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SPRING PRESSURE ON MOPAR .590 CAM #663835 04/07/10 06:37 PM 04/07/10 06:37 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	i have got RPM springs with inners for my old motor which had a R280 roller cam, is this too much and if so, will the RPM springs without the inners be sufficent. Mick

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663836 04/07/10 06:56 PM 04/07/10 06:56 PM
Joined: Feb 2007 Posts: 5,080 organ M maximum entropy master
maximum entropy master M Joined: Feb 2007 Posts: 5,080 organ	that would be too much with the inners imo. that cam is next on my list, and i'm going to run it with a fresh set of rpm springs. i've had very good luck with those springs on similar cams. for what is the good life if not doing things thoughtfully?

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663837 04/07/10 09:25 PM 04/07/10 09:25 PM
Joined: Jan 2003 Posts: 16,925 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,925 NC	Depending on valve train weights (including valves), and desired RPM, roughly 135 lbs seat and 370 lbs open is in the ball park.

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663838 04/07/10 09:27 PM 04/07/10 09:27 PM
Joined: Jan 2003 Posts: 17,918 Akron, Ohio ProSport I Live Here
ProSport I Live Here Joined: Jan 2003 Posts: 17,918 Akron, Ohio	I ran the Isky 8005a springs with the 590 cam with good luck, also used 1.6 rockers. 1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: ProSport] #663839 04/07/10 09:43 PM 04/07/10 09:43 PM
Joined: Mar 2007 Posts: 3,300 Northern Indiana Dunnuck Racing master
Dunnuck Racing master Joined: Mar 2007 Posts: 3,300 Northern Indiana	We run Comp #928 springs with that cam,using the stock Edelbrock installed height.The are a direct swap for the stock Edelbrock springs.It is a good idea to upgrade the retainers and locks,but you probably already did with a roller? www.dunnuckracing.com

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: Dunnuck Racing] #663840 04/08/10 05:30 PM 04/08/10 05:30 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	I've just checked the springs they are 190 seat, stock eddy valves, isky 1.5 solid rockers. I dont really want to buy another set as i also need new push rods, a converter and a new set of slicks and the money is running out. I've got a spare set of brand new stock eddy springs, they claim they are good to .600 lift on their website. Jim I will shift at 6200 and maybe 6700 or so through the 1/4 mile. prosport I cant find them on isky's website, do you know what spring pressure they are. Mick 4.56 gears and 31" slicks. Mick

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663841 04/08/10 08:40 PM 04/08/10 08:40 PM
Joined: Jan 2003 Posts: 16,925 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,925 NC	Quote: I've just checked the springs they are 190 seat, stock eddy valves, isky 1.5 solid rockers. I dont really want to buy another set as i also need new push rods, a converter and a new set of slicks and the money is running out. I've got a spare set of brand new stock eddy springs, they claim they are good to .600 lift on their website. Jim I will shift at 6200 and maybe 6700 or so through the 1/4 mile. prosport I cant find them on isky's website, do you know what spring pressure they are. Mick 4.56 gears and 31" slicks. Mick IMO, the springs you have will risk wiping the solid lifter cam. With only 6700, you might be fine with 340 open, but I still like 130-140 seat.

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: ProSport] #663842 04/08/10 09:03 PM 04/08/10 09:03 PM
Joined: Jul 2004 Posts: 4,384 Worst Weather USA 493_DART master
493_DART master Joined: Jul 2004 Posts: 4,384 Worst Weather USA	Quote: I ran the Isky 8005a springs with the 590 cam with good luck, also used 1.6 rockers. thats what i use. i think they are about 400lbs open .

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: 493_DART] #663843 04/08/10 10:29 PM 04/08/10 10:29 PM
Joined: Oct 2003 Posts: 3,698 NE Oklahoma V Von master
Von master V Joined: Oct 2003 Posts: 3,698 NE Oklahoma	Quote: Quote: I ran the Isky 8005a springs with the 590 cam with good luck, also used 1.6 rockers. thats what i use. i think they are about 400lbs open . I have them also. But, I dont think they are near 400 open, more like 330-350. Looks like they are 135 on the seat at 1.875. 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.

