Why a 2V motor?

[Bronco75]

Sorry if this is a repost...I did a quick glance and didn't see anything on the topic.

Why did Ford decide to go with a 2 Valve motor over a 4 Valve motor? I was sitting around shooting the shit with my Mustang buddies and we got on the topic and just could not come up with a logical reason why Ford would choose to do this. The early 2000's SVT Cobras were 4v...the Shelby 500 is a 4v. However, the Lightning was a 2v also.

I figured you guys would have some great input and ammo for me to use against these guys =)

 

[pirate air]

Cost and although it could benefit from a 4v with 411hp and 434tq is it really missing them? With the large bore you get away with running two large valves without shrouding issues.

 

[Nv Guy]

What pirate said. It produces sufficient HP as it is. It was designed to be truck motor, so spending the money to get top level efficiency out of it wasn't a big priority.
Look at it this way, would you be able to hit any harder if your sledge hammer was aerodynamic?
Probably not.

 

[Raptor911]

Also .. 4v motors tend to be needed in high revving motors (smaller displacement engines where you want to squeeze out every ounce of HP). Truck motors (bigger displacement) don't rev too high.

 

[SVT_4X4]

Plus this motor is older technology from Ford that originally was shelved, but then brought back to replace the V10. I would imagine they used most of what they already had developed.

 

[FilthyRaptor]

valve and head design is a topic of great debate/myth/ignorance/science and art in racing. Generally speaking, the bigger and fewer the valves the less duration/lift you can experience given the same rpm with more and smaller valves.

No doubt less moving parts = less opportunity for problems. Flow in some cases in motorcycle motors was better with 2 valves than 3 4 or 5 that other manufactures were trying.


I have faith in the raptor 6.2 design. not a fan boy or care for more performance than what it delivers, just more mpg which is mainly tires and aero

 

[wanderfalk]

the more common use of the 6.2

is in the f250 ,putting a 4v unit in there mades less sense

 

[ARH1956]

Here's my opinion in a response from a previous thread;

Here's my take on the 6.2. The Raptor is marketed as a desert racer to be sold to the general public. The expectation is that a higher percentage of it's buyers will engage in high speed off-road use than with any other FOMOCO truck, ever. With this target in mind Ford designed a new engine architecture based loosely on the modular V-8 with durability as top priority, not achieving the maximum specific output per CI. Will an aluminum block DOHC 6.2 be offered as an option in future Raptors? Possibly. Will the added mechanical complexity make it a more "advanced" engine, not especially. Will it be more durable or reliable for Raptor owners, doubtful. Unlike guys driving actual trophy trucks where motors are built for maximum output I, and most Raptor owners don't have a full support team to follow my every move, nor the desire or resources to rebuild the motor every 2-3K miles. I understand your position and a part of me would like to have an aluminum block DOHC 6.2 right now, not because it would be more advanced but because you can never have too much HP, LOL. BTW, I love the Coyote 5.0 as well as the 3.5 EcoBoost, both are amazing engines I simply prefer the 6.2 in the Raptor. Ford has truly got it's act together across the board when it comes to truck power plants. Well done FOMOCO and SVT!

 

[m3dragon]

DOC engine though would be more efficient. Look at AMG motors

 

[Jordan@Apollo-Optics]

Why didn't they do it? Because it's an F250 motor that they already had so to keep costs down for R&D, they slapped in the 6.2 and called it a day. Sure, a DOHC would be more efficient, but generally DOHC engines produces peak TQ and HP had higher RPM levels and to get the most out of them, you have to spin them higher. The Raptor is a truck and being that it's designed on an F150 platform, and knowing their audience will also include guys who just like the look and never take it offroad, they needed it to be reliable as hell and also still able to tow without breaking. Higher RPM's adds more stress to the engine. Now throw and extra 5,000lbs of dead weight behind you and pushing the RPM's to 7K or 8K becomes less and less reliable. Ford knows how to build a truck motor and they stuck with what works instead of trying something new, having major issues with it, and losing their ass on the Raptor. Instead, they've had more success than they could of dreamed of and they were able to keep some of the R&D costs down by utilizing parts they already had on their shelves.

Edit: Apparently the 6.2L was in the Raptor before the F250. But they also had it laying around as an old Boss block from what another user says. So the gist of the message is still the same. Use an engine/block they already had to keep their R&D costs down and use that money on making the suspension as badass as it is.