Re: Help me select a cam
[Re: DGS]
#1598814
03/26/14 09:17 PM
03/26/14 09:17 PM
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Joined: Feb 2005
Posts: 4,333 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,333
Prospect, PA
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Quote:
440 with 915 heads = higher than stock compression
Can you be specific?
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Re: Help me select a cam
[Re: DGS]
#1598815
03/26/14 10:01 PM
03/26/14 10:01 PM
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Joined: Mar 2005
Posts: 3,164 Central NC
gch
master
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master
Joined: Mar 2005
Posts: 3,164
Central NC
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Quote:
Need some help for selecting a new cam for my 70 Charger.
Here is what I have:
440 with 915 heads = higher than stock compression 3.23 SG rear end (won't change since I do some long distance trips) intake: Holley Street Dominator or Edelbrock Performer RPM carb: Quickfuel 750 vacuum secondary or 850 Thermoquad cheap headers current cam: Mopar .509 A-833 4-speed (2.66 first) tranny
Should I go for an off the shelf cam or a custom cam? Any recommendations?
Thanks
Max performance I would sar rpm intake and quickfuel 750 Max mileage I would say Thermoquad but w/o street dominator.
Street dominator is an excellent intake but I would rather have a dual plane in a heavy car with 3.23 gears.The standard performer would work but would sacrifice some mid range/top end.
Are you going to run the stamped stock rocker arms or aftermarket roller/adjustable?? We do need to know your actual compression and whether any work has been done to the heads for a specific recommendation.
Off the shelf stuff I would say somewhere in the high 220's/low 230's on the intake duration at .050.
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Re: Help me select a cam
[Re: DGS]
#1598821
06/27/14 07:19 PM
06/27/14 07:19 PM
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Joined: May 2004
Posts: 270 Washington, IL
Hughes
enthusiast
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enthusiast
Joined: May 2004
Posts: 270
Washington, IL
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Shoot me an e-mail at kevin@hughesengines.com with the answers to as many of these questions as possible and I will help you pick one out. Engine size (cubic inch displacement) Weight of vehicle, with driver (if a driver is used) What category does your use fit? 1 thu 8 See below. Altitude where vehicle will be run. Desired ET or MPH Present camshaft (duration @ .050", Lobe separation angle, lift etc...) Final gear ratio Stall speed of torque converter Tire height and width Fuel type Static or Mechanical compression ratio Iron or aluminum heads Measured Compression Ratio Intake manifold Header type and size Carburetor size Rocker arm type and ratio Will power adders be used? (N.O.S., turbo, supercharger etc...) Cylinder head air flow numbers
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Re: Help me select a cam
[Re: DGS]
#1598822
06/27/14 07:55 PM
06/27/14 07:55 PM
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Joined: Jan 2007
Posts: 7,664 IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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Quote:
Thanks guys. Unfortunately I don't know the exact compression ratio - engine was rebuilt in the past but previous owner didn't what was done to the engine. Not stuck on a hydraulic grind but I would like some more vacuum than with the 509. I have a set of BB max wedge adjustable rocker arms on the shelf - not a true 1.5 more like 1.45 I've been told. Would these work or should I get a different set of rocker arms?
On the rockers, I think those (iron adjustables I assume) would work fine if in good shape. The iron rockers need a shaft with correct hardness. If you are not sure about yours, new shafts recommended by the cam supplier would be good insurance. The shafts Comp supplies with their cast steel rockers would be fine also.
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Re: Help me select a cam
[Re: Dunnuck Racing]
#1598824
06/27/14 10:27 PM
06/27/14 10:27 PM
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Joined: Jan 2003
Posts: 21,122 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,122
Niles , Ohio
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IIRc a member Dwayne Porter will also grind you a custom cam.I believe Ron 383 Man used his cam.He will make you one that works.Rocky
Chrysler Firepower
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Re: Help me select a cam
[Re: DGS]
#1598828
06/30/14 02:56 PM
06/30/14 02:56 PM
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Joined: Jan 2003
Posts: 1,793 Windsor, ON, Canada
Diplomat360
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,793
Windsor, ON, Canada
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What are your goals in the NEW cam as compared to what you have right now? Sounds like you are looking to stick with something right for the gear ratio you have (if I'm reading the posts correctly). I second the 230@0.050 recommendation...beyond that you may want to play with the LSA and so forth to smooth out the idle and drive for more vacum at lower RPM.
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