M1 vs. RPM
#2439282
01/23/18 12:17 AM
01/23/18 12:17 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
OP
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OP
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Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
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I built a 512 for my Super Bee last year, and here are the basics: .040 over 400 block. Source 4.25" stroke bottom end with the lighter crank and upgraded rod bolts. TF 240 heads, Scott Brown solid lift cam, Hughes 1.5 rockers. 10.6:1 compression. I read a bit on intakes before I chose one, and then put out the word looking for an M1 or a Holley Street Dominator. A friend thought he had a SD, and it ended up being a Performer RPM, so I picked that up. Then I found a screaming deal on an M1 single plane. I put the M1 on, but got to talking with Cab Burge and he says the RPM would be a better choice. What do you all think? I am pretty sure the M1 gives me more hood clearance with the N-96 air box, but I know an RPM will fit, I had one on the previous 383 that was in it. It's going in my '69 Bee, 4-speed, 3.54 Dana. Suspension will be switched over to either Assassin Bars or Cal-Tracs once I get it all back together.
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: M1 vs. RPM
[Re: OhioMopar]
#2439324
01/23/18 01:19 AM
01/23/18 01:19 AM
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Joined: Oct 2004
Posts: 5,620 long island NY
Ari440
master
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master
Joined: Oct 2004
Posts: 5,620
long island NY
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M1
ITS A 512 CI MOTOR
two inch spacer help out with a 850 carb
Last edited by Ari440; 01/23/18 01:20 AM.
1.39 9.85 - 137 mph
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Re: M1 vs. RPM
[Re: OhioMopar]
#2439352
01/23/18 01:59 AM
01/23/18 01:59 AM
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Joined: Feb 2003
Posts: 1,107 Massillon, Ohio
cudatom
super stock
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super stock
Joined: Feb 2003
Posts: 1,107
Massillon, Ohio
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I have ran the M1 on my 512 (400) for going on 4 yrs now. Throttle response is a non issue. It is great at low, mid and full.
Last yr I switched to a 4500 version of the M1, no loss of throttle response on the street but it is .12 faster in the 1/8. I hope to get to run some 1/4 mile times this yr.
With the 512 there is so much low end torque I dont think you will notice any let off by running a single plane.
Ok
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Re: M1 vs. RPM
[Re: OhioMopar]
#2439374
01/23/18 02:56 AM
01/23/18 02:56 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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PHR did a B series intake shootout a few years ago that you’ll find if you google it. It suggests that those two make similar HP up top, but the RPM will offer a much broader torque curve and better power down low. With 3.54 gears and especially in a big street-heavy B-body, what you need is midrange torque. My sense is the RPM makes more of the meat your car needs. I run one on my 452” B motor. Last fall I added a short 1/2” open spacer and blended the top of the intakes carb-pad in an effort to open up more plenum volume to each cylinder. Although I didn’t do a back to back test, I noted that the car felt like it wanted more RPMs and made better top end power. It went faster but the air was good, so...??
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: M1 vs. RPM
[Re: StealthWedge67]
#2439382
01/23/18 03:11 AM
01/23/18 03:11 AM
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Joined: Jan 2003
Posts: 1,811 North Dakota
Azzkikrcuda
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,811
North Dakota
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On a 512 go with the M1. On my old 440 with 3.55's I had the same question . There was almost no difference at the the track or on the street between the two intakes.
The only Carbs I care about are under the hood!
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Re: M1 vs. RPM
[Re: Ari440]
#2439384
01/23/18 03:12 AM
01/23/18 03:12 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
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master
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OP
master
Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
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M1
ITS A 512 CI MOTOR
two inch spacer help out with a 850 carb I guarantee neither will fit under my hood with a 2" spacer.
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Re: M1 vs. RPM
[Re: cudatom]
#2439386
01/23/18 03:14 AM
01/23/18 03:14 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
OP
master
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OP
master
Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
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I have ran the M1 on my 512 (400) for going on 4 yrs now. Throttle response is a non issue. It is great at low, mid and full.
Last yr I switched to a 4500 version of the M1, no loss of throttle response on the street but it is .12 faster in the 1/8. I hope to get to run some 1/4 mile times this yr.
With the 512 there is so much low end torque I dont think you will notice any let off by running a single plane. I was hoping someone had some real world experience with it. I was thinking the torque should be a non-issue, but I was concerned about the 3.54's.
