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Re: At risk of being retarded
[Re: moparmanjames]
#228578
02/20/09 12:47 AM
02/20/09 12:47 AM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
master
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master
Joined: Jan 2007
Posts: 3,695
nc
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I trying to pull faster in high gear between 6500 & 7k the 260 cam pulls it a little too slow , only need 7k max rpm , The engine is 414 small block 12 to 1 with flat tops W5 325@.650I 235@.650e current cam comp solid roller 260/262@ .05 .631 lift with 1.5s 106lsa on 106 , we run .058 quench for bme rods , truck weighs 3250 / 3500 with me , 5k stall , 727 w stock ratios 3.90 x2 gear ratio with 38.5 tall x 15w tires
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Re: At risk of being retarded
[Re: mopardamo]
#228581
02/21/09 12:17 AM
02/21/09 12:17 AM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
master
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master
Joined: Jan 2007
Posts: 3,695
nc
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In mud racing you need all your power in asap , we only go 200ft , we went from a 38.5 x11w rear tire to a 38.5 x 15w and slowed the truck dowm 2,5 tenths , the wide tire launches better and truck handles a lot better, the problem is in high gear there is a lag in the rev to 7k , engine hits 6500 instantly with the wide tire , with the skinny tire we hit 7k instantly , trying to cam up to the best cam for my rig hoping to correct the power lag , 7k is all the wheel speed I need with tire dia and gears, I know I need a little more duration maby 265 to 270 range but trying to widen power band also thats where i am having problems with witch lsa to choose.
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Re: At risk of being retarded
[Re: emarine01]
#228582
02/21/09 02:06 PM
02/21/09 02:06 PM
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Joined: Jan 2005
Posts: 1,260
Las Vegas NV
moparmanjames
pro stock
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pro stock
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
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Quote:
In mud racing you need all your power in asap , we only go 200ft , we went from a 38.5 x11w rear tire to a 38.5 x 15w and slowed the truck dowm 2,5 tenths , the wide tire launches better and truck handles a lot better, the problem is in high gear there is a lag in the rev to 7k , engine hits 6500 instantly with the wide tire , with the skinny tire we hit 7k instantly , trying to cam up to the best cam for my rig hoping to correct the power lag , 7k is all the wheel speed I need with tire dia and gears, I know I need a little more duration maby 265 to 270 range but trying to widen power band also thats where i am having problems with witch lsa to choose.
Well after I punched the numbers in I saw that you definitely picked up on the top end with a wider LSA but with that came less torque @ 5500, so I decided to go the other way and tighten the LCA but increase duration.
Lunat makes a nice grind the SBMopar 50415 Roller.
Specs are .636 lift with your rockers, 104 lsa on a 102, and 276* duration. I don't have your heads in my database so I was using some Indy's with similar flow, but this cam made more torque and HP from 5500 to 7000, and if you want to give up a tiny bit of torque at 5500, 2ftlb, running it straight up will give you a gain at 7000 of 30hp in my tests.
Hope that helps.
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Re: At risk of being retarded
[Re: emarine01]
#228584
02/21/09 02:39 PM
02/21/09 02:39 PM
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Joined: Jan 2005
Posts: 1,260
Las Vegas NV
moparmanjames
pro stock
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pro stock
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
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Quote:
Wow , thats going the other way than I was thinking, The older I get seems the less I know, Thanks again for the leg work , what kinda hp & torque numbers were you seeing?
693hp pretty much from 6600 to 7000 and 616 tq at 5100, but my test runs were very specific and I only graphed from 5100 to 7000 so I could focus on your particular needs.
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Re: At risk of being retarded
[Re: moparmanjames]
#228585
02/21/09 02:47 PM
02/21/09 02:47 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I was guessing that he could have used something like a 112 lsa, installed at 104-106 and just a little more duration, something about 286-290... just a guess 
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Re: At risk of being retarded
[Re: emarine01]
#228588
02/21/09 03:28 PM
02/21/09 03:28 PM
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Joined: Jan 2005
Posts: 1,260
Las Vegas NV
moparmanjames
pro stock
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pro stock
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
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Quote:
The only program I have is the freebe from cam quest <comp cams> I was getting numbers close to yours , My buddy has desk top dyno and the numbers were 75 hp lower , I allways thought this was around a 600hp engine , we have run with and beaten guys with dyno sheets over 700hp in trucks close to the same weight, I allways thought I was just lucky? 
Well, I did use a 1050 dominator and 2" headers, with the cam you have now I only got 665 or so hp, so you weren't far off with your program.
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Re: At risk of being retarded
[Re: emarine01]
#228590
02/21/09 04:30 PM
02/21/09 04:30 PM
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Joined: Jan 2005
Posts: 1,260
Las Vegas NV
moparmanjames
pro stock
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pro stock
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
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Quote:
With the big cam we run a 1050 on a 2" spacer , small cam we went down to the 850 bg ,the bg guys say that the 850 will flow over 1000 any time any where? You are showing a major gain with your cam choise , a 104lsa just blows me away on how my mind isent grasping the cam timing thing , with a 104 lsa means more overlap , with my fender well headers at a low idle around 1000 rpm the 106lsa will just about suck your shirt off if your close to the header, at 104 lsa I might be sucken down low flying birds, might have to put a screen up or something?
Well I would turn the idle up a bit then lol. Keep in mind that this is going to run about the same at 5500 but it slowly gains on the other cam to 7000. The difference builds to 30 hp @ 7000 rpm.
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Re: At risk of being retarded
[Re: emarine01]
#228592
02/21/09 06:08 PM
02/21/09 06:08 PM
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Joined: Jan 2005
Posts: 1,260
Las Vegas NV
moparmanjames
pro stock
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pro stock
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
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Quote:
Hey I see where your going with the 104, went on cam quest and went with a chebby , comp has lots of cams for chebbys compared to mopars, can play with specs more, the torque is coming from early intake closing with the tight lca and the hp from the long duration in upper rpms?
Yes, that's why I bought this program, to experiment with parts before I bought them and save a boatload of money on parts I would have otherwise had to guess about.
It's around $500 but it's paid for itself over the 6 years that I have had it.
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