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Nov 12, 2005 | 07:00 AM

enkeivette

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Melting Slicks

Joined: Sep 2004

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Dual or Single Plane

I'm sure that this has been posted before but every engine is different so help me out...

I've been thinking about swapping my Performer RPM for a Victor Jr. I do drive this car on the street almost everyday but, I feel like I'm not making any serious power till I hit about 3000 rpm anyways. And from there it keeps pulling. I haven't taken it past 5K (motor is still new) but it is supposidly 7K capable.

Here is my setup: 383ci 6" rods hydraulic roller cam .520 in .540 ex 236 in 242 ex @ .05 with 1.5 full roller rockers AFR 195cc Aluminum Heads with the Valve and Spring Upgrade 1 5/8 long tube headers dual 3" mandrel bent exhaust and soon to have a Mighty Demon 750 & an MSD billet HEI.

Last edited by enkeivette; Nov 12, 2005 at 07:04 AM.

Nov 12, 2005 | 07:18 AM

Guru_4_hire

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Joined: Apr 2002

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From: All humans are vermin in the eyes of Guru VA

Cruise-In IV Veteran

Cruise-In V Veteran

you wont get more than 6 or 7 hp over an RPM airgap. I will try and find the article I read about it.

Nov 12, 2005 | 08:02 AM

Gordonm

Race Director

Joined: Dec 1999

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From: Forked River NJ

I switched to the Victor Jr and did not notice any difference in street driving. More performance tough to feel. I have not been to the strip yet with it so I can't tell. No seat of the pants difference

Nov 12, 2005 | 10:31 AM

The Money Pit

Melting Slicks

Joined: Jun 2002

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From: Orrtanna Pa.

I just did that swap on my 406 and the drivability didn't change much at all over comparing the RPM to the Vic Jr.What I did notice is my plugs now burn clean(almost too clean) where they used to carbon up with the RPM intake. I still have the box stock jets in the 3310.

I run a solid Isky cam with 254@.050,and for sure 7000 rpms is no problem.I suspect with your cam the diference between the RPM and Vic Jr would be so slight you wouldn't even feel it.

Nov 12, 2005 | 08:06 PM

MotorHead

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From: Who says "Nothing is impossible" ? I've been doing nothing for years.

I posted this before, my take on it is like this, if you have a high HP motor that will rev out and if you are drag racing and want to get the lowest ET possible the VIc Jr is the intake you want to put on. On a 500HP small block you might get 5 -7HP more at 6500RPM, you will not "feel" this but it will get you .1 sec or a win light over a RPM intake. The RPM might feel like you have more power on the street but I doubt you will notice that either as the Vic. Jr does not give up much on the other end ( low RPM torque ) either. THey are both good intakes.

I have a Vic. Jr on mine because I like the way it looks

Nov 12, 2005 | 09:24 PM

comp

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From: eville in

Hmmmmmm

Nov 15, 2005 | 10:29 PM

kend414

Racer

Joined: Feb 2005

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From: Oradell NJ

I understood single plane intakes were for meant for motors run constantly at high revs. Dual plane is more at home on street driven cars.

Nov 16, 2005 | 09:50 AM

gerry72

Safety Car

Joined: Aug 2000

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From: San Antonio TX

Quote:

Originally Posted by kend414

I understood single plane intakes were for meant for motors run constantly at high revs. Dual plane is more at home on street driven cars.

That's the theory, but practical experience shows otherwise -depending on the engine in question. A Victor Jr. would probably be a huge mistake on a low-compression, basically stock 350 but as compression and cam go up, the use of a Victor on a street-driven car over a dualplane is more transparent.

The theory is, again, dependent on the engine. There is no universal truth.