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More cam Thoughts
#945950
03/08/11 12:31 AM
03/08/11 12:31 AM
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Joined: Jan 2003
Posts: 3,831
N.E. Ohio
6bblFLASH
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,831
N.E. Ohio
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Just benchracing a few thoughts with some freinds:  You have a motor with a ROOTS type supercharger making 375hp.on a dyno. Cam is 108C/L and 68* overlap 284* duration. Makes 6-lbs boost. Swap cams to a 114 C/L 56* overlap 278/290 duration cam, same 6-lbs boost,,,,,,, How much power difference would you expect????????? 
Last edited by 6bblFLASH; 03/08/11 12:40 AM.
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: More cam Thoughts
[Re: TheOtherDodge]
#945959
03/09/11 09:18 PM
03/09/11 09:18 PM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
What are the valve timing events of these cams?
284/108 cam------open---------close
intake--------34*BTDC-------70*ABDC
exhaust-------70*BBDC-------34*ATDC
278/290/114 cam----------------------
intake--------25*BTDC-------73*ABDC
exhaust-------79*BBDC-------31*ATDC
IMO, even though theres 6# of boost involved, the extra 6* of intake duration of the 284 cam will make more power. Sure it has more overlap, but at this small cam size it might not be a bad thing.
The overlap period alows the scavenging effect to take place. With enough boost and overlap you may not want that. But , with this small of cam and boost, that small snap of scavenge on overlap maybe usefull.
Id take the 6# of boost @ 284* duration over the 6# of boost @ 278* duration. Im just guessing/bench racing here.  
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Re: More cam Thoughts
[Re: Sport440]
#945960
03/09/11 10:01 PM
03/09/11 10:01 PM
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
blownzoom440
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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thanks for posting the cam #'s in the past i went from a 110 to a 113 and gained boost signal and VE% maintaining close maxlift #'s in the .540 range solid ft.8lbs/under. i am going to print the spec to be sure it is what i think. 4300S .525/.555, 288/296, 254/264, 110° bds cam .541/.559 289/297 252/260 113 comp cam in op a .050 13/cl 59 ex op 63/cl 17 
Last edited by METAL STORM; 03/09/11 10:23 PM.
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Re: More cam Thoughts
[Re: TheOtherDodge]
#945962
03/10/11 12:54 PM
03/10/11 12:54 PM
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
blownzoom440
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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Quote:
That is a lot of overlap to be running with forced induction... 
are you talking about mine,what 1?or the op cam?i dont mean to take over the post just showing results.
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Re: More cam Thoughts
[Re: TheOtherDodge]
#945966
03/10/11 02:50 PM
03/10/11 02:50 PM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
That is a lot of overlap to be running with forced induction...
Your right those events are from the advertised numbers. The .050 numbers for the 284 cam would be around 241* dur@ .050 if it were a MP cam. For easy math let me use 240*@ .050
those events would be
284/240@.050 cam----open--------close---
intake--------------12*BTDC------48*ABDC
exhaust-------------48*BBDC------12*ATDC
Witch gives 24* of overlap @ .050
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someone who knows what thay are talking about may say otherwise.i assume the cam is a solid flat tappit,same lift. 
sorry i am not much help.what i learn i forget easy. 