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Eddy RPM air gap/ crosswinds for SB #236979 02/26/09 02:46 PM 02/26/09 02:46 PM
Joined: Jan 2003 Posts: 6,816 Alton, IL D Dakota_Don OP master
Dakota_Don OP master D Joined: Jan 2003 Posts: 6,816 Alton, IL	Has anyone heard this or experienced this. I called a company to recurve the MP dist for my stroker, and after I gave him the specs they asked " how does it idle" I said kinda rough, I think its in the carb or dist, why do you ask? He said cuz the RPM airgap and the crosswinds port runners are to large and the engine will idle rough. He went on to say he has seen it many times in chevys and mopars, he also said i should use the RPM performer. I have never heard this before abouth either of the 2 intakes. Anyone else ?

Re: Eddy RPM air gap/ crosswinds for SB [Re: Dakota_Don] #236980 02/26/09 02:54 PM 02/26/09 02:54 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	nope...got a air gap on my duster.. it idles a little rough due to the camshaft 231/237 @.050 duration. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: Eddy RPM air gap/ crosswinds for SB [Re: 70AARcuda] #236981 02/26/09 02:57 PM 02/26/09 02:57 PM
Joined: Jan 2003 Posts: 6,816 Alton, IL D Dakota_Don OP master
Dakota_Don OP master D Joined: Jan 2003 Posts: 6,816 Alton, IL	on my old 360 set up, 10.1 cr with XE274H the engine idled rough, and not from the cam.. I beleive its in the carb or the dist.. when the stroker gets back from the shop ill look into it more..I dont know if I wanna do bussiness with this guy again..

Re: Eddy RPM air gap/ crosswinds for SB [Re: Dakota_Don] #236982 02/26/09 03:13 PM 02/26/09 03:13 PM
Joined: Jan 2004 Posts: 755 Tempe, AZ L loco340cuda super stock
loco340cuda super stock L Joined: Jan 2004 Posts: 755 Tempe, AZ	I have an airgap on my 417 stroker and it idles a little rough but that is becuase it has a MP 484 cam in it (241/241 duration, .484/.484 lift, with a 108 lsa. I think the rough idle is mostly due to the lsa becuase a 241/241 cam in a 417 stroker is not that big of a cam. 70 Cuda 340 4 speed - now stroked to 416ci (SOLD) 2017 Mustang Shelby GT350

Re: Eddy RPM air gap/ crosswinds for SB [Re: loco340cuda] #236983 02/26/09 06:36 PM 02/26/09 06:36 PM
Joined: Feb 2003 Posts: 12,675 Columbia, CT M moper I Live Here
moper I Live Here M Joined: Feb 2003 Posts: 12,675 Columbia, CT	He's mistaken. Not sure who you called, but there are a couple who really profess to "know" a lot, and they are simply putting a huge emphasis on certain aspects of a build. You'd be hard pressed to get an Airgap to idle rough on a 318. The Crosswind has smaller ports, both in length and volume, and the casting quality stinks. So a rough idle can be from poor fitment, or porosity, or port mismatch. The one I tried seeped coolant out the rear corner of the casting, had poorly tapped holes, and was a very brittle aluminum when you did try and tap it... There are reasons they are half the money, and it's not a perfect copy as some suggest. Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.

Re: Eddy RPM air gap/ crosswinds for SB [Re: moper] #236984 02/26/09 06:52 PM 02/26/09 06:52 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Moper is right. Not an issue. One ironic thing about the idiotic "advice" is that the Perf RPM and the Air Gap have the same size runners. They are the same intake except the Air Gap heats the intake air less. This may be an issue on a cold start in cold climate but it isn't because of the runner size! I would not recommend any Performance Products intakes. R.

Re: Eddy RPM air gap/ crosswinds for SB [Re: dogdays] #236985 02/26/09 07:42 PM 02/26/09 07:42 PM
Joined: Jan 2003 Posts: 1,482 Lake Orion, MI goldduster318 pro stock
goldduster318 pro stock Joined: Jan 2003 Posts: 1,482 Lake Orion, MI	I have an air gap on my 360, the magnum head version. It has a Summit K6901 cam witch is 218/228 duration at .050" lift and about .470" lift at the valve. I have a 4-speed and this thing idles "stock" smooth at 800 rpm. I'd also be lucky to have an 8.8:1 compression ratio. The air gap works great. make sure your choke works properly. My car has a 600 holley electric choke. '70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip

Re: Eddy RPM air gap/ crosswinds for SB [Re: dogdays] #236986 02/27/09 02:17 AM 02/27/09 02:17 AM
Joined: Jan 2003 Posts: 27,467 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,467 So Cal	Quote: Moper is right. Not an issue. One ironic thing about the idiotic "advice" is that the Perf RPM and the Air Gap have the same size runners. They are the same intake except the Air Gap heats the intake air less. This may be an issue on a cold start in cold climate but it isn't because of the runner size! I would not recommend any Performance Products intakes. R. So the Performer RPM and the Air Gap are the some exact height? Are they the same manifolds, just the air gap is hollowed out underneath the plenum??????

