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Re: Cam choices pros and cons for different cam types [Re: torqueaddict] #1267673
07/15/12 10:56 PM
07/15/12 10:56 PM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline
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Quote:

It's a hydro roller cam going in a 493 stroker with stealth heads the car is a challenger with a 727 and 323 gears. It's meant to be a street thumper that runs on pumped gas. I want at least 600+ fpt and at least 550+ hp. The compression will be a little over 10.5. What do you think, I want a car that tons of low end to mid range power. Is that descriptive enough or did i miss anything?




That pretty much describes my 505.
10.38:1 compression (440 source 4.25" crank, 7.1" rods, 17cc dish pistons, older 84cc Stealth Heads.) I did some mild porting on the heads and had a multi-angle valve job done. I posted the flow numbers in another post, but I think they flowed around 285cfm at 0.600" lift.
I used the TTI 1-7/8" headers, and the small 2.5" exhaust. Intake is a RPM with Holley for now. That combination ends up being fairly tall to where I am installing a hood with a scoop on it. The Street Dominator intake would be good if you have hood clearance issues. For oiling, I used the reproduction street hemi oil pan. I enlarged the oil pickup for 1/2', but that may be over-kill. It also made finding a correct oil pickup more difficult. I think I ended up with a Mopar pickup and reshaped it a bit to fit.
I have not dynoed the engine, but the Dynomation 5 sim program puts power at 557 HP @ 4,800 RPM, and 643 ft/lbs @ 4,200 RPM. That is with the 770 cfm carb I'm using now. Just changing the carb spec to 1,000 cfm jumps power to 593 HP @ 5,800 RPM, and 665 ft/lbs @ 4,200 RPM.

Forgot the picture:

7294133-505.jpg (46 downloads)
Last edited by 451Mopar; 07/15/12 10:59 PM.
Re: Cam choices pros and cons for different cam types [Re: torqueaddict] #1267674
07/15/12 11:07 PM
07/15/12 11:07 PM
Joined: May 2003
Posts: 6,561
Downtown Roebuck Ont
Twostick Offline
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Quote:

Quote:

Anthony....just remember if you use any flat tappet cam ..you gotta use a zinc additive ,especially on break in..then go to synthetic like Royal Purple...etc...and the solid tappet cams will need to be checked for adjustment regularly...





Ok I get that, right now I have a hyd flat tappet for my stroker, would a hydro roller perform better or do I just need a significantly more aggressive cam? I don't really want to over cam my car but don't want to leave to many horses on the table. I know I have to sacrifice in some area but I still would like over 500 horses an 600 torque. I hope my cam isn't to wimpy for that.




My 9:1 493 does 500hp/600 ft/lbs with a MP509 and Eddie heads. All done by 5000 RPM. I wouldn't do that cam again for my particular application but I wouldn't waste my time and money on a roller for a 5 grand engine either.

Kevin

Re: Cam choices pros and cons for different cam types [Re: 451Mopar] #1267675
07/15/12 11:10 PM
07/15/12 11:10 PM
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east bay ca
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torqueaddict Offline OP
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What kind of cam do you have tho? Would the numbers from the cam I gave you be a good combination or should I just get a hydro flat tappet?

Re: Cam choices pros and cons for different cam types [Re: torqueaddict] #1267676
07/16/12 04:13 AM
07/16/12 04:13 AM
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Aurora, Colorado
451Mopar Offline
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Quote:

What kind of cam do you have tho? Would the numbers from the cam I gave you be a good combination or should I just get a hydro flat tappet?




My cam is pretty mild because I plan to go fuel injected when my wallet recovers from building this engine, and I don't plan on reving the engine over 5,500 RPM. It is the Comp XR286HR-10. Only 236/242 duration at 0.050", 286/294 @ 0.006". Advertised valve lift with 1.5:1 rockers is 0.544/0.541", with my 1.7:1 rockers it is 0.617"/0.614".

For a big engine it revs quick. You will want to have a rev-limiter. When I first took the car out I was suprised I did not hurt the engine when I over-reved the engine in first gear, and then it did it again in 4th gear when the clutch decided to slip.

Re: Cam choices pros and cons for different cam types [Re: 451Mopar] #1267677
07/16/12 01:22 PM
07/16/12 01:22 PM
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east bay ca
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torqueaddict Offline OP
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Its funny but my buddy said he had fuel injection of a stroker with a really radical cam. He said it made the car run so smooth you couldnt tell it had a really big cam.

