Snoopysvet

Curious about this intake, would this work well for a stock sbc since it is geared towards low end power. More interested in the physics rather than replacing mine, interesting concept.

cv67

Always curious about their theory too would love to see some testing on them neat pieces. They are around you just never hear about them much.

Had an extrude honed Port O Sonic on a 460stang it made great torque everywhere and pulled that big block hard til the cam pooped out. Was like the perfect balance between a DP and single. Nice piece I thought.

69427

I thought that was a neat concept back in the day, and always wondered why it wasn't more popular (assuming it wasn't due to price). The small primary passage should help low end response and drivability. The only technical thing that I was curious about was if the high RPM performance suffered due to the loss of port volume and any wall friction issues (eight walls vs four per cylinder) slowing up the flow.

Snoopysvet

When the secodaries are opened would the venturi effect from the primary port "pull" the flow from the secondary port resulting in great midrange torque?

Ganey

In a large manifold test on a mild 350 w/ Comp 252H the Dual Port was generally similar to stock iron intake though lower at most points in the 3000-5000rpm test. Even at 3000 rpm 4 hp less than stock. Weiand Action+, Performer 2101 & others did much better.

427Hotrod

It was an interesting idea that didn't work out. Think about what happens to all that nice airspeed when it exits that little runner and then enters a great big port. Plus you give up port volume with the divider. Might work Ok on an extremely low RPM deal (like 2000 rpm) but would still have all the inherent mixture issues.

I'd use a stock iron intake before I bolted one on today.

I will say that I used one back in high school on my Pinto. I took the stock 2bbl off and installed the Offy and the 390 cfm Holley 4bbl that was recommended as a package. I'll just say the 2bbl Holley/Weber and stock intake would walk away from the 4bbl setup everywhere. It ran 14.60's at the time which was flying in the 70's for a N/A four banger! Spanked many a Trans Am and Z-28 from the late 70's!

JIM

roscobbc

Sorry - off topic a bit, but-

Jim - back about that time over here in the UK (and close to Ford's UK one time manufacturing plant nearby at Dagenham) there was a local gut who ran a red Ford Cortina on the strip (he owned a newsagents and named the car Newsboy or something similar) The Cortina was the UK's equivalent to the Pinto with a 2 litre instead of 2.3 litre OHC four banger. This car had quite a few mods and a brace of Weber side draughts - this too would 'spank' many a 'muscle' car on the strip!

427Hotrod

We'll digress for a minute.....but yes...mine was a 2.0 also. Head milled .070", Melling cam, header and 4.11 gears with little B-50x13 22" tall tires. Had to launch hard to keep tires spinning or the little motor would have a hard time pulling back. Shifted at 7500 RPM and it was a blast! BTW...I still have it...waiting for time to mess with it someday!

Back to OP....there were some other intake designs that DID work. Like when Edelbock made the big block tunnel rams with two different sized ports to compliment the *good and bad* ports of a BBC. THAT worked VERY well!

JIM