Re: Eddy RPM air gap/ crosswinds for SB [Re: dogdays] #236987 02/27/09 02:52 AM 02/27/09 02:52 AM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: Moper is right. Not an issue. One ironic thing about the idiotic "advice" is that the Perf RPM and the Air Gap have the same size runners. They are the same intake except the Air Gap heats the intake air less. This may be an issue on a cold start in cold climate but it isn't because of the runner size! I would not recommend any Performance Products intakes. R. as far as the crosswind intake... http://www.popularhotrodding.com/tech/0901phr_mopar_318_magnum_engine/index.html they ran a crosswind intake on this 318.... Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: Eddy RPM air gap/ crosswinds for SB [Re: 70AARcuda] #236988 02/27/09 08:47 AM 02/27/09 08:47 AM
Joined: Nov 2006 Posts: 1,086 Baton Rouge, La. StandOnIt super stock
StandOnIt super stock Joined: Nov 2006 Posts: 1,086 Baton Rouge, La.	Hey, thanks for that link, nice read and great info. I also have the PP airgap intake. I did do a little cleanup in the runners and such with a healthy amount of the white in color engine paint with the ceramic in it on the bottom of it to seal the bottom and reflect heat. The carb stays very cool during operation with a Wilson 1" spacer. It works well for me. 76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.

Re: Eddy RPM air gap/ crosswinds for SB [Re: autoxcuda] #236989 02/27/09 10:12 AM 02/27/09 10:12 AM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	Quote: Quote: Moper is right. Not an issue. One ironic thing about the idiotic "advice" is that the Perf RPM and the Air Gap have the same size runners. They are the same intake except the Air Gap heats the intake air less. This may be an issue on a cold start in cold climate but it isn't because of the runner size! I would not recommend any Performance Products intakes. R. So the Performer RPM and the Air Gap are the some exact height? Are they the same manifolds, just the air gap is hollowed out underneath the plenum?????? yup 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: Eddy RPM air gap/ crosswinds for SB [Re: patrick] #236990 02/27/09 10:31 AM 02/27/09 10:31 AM
Joined: May 2004 Posts: 12,386 Taxes & Virus's R-US, NY Dragula I Live Here
Dragula I Live Here Joined: May 2004 Posts: 12,386 Taxes & Virus's R-US, NY	That's funny.....I have an air gap and an 850dp on my 360, and it idles at 700rpm. And the carb is an all out race carb, no choke, no choke horn, no nothing. And I ported my intake out even further...I also run the 484 cam, and its a beast with the airgap.. '70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft) https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car) https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car) https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9) '66 Barracuda AWB Stretched nose Blown 440 Car in build stage '71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph https://www.youtube.com/watch?v=Znuo3jMUXTk

Re: Eddy RPM air gap/ crosswinds for SB [Re: Dragula] #236991 02/27/09 11:39 AM 02/27/09 11:39 AM
Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN R Rug_Trucker I Live Here
Rug_Trucker I Live Here R Joined: Jan 2003 Posts: 14,610 Not2farfromNashville, TN	PHR says 477HP yet the dyno sheet says other wise What's up with the breather where the fuel pump used to go? That crank is pretty! Guess at their HP level they could have gone cast for less reciprocating weight? "The only thing to do for triumph of evil is for good men to do nothing" "NUNQUAM NON PARATUS!"

Re: Eddy RPM air gap/ crosswinds for SB [Re: Rug_Trucker] #236992 02/27/09 12:32 PM 02/27/09 12:32 PM
Joined: Jan 2003 Posts: 6,816 Alton, IL D Dakota_Don OP master
Dakota_Don OP master D Joined: Jan 2003 Posts: 6,816 Alton, IL	thak, I never hear of this before and i know some folks here would clear thst up...Cuz i never heard it.

Re: Eddy RPM air gap/ crosswinds for SB [Re: Dakota_Don] #236993 02/27/09 04:59 PM 02/27/09 04:59 PM
Joined: Apr 2004 Posts: 1,396 Mass dgc333 pro stock
dgc333 pro stock Joined: Apr 2004 Posts: 1,396 Mass	Quote: Has anyone heard this or experienced this. I called a company to recurve the MP dist for my stroker, and after I gave him the specs they asked " how does it idle" I said kinda rough, I think its in the carb or dist, why do you ask? He said cuz the RPM airgap and the crosswinds port runners are to large and the engine will idle rough. He went on to say he has seen it many times in chevys and mopars, he also said i should use the RPM performer. I have never heard this before abouth either of the 2 intakes. Anyone else ? FWIW, the ports and runners on an RPM Air Gap and RPM Performer are the same. The Crosswind has slightly smaller runners than the Air Gap. Also, if you have an MP distributor that was made since about 2002 it can be adjusted as simply as loosening a set screw and adjusting the stops. MP and Mallory sell the same kit that has an assortment of springs to dial in the curve. Its really quite easy to do your self. BTW, I have a Crosswind on a 360 with a 224/230 @ 0.050 cam and it idles almost as smooth as a stock engine at 650 rpm. It did require 17 degrees of initial advance to obtain the good idle and crisp off idle throttle reponse. Last edited by dgc333; 02/27/09 05:01 PM. Dave Clement Pembroke, MA 03 PT Cruiser GT Turbo 99 Dakota SLT+ CC 4x4 68 Barracuda sport coupe http://home.comcast.net/~dgc333/

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