Mopar Performance Purple Mechanical Camshaft - P4120653AE Cam Card

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512Stroker

512Stroker

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I am looking for the cam card info for a Mopar Performance Purple Mechanical Camshaft - P4120653AE
Thanks
 
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512Stroker said:
Be pretty tough to do a thorough job to degree in the cam
Click to expand...
MoPar have instructions on how to set it up the simple way. As long as the camshaft was ground properly as per MoPars specs, there should be no problem at all.
 
rumblefish360 said:
MoPar have instructions on how to set it up the simple way. As long as the camshaft was ground properly as per MoPars specs, there should be no problem at all.
Click to expand...
So, aftermarket cam manufacturers include the timing events on a cam card so you can make sure that they ground it properly?
 
With the cam in the motor, and a few minutes with a degree wheel and a pointer....... you could have the events for any lift point you choose.
 
On the last couple I did one degreed in at 110.5 the .050 numbers were IVO 12 IVC 53
EVO 55 EVC 9
The other one in at 109 the .050 numbers were IVO 13 IVC 50.5
EVO 58 EVC 7
 
PRH said:
With the cam in the motor, and a few minutes with a degree wheel and a pointer....... you could have the events for any lift point you choose.
Click to expand...
I do not have this cam yet.
It is one that I am looking at for possible future use.
May be tough to find one a few of the sites I looked at stated "not available"
 
rustycowll69 said:
Is that a misprint for cam with 102 installed centerline?
If given recommended installed centerline number, can't you simply Calc the events?
Click to expand...
102 ? which cam ? I did not see that.
No you cant calculate it on paper
You can measure the valve timing events with a degree wheel after it is installed.
 
512Stroker said:
102 ? which cam ? I did not see that.
No you cant calculate it on paper
You can measure the valve timing events with a degree wheel after it is installed.
Click to expand...
4529343. Sl/6 mech.
Oh, I think you can Calc the events. Maybe not at 0.050", but the theoretical events, which is the way Mopar used to advertise them.
 
512Stroker said:
102 ? which cam ? I did not see that.
No you cant calculate it on paper
You can measure the valve timing events with a degree wheel after it is installed.
Click to expand...
As an example:
284 adv duration, meaning 284/2=142 ea side of int lobe centerline.
Intake @ 110 atdc.
For int opening event:
142-110= 32 btdc. Int opens
For int closing event:
110+143=252; 252-180= 72 abdc.
Compare to the chart.
QED
 
rustycowll69 said:
4529343. Sl/6 mech.
Oh, I think you can Calc the events. Maybe not at 0.050", but the theoretical events, which is the way Mopar used to advertise them.
Click to expand...
102 is most likely correct the intake lobe centerline is 102*
 
512Stroker said:
Im sorry I should have clarified you cant calculate all the data points given on a cam card. And I trust a degree wheel to be absolute.
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My point wasn't to prove you wrong. It was to show you don't have to have the cam events printed FOR you. With just the cam centerline, & advertised duration, you can derive the theoretical cam events.
I've never tried to derive the events from the @ 0.050" , but it can probably be done as well.
 
512Stroker said:
Im sorry I should have clarified you cant calculate all the data points given on a cam card. And I trust a degree wheel to be absolute.
Click to expand...
This ^^^^

rustycowll69 said:
My point wasn't to prove you wrong. It was to show you don't have to have the cam events printed FOR you. With just the cam centerline, & advertised duration, you can derive the theoretical cam events.
I've never tried to derive the events from the @ 0.050" , but it can probably be done as well.
Click to expand...
Not exactly true but …..
Most calculations are done with a know advertised lift point of let’s just say @ .006. If you start running through a Comp Cam catalog, only certain cams are advertised in this way while others are at different points.
Now travel onto Crane Cams, Howard’s, etc….
You’ll find the same thing.
 
rumblefish360 said:
This ^^^^


Not exactly true but …..
Most calculations are done with a know advertised lift point of let’s just say @ .006. If you start running through a Comp Cam catalog, only certain cams are advertised in this way while others are at different points.
Now travel onto Crane Cams, Howard’s, etc….
You’ll find the same thing.
Click to expand...
I disagree. I think it doesn't matter where manufacturer, "X", wants to start measuring duration. If they give you a recommended installed lobe centerline spec and a duration spec you can derive the events for whatever their particular method for measuring is, as long as the opening lobe profile and closing lobe profile are mirror images of each other(symmetrical about the lobe centerline).
 
PRH said:
With the cam in the motor, and a few minutes with a degree wheel and a pointer....... you could have the events for any lift point you choose.
Click to expand...

Yup. An engine and degree wheel is the best cam doctor. I've found discrepancies on a lot of cam cards through the years. Some I let slide and some I sent back.
 
rustycowll69 said:
Is that a misprint for cam with 102 installed centerline?
If given recommended installed centerline number, can't you simply Calc the events?
Click to expand...

I don't care. It's not my cam or my dilemma. I just posted the link to the specs.
 
I can tell you from my experience with MP cams...all the durations @.050 are incorrect. They are calculated number
I have used many MP590 cams for small blocks....MP shows 265 @ .050 my degree wheel shows 271 duration @.050

Same with the MP557 cam....MP 252 duration....my degree wheel keeps showing 258 @ .050
As said put in an engine and run a degree wheel on it......only way...
 
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