This was actually an easy project with the correct tools. The cam is a Crane 208/216 .500/.500 on a 112.6 lsa <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

There is a very noticeable difference in this cam from the stock '99 cam it had in it before. There is a slight lope now and it sounds reeealy gooood. Also installed were Comp 918 springs and titanium retainers as well as Thunder Racing's 7.400 heat treated pushrods.

Check my signature for the good stuff...and post up any questions <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

<small>[ November 21, 2002, 04:20 PM: Message edited by: Ryan23silverado ]</small>

 

Well, what are your impressions of this cam? Is this a crane cam, and if so, whats up w/ the 112.6 LSA?

 

Well, I can say that there is an increase in midrange and upper RPM power. I deffinitely need tuning to raise the shift points. It really wants to pull past 5300rpms but cannot with the stock tuning. There is a hill by my house that the truck used to have to downshift to get up, but with this cam it no longer has to do this. And it is not stressing to pull up the hill without downshifting too. So there are very noticeable torque gains down low as well with this cam. I wanted something that was very streetable, and that it is. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

BigTex, I had Thunder Racing do a cam doctor on this cam. Doing calculations with the base circles, the exact lobe seperation angle worked out on this specific cam to be 112.6 (close to Crane's advertised 113 lsa). Almost no cam comes out to the exact specifications for lsa that is advertised. (I don't even know if there would be much of a difference on 0.4* seperation - maybe someone knows?) <img border="0" alt="[Fluffy]" title="" src="graemlins/fluffy.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Jason99T/A
--posted November 20, 2002 09:49 PM

It's very easy once you know what you are looking at.

Look for the .050" lift column for I1 (intake lobe 1) and E1 (exhaust lobe 1). The number listed directly to the right of this number is your duration at .050" lift. If you ordered a 224 cam, this number should be 223-224 degrees or so.

To find your max valve lift, locate the "peak lift" column. This is your peak lobe lift on the cam. Take this number and multiply it by your rocker arm ratio. Stock is 1.7:1. For instance, the 224 lobe has a peak lobe lift of ~0.332". So, this would be 0.332" * 1.7 = .564"

To find your lobe separation angle, take the I1 centerline and the E1 centerline, add them together, and take half of that. So, for example if your I1 centerline is 108* and your E2 centerline is 116*, you get 108+116 = 224*/2 = 112* LSA.

This should cover most of it. Let me know if you have any other specific questions.

Jason
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Here are the information sheets for my cam that Jason is talkin about on another guys car.
http://www.picturetrail.com/gallery/...767&uid=552911

 

I am glad you like it. It will require some minor tuning but it will pull all the way to 6200 rpms if you let it.
Mine is still a little rich at idle but I plan on getting a MAFT to fix that. Also I am running a little lean on the top end. Getting only 17 degrees advance with 8 degrees retard at WOT but that is on 89 octane. I need to TechII it again to see where I am at. Maybe my injectors are maxed out. Will have to check the duty cycle at WOT and then I can go from there.

 

how does it sound. Does it have and crisp kinda crackle in the idle?

 

I need to get my autotap back from my buddy to check how it is running as far as timing and if there is any KR at WOT.
RED2K- the idle is noticeably louder from the increased duration on int/exh. It lopes when it is at 500rpm idle. Hey if anyone knows how to get sound clips posted I would certainly do it. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

u need long tube headers now

 

how would i be able to find out what kinda of cam would be good in a 4.8 with gas on it? not to many people do cams on these new trucks yet so hard to find good info on one.

brent

 

Looking good Ryan! We put a 212/218 cam in a '00 5.3l truck last year and it REALLY woke it up. I had a feeling the the small Crane cam you are using would work well in the 5.3l trucks.

Jason