Quote:
Originally Posted by olddog
Every book I have read on testing an air gap verses a Vic Junior on the same engine with the same carb shows that the Air gap gives much more low end torque and flatter torque curve. You have to have a combo that is capable of fairly high rpm for the Vic Junior to pay off big. On a typical street engine, you will give up a lot more torque, where you drive most of the time to gain a little bit at an rpm you will rarely see.
Sure you might make 20 Hp more for bragging rights with the single plane but on the street is will feel weaker where you drive.
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That is correct. I had Keith Craft install a Performer Air Gap instead of a Victor Jr for big broad low end torque band. The engine did better than they expected, 572/582 vs 585/565. The torque curve was on the downhill at 4300 RPM, so the torque number is actually higher. You will want to select a cam to compliment the intake. If you go with a BIG cam, I would recommend an EFI for low end driveability. FiTech or equivelent works well with a high volume in tank pump.