hondarocks61
Active Member
Thank you! This info was very useful to me! I Was thinking about going old school on my fathers f-150.
Sent from my LGL22C using Tapatalk
2v quest for power
- Thread starter punched281
- Start date
Sent from my LGL22C using Tapatalk
punched281
Active Member
Well, my wife and I got a new daily to replace the BMW...
Isn't there another certain member who likes turbo Stangs and Pontiac gt's?!?? Lol
Those are awesome cars!!!
This message courtesy of crapatalk!
Those are awesome cars!!!
This message courtesy of crapatalk!
punched281
Active Member
Haha love the car! Yes I believe there is... His stuff is a little more serious than mine haha.
Been crappy weather lately, but took 2 mains out and waiting to see how she accelerates. Got a tach that I need to wire and mount up.
As for the g8, going to get HP tuners on it and get the tune crisp. Then exhaust and intake and call it good for a while.
A slow merge over is how I see it!
Im gonna go ahead and say my goodbyes.
Welp...its been nice chatting modulars with ya. ...lol
Im gonna go ahead and say my goodbyes.
Welp...its been nice chatting modulars with ya. ...lol
punched281
Active Member
Haha it's not a merge. Just a larger scope. I don't care what it is honestly. Except Subaru's, not in to them at all. But mustangs will always be my favorite.
I haven't even driven the mustang a ton and I'm slightly thinking about a 4v for the next motor. But that's not till this little 2v proves itself.
Let me sway you away from the 4v!
punched281
Active Member
On a serious note, I want to hear your opinion on them. These are my thoughts on why I didn't do a 4v in the first place. EXPENSIVE. There are double of everything. So far I am happy with the 2v. We will see how she puts the power out when the auto goes in.
You nailed most of the thoughts. Double headache!
The 2v head design far exceeds most 4v head design in terms of port angle relative to the valve angle all relative to the bore axis. 4v Tumble in cylinder motion does not compare to 2v swirl in cylinder motion (like a cup of liquid stirred, step back and watch how long the motion will last). In other words, most 4v heads dont offer the best in cylinder motion. Now the aviator, 04cobra, or fr500 4v heads....change the game. And how to look at this? Ill try to explain. The early production C 4v heads had ports that create a high tumble. These port laid nearly perpendicular to the bore. (all 4v heads produce tumble motion...like water pouring into a glass cup and 2v heads produce swirl....like a vortex tornado stirred in the cup) As the piston draws incoming rush mixture, a high tumble head will produce very strong tight tumbles directly after the valve that rampantly will slow down following the piston as it reaches the bottom(the motion at the bottom is slower than the tail end rush thats at the top). This is mostly due to the tumble being non-axial to the bore and the tumble itself is really tight staying at the top.....perfect for emissions!
The better 4v heads ports are raised angling the rush toward the bottom of the bore creating big tumbles that completely cover the depth of the cylinder. This improves the mixture greatly, even though the mixture technically is slow....its more uniformed.
2v regardless of port shape creates an axial motion to the bore. We will call it swirl. Their are a few controlled patterns of swirl, but we wont go into that. Lets just call it swirl. Take the glass of water, stir it real good, step back and time the motion. Its movement is axial to the bore with no complications to move like tumble would be.
This is why direct injection was soooo needed. No port and valve wash down and the direct injection itself creates mixture with in the bore keeping the mix moving while piston nears the bottom.
The 2v head design far exceeds most 4v head design in terms of port angle relative to the valve angle all relative to the bore axis. 4v Tumble in cylinder motion does not compare to 2v swirl in cylinder motion (like a cup of liquid stirred, step back and watch how long the motion will last). In other words, most 4v heads dont offer the best in cylinder motion. Now the aviator, 04cobra, or fr500 4v heads....change the game. And how to look at this? Ill try to explain. The early production C 4v heads had ports that create a high tumble. These port laid nearly perpendicular to the bore. (all 4v heads produce tumble motion...like water pouring into a glass cup and 2v heads produce swirl....like a vortex tornado stirred in the cup) As the piston draws incoming rush mixture, a high tumble head will produce very strong tight tumbles directly after the valve that rampantly will slow down following the piston as it reaches the bottom(the motion at the bottom is slower than the tail end rush thats at the top). This is mostly due to the tumble being non-axial to the bore and the tumble itself is really tight staying at the top.....perfect for emissions!
