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New Camshaft
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Author:  us7race [ Mon Jan 07, 2013 3:40 pm ]
Post subject:  New Camshaft

Here is the new camshaft for my sbc. I would like to hear opinions on what RPM it will like and how well it should perform.

Image

Author:  Beretta [ Mon Jan 07, 2013 3:59 pm ]
Post subject:  Re: New Camshaft

I can tell you if it were me I would go with more spring pressure. 250 on the seat and 650ish open...Seems like everything looks better with more spring pressure from what I have seen....But I could be wrong :-

Author:  jmarkaudio [ Mon Jan 07, 2013 4:42 pm ]
Post subject:  Re: New Camshaft

Exhaust specs look a bit whacky. Whose cam?

Author:  us7race [ Mon Jan 07, 2013 4:43 pm ]
Post subject:  Re: New Camshaft

Crane...

Author:  us7race [ Mon Jan 07, 2013 4:43 pm ]
Post subject:  Re: New Camshaft

Beretta wrote:
I can tell you if it were me I would go with more spring pressure. 250 on the seat and 650ish open...Seems like everything looks better with more spring pressure from what I have seen....But I could be wrong :-


Looking at 250 seat and minimum of 750 open. Closer to 800 open.

Author:  jmarkaudio [ Mon Jan 07, 2013 4:48 pm ]
Post subject:  Re: New Camshaft

It's a lot of exhaust duration, and opens real slow from the looks of it.

Author:  shrinker [ Mon Jan 07, 2013 5:33 pm ]
Post subject:  Re: New Camshaft

That exhaust looks like one of those rumpty rumpty idle cams or what they call them. I think the exhaust is closing WAY too late.

Author:  scoop [ Tue Jan 08, 2013 6:11 am ]
Post subject:  Re: New Camshaft

Do you already have this cam? Did you try to call Bullet or Cam Motion? Bob J

Author:  us7race [ Tue Jan 08, 2013 9:56 am ]
Post subject:  Re: New Camshaft

Yes I already have the camshaft. Should be worth a shot anyway. Not sure if my heads have enough cross section to let it work in the RPM range it wants but I guess we will see.
MCSA of my heads are 2.73 If I remember right.

Author:  MCEcomp [ Thu Jan 10, 2013 2:45 pm ]
Post subject:  Re: New Camshaft

I used a very similar Crane cam in a 434 with 14.1comp and it ran real well with that slow exhaust lobe....

Your crane cam will be very dynamically stable to high RPMs,,,question is will your heads and intake get there

Author:  rick360 [ Thu Jan 10, 2013 9:47 pm ]
Post subject:  Re: New Camshaft

That's more duration @ .050 than I'd have used. The advertised duration looks like a lot more than normal since they give those at .012" of tappet lift and most others use .020" for advertised duration on solid roller cams.

Where does your converter stall? That will be the important thing when going to a big duration cam like this.

Rick

Author:  us7race [ Thu Jan 10, 2013 10:00 pm ]
Post subject:  Re: New Camshaft

Rick it was going 5600 with the old cam and Intake. Where should it be? Crane I am not sure if they know said 5000 or so. Will mine be ok?

Author:  rick360 [ Fri Jan 11, 2013 10:54 am ]
Post subject:  Re: New Camshaft

us7race wrote:
Rick it was going 5600 with the old cam and Intake. Where should it be? Crane I am not sure if they know said 5000 or so. Will mine be ok?

Hard to say where it "should" be w/o dynoing the engine. If it were gas I know it would want stall over 6k, but with alcohol it may be ok being less with the extra mid-range torque that comes with it. Try it and see what your 60' does. You'll probably want it advanced some for best ET.

Going big on duration usually reduces torque w/o making more HP (or very little more) and moving the rpm of peak TQ higher.

Rick

Author:  us7race [ Fri Jan 11, 2013 5:16 pm ]
Post subject:  Re: New Camshaft

They told me the cam was at 108 straight up and to advance it 4° to bring the RPM down some. Hopefully the new cam will make the heads shine. They peaked at 336@.700 and at .800 did not check .900 lift numbers. Just have a kinda small MCSA at 2.73 (pushrod Pinch Area). I use a 1207 Felpro Gasket for the intake ports.

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