This cam w/power brakes-general street manners
#272132
03/30/09 11:30 PM
03/30/09 11:30 PM
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Joined: Feb 2003
Posts: 381
Denver CO
bennydodge
OP
enthusiast
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OP
enthusiast
Joined: Feb 2003
Posts: 381
Denver CO
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Anybody here try this solid flat tappet cam before?: Lunati #404A3LUN
Advertised duration(int/exh): 282/282
Duration at .050: 255/255
Valve lift: .582/.582
LSA/ICL: 108/102
Valve lash: .016/.016
RPM range: 3500-7200
This would be going in my 416 stroker SB w/11.5 to 1 comp., Eddy heads. Lunati says it's the "largest cam recommended for a daily driver". I want to run 3.23 gears with it also. I've also got power brakes. What do you guys think? Lunati also recommends some fairly mild springs too- 120lbs closed 265lbs open. Doesn't seem right. Anyone try this setup before? I'm really leaning towards trying this cam since I already have it. Opinions are not only welcomed, they are encouraged.....
73 Challenger 340(416),E-heads, 727, 3.23 SG
2015 Challenger R/T classic B5, wife's car
2010 Ram 3500 Crew Cab SLT dually 4X4
2016 Challenger Hellcat Redline Red A8
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Re: This cam w/power brakes-general street manners
[Re: bennydodge]
#272134
03/31/09 12:33 AM
03/31/09 12:33 AM
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Joined: Apr 2007
Posts: 1,261
ILL
mark7171
pro stock
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pro stock
Joined: Apr 2007
Posts: 1,261
ILL
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[Email]255@.050[/Email] duration... and you want to turn a 3.23 ? You are depending on your crank throw to spin the difference.
That cam would like 4.10 + in the rear. Not for driving around with your buddies either. Might be a fun drag car.
For the street cams stay around .440-.460 lift.
Last edited by mark7171; 03/31/09 12:35 AM.
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Re: This cam w/power brakes-general street manners
[Re: mark7171]
#272135
03/31/09 04:51 AM
03/31/09 04:51 AM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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not sure on how the hydraulics compare to the solids...I've been told yo ucan't make a direct comparison...
but I have a 275 advertised duration, 235ish @ .050, .525 total lift, and it had enough vacuum for brakes, but its also in a "low deck 440."
I did have it with a 3.23 gear, and I could never use 5th gear, with 4th gear being 1:1 and 28.5" tall tires, It would turn 2300 or so at 60. shift into 5th and I had to drive faster than 70MPH to get it so it would stop surging and lugging.
Also had to slip the clutch a lot just to get going, and it made for very painful, slow parking lot driving.
**Photobucket sucks**
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Re: This cam w/power brakes-general street manners
[Re: bennydodge]
#272137
03/31/09 09:46 AM
03/31/09 09:46 AM
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Joined: Jan 2003
Posts: 3,905
Minnesota
3twos
master
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master
Joined: Jan 2003
Posts: 3,905
Minnesota
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I can't imagine this cam would have enough vacumn for power brakes. You may want something with less duration if it is a street car, especially with 3.23 gears.
Al & Sheila
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Re: This cam w/power brakes-general street manners
[Re: mark7171]
#272140
03/31/09 11:48 AM
03/31/09 11:48 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
[Email]255@.050[/Email] duration... and you want to turn a 3.23 ? You are depending on your crank throw to spin the difference.
That cam would like 4.10 + in the rear. Not for driving around with your buddies either. Might be a fun drag car.
For the street cams stay around .440-.460 lift.
um, lift really is only a secondary/tertiary spec when it comes to drivability. duration determines powerband range, and that is variable depending on size of the motor and compression.
a [Email]255@.050[/Email] degree solid will be comparable (after lash) in manners as a [Email]240-245@.050[/Email] hydraulic. the "3500-7000" RPM powerband really is bogus, the cam & powerband will be COMPLETELY different in say an 8:1 273 or 318 than in a 11.5:1 408. given it's a symmetrical camshaft, you also have a little less overlap (66 degrees) than if you had a dual pattern cam.
personally I think it'll be a pretty good cam for your combo (high compression, big cubes). IIRC GmachinedartGT is running a [Email]250-255@.050[/Email] solid roller in his eddie headed 408 dart with 2.94 gears and it works great for him, can keep up with freeway traffic at reasonable RPM's, IIRC gets close to 18mpg on the highway, all while being able to click off low 12 second quarters...
