Built 2v vs 4v

banned · September 14th, 2007, 11:13 PM

This is the question of the day

.... everyday

anyway (no pun intended) I would like to hear opinions and any numbers if available to weigh the pros and cons of a built 4v vs built 2v in a turbo charged application... what are the limits of each? are there any real differences that can be solved with a few more pounds of boost?

Consider A HCI 2v, stage 3 heads and blower cam vs pretty much stock 4v heads with new springs and valves
Forged everything on both accounts - so they both can spin 8k rpm, and lets say the power goal is 700 rwhp on BOTH cars, so BOTH cars are tuned to 700 rwhp... i dont know what the torque differences would be if any (you can explain your theory)

Now also consider this question will all else being equal - both cars running t-56's or what have you, both cars with 3.73 gears, same suspensions - only difference being the motor type 4v vs 2v... what is the outcome?
4V>2v?
2v>4v?
Drivers race?

please discuss

HMUSN · September 14th, 2007, 11:14 PM

the 4v will always make more power mod for mod.

it is as simple as that

banned · September 14th, 2007, 11:18 PM

thats not the question

Drgnracin72 · September 14th, 2007, 11:56 PM

i will say the 4v becasue its got a different power band and where it makes power. its gets more air sooner therefor should make pwoer sooner. so if all else being equal, the 4v should win simply becasue of the way and rpm the power is made. more air equals better power

banned · September 15th, 2007, 01:04 AM

im not so shure... do you have an number as to flow rates for a stage 3 2v head vs a stock 4v head?

Drgnracin72 · September 15th, 2007, 01:06 AM

i dont, but the stage 3 2v head isnt going to flow the amount the stock 4v head will.

banned · September 15th, 2007, 01:08 AM

ok the stage 3 2v flows 225 cfm
a stock 4v flows about 240-250 cfm
a stage 3 4v flows 308 cfm

Drgnracin72 · September 15th, 2007, 01:09 AM

gonna have more low end than the 2v, i sitll say that the 4v is going to win just because the way they make power and when they start making power

banned · September 15th, 2007, 01:24 AM

i think compared to stock it will be quiet close, with the cobra squeekin ahead, but once you mod those bad boys, i think the comparision is over. I mean in the 1/4 its gonna be a drivers race for sure but on highway rolls i think your right, the 2v is toast

03_StangGuy · September 15th, 2007, 01:29 AM

this is interestin, i would think that you could get the 4v to those power levels wit less work. How much does a stage 3 valve job run? It would prolly be more cost effective to use a 4v. You can get anythin you want from either its just how much do you want to spend!

September 14th, 2007, 11:13 PM	#1
banned Regular Join Date: May 2007 Posts: 462 iTrader: 0 reviews	Built 2v vs 4v This is the question of the day .... everyday anyway (no pun intended) I would like to hear opinions and any numbers if available to weigh the pros and cons of a built 4v vs built 2v in a turbo charged application... what are the limits of each? are there any real differences that can be solved with a few more pounds of boost? Consider A HCI 2v, stage 3 heads and blower cam vs pretty much stock 4v heads with new springs and valves Forged everything on both accounts - so they both can spin 8k rpm, and lets say the power goal is 700 rwhp on BOTH cars, so BOTH cars are tuned to 700 rwhp... i dont know what the torque differences would be if any (you can explain your theory) Now also consider this question will all else being equal - both cars running t-56's or what have you, both cars with 3.73 gears, same suspensions - only difference being the motor type 4v vs 2v... what is the outcome? 4V>2v? 2v>4v? Drivers race? please discuss

September 14th, 2007, 11:14 PM	#2
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	the 4v will always make more power mod for mod. it is as simple as that __________________

September 14th, 2007, 11:18 PM	#3
banned Regular Join Date: May 2007 Posts: 462 iTrader: 0 reviews	thats not the question __________________ Considering selling my car to fund my race car: take a look and tell me what you think. http://www.moddedmustangs.com/forums...ml#post1041280

September 14th, 2007, 11:56 PM	#4
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,638 iTrader: 2 reviews	i will say the 4v becasue its got a different power band and where it makes power. its gets more air sooner therefor should make pwoer sooner. so if all else being equal, the 4v should win simply becasue of the way and rpm the power is made. more air equals better power __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 15th, 2007, 01:04 AM	#5
banned Regular Join Date: May 2007 Posts: 462 iTrader: 0 reviews	im not so shure... do you have an number as to flow rates for a stage 3 2v head vs a stock 4v head? __________________ Considering selling my car to fund my race car: take a look and tell me what you think. http://www.moddedmustangs.com/forums...ml#post1041280

September 15th, 2007, 01:06 AM	#6
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,638 iTrader: 2 reviews	i dont, but the stage 3 2v head isnt going to flow the amount the stock 4v head will. __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 15th, 2007, 01:08 AM	#7
banned Regular Join Date: May 2007 Posts: 462 iTrader: 0 reviews	ok the stage 3 2v flows 225 cfm a stock 4v flows about 240-250 cfm a stage 3 4v flows 308 cfm __________________ Considering selling my car to fund my race car: take a look and tell me what you think. http://www.moddedmustangs.com/forums...ml#post1041280

September 15th, 2007, 01:09 AM	#8
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,638 iTrader: 2 reviews	gonna have more low end than the 2v, i sitll say that the 4v is going to win just because the way they make power and when they start making power __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

September 15th, 2007, 01:24 AM	#9
banned Regular Join Date: May 2007 Posts: 462 iTrader: 0 reviews	i think compared to stock it will be quiet close, with the cobra squeekin ahead, but once you mod those bad boys, i think the comparision is over. I mean in the 1/4 its gonna be a drivers race for sure but on highway rolls i think your right, the 2v is toast __________________ Considering selling my car to fund my race car: take a look and tell me what you think. http://www.moddedmustangs.com/forums...ml#post1041280

September 15th, 2007, 01:29 AM	#10
03_StangGuy I Post Entirely Way Too Much Blown 03 GT Join Date: Jun 2007 Location: Long Island NY Posts: 6,238 iTrader: 0 reviews	this is interestin, i would think that you could get the 4v to those power levels wit less work. How much does a stage 3 valve job run? It would prolly be more cost effective to use a 4v. You can get anythin you want from either its just how much do you want to spend! __________________

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