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Max CR with BB MP 590 Cam

Posted By: Scott58

Max CR with BB MP 590 Cam - 04/11/11 02:11 AM

Anyone got experience with running over 11:1 on pump gas with the MP 590 cam in a big block (aluminum heads)? If so, what's the CR (and did you measure or guess), what's the installed CL of the cam (I think straight up is 104), what max advance did you run on ignition, and what was your cranking compression gauge reading?

Other pertinent details on you combo would also be appreciated.

Race gas blenders / octane boosters / E-85'ers need not apply, I'm looking for guys running straight 91 or 93 AKI pump gas.

Thanks!

Scott
Posted By: Bob_Coomer

Re: Max CR with BB MP 590 Cam - 04/11/11 02:20 AM

that cam is pretty long in Dur.. think in the 265-268 range@.50..
I ran that cam with a 11:1 493 with mildly ported Eddy RPM's and it ran strong... If your running a stock stroke engine IMO the compression needs to be as high as you can achieve... It will only run bettter. Most say 12-12.5:1+ is idea.. Its just hard to get these compression numbers with stock heads without dome pistons, and shaved heads.
Posted By: dOc !

Re: Max CR with BB MP 590 Cam - 04/11/11 02:46 AM

I would think with a 590 and alum heads ... that the MINIMUM CR you would want is 11 to 1 !
Posted By: Dunnuck Racing

Re: Max CR with BB MP 590 Cam - 04/11/11 03:28 AM

Quote:

that cam is pretty long in Dur.. think in the 265-268 [Email]range@.50..
That camshaft is 271 @050.MP used to tell you it was 265,but they have updated the paperwork finally.
I ran that shaft in a stock stroke 440,9.8 to 1 actual.MP 452 aluminum heads,38 degrees total timing.My cranking compressiion was 165-170.
A good friend of mine runs the same setup,at 11.3 to 1 36 degrees total timing,unknown cranking comp.
Another racer I know runs his at 9.0 to 1 iron headed,38 degrees total.
We all ran(or still run)93 octane pump gas.
Keep in mind,the fuel may be different where you are,most everywhere around here has ethenol in it.
Even the car with the low compression/ iron heads runs real well, he ha one many races and championships in his car.
By the way,I ran mine mine at 104 intake centerline,so did my friend.Not sure on the other guy's build.
Keith
Posted By: deaks

Re: Max CR with BB MP 590 Cam - 04/11/11 10:51 AM

I run the .590 in a 440 with rpm's, 12.5.1 comp, cam in at 104.
I haven't started tuning it yet, i run 34 degrees timing.
Mick
Posted By: Scott58

Re: Max CR with BB MP 590 Cam - 04/11/11 02:53 PM

With pump gas?
Posted By: Dodgem

Re: Max CR with BB MP 590 Cam - 04/11/11 03:26 PM

Friend had that cam in a 446 RPM eddies with 10 to 1 in at 100 and I'm sure he could have ran 87 but he put 94 in it. when we advanced the cam from 104 it picked up a couple tenths and he could leave 1000 rpm less torque at the line.

I ran a 263/271 ultradyne in at 102 for years with 11.75 to 1 SR heads on 94.
Your cranking compression is only going to be 185 ish and I assume a 4500 plus stall. as rpms increase octane requirements decrease.
I would say 93 your fine you may be able to ween it to 91.

This past year I ran 12 to 1 272/282 @ .050 on 94 same heads.
Posted By: shoebox

Re: Max CR with BB MP 590 Cam - 04/11/11 04:14 PM

What spring pressures does that cam require? And whats yall's shift points?Sorry for the hyjack
Posted By: Scott58

Re: Max CR with BB MP 590 Cam - 04/11/11 06:08 PM

I'm using the Isky 8005A spring for this build, 135# on the seat and about 385# over the nose (1.6 rockers), but its a 520 and we won't be reving all that high. I think a lot of people use the Comp 928, puts about 160 on the seat and about 380 at lift.

My situation is that due to a couple of goofs I'm half a point higher on compression than I originally planned to be (11:1 with a catalog gasket), I've got CR choices of 11.1, 11.3 or 11.6 depending on the head gasket (11.6 is with the same gasket I originally planned on for 11:1!). I'm a little shy about the 11.6 on pump gas, so I'm looking for some confirmation / experience before I finish up the build.

