Cam changes or not.
#1131652
12/11/11 01:12 PM
12/11/11 01:12 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
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super stock
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OP
super stock
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Posts: 862
Iowa State fan
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BB 440 at 40 over. running eddy heads w 84cc chamber untouched, but harland sharp rockers. Should be right at 10:1 pistons were .007 down when motor was assembled. Street dominator and a TQ for intake. Homemade smallish headers w 3"exh and a X pipe all exits out the rear. 4speed, 3.55 rear. aluminum flywheel. Motor crank compression checked at 147-150 cold on all cylinders in current config. Right now I currently am running a mopar P4120655 cam the ".557" cam. I couldnt find the intake and exhaust events to link to so someone will have to supply them to me if they have them. But I remember it being somewhere around 252* at .050 but at a outlandish .028/.032 lash. I also have a comp cam Comp Cam 21-247-4 that I could use. The link has the intake/exh events but its only a 236* at .050 cam which is CONSIDERABLY smaller. Also being that they are solid cams they act smaller than a respective hyd cam by about 10*, or so Ive been told. 1)What Im looking for is a more Cranking Compression and some more torque. The motor really really move about 6000-7000rpm but we all know on the street about those rpms. I have all the hardware to run either and can step up on valve springs to if I needed but the motor seems not to float now so... 2)Im also contemplating a backward step to HP exh manifold for the more look stock go for the kill on the street.. I currently dont race (kids, mortgage, etc) but I still love to drive my car. 3)Will I be losing a LOT on the top or will the bottom make up for. 4)Or will I really not be waking it up on the bottom that much? I know its my style and driving habits but Just wonder what some Moparts opinions might be.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Cam changes or not.
[Re: kilroy]
#1131653
12/11/11 01:51 PM
12/11/11 01:51 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Could only find adv dur 296/296 overlap 76 centerline 110 lift .557/.557 lash 29/32 basic rpm 3400-7200 drag pro comp manual and high stall automatic. P4120655 EDIT Yes I'd go with a much smaller cam (not sure which/not a cam guy) and for now is your dizzy dialed in. You should be able to run a very agressive curve. What fuel and yes that is a low cranking compression #
Last edited by RapidRobert; 12/11/11 01:56 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Cam changes or not.
[Re: Pacnorthcuda]
#1131655
12/11/11 03:26 PM
12/11/11 03:26 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
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Ya Ive got the distributor dialed. Ya the car on a serious street diet thought. The only iron left is the rotating assembly and the block (engine wise that is). Ive cut at least 200-300 lbs off the exterior too. Still looking to loose more but Ive taken the "easy" big weight out.
Not bad on the street at all, just soft on the bottom end. Can I call cam events using specs given? Ive plugged the small cam into a dynamic CR calc but without the intake closing event I cant calc the big one.
How much tire frying ability ya think Ill gain to be Neanderthalic about it?
Last edited by kilroy; 12/11/11 03:27 PM.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Cam changes or not.
[Re: kilroy]
#1131656
12/11/11 03:38 PM
12/11/11 03:38 PM
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Joined: Nov 2007
Posts: 21,825 Kirkland, Washington
Pacnorthcuda
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Posts: 21,825
Kirkland, Washington
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Quote:
How much tire frying ability ya think Ill gain to be Neanderthalic about it?
Where does your powerband start now? (Whats the lowest RPM that you can roll into the throttle quickly, in gear, without a bog, and have it pull hard).
If its much over about 2500 then I'd say you can gain a LOT!
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Re: Cam changes or not.
[Re: kilroy]
#1131657
12/11/11 04:13 PM
12/11/11 04:13 PM
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Joined: Mar 2007
Posts: 3,300 Northern Indiana
Dunnuck Racing
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master
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Posts: 3,300
Northern Indiana
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Your .557 camshaft should actually measure in at 257@.050. You would be making a pretty large change going to the Comp grind you are looking at. It's probably not a bad choice,but you will limit the top end quite a bit compared to the MP grind. But it really depends on what you want to accomplish. Do you know where the installed centerline of the MP cam ended up? They recommend it in at 108,but with a street car I like to advance it a couple more degrees. I always thought that grind made pretty decent torque,so I was wondering if it was unintentionally installed a couple degrees retarded now? Keith
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Re: Cam changes or not.
[Re: Dunnuck Racing]
#1131658
12/11/11 04:25 PM
12/11/11 04:25 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
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no i degreed it in at 4* advance. any ideas on low Cranking comp?
