Posted By: 69L78Nova
Would a Performer RPM be a gain? *DELETED* - 04/22/10 06:39 AM
Post deleted by AZ69Charger
Would a Performer RPM be a gain? *DELETED*
Posted By: Anonymous
Post deleted by Defbob - 04/22/10 06:42 AM
Posted By: Kern Dog
Re: Would a Performer RPM be a gain? - 04/22/10 06:52 AM
When you remove the 318/360 performer, you will see the difference in port size compared to the RPM manifold. The 318/360 is a low to mid range intake with runners about the same size as a 360 2 barrel intake. Ever look at a S.P.2.P. ? You could dang near plug the ports with a grape! The RPM has slightly larger runners and a taller carb base height.
Posted By: 69L78Nova
Re: Would a Performer RPM be a gain? - 04/22/10 07:03 AM
Oh yeah, Ive definately seen the difference in port size. Ive actually heard stories about the factory cast iron TQ manifolds outperforming the Performer. I just want to make sure it wont kill low end torque. And hopefully, it will fit under the hood with the stock dual snorkel air cleaner. Ma put 440s in these beasts, so I would think it would fit
Posted By: Kern Dog
Re: Would a Performer RPM be a gain? - 04/22/10 07:30 AM
The standard iron 440 intake is a real low profile unit, so it may not be fair to compare the height there. I have a 440 with a Performer RPM in my Charger. It clears with a dropped base MP air cleaner. 
Posted By: patrick
Re: Would a Performer RPM be a gain? - 04/22/10 11:10 AM
Quote:
I just picked up a perfect Performer RPM manifold for $40. I was thinking about throwing it on my 360 in my 78 Fury. Its a stock E58, with the exception of an Edelbrock 1406 carb, XE256 cam, Hooker comp headers, and dual 2 1/2" exhaust. Im running a stock converter (for now) and 3.21 gears. The RPM is "advertised" as being effective from 1500-6500rpm. Im unfortunately running a regular Performer on it at the moment. Would the RPM be any kind of a gain over what I have? It may be a dumb question, but most of my experience comes from real performance builds, with much higher power levels, in much lighter cars. I figured for $40...it may be worth a shot. I just dont want to lost any low end torque...gotta get this barge moving!
http://compcams.com/Community/Articles/Details.asp?ID=-738676943
look at this, stock blueprinted 340 that Dulcich did a series of bolt-ons. step 3 is a stock 340 with an 800cfm eddie and headers (that has a cam similar in duration to the XE256). step 4 swaps the stock intake for an eddie RPM air gap (runners are basically the same between the RPM and Air Gap)...25HP increase at 5100 RPM and 25lb-ft at a similar RPM, and even 12-13 lb-ft at 3300...
Posted By: Jerseyboy
Re: Would a Performer RPM be a gain? - 04/22/10 11:11 AM
Quote:
The standard iron 440 intake is a real low profile unit, so it may not be fair to compare the height there. I have a 440 with a Performer RPM in my Charger. It clears with a dropped base MP air cleaner.
Drop Base MP aircleaner? They make such a beast? You mean the cast aluminum unit with Mopar Performance cast into it? If there is a drop base available, I'd like to know about it!
J
Posted By: Mr.Yuck
Re: Would a Performer RPM be a gain? - 04/22/10 11:16 AM
wait is it a "Performer" or a RPM? the RPM is the air-gap type. If you got one of those for $40 you stole it.
Posted By: MoparforLife
Re: Would a Performer RPM be a gain? - 04/22/10 12:34 PM
Quote:the RPM is not nessesarily the Air gap type. It comes either way. But yes it will be a big improvement over the stock or regular Performer intake.
wait is it a "Performer" or a RPM? the RPM is the air-gap type. If you got one of those for $40 you stole it.
Posted By: racealittle
Re: Would a Performer RPM be a gain? - 04/22/10 01:49 PM
I think there is more velocity and bottom end torque with the performer for your present combination.
The rpm intake will not help the bottom end but still be OK. It may get you some more rpm up top (3-500 more). Good heads would allow the rpm intake to show its full potential. Perhaps 1,000 rpm more with better bottom end to boot.
I really don't think it will show up on the time slip with the way your present combination.
Afterall, torque is what will "get the barge moving".