Re: Cam choices pros and cons for different cam types [Re: torqueaddict] #1267678
07/16/12 03:05 PM
07/16/12 03:05 PM
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Bend,OR USA
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My first pump gas stroker was a 400 block bored to 4.375 and stroked to 4.25 with BB chevy rod sizes,(512 C.I.) I used a set of 906 iron heads with bigger valves that flowed 260 CFM at .600 lift, not a set of real good heads It was 9.25 to 1 comp. ratio, I used a Eddy low deck six pak intake and stock type carbs, that motor made 612 HP at 5600 RPM and 644 Ft. Lbs torque at 4500 RPM on CA pump swill back in 2004 on Vrbancic Bros. DTS engine dyno in Ontario, CA. That motor exceeded my expectation by a bunch I bought and used a Comp Cams custom grind solid roller cam that has 260 degrees at .050 with .420 lobe lift, the exhaust has 266 duration at .050 with .409 lobe lift, I used a set of 1.6 rockers so the net lift at the valves is right at .700 It pulls like gang busters, it is a real tire spinner also on bad surfaces My message is don't be afraid of big camshafts, stroker motors eat them up I have used custom ground hydraulic roller lifter grinds in other stroker motors, both types work well I have a 3.91 stroke 440 that is 464 C.I. with a set of Eddy RPM non ported heads that has a Comp Cams XE295HL in it, it has a six pak also, that motor is right at 3/4 second slower than the other motor is in my Duster The old 512 motor is now 518 C.I.(I increased the stroke to 4.300 to raise the compression ratio to 10.29 to 1 with the Eddy RPM heads I had on it back then) and I then switch heads again to a set of Indy SR with M.W. ports and a single Indy 400-3 intake with a Holley 1050 Dominator. The Indy heads increased the compression ratio to 10.78 to 1 now Don't be afraid of using a bigger cam, the stroker motors make them seem smaller than when there in a stock stroke motor


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Cam choices pros and cons for different cam types [Re: Cab_Burge] #1267679
07/16/12 03:58 PM
07/16/12 03:58 PM
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east bay ca
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The problem for me is I am not very knowledgable when it comes to hoe the cam specs effect my motor. In fact I am just not sure at all. In fact the cam I actually have some might say its to small. I am just trying to find one that will be right for me is what Im trying to say. First I need to know if the lunati voodoo cam I have is good enough.

Re: Cam choices pros and cons for different cam types [Re: torqueaddict] #1267680
07/16/12 04:09 PM
07/16/12 04:09 PM
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NEW JERSEY
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Just like porting ...you can try what you got ...and change it later if you don't like it..yes cubic inches do make a cam seem smaller at idle..

Re: Cam choices pros and cons for different cam types [Re: dynamite] #1267681
07/16/12 04:25 PM
07/16/12 04:25 PM
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east bay ca
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Larry I think I showed you my cam specs from the cam I actually have, did it seem too small?

Re: Cam choices pros and cons for different cam types [Re: torqueaddict] #1267682
07/16/12 05:09 PM
07/16/12 05:09 PM
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I'm sure it will work well, It doesn't look bad ,,There may be one (without going to a roller) that will work better with your combo is all I'm saying,and really only an experienced cam builder/designer is qualified to say.. and they can, in most cases regrind your cam to better specs..if you chose to do so..Tim at Bullet cams is the mopar cam guy to call..do yourself a favor ..just make the call and talk to him ..for the $$ of a phone call get your questions answered by a pro..

Re: Cam choices pros and cons for different cam types [Re: dynamite] #1267683
07/16/12 11:31 PM
07/16/12 11:31 PM
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east bay ca
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I talked to Tim at Bullet. Hes a really good guy. We talked about my cam and the kind of power it would generate. He said the cam I had would work good for my application but I could go with a bigger cam especially if I plan to put bigger gears in my car. I may just keep the one I have and go from there. Lunati basically told me as long as its not broken I can return it. Hell he made it seem as if I could exchange it and get a bigger cam if I dont like the way it performs. When people stand by theyre product it makes me want to give them a shot just too see theyre level of quality. I will update when its in to let you guys know how it turned out. Thanks for all the help guys!

Re: Cam choices pros and cons for different cam types [Re: dynamite] #1267684
07/17/12 12:14 AM
07/17/12 12:14 AM
Joined: May 2003
Posts: 6,561
Downtown Roebuck Ont
Twostick Offline
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Quote:

yes cubic inches do make a cam seem smaller at idle..




It might "act" smaller but it sure won't sound smaller. As my machinist puts it "76 deg of overlap is 76 deg of overlap" as is the case with the MP509 I have in mine.

Where the cubes help is that it will have bottom end torque. A 509 in a 440 is a stone without at least a 3500 stall converter and minimum 3.91 gears. My 493 was swinging the needle on the dyno big time at 1500 and was making 500 ft/lbs by 2000. The only reason I put a 2800 converter in mine was so it wouldn't smash the driveline when you put it in D at 1100 rpm. Other than that it just drove away fine with the stock converter and a 2.76 gear.

First and only time out it went 13.92 at 101 4800 lbs with me in it. That was with full exhaust 2.76 SG and a no traction 2.23 60 ft.

Kevin

Re: Cam choices pros and cons for different cam types [Re: 451Mopar] #1267685
07/19/12 09:17 PM
07/19/12 09:17 PM
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NEW HAMPSHIRE AND MAINE
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you covered that brother

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