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Re: Cam changes or not. [Re: MR_P_BODY] #1131672
12/12/11 02:28 AM
12/12/11 02:28 AM
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Posts: 27,421
Balt. Md
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383man Offline
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As stated by Mr_P if you have the room with the valves to the pistons you might try tightening the valves up some just to see how it reacts. It can give you and idea if it might like the cam advanced if it helps the low end. Just a cheap idea to try if your are not dead set against changing the cam.

Sorry as I did not mean to harp about whether you had degreed the cam as I know how you can ask a question on the board and get a million answers other then what you really asked for. Ron

Re: Cam changes or not. [Re: 383man] #1131673
12/12/11 02:47 AM
12/12/11 02:47 AM
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Gainesville,FL
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goldmember Offline
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You'd want to loosen(not tighten) the lash a few thou if you want to help the bottom end. I think the cams a little long for the combo,I'd knock 10-14 degrees out and you'll be fine. Tim @ bullet cams has what you need if you cannot tune the current combo to suit your needs.

Last edited by goldmember; 12/12/11 02:49 AM.
Re: Cam changes or not. [Re: 383man] #1131674
12/12/11 10:00 AM
12/12/11 10:00 AM
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Iowa State fan
kilroy Offline OP
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Quote:

As stated by Mr_P if you have the room with the valves to the pistons you might try tightening the valves up some just to see how it reacts. It can give you and idea if it might like the cam advanced if it helps the low end. Just a cheap idea to try if your are not dead set against changing the cam.

Sorry as I did not mean to harp about whether you had degreed the cam as I know how you can ask a question on the board and get a million answers other then what you really asked for. Ron






1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: kilroy] #1131675
12/12/11 10:04 AM
12/12/11 10:04 AM
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kilroy Offline OP
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1 questions.

1) What I dont understand in dynamic CR calcs; they always ask for intake closing event, would not more be determined by the exhaust closing event since they never ask for more specs than just the intake closing event?

Last edited by kilroy; 12/12/11 10:46 AM.

1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: goldmember] #1131676
12/12/11 10:09 AM
12/12/11 10:09 AM
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kilroy Offline OP
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Quote:

You'd want to loosen(not tighten) the lash a few thou if you want to help the bottom end. I think the cams a little long for the combo,I'd knock 10-14 degrees out and you'll be fine. Tim @ bullet cams has what you need if you cannot tune the current combo to suit your needs.




These cam run pretty loose as is and rattle a lot anyways. Whats a "safe" amount of lash to take add without causing serious issues?


1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: kilroy] #1131677
12/12/11 10:23 AM
12/12/11 10:23 AM
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kilroy Offline OP
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Hey guys I found a really great list of calculators!!! Finally found one I can put in cam specs and get the events. Good stuff.

http://www.wallaceracing.com/Calculators.htm

Really eye opening what Ive been discovering.
also how much of the calc theories applies and works directly in the real world?

ALSO discovered that lunati gives there cam events @.050 which I think is the wrong number to use in a dynamic calc?

Last edited by kilroy; 12/12/11 10:48 AM.

1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: kilroy] #1131678
12/12/11 10:46 AM
12/12/11 10:46 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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The thing with the intake closing is thats the last
thing to happen as the piston is starting up the cyl... you
wont start to make compression until the intake closes...
the dynamic compression starts when the intake closes
but it determines where the piston is in the upward
stroke... if you look at the wallace site(dynamic
compression) you will see that it gives you the
EFFECTIVE STROKE... thats the length of compression
you have


Re: Cam changes or not. [Re: MR_P_BODY] #1131679
12/12/11 11:06 AM
12/12/11 11:06 AM
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kilroy Offline OP
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Quote:

The thing with the intake closing is thats the last
thing to happen as the piston is starting up the cyl... you
wont start to make compression until the intake closes...
the dynamic compression starts when the intake closes
but it determines where the piston is in the upward
stroke... if you look at the wallace site(dynamic
compression) you will see that it gives you the
EFFECTIVE STROKE... thats the length of compression
you have






oh wups duh....got to really over thinking things.
was thinking backwards about overlap.


1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: kilroy] #1131680
12/12/11 02:35 PM
12/12/11 02:35 PM
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Moved to N.E. Tennessee
GomangoCuda Offline
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Here you go. This will make your head hurt for sure. http://victorylibrary.com/mopar/cam-tech-c.htm


In theory, there is no difference between theory and practice. In practice, there is.
Re: Cam changes or not. [Re: GomangoCuda] #1131681
12/12/11 04:33 PM
12/12/11 04:33 PM
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kilroy Offline OP
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Quote:

Here you go. This will make your head hurt for sure. http://victorylibrary.com/mopar/cam-tech-c.htm




Thanks!! REALLLY good read. I never even thought about the V/P index. Interesting!!


