Author Topic: My first cam install  (Read 4633 times)

Offline Ornamental

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My first cam install
« on: May 05, 2009 - 01:09:56 PM »
I'm doing my first cam install this weekend, and I have a few things I wonder about. The positions of  a few thing. I made a drawing, and just want to verify with you people that I'm on the right track.
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Grey '70 Challenger R/T

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Offline willard

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Re: My first cam install
« Reply #1 on: May 05, 2009 - 03:10:41 PM »
i'm just swaping mine ina 383 and aligning dots will not take place in cyl 1 TDC. just align the marks, then turn the crank to TDC, put in dist drive so its slot is parallel to camshaft centrline, then put dist in,  pointing at your cyl 1, and the rest is simple.
1970 383 R/T SE

Offline UKcuda

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Re: My first cam install
« Reply #2 on: May 05, 2009 - 05:51:49 PM »
Quote
i'm just swaping mine ina 383 and aligning dots will not take place in cyl 1 TDC. just align the marks, then turn the crank to TDC, put in dist drive so its slot is parallel to camshaft centrline, then put dist in,  pointing at your cyl 1, and the rest is simple.

Am I missing something here - I've fitted a lot of cams and that sounds pretty whacky to me !  I can't actually understand what it means ?

Anyway, Ornamental you are going about it the right way because you are aiming to understand what everything does and why - if you follow that philosophy you can't go far wrong.

For a basic cam install (without degree wheels and such like) you only need to understand a little bit about centerline and advance/retard so as to be happy that your "straight up" install is going to be what you want.  If you got a branded cam then that's probably a given.

Beyond that, just remember that the cam sprocket goes round 180 while the crank goes round 360.

If you are changing out an old cam it's even easier as the cam and crank are already in about the right place when you take the old timing set off.

So - within those parameters - put the crank to TDC on No 1 and turn the cam so that the valves are on the overlap (both No 1 valves are rocking).  Then line up the dots on the sprockets as you slip the chain and sprockets over (you need to play around a bit taking it on and off with different teeth to make sure you got it right).

And that's it (apart from putting all the other bits back on).

Then check the ignition timing and if it isn't somewhere near right straight away then it's probably 180 degrees out.
« Last Edit: May 05, 2009 - 06:33:05 PM by UKcuda »
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Offline Chryco Psycho

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Re: My first cam install
« Reply #3 on: May 05, 2009 - 08:22:22 PM »
typically with the cam gear at 6 o-clock the dist wil be firing #6 not 1 , to fire #1 the cam gear needs to be at 12 o-clock

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Offline bb71challenger

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Re: My first cam install
« Reply #4 on: May 05, 2009 - 09:01:13 PM »
Any way you can borrow a degree wheel? If you search just a bit you can find all you need to know about degreeing in a cam. The good thing about using a degree wheel is that you know exactly what you have. It is really not that much more involved than what you are already going to do and you have peace of mind knowing exactly where the cam is. Its nice to use a dial indicator also and again it might sound scary but its actually pretty simple and a great tool.
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Offline Oldschool

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Re: My first cam install
« Reply #5 on: May 05, 2009 - 09:05:03 PM »
 :iagree:   This is about as easy and straightforward as I have been able to find.  Short and to the point.    :2thumbs: 


http://www.lunatipower.com/Tech/Cams/HowToDegreeACam.aspx 

Ken  --  In Georgia

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Offline willard

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Re: My first cam install
« Reply #6 on: May 06, 2009 - 12:22:13 AM »
Sorry for  unclear enlish, I only wanted to warn him that TDC of #1 cyl does not occur (as chryco says in most cases) in the same time as aligning the dots 6 and 12 o'clock. If he tries to have these 2 events at the same time it can never happen ;)
« Last Edit: May 06, 2009 - 12:49:20 AM by willard »
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Offline moper

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Re: My first cam install
« Reply #7 on: May 06, 2009 - 12:08:53 PM »
Per, it's not hard. But you should get a degree wheel if you want to be sure of things. Like CP says.. both dots point up, use a straightedge to verify they are lined up. IIRC, the oil pump drive slot on  a small block should point at cylinder 1 in order to have the right swing in the distributor and vacuum dashpot without hitting the intake.

Offline Chryco Psycho

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Re: My first cam install
« Reply #8 on: May 06, 2009 - 09:43:56 PM »
 I usually line the dots up at 6 cam gear & 12 crank gear as it is the easiest way to line them up , then just rotate the crank 360* to get firing for #1 cylinder

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Offline Aussie Challenger

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Re: My first cam install
« Reply #9 on: May 08, 2009 - 01:41:17 AM »
I usually line the dots up at 6 cam gear & 12 crank gear as it is the easiest way to line them up , then just rotate the crank 360* to get firing for #1 cylinder
   :iagree:   Make sure you turn crank clockwise and when the crank has been rotated twice make sure that the dots line up. Turning clockwise also takes all the slack out of the timing chain, if you need to further line up the dots by turning the crank counter-clockwise, re-do the assembly as the cam will be out. As stated above a degree wheel really helps especially if the cam won't line up then you may need an offset key or a different sprocket.   :cheers:
Dave

Offline Ornamental

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Re: My first cam install
« Reply #10 on: May 08, 2009 - 02:11:05 PM »
I've just come home from a couple of days travel after five weeks of work at sea, and got online home again. So now I'm able to thank you all for the very helpful replies!
I will get some more tools before I start up the work.  ;)

I'm replacing an old cam, but I don't know that the previous install was done 100% right.
Better to learn how to do it properly, and be absolutely sure it's good.

It does sound like a lot to get right, but I think that once it's done, it's nothing to it, just to do it.
Again, thank you all a lot for pointing me in the right direction! :thumbsup:
Panther Pink '72 Challenger Rallye.
Grey '70 Challenger R/T

-There are two kinds of pedestrians: The quick and the dead.

***Per Arne***

Offline Ornamental

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Re: My first cam install
« Reply #11 on: May 11, 2009 - 08:55:05 AM »
I went to a tool store today to buy a dial indicator and a magnetic base stand. The price almost floored me, so the guy behind the counter said he could give me a discount. Price after discount, approx 410 USD.  :22yikes:

The Lunati kit used in the link Oldschool posted cost 55 USD at Summit, but ship date is 24'th of may, and then there's some shipping time. :(

So since I'll be replacing an old cam, I'll install the cam without the dial indicator, as described by UKcuda. And I won't try to have the two dots aligned while cyl#1 is at TDC, as willard stopped me from doing.  :2thumbs:

Panther Pink '72 Challenger Rallye.
Grey '70 Challenger R/T

-There are two kinds of pedestrians: The quick and the dead.

***Per Arne***

Offline Chryco Psycho

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Re: My first cam install
« Reply #12 on: May 11, 2009 - 11:27:12 AM »
that is stupid , I have seen them on sale here for aorund $30 & I would be happy to ship one to you if you need

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Offline the_engineers

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Offline Ornamental

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Re: My first cam install
« Reply #14 on: May 11, 2009 - 04:59:07 PM »
that is stupid , I have seen them on sale here for aorund $30 & I would be happy to ship one to you if you need
Thank you very much!

But I've found a Norwegian webshop that have them at about that price.
I'll try to buy from them, should work out ok.

the_engineers, thank you for the link anyway,it's appreciated!
Panther Pink '72 Challenger Rallye.
Grey '70 Challenger R/T

-There are two kinds of pedestrians: The quick and the dead.

***Per Arne***