ZZ4 cam install confusion?
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Joined: Jan 2001
Posts: 436
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From: Ft. Worth, TX
Car: 89 Turbo Trans Am and lots of non-3rd gens
Engine: 231 SFI Turbo's, LT4, LT1
Transmission: 2004r, 4L60E
ZZ4 cam install confusion?
Ok, maybe I'm completely confused or can't remember crap. I've installed my new ZZ4/ZZ3 cam and a new Rollmaster double chain.
When the 2 "dots" are lined up, (crank at 12:00, cam dot at 6:00) the piston is at TDC, but the cam has just finished the exhaust stroke and is about to begin the intake stroke!
Shouldn't the cam have just completed the intake stroke and then the "Dots" should align at the completion of the compression stroke at TDC and not the completion of the exhaust stroke?
(I'm looking at the #1 cylinder, drivers side front BTW)
This has completely confused me because I thought you bring it to TDC compression (when dots align, to install the distributor with the rotor pointing right at the #1 terminal on the cap)
Thanks
------------------
Rob
High Performance & Party page
Pics of my rides past & present and recent party pics!
89 TTA #426 20th Anniversary turbo 3.8 bone stock
79 TA 6.6l - all original stock
94 Silverado Tuned Port Injected
87 Grand National- lil' ole V6, 12.40 @ 108 w/1.79 60'
95 Trans Am Conv.- LT1
When the 2 "dots" are lined up, (crank at 12:00, cam dot at 6:00) the piston is at TDC, but the cam has just finished the exhaust stroke and is about to begin the intake stroke!
Shouldn't the cam have just completed the intake stroke and then the "Dots" should align at the completion of the compression stroke at TDC and not the completion of the exhaust stroke?
(I'm looking at the #1 cylinder, drivers side front BTW)
This has completely confused me because I thought you bring it to TDC compression (when dots align, to install the distributor with the rotor pointing right at the #1 terminal on the cap)
Thanks
------------------
Rob
High Performance & Party page
Pics of my rides past & present and recent party pics!
89 TTA #426 20th Anniversary turbo 3.8 bone stock
79 TA 6.6l - all original stock
94 Silverado Tuned Port Injected
87 Grand National- lil' ole V6, 12.40 @ 108 w/1.79 60'
95 Trans Am Conv.- LT1
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
#6 is on compression. Don't know why, but that's the way it's done. If both dots are at 12 o'clock, you're on #1.
Now, my old '57 283, dots together was #1. Go figure.
Now, my old '57 283, dots together was #1. Go figure.
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