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: Von] #663844 04/09/10 11:18 AM 04/09/10 11:18 AM
Joined: Jan 2003 Posts: 16,925 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,925 NC	From Isky web site: http://www.iskycams.com/springbook.pdf 125 at 1.900" 145 at 1.850" So at 1.88" that would be about 133 lbs seat And at 0.590" lift from 1.88, ie 1.29" open 365 at 1.300" 385 at 1.250" So at 1.29" that would be about 361 lbs open

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: 440Jim] #663845 04/09/10 02:49 PM 04/09/10 02:49 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	I'm going to try the edelbrock singles, i currently run 29.5 slicks with a 4.56 gear but I'm fitting 31" slicks to keep the revs down a little.

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663846 04/09/10 03:10 PM 04/09/10 03:10 PM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	Mick, check the open pressures(all of them) on those roller springs. I would break in the cam in with the Eddy springs and then, if the open pressues is not over 400 lbs, swap the roller springs into the motor. I run 165 to 190 lbs. on the seats and shoot for 375 to 425 lbs open, but you should absolutely break the new cam in with less pressures Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: Cab_Burge] #663847 04/09/10 03:51 PM 04/09/10 03:51 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	HI Cab The cam is already broken in and the heavier springs are still on at the moment, i've just clayed the heads again and the clearance seems ok, just need some longer puhrods and i will finish putting it together. I've also got a .625 herbert roller i might try later, just want to try the .590 first to see if it deserves it's reputation. Mick

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663848 04/09/10 03:54 PM 04/09/10 03:54 PM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	Quote: just want to try the .590 first to see if it deserves it's reputation. Mick Good luck Mick, is this one of the early "590" with .590 net lift at the retainers with the lash set or one of the later ones that doesn't have .590 net lift at the retainers? Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: Cab_Burge] #663849 04/09/10 04:58 PM 04/09/10 04:58 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	I dont know Cab, i didn't realise there was more than one. Jim Thanks for the info. Mick

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663850 04/10/10 07:59 AM 04/10/10 07:59 AM
Joined: May 2004 Posts: 854 Brisbane Australia 5 572B1 super stock
572B1 super stock 5 Joined: May 2004 Posts: 854 Brisbane Australia	Crane dual springs, eight years of street and strip. bullet proof.

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663851 04/10/10 09:17 AM 04/10/10 09:17 AM
Joined: Jan 2003 Posts: 16,925 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,925 NC	Quote: I'm going to try the edelbrock singles, What pressures do your springs measure? I have seen people report significantly different values over the years. So, maybe Edelbrock changed springs at some point.

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: 440Jim] #663852 04/10/10 03:12 PM 04/10/10 03:12 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	I have nothing to measure them pressure wise but the eddy site claims they are good up to .600 lift, so rather than wipe the cam i'll try them and if they dont work out, i'll get my wallet out again. Mick

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: deaks] #663853 04/11/10 12:47 PM 04/11/10 12:47 PM
Joined: Jan 2003 Posts: 16,925 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,925 NC	I think if you took them to a shop to measure the Edelbrock RPM valve spring pressures, they would be around 120 seat (1.88). I can't guess at the spring rate and open pressure. But like I said, many reported differences over the years. The danger with too little spring pressure is valve float and the resulting valve train damage. It could be mild, or could ruin the valve seat sealing, bend pushrods, break rockers, not to mention weaken the springs. If a retainer or locks(keepers) let go, it could swallow a valve. I would be careful.

Re: SPRING PRESSURE ON MOPAR .590 CAM [Re: 440Jim] #663854 04/11/10 01:40 PM 04/11/10 01:40 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	Thanks Jim I still have to buy pushrods, new slicks and a converter yet, so money is getting a little tight. I will try it with the 6500 chip first, shift at 6200. If work picks up a little more, then i'll buy the springs sooner. Mick

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