1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: kilroy] #1131682
12/12/11 04:35 PM
12/12/11 04:35 PM
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
GwaiiEagle Offline
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448 Stroker. 282S Magnum cam lashed at 23 instead of stock 22, 84 cc Eddy's, Crane 1.6's, RPM intake 850dp with 4hole 1 inch spacer, 1.75 headers, 11 inch converter.

A *&^%load of torque, best 60 ft time of 1.65 launching at 1100.

I was wondering in an earlier post about switching to your cam :^/

The giggle factor because of the torque is pretty high with a 3.91 gear.

It is a good winter project, but I wonder, because of the 4 speed if there is a better cam for you than either the magnum 282S or the .557.

Re: Cam changes or not. [Re: GwaiiEagle] #1131683
12/12/11 05:29 PM
12/12/11 05:29 PM
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Posts: 862
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kilroy Offline OP
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Quote:

448 Stroker. 282S Magnum cam lashed at 23 instead of stock 22, 84 cc Eddy's, Crane 1.6's, RPM intake 850dp with 4hole 1 inch spacer, 1.75 headers, 11 inch converter.

A *&^%load of torque, best 60 ft time of 1.65 launching at 1100.

I was wondering in an earlier post about switching to your cam :^/

The giggle factor because of the torque is pretty high with a 3.91 gear.

It is a good winter project, but I wonder, because of the 4 speed if there is a better cam for you than either the magnum 282S or the .557.




Probably is a really a better cam aside from those but, they are the cams I have on hand, that and a MP P4120237 (509cam hyd). Christmas and money as said before are tight but I do have talent the want to tinker.

I know you have a SB but how many Rpm will yours turn?

Mine has plenty of power in the band as stated before and will pull well up to 7k (that my limit with what I have in the motor). Just really doesnt wake up till about 3k and above.


1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: kilroy] #1131684
12/12/11 08:42 PM
12/12/11 08:42 PM
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
GwaiiEagle Offline
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Quote:

Quote:

448 Stroker. 282S Magnum cam lashed at 23 instead of stock 22, 84 cc Eddy's, Crane 1.6's, RPM intake 850dp with 4hole 1 inch spacer, 1.75 headers, 11 inch converter.

A *&^%load of torque, best 60 ft time of 1.65 launching at 1100.

I was wondering in an earlier post about switching to your cam :^/

The giggle factor because of the torque is pretty high with a 3.91 gear.

It is a good winter project, but I wonder, because of the 4 speed if there is a better cam for you than either the magnum 282S or the .557.




Probably is a really a better cam aside from those but, they are the cams I have on hand, that and a MP P4120237 (509cam hyd). Christmas and money as said before are tight but I do have talent the want to tinker.

I know you have a SB but how many Rpm will yours turn?

Mine has plenty of power in the band as stated before and will pull well up to 7k (that my limit with what I have in the motor). Just really doesnt wake up till about 3k and above.





The 448 is a BB (.020 400 block with a 3.75 stroke)

It pulls quite strongly to 5800 and a is little flat after that.

Last edited by GwaiiEagle; 12/12/11 08:44 PM.
Re: Cam changes or not. [Re: GwaiiEagle] #1131685
12/12/11 08:52 PM
12/12/11 08:52 PM
Joined: Mar 2005
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kilroy Offline OP
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Quote:

The 448 is a BB (.020 400 block with a 3.75 stroke)

It pulls quite strongly to 5800 and a is little flat after that.




Never thought about that.

Bummer I like to turn mine to about 6k some too 6500.


1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....
Re: Cam changes or not. [Re: goldmember] #1131686
12/12/11 09:38 PM
12/12/11 09:38 PM
Joined: Jan 2003
Posts: 27,421
Balt. Md
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383man Offline
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Quote:

You'd want to loosen(not tighten) the lash a few thou if you want to help the bottom end. I think the cams a little long for the combo,I'd knock 10-14 degrees out and you'll be fine. Tim @ bullet cams has what you need if you cannot tune the current combo to suit your needs.





No tighten the valves a tad to see if it likes it. It may like the cam advanced some if it runs better. I would only tighten them a few thousands just to see how it runs. I know its not advancing the cam but it will open the vales sooner just a tad. Course it also opens them more so you have to be careful if it does not have alot of PTV clearence. Ron

Last edited by 383man; 12/12/11 09:39 PM.
Re: Cam changes or not. [Re: kilroy] #1131687
12/12/11 11:04 PM
12/12/11 11:04 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

Quote:

The 448 is a BB (.020 400 block with a 3.75 stroke)

It pulls quite strongly to 5800 and a is little flat after that.




Never thought about that.

Bummer I like to turn mine to about 6k some too 6500.




If you like to turn it up to 6500.... I would see if
you CAN advance the cam.. IF you have the piston to
valve clearance... if so then I would advance it
about 4*-6*... that moves the whole torque and HP
range lower in the rpm's... gives you more effective
stroke so it would up the cyl pressure... I have my
cam advanced 6* in the race car but I have the cam
in my street rod straight up but thats a tight 105
LSA cam and I dont want the added torque because
it would raise the stall point higher than I need

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