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Forced Induction - V8 V8 Supercharger, turbo, nitrous discussions

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Old 11-13-2010, 11:03 PM   #1
blake-b

 
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supercharger and 112+4 cam

For a daily driver that may never see a track, how much power am i giving up with this cam and a supercharger vs. a cam meant for a SC such as one with a wider LSA (but similar lift, duration)?
Would I notice much of a difference daily driving?
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Old 11-14-2010, 08:30 AM   #2
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What is the lift and duration? What s'charger are you considering?
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Old 11-14-2010, 09:25 AM   #3
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620/612 232/240@050. Probably a whipple down the road some.
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Old 11-14-2010, 09:30 AM   #4
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Sorry for this, but I have always wondered what the +4 means on cam spec.
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Old 11-14-2010, 10:11 AM   #5
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I may be wrong but that cam may be a little big for the SC. It will work but my cost you a little over what a SC cam would give you. If you really do plan to SC it, why not just put in the best cam for what every SC company your going to use recomends?
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Old 11-14-2010, 11:14 AM   #6
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If you like how it drives, give it a try. It will work with a P/D blower. You'll just have to spin the blower faster to make similar power vs a well designed blower cam. More blower rpm = more heat.


You're going to have to pin the crank anyway. That's a bunch of the work to change a cam already done. If you're considering a cam change, then would be the time to do it. Your cam has 12 degrees of overlap. Most blower cams have negative overlap. When you're fooling with a p/d blower, bigger usually isn't better in the cam dept. There are bigger blower cams around than are commonly used in Camaros; but, through the use of wider LSA's, most still have little or no overlap.
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Old 11-14-2010, 01:40 PM   #7
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that cam looks more like an n/a cam than a supercharger cam
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Old 11-14-2010, 02:12 PM   #8
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Quote:
Originally Posted by 10aSSee D View Post
Sorry for this, but I have always wondered what the +4 means on cam spec.
+4 degrees advanced timing
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Old 11-14-2010, 05:31 PM   #9
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Quote:
Originally Posted by danhr View Post
that cam looks more like an n/a cam than a supercharger cam
It is. I have it on hand and it would be quite a while (over a year) until I could get a supercharger anyway. I was thinking of going ahead and getting the cam installed and was just wondering what adding a SC would do to it. I guess I could always swap in a different cam (more supercharger friendly) at that time (taking out the 112+4) since I would need a tune and the necessary valvetrain upgrades would already be in place. I am not a collect everything and then do it all at once kind of guy. I don't have that kind of patience.
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Old 11-14-2010, 07:15 PM   #10
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Quote:
Originally Posted by bi11ymc View Post
+4 degrees advanced timing
Thanks, that makes sense.
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Old 11-14-2010, 07:33 PM   #11
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Don't really know that Cam but willing to say it's on the big side for a PD type of blower.The fun part is to can pulley the hell out of the blower because the DCR will be pretty low.
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Old 11-16-2010, 01:26 PM   #12
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These motors have EXTREMELY well flowing heads on the intake side, yet the exhaust is anemic at best.

So although you have 8* of seperation, it is negated by the additional lift on the intake side.

We ALWAYS tend to cam a screw style (KB, whipple) positive displacement car, more on the N/A cam side. But we try to keep the lift at no more than about .605". Mainly because the blower itself will already make up for any bottom end losses. The larger screw blowers have suffiicient flow to allow for this type of thinking. Some of the other smaller PD blowers, tend to cam their cars in a manner that allows the blower to work as little as possible, while producing the highest amount of power per revolution of the blower. This is because they need to maximize the avail flow that they have. Not that its bad, just a different manner at making power.

IF, and only if you will be running a Whipple or KB, then yes, you can start to get away with that cam. If you were running a maggie, I would say no. Not because its bad, only because it doesnt have as much high speed flow, for the losses that cam is going to allow. But even with the larger blowers, your starting to push it. That cam has 12* of overlap. So although its a bit of overlap, its not a ton. If I had the cam in the car, I would be willing to try it.

10aSSee D,
The +4, means 4* of Intake advance has been pre-ground into the cam. It is the same as taking a cam that has no advance in it, and when degreeing it, to advance the cam forward 4*. By advancing a cam, you are biasing your torque curve lower in the RPM band. You will typically make torque sooner, with advance in a cam. In this case, the 112lsa, is a tight lobe seperation. This is gonna make the cam ramp real fast, and cause more of a "Peak" style power curve. This is something the N/A guys love. One way to balance this out, is by adding advance. That will tend to put some grunt back in the power curve, that the 112 was giving up. Because with 4* of advance, the intake centerline is now at 108*, rather than 112*.

HTH
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