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Old 12-14-2009, 08:29 PM
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RPM Air Gap Intake

Has anyone used a RPM air gap intake? Or, more specifically has anyone used one on vortec heads? If so how did it work out and what kind of power did you make?

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Old 12-15-2009, 01:33 AM
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I ran one this summer on my 350sbc. I had a 750 vac sec 3310-3 carb. It ran great after some minor tuning issues solved with an AFR gage.

The single biggest factor is the air gap has no carb heat from the exhaust crossover that is on the non air gap. The motor needed a lot of choke on cold starts and simple did not run real well untill fully warmed up to at least 180 deg. On cool days (30' and 40's) it was a real pain to get warmed up. Once there it was ok.

Performance was very good but it would have been much easier to live with if it were a non air gap. Save them for the track, use a non air gap for the street. Power wise I don't think you would notice the difference.

The interesting thing is that I put a 6-71 blower and 2 750 DP's on the exact same motor and the idle speed went from 1100 unblown to 850 blown and it was dead smooth. this shows pretty dramatically that there are fuel distribution and vaporization problems at idle even warmed up due to the cold manifold. Get a non air gap and don't block off the heat riser port. BTW I just started the blower motor up at 10 deg F. Started right up and after 2-3 minutes it was idling at 850.

Last edited by bentwings; 12-15-2009 at 01:41 AM.
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Old 12-15-2009, 11:39 AM
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I have the Professional Products "Crosswind" vortec manifold very similar to the Edey air gap. Runs excellent. Brutal torque and power to 6700rpm on my 400.
Idles at 750-800 rpm. Great drivability once warmed up (no choke).
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Old 12-15-2009, 12:13 PM
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intake

I ran one on a 355 with vortec heads in a daily driver 69 chevelle. Drove it all year round even in the ice cold PA winters. It worked great. No issues at all.

The car at 3400 Lbs, ran 12.90's at almost 109 Mph with a 2.0 60' time, full exhaust, street tires(real street tires not a drag radial) and a 3.31 gear.


Keith
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Old 12-15-2009, 02:29 PM
How fast is fast enough?
 
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Quote:
Originally Posted by k-star
I ran one on a 355 with vortec heads in a daily driver 69 chevelle. Drove it all year round even in the ice cold PA winters. It worked great. No issues at all.

The car at 3400 Lbs, ran 12.90's at almost 109 Mph with a 2.0 60' time, full exhaust, street tires(real street tires not a drag radial) and a 3.31 gear.


Keith
a '69 Chevelle... Probably was fixed up real nice too. Its a shame they don't make cars with charecter like that any more.
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Old 12-15-2009, 06:15 PM
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i ordered an endurashine,should be here friday
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Old 12-15-2009, 06:35 PM
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Congratulations. Its a nice piece.
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Old 12-15-2009, 07:57 PM
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Quote:
Originally Posted by ap72
a '69 Chevelle... Probably was fixed up real nice too. Its a shame they don't make cars with charecter like that any more.

Actually, it was about 4 different shades of blue, with a red ss hood and grey epoxy primer roof where I removed the vinyl top. I tried to make it as ragged out as I could so it wouldn't bother me to drive it all the time. Shocked alot of young 5.0 driving kids with it.They had to explain to there passenger how they got spanked by a Grey hair guy in a ragged out old Chevelle.

Keith
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Old 12-16-2009, 10:48 AM
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That was one of the reasons why I never bothered to get my Cutlass painted. Even so it was all blue the paint was shot and the vinyl top has rips in it. I did lower it 2 inches front and rear, added cragar drag stars and BFG`s. The best part was tagging mustangs and especially the ricer kids. I used to laugh so hard when a ricer kid would kick it and the fart can would sound off like a swarm of bee`s as I pulled away easily without my foot halfway to the floor. Gotta love it when the rumble of Turbo mufflers drown out fart cans.
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