The better 4v heads ports are raised angling the rush toward the bottom of the bore creating big tumbles that completely cover the depth of the cylinder. This improves the mixture greatly, even though the mixture technically is slow....its more uniformed.
2v regardless of port shape creates an axial motion to the bore. We will call it swirl. Their are a few controlled patterns of swirl, but we wont go into that. Lets just call it swirl. Take the glass of water, stir it real good, step back and time the motion. Its movement is axial to the bore with no complications to move like tumble would be.
This is why direct injection was soooo needed. No port and valve wash down and the direct injection itself creates mixture with in the bore keeping the mix moving while piston nears the bottom.
punched281
Active Member
Interesting, so the 4v pretty much creates a little more chaos in the combustion chamber. Makes sense and is very interesting that those details can change everything greatly.
So it would be worth the investment of professional ported and built 2v heads...
So it would be worth the investment of professional ported and built 2v heads...
DropTopPony
Post Whore
Or just buy a set of Trick Flow 2V heads.
Yes and that chaos is very unorganized, allowing for unstable combustion compared to 2v extremely stable combustion.
punched281
Active Member
I would love to, but don't think I could swing that money on heads. Maybe some day.
I just learned a nice lesson!
I took the car out last night. I think my rich acceleration is in the transition circuit since my mains didn't do anything. Aand still can't seem to get the idle perfect yet. It also won't spoolpre than 9 pounds so I have a few thing tp figure out.
I think brakes are next on this pig, definitely going to need them before I go to the track.
DropTopPony
Post Whore
You are going to spend close to that for a set of nice P&P'd heads anyway.
My PI's were done by Fox Lake and they were $2000 when I bought them. My Trick Flow Track Heat were $2050. Now the TF's didn't exist when I bought my Fox Lake PI's so they were the best you could buy at the time.
You could always buy some used worked over heads and save some coin.
punched281
Active Member
Yea I will cruise for some used one. But I'll only do that when I know for sure the heads are choking it out. Right now I still have to get the carb dialed in and put the an auto in there too
punched281
Active Member
Going to head to the track on Thursday. Confident enough to run the mustang a few times. Idle needs help but everything has been solid. Put a bigger wastegate spring in and going to try for 12 psi at the track. Don't think the clutch will handle much more.
So why are your guesses ? Tranny shifts terribly, but other than that should be good.
I'm guessing 13.01 @ 115 haha
So why are your guesses ? Tranny shifts terribly, but other than that should be good.
I'm guessing 13.01 @ 115 haha
punched281
Active Member
Well messed with the carb a little. Got it a little closer but it's leaking oil really badly so going to skip the track with the mustang but going to run the g8!
punched281
Active Member
So after the let down test drive, I thought maybe I would settle and get a stock 4r70. I priced things out and would end up about 1k into it. Ironically I found a built 4r with converter, mvb and transbrake. Comes with some other random stuff but going to go pick it up next Tuesday.
punched281
Active Member
Got the tranny back home and ordered a tci shifter for it. Pretty stoked to get it in. Going to try and get it done for a track day in 2 weeks.
Anyone want to do a run down on the wiring for a mvb? It's. PA valve body with a brake.
Anyone want to do a run down on the wiring for a mvb? It's. PA valve body with a brake.
Milehigh JDF
Member
Planning on running at Bandimere or PPIR? I ran a 13.1 @ 110 with an awful 60' in mine so I don't see how you couldn't knock down a faster time.
Similar threads
