 AM   #15
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I finally found a post Fabman replied to & pm him. Hope to hear from him soon.
Can't wait to move into my new house with a garage to work in at the end of May. Living in a Condo & renting storage units to work in stinks.
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Old 05-02-2015, 02:53 AM   #16
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Hey Corey, Sounds like you were doing what I'm looking to do. So...Can I ask why you chose Turbo over Super Charger ? I'm trying to figure out the difference of what a car will do with each one. All I know is a Super Charger gives more Top End & a Turbo more bottom end.
does either one give you more of a jump off the line? I really need to understand the differences the 2 things make so I can decide which way to go.
Anyone that can tell me.....I'm listening.
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Old 05-02-2015, 02:59 AM   #17
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Quote:
Originally Posted by Hellish Horse View Post
Hey Corey, Sounds like you were doing what I'm looking to do. So...Can I ask why you chose Turbo over Super Charger ? I'm trying to figure out the difference of what a car will do with each one. All I know is a Super Charger gives more Top End & a Turbo more bottom end.
does either one give you more of a jump off the line? I really need to understand the differences the 2 things make so I can decide which way to go.
Anyone that can tell me.....I'm listening.
Turbos are more easily manipulated I know that. Superchargers you have to swap out pullies to get more boost usually
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Old 05-02-2015, 03:33 AM   #18
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Pulley's are easy to change so that's not a big deal. But does either of the 2 make your car faster than the other ? Does one make your car faster at take off & the other make your car faster down the line @ high RPM's ? I don't know if I heard that somewhere B4 or what but for some reason I keep thinking a Super Charger kicks in down the line @ higher RPM's & a Turbo is quicker off the line. It seems all the faster cars on shows like STREET OUTLAWS have Turbo's & Nitrous. I don't like the idea of a bottle of nitrous (explosive gas) sitting in my car should I wreck at some point. So I want to avoid Nitrous completely. I know, I know....the car itself has explosive gas in it. I guess it's because I kind of think of compressed gas as a bomb. Liquid Gas & I think more of fire. I stand a better chance of escaping fire than a bomb...lol.
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Old 05-02-2015, 04:35 AM   #19
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Pulley's are easy to change so that's not a big deal. But does either of the 2 make your car faster than the other ? Does one make your car faster at take off & the other make your car faster down the line @ high RPM's ? I don't know if I heard that somewhere B4 or what but for some reason I keep thinking a Super Charger kicks in down the line @ higher RPM's & a Turbo is quicker off the line. It seems all the faster cars on shows like STREET OUTLAWS have Turbo's & Nitrous. I don't like the idea of a bottle of nitrous (explosive gas) sitting in my car should I wreck at some point. So I want to avoid Nitrous completely. I know, I know....the car itself has explosive gas in it. I guess it's because I kind of think of compressed gas as a bomb. Liquid Gas & I think more of fire. I stand a better chance of escaping fire than a bomb...lol.
Well the supercharger is belt driven and the belt speeds up with rpm so I would assume turbos are more instantenous. But then there is also turbo lag so hopefully someone will come clear this up lol
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Old 05-02-2015, 10:04 AM   #20
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A supercharger will give you a more linear power band, so the power will be consistent and predictable. A turbo will typically have a jump in power, so for example a turbo will make minimal power until 2500 rpm where it will then spool up quickly and begin producing boost. A turbo charger will also have a delay in throttle response when compared to a supercharger, which is the turbo lag. Also a supercharger will require power to spin, while the turbo will not. There are also two types of superchargers, roots and centrifugal. A roots style is mounted on top of the engine, while a centrifugal is mounted on the front. I've heard that a centrifugal is basically a turbo mounted to the fan belt, so instead of having the exhaust side of the turbo, it's just belt driven.

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Old 05-02-2015, 12:13 PM   #21
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Thanks Pony, From that explanation it sounds like a Super Charger is better than a Turbo to me.
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Old 05-02-2015, 02:00 PM   #22
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A supercharger will give you a more linear power band, so the power will be consistent and predictable. A turbo will typically have a jump in power, so for example a turbo will make minimal power until 2500 rpm where it will then spool up quickly and begin producing boost. A turbo charger will also have a delay in throttle response when compared to a supercharger, which is the turbo lag. Also a supercharger will require power to spin, while the turbo will not. There are also two types of superchargers, roots and centrifugal. A roots style is mounted on top of the engine, while a centrifugal is mounted on the front. I've heard that a centrifugal is basically a turbo mounted to the fan belt, so instead of having the exhaust side of the turbo, it's just belt driven.

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as far as i know there are actually 3 types of super chargers. twin screw, roots and centrifugal.
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Old 05-02-2015, 03:50 PM   #23
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Get a twin screw

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Old 05-02-2015, 04:54 PM   #24
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I'm going to check out the 3 types & see what sounds best.
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Old 05-02-2015, 04:56 PM   #25
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Centri is basically a belt driven turbo. Their torque numbers are usually lower
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Old 05-02-2015, 05:14 PM   #26
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I think the only one I'm even a little familiar with is the Roots one.
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Old 05-02-2015, 05:16 PM   #27
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I think the only one I'm even a little familiar with is the Roots one.
Its the most traditional one in my opinion.
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Old 05-02-2015, 08:07 PM   #28
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4.6 Build Questions

It's the more common of the three; being its the least costly to purchase/install.


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Old 05-04-2015, 09:05 AM   #29
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Your pushing it with 500 hp but with that amount of hp and the right tires and suspension work you would beat the corvette. Traction is key putting the power to the pavement.

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Old 05-04-2015, 03:47 PM   #30
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Would a Coyote motor be a real pain to swap out ? There's one on C.L. for $1500 right now....however, it's all apart. I'm guessing it would be the better bet to achieve 500+ H.P. safely ? I was going to build the 4.6 anyway...so I guess it doesn't matter the 5.0 is apart as long as it's all there & looks good. But what else will I have to swap to make the coyote motor work ? Maybe the guy has those parts too & I can get a deal on everything.
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Old 05-05-2015, 07:49 AM   #31
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I believe a transmission and ECU will also be needed. I've heard that Ford made a kit for the ECU, but I've never looked into myself. I would also think that you could get the coyote to 500hp na, but it might be difficult. Idk much about the aftermarket for them, sorry. I know for sure that $1500 for a coyote is a good deal, assembled ones usually sell over $5000.

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Old 05-05-2015, 02:46 PM   #32
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I'm a little worried about buying it because the guy selling it says it really needs new cam bearings & cams & also one of the Valve covers has a pretty big crack in it. Not sure what would cause that. Cams & Bearings really no big deal unless the heads need line bored.
But the Cracked Valve Cover...what happened that caused that is my question ?
I guess I should see if the guy would be willing to meet me at a machine shop to have it Magnafluxed & checked out for Journal / bearing damage & Cylinder damage.
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Old 05-05-2015, 02:47 PM   #33
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I'm a little worried about buying it because the guy selling it says it really needs new cam bearings & cams & also one of the Valve covers has a pretty big crack in it. Not sure what would cause that. Cams & Bearings really no big deal unless the heads need line bored.
But the Cracked Valve Cover...what happened that caused that is my question ?
I guess I should see if the guy would be willing to meet me at a machine shop to have it Magnafluxed & checked out for Journal / bearing damage & Cylinder damage.
What is it out of? If out of a truck or suv the cams need to be swapped anyways
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Old 05-05-2015, 04:18 PM   #34
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Not sure...I'll have to ask.
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Old 05-05-2015, 04:39 PM   #35
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What exactly are the differences between the truck version and the coyote version?

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