I think you'll be fine for a hot street car, I'd swagger probably around 9" vaccuum in gear, which should be fine for PB....if you wanted to try get a little better low RPM manners out of it, you could run a looser lash (effectively making it appear a few degrees smaller) or maybe install it at 100 ICL instead of 106. with that much compression you might need the extra duration of the cam to kill off a little cylinder pressure so you don't get into detonation with pump gas. might want to post this question in the race forum for some other points of view.
Last edited by patrick; 03/31/09 11:50 AM.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: This cam w/power brakes-general street manners
[Re: patrick]
#272141
03/31/09 12:07 PM
03/31/09 12:07 PM
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Joined: Jan 2004
Posts: 755
Tempe, AZ
loco340cuda
super stock
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super stock
Joined: Jan 2004
Posts: 755
Tempe, AZ
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I have a MP 484 cam (241/241 dur @0.50, .484/.484 lift, 108 lsa) in my 9.5:1 417 stroker. I have power brakes and it pulls about 11" of vacuum. I would say 98% of the time the brakes work just fine and I feel comfortable driving the car. You just have to be careful with the stop and go driving in heavy traffic due if the vacuum in the booster is low from a previous brake and has not built back up it is much more difficult to stop the car in an emergency type situation. But like I said 98% of the time not a problem. Also I have 3.91 gears in my 4-speed 70 Cuda and it is a really blast to drive.
70 Cuda 340 4 speed - now stroked to 416ci (SOLD)
2017 Mustang Shelby GT350
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Re: This cam w/power brakes-general street manners
[Re: patrick]
#272142
03/31/09 05:51 PM
03/31/09 05:51 PM
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Joined: Feb 2003
Posts: 381
Denver CO
bennydodge
OP
enthusiast
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OP
enthusiast
Joined: Feb 2003
Posts: 381
Denver CO
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Quote:
Quote:
[Email]255@.050[/Email] duration... and you want to turn a 3.23 ? You are depending on your crank throw to spin the difference.
That cam would like 4.10 + in the rear. Not for driving around with your buddies either. Might be a fun drag car.
For the street cams stay around .440-.460 lift.
um, lift really is only a secondary/tertiary spec when it comes to drivability. duration determines powerband range, and that is variable depending on size of the motor and compression.
a [Email]255@.050[/Email] degree solid will be comparable (after lash) in manners as a [Email]240-245@.050[/Email] hydraulic. the "3500-7000" RPM powerband really is bogus, the cam & powerband will be COMPLETELY different in say an 8:1 273 or 318 than in a 11.5:1 408. given it's a symmetrical camshaft, you also have a little less overlap (66 degrees) than if you had a dual pattern cam.
personally I think it'll be a pretty good cam for your combo (high compression, big cubes). IIRC GmachinedartGT is running a [Email]250-255@.050[/Email] solid roller in his eddie headed 408 dart with 2.94 gears and it works great for him, can keep up with freeway traffic at reasonable RPM's, IIRC gets close to 18mpg on the highway, all while being able to click off low 12 second quarters...
I think you'll be fine for a hot street car, I'd swagger probably around 9" vaccuum in gear, which should be fine for PB....if you wanted to try get a little better low RPM manners out of it, you could run a looser lash (effectively making it appear a few degrees smaller) or maybe install it at 100 ICL instead of 106. with that much compression you might need the extra duration of the cam to kill off a little cylinder pressure so you don't get into detonation with pump gas. might want to post this question in the race forum for some other points of view.
These were my thoughts as well, Patrick. When I had the MP .474" hyd. cam in this same combo it made torque like my Cummins diesel, so I'm thinking I can run a cam this aggressive with these gears and get away with it.
Anybody else wanna' chime in?
73 Challenger 340(416),E-heads, 727, 3.23 SG
2015 Challenger R/T classic B5, wife's car
2010 Ram 3500 Crew Cab SLT dually 4X4
2016 Challenger Hellcat Redline Red A8
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