Cam intake center line advice
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Cam intake center line advice

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    Default Cam intake center line advice

    I could use some icl advice for a 540 street strip engine i'm buliding it is 10.8 compression, afr 315 heads, the cam is a Lunati Voodoo sold roller with 255* 263* at .050 with .680 lift and on a 110 lobe seperation angle, the cam card calls for the icl to be set at 104 but that would be 6* advance which just seems like a lot to me but I live at 5500 feet so maybe a little extra advance is better, I've call Lunati and one guy said to go 106 or 108 and another guy said to stay with the 104 so any help from you cam gurus would be great
    Thnks John
    Last edited by sport; 04-13-2012 at 03:09 PM.

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by sport View Post
    I could use some icl advice for a 540 street strip engine i'm buliding it is 10.8 compression, afr 315 heads, the cam is a Lunati Voodoo sold roller with 255* 263* at .050 with .680 lift and on a 110 lobe center, the cam card calls for the icl to be set at 104 but that would be 6* advance which just seems like a lot to me but I live at 5500 feet so maybe a little extra advance is better, I've call Lunati and one guy said to go 106 or 108 and another guy said to stay with the 104 so any help from you cam gurus would be great
    Thnks John
    I think your confusing the lobe seperation angle of 110* with the recommended 104* intake centerline.
    Lobe sep. angle is degrees from intake lobe centerline to exhaust lobe centerline. The 104* intake centerline is a reference from TDC of the piston to the exact centerline of the intake lobe.
    Advancing the cam will ususally give a little more bottom end and maybe kill a tiny bit of top end, retarding does the opposite. Check piston to valve clearances. Advancing/retarding changes clearances.
    I would stay with the 104 myself.
    Last edited by Hass828; 04-13-2012 at 02:29 PM.
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    Sorry I ment 110 LSA, I would like to get a little more top end because I think it is going to have alot bottom end any way and the car is a 69 camaro so it is not that heavy, I am hoping to get peak power in the 6300-6500 range, I'm just not sure how much differance 2* will make.
    Last edited by sport; 04-13-2012 at 09:30 PM.

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    1. 255 [email protected] .050
    2. 10.8:1 compression (I bet it's less)
    3. operating range 6,300 rpm
    4. rear end ratio hardly matters, cam is too big even if you are running 455s


    WRONG CAM, put it in anywhere you want and it won't perform as well as the correct cam simply installed close to where it should be.
    It's all about the combination, heads, comp ratio and operating range are good until you get to the cam.

    Just my opinion

  7. #5
    steelcomp was here
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    Run it like it is. Nothing wrong with that cam and your combination.
    Just out of curiosity, where does the intake open and close?
    Last edited by scott foxwell; 04-13-2012 at 06:02 PM.
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    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by steelcomp View Post
    Run it like it is. Nothing wrong with that cam and your combination.
    Just out of curiosity, where does the intake open and close?

    I'll second that.


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    Quote Originally Posted by steelcomp View Post
    Run it like it is. Nothing wrong with that cam and your combination.
    Just out of curiosity, where does the intake open and close?
    intake opens at 23.5* closes 51.5* at .050 so are you saying run it at the recommended 104 ICL

    Luke here is how I came up with 10.8
    custom JE piston 19cc dome
    Bore 4.5
    Stroke 4.25
    Head gasket .039 X 4.540
    Piston down in the hole .005
    Head volume 120cc
    what do you come up with

  10. #8
    steelcomp was here
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    Quote Originally Posted by sport View Post
    intake opens at 23.5* closes 51.5* at .050 so are you saying run it at the recommended 104 ICL

    Luke here is how I came up with 10.8
    custom JE piston 19cc dome
    Bore 4.5
    Stroke 4.25
    Head gasket .039 X 4.540
    Piston down in the hole .005
    Head volume 120cc
    what do you come up with
    Yep. I'd leave it right where it is. Compression is correct. If you take into consideration the area around the piston above the top ring it might be 10.78...close enough.
    Last edited by scott foxwell; 04-13-2012 at 09:49 PM.
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    Quote Originally Posted by Sleeper CP View Post
    I'll second that.


    S CP
    x3 on the cam being ok . would think in your camaro if your intake and exhaust are working i'd go with 108 ic/l
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

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    sport,

    I don't doubt that your math is correct, I think my point is that 90% of people that bring their motor in to me when I check it the compression it's almost always lower then they think it is. That being said I always fill the cylinder up when motor is fully assembled and CC it that way, I just think that is more acurate. Anyway a half point either way is not the real issue I see. I think that [email protected] .050 means the cam wants to run in the 7500 rpm range. I think if you are going to error I would rather error towards the small and of the scale. A cam with [email protected] .050 would probably be a much better selection and on a 106-108 would be much funner to drive and act like a raped ape to 6500.
    Just my thinkin, good luck

    luke

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    Quote Originally Posted by luke View Post
    sport,

    I don't doubt that your math is correct, I think my point is that 90% of people that bring their motor in to me when I check it the compression it's almost always lower then they think it is. That being said I always fill the cylinder up when motor is fully assembled and CC it that way, I just think that is more acurate. Anyway a half point either way is not the real issue I see. I think that [email protected] .050 means the cam wants to run in the 7500 rpm range. I think if you are going to error I would rather error towards the small and of the scale. A cam with [email protected] .050 would probably be a much better selection and on a 106-108 would be much funner to drive and act like a raped ape to 6500.
    Just my thinkin, good luck

    luke

    Keep in mind that this thing is 540 CI... 245 @ .050 might get you to the grocery store or church on sunday .... 255 @ .050 WILL pull to 7500RPM.... in a small block... JMO...
    If you love someone set them free, If they come back with the cops...RUN!!!

  14. #12
    steelcomp was here
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    Quote Originally Posted by luke View Post
    sport,

    I don't doubt that your math is correct, I think my point is that 90% of people that bring their motor in to me when I check it the compression it's almost always lower then they think it is. That being said I always fill the cylinder up when motor is fully assembled and CC it that way, I just think that is more acurate. Anyway a half point either way is not the real issue I see. I think that [email protected] .050 means the cam wants to run in the 7500 rpm range. I think if you are going to error I would rather error towards the small and of the scale. A cam with [email protected] .050 would probably be a much better selection and on a 106-108 would be much funner to drive and act like a raped ape to 6500. Just my thinkin, good luck

    luke
    Curious how you know this simply by the .05 numbers.
    If God is your co-pilot, change seats!
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    Senior Member Hass828's Avatar
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    Quote Originally Posted by sport View Post
    Sorry I ment 110 LSA, I would like to get a little more top end because I think it is going to have alot bottom end any way and the car is a 69 camaro so it is not that heavy, I am hoping to get peak power in the 6300-6500 range, I'm just not sure how much differance 2* will make.
    You still arent getting it. The LSA is ground into the cam and cant be changed. The ICL is where the cam is in reference to the crank and can be changed. Stick with the 104 that the card asks for.
    "if we keep doing it the same way we always do..we will always get the same results"
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    When doing the NASCAR engines they had to be no greater than a certain compression, to prevent embarrassment and loosing a race due to over compression we whistled every engine! This is done with rocker arms off and engine temperature as close to operating range as possible.

    Good luck!
    Last edited by Spudpilot; 04-15-2012 at 08:03 AM.

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