3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

At which Lift or duration does your idle get lumpy?

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Old Nov 24, 2004 | 07:35 AM
  #31  
Zepher's Avatar
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From: Norfolk, VA. USA
Re: At which Lift or duration does your idle get lumpy?

I had the Crane Cams Powermax 2050 in my 305, loped a lot when cold and had that cool cam sound when warm.
here is a video of the car,
http://www.transamws6.com/video/ZepherWS6.mpg
Old Nov 24, 2004 | 10:13 PM
  #32  
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Re: At which Lift or duration does your idle get lumpy?

The whole time reading that post (ws6transam) I was like.. "yup.. I have a T5" lol. But no worries
whta is the SOTPometer? Why will setting the cam timing to that degrees help w/ low end punch? Will i need to put higher octane fuel in? What is the intake centerline?
Manny.. i have the vid on my computer. i LOVE the sound of your car :jelous: It does sound quite nice idling too :thumbsup:
Old Nov 24, 2004 | 10:58 PM
  #33  
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Re: At which Lift or duration does your idle get lumpy?

Originally Posted by 85_305

whta is the SOTPometer?
Seat Of The Pants-ometer. Lots of people on this forum use them as their exclusive performance measurement device. Some people's SOTPometer's are so well-calibrated that they can feel the difference between a new AC spark plug, a Splitfire plug, and a Tornado intake insert.

Originally Posted by 85_305
Why will setting the cam timing to that degrees help w/ low end punch?
Setting the cam timing such that the intake valve reaches peak lift height at 104 degrees past top-dead-center will help fatten the torque curve while causing a little roll-off at the top end of the RPM band. Setting cam timing for intake centerline (ICL) is what is commonly called "degreeing in" the cam. You adjust it with three-way keyed cam chains, or with offset woodruff keys.

305's seem to like 104 degree ICL, whereas most 350's seem to liek 106 degree ICL, and stroker 383's like 108 ICL.

Will i need to put higher octane fuel in?

What is the intake centerline?
No, no octane requirement differences, unless you mess with the timing curve. Intake centerline is usually the point where the intake valve reaches maximum lift relative to piston position. "Centerline" is officially half-way from the point where the intake valve begins to lift from the seat, to where it returns to the seat. For instance, an intake lobe with 256 degrees of total duration will have its centerline at 128 degrees beyond the initial movement of the intake valve. If this centerline occurs at 104 degrees from top-dead-center, it means the intake valve will begin opening at (104 - 128) degrees, or 24 degrees before top dead center. If you dial in a 110 degree ICL, your cam will open the valve at 18 degrees before TDC.

Check the Comp Cams website, I think they have some illustrations online that help explain how this works.
Old Nov 25, 2004 | 10:41 PM
  #34  
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Re: At which Lift or duration does your idle get lumpy?

Hm.. I think my SOTPometer is quite nicely "calibrated", lol.
I will tell the guy that is helping me w/ the rebuild about the degrees to set everything set to. THanx ws6!
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