Fuel Rail Idea, Do You Like?

[FattyBoomBatty]

Actually, you guys sound like starquesters, who really do have fuel distribution problems. :)

[Andrew7dg]

I thought it was because of air flow as well. Wouldn't that be more of a problem then fuel?

Would buying a bigger fuel rail just solve this problem?

I suppose this become a problem when running E85 and lots of fuel

[Super Bleeder!!]

Actually, you guys sound like starquesters, who really do have fuel distribution problems. :)

TBI for the ultimate loss

[FattyBoomBatty]

TBI for the ultimate loss

No plenum to speak of, injectors before the TB, tri-y intake design. w00t. dsm people have it easy.

[Kracka]

HAHA lean cylinders from fuel distribution!
Man tooners must be busy...

So...what is the reason behind some cylinders running leaner than others?

[blageo23]

Lean=not enough fuel, no matter how you slice it.

[Shane@DBPerformance]

Airflow. It is much harder to get perfect air distribution to 4 cylinders through a throttle body, plenum, runners, intake port, past the valves, in an environment that is always changing. Versus a straight tube in which the pressure delta should always be the same, unless the fuel pump can't keep up. Even regardless of airflow, temperature can cause one cylinder like #2 to be more prone to detonation, because it is sandwiched between 2 other hot cylinders. Often with a standalone system, you might give more fuel or less timing to the center cylinders. The 03-04 Supercharged Cobra has 2 cylinders on side of the motor that are most likely to go first because of the stock cooling system.

[Shane@DBPerformance]

Lean=not enough fuel, no matter how you slice it.

Yes, but it has nothing to do with the fuel system. We met a Pro Mustang drag racer last year at PRI who was in a class that didn't allow individual cylinder trimming. He drilled holes into each intake runner and screwed bolts in and out to block airflow to cylinders that got too much air and melted shit.

[niterydr]

Thanks Shane ;).
Cooling (heat dissipation) and airflow (aka more than adjacent cylinders) are reasons why some cylinders are more prone to detonation.
Also exhaust manifold design can also play a role in detonation prone cylinders (yet again that is airflow).
Pressure drop across a fuel rail isn't going to be severe, even with garden hoses and minimal fuel pressure. Now if we low volume flow/extremely low pressures+massive injectors we could run into a starvation issue, but this isn't the case on dsm's.
Ebay owns!

[Super Bleeder!!]

Shane is so smart.

Shane for prez 08.