Re: Cam for a 512
[Re: Thumperdart]
#2017457
02/22/16 03:50 PM
02/22/16 03:50 PM
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Joined: Jan 2003
Posts: 9,924 Weddington, N.C.
Streetwize
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Weddington, N.C.
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And if you do need a cam you can regrind the roller you have up to another ~8-10 degrees @.050 and generally +/- 2 degrees on the lobe spread. you'd have to send the core to be sure but generally you can get at least one regrind on a roller Billet...for about a third the cost of another new one.
Last edited by Streetwize; 02/22/16 03:51 PM.
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Re: Cam for a 512
[Re: Roadrunner451]
#2017483
02/22/16 04:47 PM
02/22/16 04:47 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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Yes, for sure. This is a new motor though, not the one that ran the 11.48. I'd like to get this one right so I don't have another underachiever.
Besides issues with the exhaust (3" pipe attached directly to the 3 1/2" collector, poor muffler choice) the dynamic compression was pretty low 7.35. I don't remember what the cranking compression was, that was a while ago. The carb was on the small side too. What carb...........that can make or break good 60`s and overall driveability............ On that 451 motor I ran an old Holley 950 HP, which I still have. I also have a Quickfuel 950 with downleg boosters, and an AED 1000Hp with their new wazoo annulars. Any mods done to the carbs to clean em up down low and transition into the cruise then wot?
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Cam for a 512
[Re: Streetwize]
#2017502
02/22/16 05:05 PM
02/22/16 05:05 PM
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Joined: May 2008
Posts: 62 Indianapolis
Roadrunner451
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And if you do need a cam you can regrind the roller you have up to another ~8-10 degrees @.050 and generally +/- 2 degrees on the lobe spread. you'd have to send the core to be sure but generally you can get at least one regrind on a roller Billet...for about a third the cost of another new one. Thanks....I will keep this in mind if, or when, I decide to go to a bigger cam.
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Re: Cam for a 512
[Re: Thumperdart]
#2017505
02/22/16 05:07 PM
02/22/16 05:07 PM
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Joined: May 2008
Posts: 62 Indianapolis
Roadrunner451
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Yes, for sure. This is a new motor though, not the one that ran the 11.48. I'd like to get this one right so I don't have another underachiever.
Besides issues with the exhaust (3" pipe attached directly to the 3 1/2" collector, poor muffler choice) the dynamic compression was pretty low 7.35. I don't remember what the cranking compression was, that was a while ago. The carb was on the small side too. What carb...........that can make or break good 60`s and overall driveability............ On that 451 motor I ran an old Holley 950 HP, which I still have. I also have a Quickfuel 950 with downleg boosters, and an AED 1000Hp with their new wazoo annulars. Any mods done to the carbs to clean em up down low and transition into the cruise then wot? The holley and quickfuel haven't been worked on in those areas. The AED I'm not sure. I contacted them and they asked me a bunch of questions about my car, and said we can make something for you. What all has been done to it I honestly don't know.
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Re: Cam for a 512
[Re: Roadrunner451]
#2017558
02/22/16 06:34 PM
02/22/16 06:34 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
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4500 stall isn't what I would predict from such a big converter. Where does it actually stall, and flash?
Targeting a specific DCR isn't a useful goal, what you want to determine is your knock limit - but that varies quite a bit depending on too many things to pick a specific ratio.
Boffin Emeritus
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Re: Cam for a 512
[Re: polyspheric]
#2017655
02/22/16 09:17 PM
02/22/16 09:17 PM
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Joined: May 2008
Posts: 62 Indianapolis
Roadrunner451
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4500 stall isn't what I would predict from such a big converter. Where does it actually stall, and flash?
Targeting a specific DCR isn't a useful goal, what you want to determine is your knock limit - but that varies quite a bit depending on too many things to pick a specific ratio. About all I can tell you is on the 10" behind my 451 I never saw less than 4500rpm at full throttle. The 9 1/2" I have now I haven't run yet, but I'm kind of hoping for similar results. At least that's what I tried to tell them when I ordered it.
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Re: Cam for a 512
[Re: Roadrunner451]
#2077256
05/20/16 07:34 PM
05/20/16 07:34 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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Just to add a bit more, the heads were shaved a bit to get the C/r up to 11.1 Should work well imo.............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Cam for a 512
[Re: Roadrunner451]
#2077557
05/21/16 09:05 AM
05/21/16 09:05 AM
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Joined: Jan 2003
Posts: 10,088 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Just a wild guess, but IMHO your converter is going to make or break the performance of the motor with this cam. I suspect it will need to be at least a 5000 stall to get the best out of the car. A 9.5 can be set up to stall that high with a motor that big. In the end, testing will tell the tail. I would start with a shift loop and see what it does, and if it is soft on the bottom you have a couple of options. You can try the old cam, or loosen the converter, or both, but not at the same time. If it runs a good MPH I would loosen the converter first. That new cam sure looks to be plenty big, at only a couple of degrees at .050 short of what made 847 hp in my 15/1 528 alky motor, and that motor pulled to 7,000 hard, till it went fat and nosed over.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Cam for a 512
[Re: Roadrunner451]
#2077677
05/21/16 02:52 PM
05/21/16 02:52 PM
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Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
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Bend,OR USA
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Where are you planning on installing the intake lobe centers?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Cam for a 512
[Re: Roadrunner451]
#2078654
05/23/16 03:08 AM
05/23/16 03:08 AM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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Unless things have changed, no..........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Cam for a 512
[Re: Thumperdart]
#2078762
05/23/16 12:09 PM
05/23/16 12:09 PM
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Joined: May 2008
Posts: 62 Indianapolis
Roadrunner451
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Unless things have changed, no.......... That's what I was afraid of. While they worked fine with my old solid roller, I think I was one of the few who had good luck with those in that kind of application. So.....I can take these to work and install a bronze bushing in them without too much trouble. I'm thinking a .030" wall bushing would be fine for this. Would 4640 aluminum nickel bronze work ok for this application ?
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Re: Cam for a 512
[Re: Roadrunner451]
#2078825
05/23/16 02:08 PM
05/23/16 02:08 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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Can`t help ya there but it seems the bodys are not as beefy iirc so maybe it`s more that just bushings to fix em..........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Cam for a 512
[Re: Thumperdart]
#2078919
05/23/16 05:01 PM
05/23/16 05:01 PM
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Joined: May 2008
Posts: 62 Indianapolis
Roadrunner451
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Can`t help ya there but it seems the bodys are not as beefy iirc so maybe it`s more that just bushings to fix em.......... I can't verify this with any actual measurements, but other than the bushing and a black oxide finish they sure look to be the same. At this point I'm not really thrilled with throwing down more money on a new set of rockerarms when my old ones really are pretty decent. I'm going to bush the old ones and run em.
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