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Re: M1 vs. RPM
[Re: StealthWedge67]
#2439387
01/23/18 03:14 AM
01/23/18 03:14 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
OP
master
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OP
master
Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
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PHR did a B series intake shootout a few years ago that you’ll find if you google it. It suggests that those two make similar HP up top, but the RPM will offer a much broader torque curve and better power down low. With 3.54 gears and especially in a big street-heavy B-body, what you need is midrange torque. My sense is the RPM makes more of the meat your car needs. I run one on my 452” B motor. Last fall I added a short 1/2” open spacer and blended the top of the intakes carb-pad in an effort to open up more plenum volume to each cylinder. Although I didn’t do a back to back test, I noted that the car felt like it wanted more RPMs and made better top end power. It went faster but the air was good, so...?? What gear do you run?
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Re: M1 vs. RPM
[Re: OhioMopar]
#2439830
01/24/18 01:06 AM
01/24/18 01:06 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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PHR did a B series intake shootout a few years ago that you’ll find if you google it. It suggests that those two make similar HP up top, but the RPM will offer a much broader torque curve and better power down low. With 3.54 gears and especially in a big street-heavy B-body, what you need is midrange torque. My sense is the RPM makes more of the meat your car needs. I run one on my 452” B motor. Last fall I added a short 1/2” open spacer and blended the top of the intakes carb-pad in an effort to open up more plenum volume to each cylinder. Although I didn’t do a back to back test, I noted that the car felt like it wanted more RPMs and made better top end power. It went faster but the air was good, so...?? What gear do you run? I run 4.10’s with a 28” tire. I’ve toyed with the idea of an M1; I’d be interested in your results if you were able to do a back to back test.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: M1 vs. RPM
[Re: StealthWedge67]
#2439834
01/24/18 01:10 AM
01/24/18 01:10 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
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OP
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Mt.Gilead, Ohio
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I'll see what I can figure out. I'd like to switch them on the same trip to the track and see which one performs.
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: M1 vs. RPM
[Re: OhioMopar]
#2439880
01/24/18 03:52 AM
01/24/18 03:52 AM
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Joined: Feb 2003
Posts: 1,107 Massillon, Ohio
cudatom
super stock
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super stock
Joined: Feb 2003
Posts: 1,107
Massillon, Ohio
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I run a small Comp Cams Mech, grind XS282S. Like Stealthwedge67 I also run 4.10 and 28" tires and my car is 4000lbs.
Going to try and get something closer to 29" tall tire. The convertor on my car is tight enough that when I drive on the street that when I left off the brake it moves w/little slippage. On the track when I mash it it flashed to 4500. That is a little higher than I wanted. Was wanting closer to 4-4200. I shift at 5500-5600. If I'm running 1/4 I cross the stripe at 6100. I wont return my convertor because its too conmsistent. But I will be trying one another one from PTC that is a tad tighter to see if I can even out the shift points and finish line rpms.
The edelbrock is a great intake, my brother runs it in his Cuda w/the same cam I do. Only difference is his is 446CU and I'm 512. Which ever you chose you will like. The 512 is a great set up.
Ok
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Re: M1 vs. RPM
[Re: cudatom]
#2439888
01/24/18 05:42 AM
01/24/18 05:42 AM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
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OP
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Posts: 8,779
Mt.Gilead, Ohio
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I was planning on going with a 29-30" tall tire. I plan on driving it a lot, so I will be attempting to keep the revs down. 295-65/15 is my tire of choice, but it is only available in drag radials and the super expensive flame-tread Mickey Thompson tires.
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: M1 vs. RPM
[Re: OhioMopar]
#2439965
01/24/18 12:49 PM
01/24/18 12:49 PM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Really don't see why a RPM would even be mentioned on a 512?
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: M1 vs. RPM
[Re: Cab_Burge]
#2440216
01/24/18 08:35 PM
01/24/18 08:35 PM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Von, the RPM is a great intake for the street No matter what C.I on anything that has less than a all out solid roller cam with 440 size port heads I've dyno tested multiple RB and B motors with a bunch of different intake, the RPM is the best over all for low RPM HP and torque, especially with light part throttle driving below 3500 RPM I haven't done any same day at the track tests on BB 440 intakes in a long time so no valid feedback on that I still venture that overall...a RPM is a choke on 500 plus inches, unless we are talking a super heavy/pulling type application.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: M1 vs. RPM
[Re: OhioMopar]
#2440217
01/24/18 08:39 PM
01/24/18 08:39 PM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Silver,
Exhaust is costing you a solid tenth, (maybe .15) , it looks like?
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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