Another Cam Q
03-04-2009, 08:50 PM
#23
They are all custom grind's PM me for info.
The smaller duration less than 222@.050'' are a little milder, but the mid to low 220's up are about the same as the XE-R. The comp lobes have a little more duration @.200''(lobe) but the ISKY's have a little more at .300''(lobe lift) I have the 215/215, .566''/.566'' , 114* in my truck right now and idle is fairly smooth. Has a light lope cold but fades out when hot. The .532'' isky lobes are narrower seat to seat so thay will idle smoother. For towing the 110, and 112 lobe center work well because the torque is in the midrange. The wider center is a little stronger right off idle, and past peak but weeker in the midrange.
The smaller duration less than 222@.050'' are a little milder, but the mid to low 220's up are about the same as the XE-R. The comp lobes have a little more duration @.200''(lobe) but the ISKY's have a little more at .300''(lobe lift) I have the 215/215, .566''/.566'' , 114* in my truck right now and idle is fairly smooth. Has a light lope cold but fades out when hot. The .532'' isky lobes are narrower seat to seat so thay will idle smoother. For towing the 110, and 112 lobe center work well because the torque is in the midrange. The wider center is a little stronger right off idle, and past peak but weeker in the midrange.
03-05-2009, 12:20 AM
#25
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Lingenfelter and Texas Speed can grind Comp lobes...or do they still send in orders from customers to Comp? I can't remember anymore, but if you call either one of those companies and ask for a custom grind knowing 98% what you already want, they can help.
03-05-2009, 12:29 AM
#26
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03-05-2009, 02:14 AM
#28
If you look at where the stock 5.3L cam specs fall on the tach, the 190/191 duration camshaft starts to peter out around 4800-5000. The 196/207 6.0L cam starts to run out of breath about the same time but with 39 more cubic inches. This gives us a little something to work with when we factor in the displacement of the 5.3L. The 6.0L cam in a 5.3L would raise the rpm band of the 5.3L a few hundred rpm's to about 5500 or so. That's not that big of a change, especially when comparing camshafts still under .500" of lift. With small duration cams, you want the extra lift and valve timing to enhance the cylinder pressure within the given RPM range you're trying to boost up. Cylinder pressure makes torque, and torque makes fun. 
So, where to next? Now is when you start looking at other members on here who have installed a similar cam into the same displacement motor as you have with the mind frame that a 196/207 cam will bring a 5.3L up roughly 500 rpms from stock. Check out their videos and see where the tach starts to fluff off, if any, during the RPM range you're interested in. For this towing/daily driver/fun at times truck, an idle-6100 RPM range is plenty. Make the same variable degree duration jump we made from the 5.3 to 6.0 cam and you have a 20x/21x duration cam with roughly an additional 500 RPM's of room on the tach.
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So, where to next? Now is when you start looking at other members on here who have installed a similar cam into the same displacement motor as you have with the mind frame that a 196/207 cam will bring a 5.3L up roughly 500 rpms from stock. Check out their videos and see where the tach starts to fluff off, if any, during the RPM range you're interested in. For this towing/daily driver/fun at times truck, an idle-6100 RPM range is plenty. Make the same variable degree duration jump we made from the 5.3 to 6.0 cam and you have a 20x/21x duration cam with roughly an additional 500 RPM's of room on the tach.
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Good Information!
