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Cam,, Voodoo or somthing else |
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chris989
AMC Apprentice Joined: Jun/04/2014 Location: boise Status: Offline Points: 63 |
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Posted: Sep/16/2018 at 10:14pm |
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Hello all,
360, 11-1, Edlebrock heads lunati 10100702 .507"/.527" 220/226 @.050 262/268 air gap MSD ported manifolds,, soon to be headers. bla bal bla I am considering swapping in a different cam while I have the motor out for some other business. the 702 grind runs out of steam ~5000. I thought of going lunati 703 grind 527"/.547" 226/234 268/276 but with the heads, they don't flow any more at .600 vs .500 of lift. I see in the Isky catalog their 280 mega has a much lower lift (below .500). Any insight?? Thanks, Chris |
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danalog
AMC Apprentice Joined: Dec/02/2017 Location: New Hampshire Status: Offline Points: 100 |
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If you have edelbrock heads then I might suggest going with the edelbrock performer cam. I have heard great reviews on it and when I get the chance when the engine's pulled out, I might swap one in there. As for lunati, I have actually never heard of the brand before so I can't give you much insight on that. How much RPM are you hoping for?
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1972 Javelin-AMX. 360-4v/727.
Butterscotch Gold (D5) |
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motorhead_1
AMC Addicted Joined: Apr/16/2014 Location: AZ Status: Offline Points: 1005 |
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not enough info
how do you plan to use the car? street? strip? autox? parades? tire size? trans? do you need vacuum for power brakes? call a cam grinder and get one tailored for you car the way you intend to drive it instead of off the shelf
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69 SC/Rambler tribute 401/th400, 68 Rebel SST LSA, 66 F100 460/c6, 88 Merkur Xr4Ti, 71 Jaguar XJ6 LS1, 08 Supercharged Tundra
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Stock heads have a 30 degree intake valve angle,
Eddy's have a 45 degree. The 45 degree angle trades some low lift flow for better high lift flow. For that reason alone I'd want to go with a little more lift with the Eddy heads, you sacrificed some low lift flow for high lift flow already, you might as well use it. Lower lift cams are generally easier on the valvetrain, less wear and tear, less aggressive lobes, less spring pressure needed, but the trade off is you're not getting all the flow you could be getting, especially with our large .904 lifters that tolerate more aggressive lobes better than smaller diameter lifters. Lunati makes good cams, their Voodoo series uses modern, aggressive lobes. I like their Street/Strip series, but they're not .904 lifter specific lobes. Howards has a lot of AMC friendly lobes for decent prices as well. Even a custom cam from Howards is inexpensive. |
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Does it need to run power brakes?
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1968 AMX 390 w/T5
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chris989
AMC Apprentice Joined: Jun/04/2014 Location: boise Status: Offline Points: 63 |
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thanks for the replies,
yes,, i do have power brakes. The set up is in a cj7, 35 tires, 456 gears, 904 trans, and it is purely for fun, DD and some wheeling. 5800 rpm is about the most i would want to spin it. I guess a better question would be if anyone is running something like an Isky 282 /.517. I spoke with them today and might go that direction. I don't need the extra lift if the opening event is equal in duration. As in if an isky reaches .500 and stays open the same as the luntai, I could care less if it continues to open even further. The heads have a diminishing return after .500
Considering Moab and Tahoe are hours of highway driving I am looking for something more forgiving on my valvetrain. The .527 is about as big as i would like to go for that. |
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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I agree that the Edelbrock heads level off at the .500 point (according to the manufacturer's info), but the higher lift cams, .527", .540", .555", whatever are going to spend a higher percentage of their time above the .300-.400 range than the smaller cams that are under .500" lift. You don't *need* .550" or whatever lift, but that over .500" cam will be in the heads sweet spot longer than the .497 cam will be. A nice, wide flat nose cam that peaks out at .500" would be great, but most cams aren't shaped like that, so the lower lift cams also have much lower lifts as you go down towards the base of the lobe. Some more .050" duration over what you have now should do what you're looking for, I just like the higher lift cams because they provide more lift everywhere throughout the duration of the cam.
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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chris989
AMC Apprentice Joined: Jun/04/2014 Location: boise Status: Offline Points: 63 |
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[/QUOTE] I agree that the Edelbrock heads level off at the .500 point (according to the manufacturer's info), but the higher lift cams, .527", .540", .555", whatever are going to spend a higher percentage of their time above the .300-.400 range than the smaller cams that are under .500" lift. You don't *need* .550" or whatever lift, but that over .500" cam will be in the heads sweet spot longer than the .497 cam will be. A nice, wide flat nose cam that peaks out at .500" would be great, but most cams aren't shaped like that, so the lower lift cams also have much lower lifts as you go down towards the base of the lobe. Some more .050" duration over what you have now should do what you're looking for, I just like the higher lift cams because they provide more lift everywhere throughout the duration of the cam. [/QUOTE]I spoke with crane this morning and like the others, no one has profile number they are willing to share, (lift @ .200/300/400/500). I guess that would be giving away their "secrets". I'm with you about the time under 500. If the cam only spends 1 degree of duration at 500 the rest of the duration will not be in the heads sweet spot. I will continue to look around, it would be nice if they offered a duration @ max lift number to go along with the .050. Chris |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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This should help -
It's a graphical comparison of the combined cylinder head and cam capacity for each cam, and then the numbers below the graph indicate the difference in area under the curve between the two. The Voodoo cam has a really aggressive lobe profile, so even though you're increasing the duration with the Isky 280 the overall flow area decreases by 1.4% on the intake. The exhaust area under the curve drops even more % because the Isky 280 is a single pattern cam, and the Edelbrock heads are tailored more for dual pattern cams with wider exhaust lobes. You can see the overlap triangle in the middle is much larger with the Isky 280, so the rpm band will move upward as you wanted, though it might actually reduce the power output. |
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1968 AMX 390 w/T5
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chris989
AMC Apprentice Joined: Jun/04/2014 Location: boise Status: Offline Points: 63 |
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The graph is awesome, Where did you find the info or software to imput the number?
Chris |
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