Scott
Posted By: Dodgem

Re: Max CR with BB MP 590 Cam - 04/11/11 07:47 PM

Quote:

What spring pressures does that cam require? And whats yall's shift points?Sorry for the hyjack



On my cam with 906 the ultradyne 263/271 we used mopar 077 springs and they were about 150 on the seat sifted 6600 to 6800.

Then put on Indy SR's with the springs that come with them good to .650 lift think they were about 160 seat new and after 5 years were 150 ish and would shift it 7000 to 7200

On the 590 in my buddies not sure but they were a mopar spring
before buddy sold it we check and his seat pressure was 120 and it never floated at 7000 shifts but over the top they were almost 600 really multypied up.
used the stock eddie springs a first and they were fine?? good to .600 lift??
Posted By: 6bblFLASH

Re: Max CR with BB MP 590 Cam - 04/11/11 08:42 PM

I run a .590 installed at 106-c/l. 1.6 ratio rockers,Stage-6 heads w/63cc. chambers.
I run 93 umleaded ONLY .
My compression comes out with a measured assembled engine at exactly 12.34cr.
#4 cyl. try and does detonate if I try to use a 2-step. But thats a manifold issue.

Attached picture 6580015-QuakerWheelie.jpg
Posted By: shoebox

Re: Max CR with BB MP 590 Cam - 04/11/11 10:30 PM

Id love to use that cam with mysprings 130/330 pressures but idunno ifwould work
Posted By: '72CudaRacer

Re: Max CR with BB MP 590 Cam - 04/11/11 11:07 PM

I run that cam straight up (104*) with 13.6:1 compression. I have Ross domed pistons, Stealth heads, Team G intake, 1050 Dominator (8896), MP roller tipped alum rockers w/ 1.5 ratio, and Sunoco 112 racing fuel. This combo is almost 600 hp and I did break a main cap after 300 passes. I put a main stud girdle on last week and ran this weekend, 10.49 in 1/4 and 6.56 in 1/8. When I advanced this cam 2*, it had way too much torque. I am running 35* timing
If you need any more info about mine, just ask, I'll help as much as I can.

Brian Dunnigan
Posted By: ProSport

Re: Max CR with BB MP 590 Cam - 04/12/11 01:00 AM

I ran the 590 cam in my old car with Isky 8005a springs, cam in at 104, compression was 11.2:1, car was 3050# with me in it. It went 9.90's in the 1/4 at 136 MPH. Great street strip cam! I had 451 cubes and Eddy heads, M1 TR with 2 750's. Current owner has gone 9.77 thru the muffs!
Posted By: shoebox

Re: Max CR with BB MP 590 Cam - 04/12/11 03:09 AM

Quote:

I ran the 590 cam in my old car with Isky 8005a springs, cam in at 104, compression was 11.2:1, car was 3050# with me in it. It went 9.90's in the 1/4 at 136 MPH. Great street strip cam! I had 451 cubes and Eddy heads, M1 TR with 2 750's. Current owner has gone 9.77 thru the muffs!



What was shift point?
Posted By: '72CudaRacer

Re: Max CR with BB MP 590 Cam - 04/13/11 01:38 AM

I shift at 6200. 1/4 mile trap rpm is 6800-6900.

Brian
Posted By: sixpackgut

Re: Max CR with BB MP 590 Cam - 04/13/11 01:50 AM

493, 10.5cr, 185 cranking comp, 93 pump gas, installed at 105. rpm heads, six pack, ran 10.50s at 3700lbs, shifted at 5800, used the isky's 8005a also
Posted By: 383man

Re: Max CR with BB MP 590 Cam - 04/13/11 05:25 AM

Quote:

I ran the 590 cam in my old car with Isky 8005a springs, cam in at 104, compression was 11.2:1, car was 3050# with me in it. It went 9.90's in the 1/4 at 136 MPH. Great street strip cam! I had 451 cubes and Eddy heads, M1 TR with 2 750's. Current owner has gone 9.77 thru the muffs!





That was a great running combo. Ron
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