gm 847 cam
08-03-2009, 05:08 AM
#21
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Might want to raise that bar a bit higher. I had one in a stock cube stock head car and and it was still pulling at 6300 rpms. After I rebuilt to a 355 and added LE2 heads. I pulled all the way to 6900 and it was still building power. But the ECU cut me off there.
08-03-2009, 05:19 AM
#22
There are a lot of critical details not covered in the typical published specs you are looking at.
The "wider is better for nitrous" thing gets thrown around WAY too much. A guy on the Impala board went from a GM 845 cam to a custom Crane ground specifically for nitrous added 8 degrees or so intake duration, more on the exhaust and put it on a 116 and went slower NA and no faster on the bottle. In hindsight he realized that it MIGHT have worked if he had sprayed a 300 shot but he was not aiming that high.
Generally it is agreed on that if you are spraying less than 250 shot use a NA optomized cam because a nitrous cam would hurt it more off the bottle than it will help on.
08-03-2009, 01:54 PM
#24
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There are a lot of critical details not covered in the typical published specs you are looking at.
The "wider is better for nitrous" thing gets thrown around WAY too much. A guy on the Impala board went from a GM 845 cam to a custom Crane ground specifically for nitrous added 8 degrees or so intake duration, more on the exhaust and put it on a 116 and went slower NA and no faster on the bottle. In hindsight he realized that it MIGHT have worked if he had sprayed a 300 shot but he was not aiming that high.
Generally it is agreed on that if you are spraying less than 250 shot use a NA optomized cam because a nitrous cam would hurt it more off the bottle than it will help on.
The "wider is better for nitrous" thing gets thrown around WAY too much. A guy on the Impala board went from a GM 845 cam to a custom Crane ground specifically for nitrous added 8 degrees or so intake duration, more on the exhaust and put it on a 116 and went slower NA and no faster on the bottle. In hindsight he realized that it MIGHT have worked if he had sprayed a 300 shot but he was not aiming that high.
Generally it is agreed on that if you are spraying less than 250 shot use a NA optomized cam because a nitrous cam would hurt it more off the bottle than it will help on.
From my on experience. In my last Z I was running out of the box Trick Flows, and a CC503. (DD) I changed out the cam for a custom from Bret Bauer. It had the same duration but on a 108 LSA. I told him it was for a 355 nitrous motor (175 shot). The car actually lost .2 in the quater over the regular CC503 on the same shot. And ran .4 slower NA. (those were the smallest losses.) The only thing I gained was one hell of an idle.
08-04-2009, 03:35 PM
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I love my 847, looking at some stock heads with bigger valves to finish it off and really get the full potential from it.
But then thats just me, I like it.
But then thats just me, I like it.
