Tunnelwedge preference

[FElony]

That engine is mighty impressive, for sure. To be clear, when I said "Turbo?" it was just a callout for opinions on using the BBM with said boost, at which point the overly large port flow characteristics go out the window.

[cammerfe]

I think you put your finger right on it. With TB EFI, equal flow is the ruler. Put boost to it and you have a whole 'nother ball-game.

KS

[MeanMofakee]

In regards to using a tunnel wedge intake of any brand, set up with port injection and throttle bodies, is there the ability to tune out some of the driveability concerns and loss of torque vs a dual plane?

[scott foxwell]

That engine is mighty impressive, for sure. To be clear, when I said "Turbo?" it was just a callout for opinions on using the BBM with said boost, at which point the overly large port flow characteristics go out the window.

They don't completely go out the window, but forced induction does cover a multitude of sins. Forced induction still has to obey the same laws of physics that NA does and keeping ports and valves properly sized is still important. Velocity still matters for cylinder filling. FI doesn't increase CFM like most think; the power increase comes from an increase in air-fuel density, not an increase in mass air flow. Remember...boost is just a measurement of restriction.

[jayb]

In regards to using a tunnel wedge intake of any brand, set up with port injection and throttle bodies, is there the ability to tune out some of the driveability concerns and loss of torque vs a dual plane?

If you have a good, fully tunable EFI system, you can certainly tune out the driveability concerns.  But I'm not sure you can do anything about the limited torque that can be caused by large runners; you need good port velocity to make torque at lower engine speeds, and a runner with large cross sectional area is going to tend to have lower velocity. 

Of course, if you have a lot of cubes you automatically make more torque for any given induction system, so you may not notice the lower torque from a big intake on the street.

[cammerfe]

Quote---...boost is just a measurement of restriction.

The measurement is just a number used for comparison purposes, and doesn't take into account where the restriction is. In a particularly wide-open intake tract, the resistance (restriction) might well be the piston crown.

But we are talking about what's happening---in the vernacular, we're crammin' more air into the cylinder while the valve is open. If there were no other factors to be considered, the more the hole is open, the better. But particularly, considering the 'demand' component we have to deal with---the fact that unless we are 'in boost' we have, in effect, an NA engine, all the other factors come back into play.

Let's not forget that it's 'more air' that we're looking for, and let's not get hung up on how we measure it.

KS

[FElony]

Quote---...boost is just a measurement of restriction.
{snip}
Let's not forget that it's 'more air' that we're looking for, and let's not get hung up on how we measure it.

KS

Right. I think the factor here is the potential of the combo. A BBM T-Wedge on TFS heads has got to make more power, earlier, with less boost than an original Ford T-Wedge on, say, Edelbrock heads, given the same adequately-sized turbo on both.

[ron b]

I am looking for a original or dove. any for sale?  thanks ron  ronbidstrup@sbcglobal.net

[jayb]

Try putting a want ad in the classifieds, Ron.  They are out there...

[ron b]

sorry about that,  will do