My first cam install

Author Topic: My first cam install  (Read 4621 times)

Offline UKcuda

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Re: My first cam install
« Reply #45 on: May 27, 2009 - 11:25:58 AM »
Quote
Just trying to get it into my head what's going on.

With the timing mark at 0, the cam and crank gear dots are facing each other.
Then the piston for Cyl#1 is NOT at TDC. Cyl#1 should fire at somewhere around TDC.
By turning the rotor 180°, the rotor will be at firing position for Cyl#6, which at this point is close enough to TDC to have a engine that will start.

Right?

Nearly right.  No 1 is always at TDC when timing is at "0" (or should be if your damper is not broke).

The thing is there are two TDCs because the crank goes round twice as the cam goes round once.  It will only fire on one of them.

The TDC you want is at the top of the compression stroke, the other is the top of the exhaust stroke.

If No1 is at top of exhaust stroke then No6 will be at top of compression stroke - so you need to "put" the spark there, hence swapping the rotor or plug leads round 180 deg.

Willard's way lets you check what stroke you are on. 

Another way to check is to whip off the cover and see when both rockers for that cylinder are moving together - this is the valve timing overlap that happens at the top of the exhaust stroke. 

At top of compression stroke neither of them will be moving.
« Last Edit: May 27, 2009 - 11:29:43 AM by UKcuda »
'72 'cuda




Offline moper

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Re: My first cam install
« Reply #46 on: May 27, 2009 - 12:03:09 PM »
For a while I was nicknamed King 180 because I always put them 180° off. That was the result. UKs dead on. I would pull the plug like Willard says and turn it over to make sure.

Offline Ornamental

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Re: My first cam install
« Reply #47 on: May 27, 2009 - 02:23:41 PM »
That's a useful tip! :thumbsup:

As of now, the engine seems to be an engine again, as opposed to the boat anchor it's been lately.
 :woohoo:

This wouldn't have happened without the patience and good advice from you all!
Thank you very VERY much, all of you!  :2thumbs:


After turning the rotor 180°, it fired up, but not too good. Died after about a second. Even had a nice flame inside the air filter. But it fired.
So I advanced the timing, got a little better, but died rather quickly again. Turned the distributor housing some more counter-clockwise, and it fired up good. Had to encourage it a little on the throttle, but it was firing stable and I was soon able to keep it at 2K RPM.

Naturally, it overheated, so after 10 mins, I shut off, and let it cool a little. There was a bad coolant leak from the upper radiator hose, due to the hose clamp deciding to give up the fighting spirit in the heat. Had to top up with some water.


10 more minutes, and yet again overheated, but by now the cam has run at 2K RPM for 20 mins.
Changed oil, changed from pure water to antifreeze mix coolant, and now I only have to hook up the Lokar throttle wire, and kickdown wire before I can take the Chally out for a spin!
Might have to adjust the idle too, but I have a couple of Holley books that should help me sort that out.




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

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

***Per Arne***

Offline willard

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Re: My first cam install
« Reply #48 on: May 27, 2009 - 03:54:58 PM »
congratulations!  :cheers:
1970 383 R/T SE

Offline MEK-Dangerfield

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Re: My first cam install
« Reply #49 on: May 27, 2009 - 06:01:04 PM »
You aren't the first person to put the distributor in 180* out.    :banghead:   :banghead:   :banghead:

Mike

1970 Challenger - SOLD
2016 SXT+.  1 of 524 SXT+'s in Plumb-crazy for 2016.

Offline bb71challenger

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Re: My first cam install
« Reply #50 on: May 27, 2009 - 06:27:59 PM »
Dont ask me about the time I put my 383 distributor on the shelf next to my 340 distributor. They look virtually identical. I did not know it and put the 340 one back in when I changed cams on my 400. You can imagine what kind of things were going through my mind when swapping it 180 out still did nothing for it. I finally snapped to what I had done, man the guys at Moparnuts.com had a field day with that one  :banghead:
1971 Challenger (OO==== ====OO) getting close!
1970 Challenger (OO########OO) long ways off
*Brett*