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Old 09-16-2008, 10:57 AM
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Performer or Performer RPM

I have a Performer for a SBC,using 461 heads,218@50 cam,600 carb.Would a Performer RMP make any real gains under 4000rmp over the Perfomer?I know the RPMs peak is rated from 1500 to 6000+. Cisco

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Last edited by TheCiscoKid; 09-16-2008 at 11:13 AM. Reason: addition
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Old 09-16-2008, 12:10 PM
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There would be a slight gain, but so little you wouldn`t know the difference.
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Old 09-16-2008, 03:02 PM
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agree with Doublevision,

you will have just a bit less/weaker low rpms Hg carb signal and A/F velocity with the RPM which hurts TQ acceleration fun a bit in order to gain just a bit more HP at your cam HP peak...

the performer operating range rpms is enough for your cam HP rpms peak...

a favorite so true so often quote (by Max Keith a member):
"alot more gooder is not necessarily more good!"

Last edited by red65mustang; 09-16-2008 at 03:15 PM.
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Old 09-16-2008, 03:37 PM
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RPMs are a great intake for engines that are a couple steps hotter than yours. For instance if you were running Vortec heads with a 220* cam, the RPM might open up a little high-RPM flow for you, but I wouldn't worry about it in your application. Too little gain for the work involved and you might lose as much low end torque as you gain with the HP.
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Old 09-16-2008, 05:04 PM
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Performer or Performer RPM

Thanks guys, I'm using the Performer I have.The only test results I could find said a stock steel manifold had better bottom end than a Performer and the RMP was the only intake that doesn't need porting.
I didn't notice before, but I have a 4 hole spacer on,helps clear the stainless rad hose,but the Performer2101 interfers with the 4 holes of the Edbr 600 carb.I'll grind the manifold a bit ,maybe I'll get better flow. Again thanks guys, Cisco.
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Old 09-17-2008, 06:06 AM
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Although not for chevy's here is an intake test:
http://www.hotrod.com/techarticles/h...aro/index.html
Page 6&7 for performer and rpm.

Edelbrock Performer
Peak torque: 455 lb-ft @ 3,800
Peak horsepower: 439 hp @ 5,900
Power at 3,000 rpm: 418 lb-ft, 239 hp
Power at 5,000 rpm: 426 lb-ft, 406 hp
Average 2,500-4,500: 427 lb-ft, 288 hp
Average 4,500-6,000: 415 lb-ft, 413 hp
Average 2,500-6,000: 422 lb-ft, 341 hp

Edelbrock Performer RPM
Peak torque: 457 lb-ft @ 4,000
Peak horsepower: 451 hp @ 5,900
Power at 3,000 rpm: 408 lb-ft, 233 hp
Power at 5,000 rpm: 442 lb-ft, 421 hp
Average 2,500-4,500: 424 lb-ft, 287 hp
Average 4,500-6,000: 428 lb-ft, 426 hp
Average 2,500-6,000: 425 lb-ft, 346 hp
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Old 09-17-2008, 07:39 AM
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spitnl,
your example does show a 12HP gain with the RPM intake...

but....

that is because they used a much higher duration cam (239/247 versus Cisco's 218/218) and higher CR (10.3 to match the cam) which doesn't reach the HP peak rpms till 6500+rpms (if they had decent heads on the motor)....

Cisco's 218 cam HP peak is only 5,000(?) rpms

Cisco,
yes, a stock intake typically has smaller runners cc's and less total volume for the piston to pull a vacuum from so they do make more Hg for better "atomization" and A/F velocity to fill the chamber at low rpms which makes more 1,000 to 3000rpms acceleration TQ....
but, a stock intake will cost you some top end HP because it chokes out at about 4500rpms.....
there is very little total volume difference between a performer and a stock 350 manifold, just the 20lbs+ weight savings over cast iron makes it worth keeping on the motor...

from memory, the Edelbrock is 1 and 11/16" bore which is what you want to match the spacer holes diameter too for a straight shot into the intake
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Old 09-17-2008, 07:51 AM
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Quote:
Originally Posted by red65mustang
spitnl,
your example does show a 12HP gain with the RPM intake...

but....

that is because they used a much higher duration cam (239/247 versus Cisco's 218/218) and higher CR (10.3 to match the cam) which doesn't reach the HP peak rpms till 6500+rpms (if they had decent heads on the motor)....

Cisco's 218 cam HP peak is only 5,000(?) rpms
And even with the bigger cam and compression the standard performer is better at 3000rpm and average from 2,500 to 4,500.
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Old 09-17-2008, 08:54 AM
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Here is a dyno test at car junkie tv they start with victor and a airgap and then a performer http://www.carjunkietv.com/watch-sho...ictor-Jr..html
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Old 09-17-2008, 01:53 PM
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just for laughs,,,,,,
here's a Ford 289 "intakes shoot out" magazine graph from the late 60's!!!!

from memory, it had just the 271hipo cam and 10.5CR(?)....

the Ford "Cobra" was the RPM intake back then
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Old 09-17-2008, 04:11 PM
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Quote:
Originally Posted by TheCiscoKid
Thanks guys, I'm using the Performer I have.The only test results I could find said a stock steel manifold had better bottom end than a Performer and the RMP was the only intake that doesn't need porting.
I didn't notice before, but I have a 4 hole spacer on,helps clear the stainless rad hose,but the Performer2101 interfers with the 4 holes of the Edbr 600 carb.I'll grind the manifold a bit ,maybe I'll get better flow. Again thanks guys, Cisco.
Before you start grinding which can harm flow consider this route,Google: Transdapt 2531
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Old 09-17-2008, 08:12 PM
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Performer or Performer RPM

I have the 1'' aluminum Torque swirl adapter like Summit sells for $40,except picked mine up on Ebay for $5.On a Perfomer 2101 the centre part dividing the manifold looks like it will interfer with the butterflies of an Edelbrock squarebore 600, it blocks the adaptor.
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Old 09-17-2008, 09:03 PM
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The Weiand has a full divider between plenums to help lowest rpm torque. Edel has the divider cut down to share volume between plenums.
Do not use any form of spacer that allows passage between plenums. That will hurt low end and increase upper power.
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Old 09-17-2008, 11:31 PM
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Performer or Performer RPM

it's a 4 holer
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Old 09-18-2008, 06:29 AM
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the bores on the Edie at 1 and 11/16"....

you want a absolutely straight 1 and 11/16" shot from the bottem of the carb all the way into the manifold....

change to a dog-leg rad hose mount on the motor for more clearance and no spacer.... or... go find a correct spacer.....
(fair chance a machine shop will charge $40 to re-work yours if it's not 1 and 11/16" bores)
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