The rpm intake will not help the bottom end but still be OK. It may get you some more rpm up top (3-500 more). Good heads would allow the rpm intake to show its full potential. Perhaps 1,000 rpm more with better bottom end to boot.
I really don't think it will show up on the time slip with the way your present combination.
Afterall, torque is what will "get the barge moving".
Posted By: patrick
Re: Would a Performer RPM be a gain? - 04/22/10 02:03 PM
Quote:
I think there is more velocity and bottom end torque with the performer for your present combination.
The rpm intake will not help the bottom end but still be OK. It may get you some more rpm up top (3-500 more). Good heads would allow the rpm intake to show its full potential. Perhaps 1,000 rpm more with better bottom end to boot.
I really don't think it will show up on the time slip with the way your present combination.
Afterall, torque is what will "get the barge moving".
well...
looking at another dulcich article here on a smogger 360, looking between step 3&4, the only difference is a stock spread bore intake vs. an edelbrock performer.
granted, the performer is up 10 lb-ft at 2000 RPM where the test starts, that advantage is gone by 2400 RPM, and is actually down 10lb-ft by 2800 RPM. and this is with a stock 360 cam.
looking at the Dulcich 340 and 360 articles I referenced, it looks like on a 360ish cube motor, even a mild one, you may loose a minimal amount of torque on the low end--2400RPM on down (likely right around the flash RPM of the converter), but gain significantly on midrange torque & HP from at least 3k on up....I see no downsides to running it, and worst case maybe upgrading to a stock high stall, or MP166k converter (which flashed to 2800 behind my 360 in a 3.55 equipped 5th ave) would mitigate the 10 lb-ft loss below 2400 RPM
Posted By: 69L78Nova
Re: Would a Performer RPM be a gain? - 04/22/10 03:50 PM
Yeah, I guess Ill try it out. My current converter only flashes to 1500. I was going to eventually swap it out for something in the 2000-2200 range. And in reply to a question asked earlier, it is not an air gap. It is a regular Performer RPM...in which case, I still stole it. Thanks everybody...Ill give it a shot
Posted By: MoparforLife
Re: Would a Performer RPM be a gain? - 04/22/10 04:13 PM
Quote:Yes you did steal it. Did you use a gun????
Yeah, I guess Ill try it out. My current converter only flashes to 1500. I was going to eventually swap it out for something in the 2000-2200 range. And in reply to a question asked earlier, it is not an air gap. It is a regular Performer RPM...in which case, I still stole it. Thanks everybody...Ill give it a shot
Yes it is a better manifold than the standard Performer or the cast OEM manifold. Very comparable to the Airgap or the LD340. I am very confident that you will like it.
Posted By: patrick
Re: Would a Performer RPM be a gain? - 04/22/10 04:14 PM
others have said after contacting engine builders and edelbrock tech support, they don't see a big enough difference between the regular RPM and the air gap to replace one with the other, so those air gap numbers on the 340 should be fairly representative of what you'd see with a regular RPM.
Posted By: BeEtLeJuIcE !
Re: Would a Performer RPM be a gain? - 04/22/10 04:39 PM
Quote:
I just dont want to lost any low end torque...gotta get this barge moving!
You saying THIS .....keep whatcha' got !!
Posted By: patrick
Re: Would a Performer RPM be a gain? - 04/22/10 07:39 PM
Quote:Quote:
I just dont want to lost any low end torque...gotta get this barge moving!
You saying THIS .....keep whatcha' got !!
I bet he won't lose enough to notice....
he'll gain in the midrange quite significantly.
next upgrade, get a stock high stall converter.
Posted By: MoparforLife
Re: Would a Performer RPM be a gain? - 04/22/10 07:53 PM
Quote:Quote:Quote:
I just dont want to lost any low end torque...gotta get this barge moving!
You saying THIS .....keep whatcha' got !!
I bet he won't lose enough to notice....
he'll gain in the midrange quite significantly.
next upgrade, get a stock high stall converter.
Posted By: Kern Dog
Re: Would a Performer RPM be a gain? - 04/23/10 04:31 AM
Sorry about the tease! Yeah, I have the cast aluminum MP air cleaner, but had the base modified to fit. I took a dropped base to a guy who TIG welded the center to the outer rim of the MP base. Its funny... I never set out to build a custom car, but my Charger has so many "massaged" parts on it, it technically is a custom !