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Cam changes or not.
[Re: kilroy]
#1131661
12/11/11 04:35 PM
12/11/11 04:35 PM
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Joined: Nov 2007
Posts: 21,825 Kirkland, Washington
Pacnorthcuda
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Posts: 21,825
Kirkland, Washington
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Quote:
Quote:
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How much tire frying ability ya think Ill gain to be Neanderthalic about it?
Where does your powerband start now? (Whats the lowest RPM that you can roll into the throttle quickly, in gear, without a bog, and have it pull hard).
If its much over about 2500 then I'd say you can gain a LOT!
I have the carb and distb. dialed, I can roll into it at any Rpm, its just not absolute tire frying. I am running 3.55 w/ a 275/60/15 but they are just street tires. I have a homemade caltrac style suspension w/ hd springs so ireally dont think im that stuck to the ground.
Interesting, I have a 70 'Cuda, 440 4speed, 3.55 275/60/15 with caltracs on HD Springs! Lunati 60303 cam (268/274, .493/.513 hydraulic) and I can't trottle under 1900-2000 RPM, but once above that point its an easy burn em as long as you want.
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Re: Cam changes or not.
[Re: kilroy]
#1131663
12/11/11 04:38 PM
12/11/11 04:38 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Romeo MI
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Quote:
no i degreed it in at 4* advance. any ideas on low Cranking comp?
Whats the LSA on that cam and did you degree it when you put it in or did you just use the 4* advanvce on the gear set.... it sounds like you have it in retarted
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Re: Cam changes or not.
[Re: Pacnorthcuda]
#1131665
12/11/11 05:04 PM
12/11/11 05:04 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
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Quote:
Quote:
Quote:
Quote:
How much tire frying ability ya think Ill gain to be Neanderthalic about it?
Where does your powerband start now? (Whats the lowest RPM that you can roll into the throttle quickly, in gear, without a bog, and have it pull hard).
If its much over about 2500 then I'd say you can gain a LOT!
I have the carb and distb. dialed, I can roll into it at any Rpm, its just not absolute tire frying. I am running 3.55 w/ a 275/60/15 but they are just street tires. I have a homemade caltrac style suspension w/ hd springs so ireally dont think im that stuck to the ground.
Interesting, I have a 70 'Cuda, 440 4speed, 3.55 275/60/15 with caltracs on HD Springs! Lunati 60303 cam (268/274, .493/.513 hydraulic) and I can't trottle under 1900-2000 RPM, but once above that point its an easy burn em as long as you want.
Wow check your cam specs out and it closes 28* earlier than either of my cams!!! I supposes that the difference between a hyd and a mech cam?
Plug that in to this dynamic CR calc makes the motor look 40psi better 1.35 better on dcr. Looks like a real hero now
Last edited by kilroy; 12/11/11 05:05 PM.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Cam changes or not.
[Re: RapidRobert]
#1131667
12/11/11 08:46 PM
12/11/11 08:46 PM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
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Memphis
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I also think you'd be much happier with the smaller cam. The Comp cam is about the size of one I'm runnin in my 10>1 eddy headed 451 and it works REAL well on the street. Will smoke street tires for blocks.
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: Cam changes or not.
[Re: HemiRick]
#1131668
12/11/11 09:26 PM
12/11/11 09:26 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
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Balt. Md
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I ran the MP .557 in my old 440 combo and I really liked it. But I degreed my cam in and put it on a 104 centerline setting using my degree wheel. It ran 11.49 @ 116 best in my 63 at 3700 lbs with 906 heads and the Holley SD intake. It had 10.0 comp. Never even checked cranking comp since it ran so good. That is a nice size cam but you need to degree it in with the degree wheel since it is a large enough cam that it will make good hp but if not set right it can hurt the low end as any large enough cam can do in the wrong combo. I think it would work good in your combo if set right and it needs enough comp. Ron
Last edited by 383man; 12/11/11 09:43 PM.
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Re: Cam changes or not.
[Re: 383man]
#1131669
12/11/11 09:53 PM
12/11/11 09:53 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
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Yes everyone I said I degreed it in. Its just been 2 years and I cant remember the specs, Ive seen those damn degree notches on chains if not checked be off by 10*!!!! Just a warning to others FYI. Thanks though Ill double check it this winter sometime just to make sure good but it was 2 years ago.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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