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 Post subject: cam
PostPosted: Thu Jun 11, 2009 11:31 am 
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Is it really worth all the effort to degree a cam in with all the new technology that goes into the making of them.
also i thought that was what the different keyed crank sprockets were for to save the trouble.
i have heard most people go back to the original marks anyway.

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 Post subject: Re: cam
PostPosted: Thu Jun 11, 2009 11:35 am 
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I think its worth the extra time to check it, it wont take much time.

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 Post subject: Re: cam
PostPosted: Thu Jun 11, 2009 3:28 pm 
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so it isn't too much trouble or complicated. I know I will have to buy a couple tools i think

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 Post subject: Re: cam
PostPosted: Thu Jun 11, 2009 8:51 pm 
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From what I heard it is worth it. I have seen it done on tv but have never done it myself so I have no clue on how to do it. A few years ago I was talking to a racing buddy and he told me this story. Someone he knew had his race car running good. Over the winter he had someone freshen up the engine. The next year the car wouldn't run the numbers it use to. He had someone degree the cam and the performance came back.

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 5:21 am 
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Hmmmm. i have looked at instructions on the net and it doesn't look too bad. I just need to get a degree wheel . dial indicator and pointer of some kind and a piston stop.
I really thought all the keyways marked on my crank sprocket I have just did it automatically. Now i don't know what the are for. I am ready to set my motor on the frame and was wanting to get everything done before i put the front clip on like setting the valves and stuff.

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 7:45 am 
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The bigger the degree wheel the easier it is to do.

You degree the cam on the O degree mark then use one of the others to +/- to get to the desired setting.

For the average joe the O setting is close enough on the average but there are exceptions that need addressed so degreeing is best.

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 7:48 am 
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So why can't I just set the crank gear on 2 or 4 or 6 advanced and be done with it.

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 8:28 am 
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litemup wrote:
So why can't I just set the crank gear on 2 or 4 or 6 advanced and be done with it.


Because a lot of performance cam are ground with some advance already. If you use say, the 6 degree key, and the cam is ground 4 advanced, that is 10 degrees total, not good. It's best to check, and pretty easy to do. You can make a stop with an old plug and a bolt, just knock out the ceramic and tap the center. Watch the valves on #1 to get you close, then use the degree wheel to make sure you are at top dead. Do this by rotating the motor by hand in both directions, until you get the same amount on the wheel in both directions, you can screw the bolt in the old plug to adjust the stop for this. You can make a pointer out of a clothes hanger, and use one one of the bolt holes that is on the front of the block to mount it...

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 9:44 am 
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I see. So I guess I can't degree the cam with the timing cover on in the truck then can you.

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 3:55 pm 
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Not with the timing cover on. Too many things you can not check and need access to the cam gear and crank shaft gears if you need to advance or retard the cam. I always like to turn the engine in the normal way it rotates so you do not have slack in the timing chain. I have always used "True Roller" timing gears and chains.

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 7:28 pm 
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I figured as much. So what is the extra keyways for then on the crank gear. I have 9 different ones for advance and retard plus 0. What good are they if you can't change the sprocket even with my 2 piece cover.
anyway I guess I will just time it like always with the dots. I also have the billet true roller double chain.

Guess I will go with the keep it simple stupid metod LOL :ebiggrin

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 Post subject: Re: cam
PostPosted: Fri Jun 12, 2009 8:24 pm 
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Read the specs on the cam.. Hard to say. You really need a dial indicator, so you can check the lift against the spec. You can post the spec. and the reading on the valve lift and the degree wheel. It would be good if you would post all your engine specs.

Degreeing a Cam the easy way

http://69.20.53.62/pdf/803.pdf

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 Post subject: Re: cam
PostPosted: Sat Jun 13, 2009 12:50 am 
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All good engine builders will degree the cam and set to spec on cam card. All things have tolerances in their manufacturing. If all those go the wrong way, then you are going to be off.. Another thing is that to degree a cam, you need to be sure that your tdc is dead on, which will help your ignition timing to be correct. If your tdc pointer is on, you could still degree the cam, so as to know exactly where it's at.

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 Post subject: Re: cam
PostPosted: Sat Jun 13, 2009 6:27 am 
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Here is my specs on the cam.
Gross lift 531 542
Lobe lift 354 361



INT EXH
Duration at 20 279 282
at 50 248 251

Valve timing Open Closed
At .o50 Int 21.0 BTDC 47.o ABDC
EXH 54.5 BBDC 16,5 ATDC

This is for 103 intake centerline lobe separation 106

Mine is a tight lash cam to help pull throught the whole rpm range power band

Anyway none of this makes sense since I have always just lined the dots on the gears and went for it. Have never gotten this much into the cam part. So I wonder how far off I wouold be just lining up the dots as usual
Guess I set these at .o20 cold for breakin and then .016 hot for final gap.

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 Post subject: Re: cam
PostPosted: Sat Jun 13, 2009 2:33 pm 
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Quote:
Anyway none of this makes sense since I have always just lined the dots on the gears and went for it. Have never gotten this much into the cam part. So I wonder how far off I wouold be just lining up the dots as usual


A lot of us have just done that before, but if you are trying to get all you can out of it then this will help.

Check this link. It is from crane cams. It may help you understand what this stuff is about.
http://69.20.53.62/pdf/803.pdf

It makes sence after you have done one. Like adjusting your "lifters" before running your engine. That seems like a lot of work, but it is not really that bad.

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 Post subject: Re: cam
PostPosted: Sat Jun 13, 2009 3:13 pm 
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Nice reference. It is really easy to follow and very explanatory.
Thanks

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