Visit The Dirt Forum for More Information

Author Topic:   intake manifolds
rhondago
Dirt Roller

Total posts: 7
posted August 21, 2001 11:08 AM
Does anyone have any thoughts on the Performer RPM Air Gap manifolds as compared to the Victor Jr? We run a 355 with dome pistons, 6 inch rods and have a 13.5 to 1 compression ratio. We keep the rpms to 6300-6700.

RangeRover
Dirt Full Roller

Total posts: 37
posted August 21, 2001 05:58 PM
If you keep the rpm relatively high throughout the track, meaning not below about 4000 through the corners and your car is not too heavy (3200# or less), I believe you could maximize power with the Victor Jr. With the components you listed, I have no doubt that you run a healthy enough cam that this would be the way to go, unless you do run at a track that forces you to drop rpm drastically from the end of the straight to the pick up point on exit. In the latter situation you would see more benefit from the torque-restoring "air gap". My $.02.

sdhnc29
Dirt Full Roller

Total posts: 74
posted August 21, 2001 10:04 PM
The Victor Jr. will work better for you no matter what RPM you are turning . The benefits of the Performer at low RPM are minimal , 5-10 foot pounds . But the benefits of the Victor Jr. over the Performer , are drastic throughout the whole RPM range ! Be sure to use a 2" open spacer if you use the V-Jr . They like a 2" open spacer very much on most all applications .

What type of head are you using ? There are better intakes than the Victor Jr. , if your rules allow them .

rhondago
Dirt Roller

Total posts: 7
posted August 22, 2001 11:52 AM
quote:
Originally posted by rhondago:
Does anyone have any thoughts on the Performer RPM Air Gap manifolds as compared to the Victor Jr? We run a 355 with dome pistons, 6 inch rods and have a 13.5 to 1 compression ratio. We keep the rpms to 6300-6700.

Thanks for the input guys. It's always good to get as many opinions as possible. We are running 461 heads, ported and polished with 202 and 165 valves. We are also running a power glide with the direct drive set up which some have said points more toward using the performer air gap???? Other than the 2 intakes that I mentioned; what others would you suggest we consider?

rhondago
Dirt Roller

Total posts: 7
posted August 22, 2001 12:04 PM
quote:
Originally posted by sdhnc29:
The Victor Jr. will work better for you no matter what RPM you are turning . The benefits of the Performer at low RPM are minimal , 5-10 foot pounds . But the benefits of the Victor Jr. over the Performer , are drastic throughout the whole RPM range ! Be sure to use a 2" open spacer if you use the V-Jr . They like a 2" open spacer very much on most all applications .

What type of head are you using ? There are better intakes than the Victor Jr. , if your rules allow them .



We are running 461 heads; ported, polished, big valves, cc-ed at 64. We are running a power glide with the direct drive valve set up. Some have said the automatic is all the more reason to go with the performer air gap???? Other than the 2 intakes that I've mentioned what would you recommend? Thanks for the info.

sdhnc29
Dirt Full Roller

Total posts: 74
posted August 22, 2001 09:45 PM
If you use the Performer , you will lose all the way around !

Probably the best intake right now , for use on 23deg. heads is the Super Victor . My second choice would be the Wilson . Both are modern intakes ! But if I was spending your money , I'd definitely get the Super Victor . The ones that are pointing toward the Performer , probably don't have a dyno .

RangeRover
Dirt Full Roller

Total posts: 37
posted August 23, 2001 07:35 AM
I'm leaning towards the Victor-type open plenum manifold in this particular scenario, too, but there's something very important to be said about dyno numbers. The peak power numbers achieved during dyno testing don't necessarily mean they're the best bet for a car's drivability characteristics with a certain driver on certain track with endless limitations, not the least of which are grip and rule restrictions in general. Undoubtedly, the dyno is a fantastic tool for engine development and tuning, but it can not be the final determinant for choosing components for racing. I personally look more closely at the numbers in target RPM ranges and their relationships to the peak numbers.

ZIGGY
Dirt Roller

Total posts: 6
posted August 23, 2001 09:06 AM
rhondago, I've got a nice Super Victor for sale at a good price if you decide to go that way. Send me a private message or post here if you're interested. My personal experience
with them on alky is that they need a fair amount of motor to work well. They're certainly too much for the 'YMCA' claimer stuff I run here in Texas.

Back to the Archives