Update on the Zilla - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-08-2008, 06:21 PM   #1
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Default Update on the Zilla

It was running great, and fueling was coming back around, then Thursday morning I ended up with a supercharged 4-cylinder.

Pulled the front three plugs and found the #5 fouled badly with fuel (that'* good news, because these bigger injectors were spendy). Immediately went to the rear bank and pulled the #2. Fuel fouled also. The 2/5 coil tested good with an ohmmeter, but it has a high-current short for sure. Only a megger (megohmeter) will show it, and I plan to do that monday at work.

MSD coils lasted quite awhile, and I can't complain. We'll have a black OEM replacement for a bit, but I'm also taking the time to tear the top end off again. Time to put the CompCams lifters back in. This motor was assembled with the replacement motor'* lifters, and I have some universal valvetrain noise. I'd custom-selected the length of my pushrods for the shorter preload of the compcams, but had pulled those for what I thought was a ticking lifter last year. I know now that it was a bad wristpin on the #1.

I'm fighting a little bit of the flu, so I'll take this one slow as I feel up to it. This'll also give me a chance to inspect the intercooler up close.
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Old 03-10-2008, 11:34 PM   #2
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Tinkering while recovering from the flu.

Here'* the plugs. See the problem?
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Checking the coil and wires. Notice the exposed intercooler line (showing green) behind the SC? I have a small leak back there, so it'* just another reason to pull the top end.
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Now onto the meat of the work. I used the OEM lifters from the donor motor. I had Performance CompCams lifters in the Zilla last summer, and thought one was bad, but it turned out to be a wrist pin. I had originally had these pushrods made to take the 1.8 rockers and CC lifters into account, and as such, they're a LITTLE loose with OEM lifters. The CompCams are now back in, valve covers back on, and some updates going on with the LIM/SC:
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New pushrods fit MUCH better now. Zero play in the 'closed valve' locations. But they still JUST spin by twirling with fingers. Rocker and pushrod wear are perfect so far. I also found my rear engine hoist bracket loose, right above the one and only knock sensor, which may have been giving me some false knock.

All tucked in for the night:
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Old 03-11-2008, 12:36 AM   #3
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Heh, ya you were running on 4 cylinders.

You must go thru a lot of gaskets.
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Old 03-11-2008, 01:18 AM   #4
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I have enough gaskets on hand at any given time to do the top ends on both cars at the same time.

When I use a set, I buy a spare to set on the shelf in it'* place (most small gaskets). This time, I didn't have a spare set other than a low-mileage used set for the LIM, so I bought new. Not using them though. I'm re-using what came off the motor. They came off undamaged and perfectly clean (still attached at the corners).
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Old 03-11-2008, 11:15 AM   #5
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Your car sure aint shy to show her insides!
Glad to see you havent had a meltdown lol
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Old 03-11-2008, 11:18 AM   #6
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Neighbor asked me how many times I've ripped through the top end. I had to stop and count.

4 times on the old motor, twice on this one (this car only). Twice on the other one.
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Old 03-11-2008, 11:16 PM   #7
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Oddly enough, the 2/5 coil didn't test bad with a Megger. Not sure what'* going on, but we've seen internal problems brought on by both vibration and heat, so I'll use the SLE over the next few days to test all three coils while the Zilla is still torn down.

Meanwhile, I'm playing with paper cutouts again. Good thing I have a few spares:


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Vocabulary lesson for the day:

Quote:
pro·to·type /ˈproʊtəˌtaɪp/ Pronunciation Key - Show Spelled Pronunciation[proh-tuh-tahyp] Pronunciation Key - Show IPA Pronunciation noun, verb -typed, -typ·ing.
–noun
1. the original or model on which something is based or formed. While it may be very ugly, it may also be quite capable. Beauty is in the eye of the beer-holder, and you can't see this sucker with my sexy black supercharger blocking your view.
--------------------------------------------------------------------------------

[Origin: 1595–1605; < NL prōtotypon < Gk prōtótypon, n. use of neut. of prōtótypos original. See proto-, type]
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Old 03-11-2008, 11:20 PM   #8
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Quote:
Originally Posted by willwren
Vocabulary lesson for the day:

Quote:
pro·to·type /ˈproʊtəˌtaɪp/ Pronunciation Key - Show Spelled Pronunciation[proh-tuh-tahyp] Pronunciation Key - Show IPA Pronunciation noun, verb -typed, -typ·ing.
–noun
1. the original or model on which something is based or formed. While it may be very ugly, it may also be quite capable. Beauty is in the eye of the beer-holder, and you can't see this sucker with my sexy black supercharger blocking your view.
--------------------------------------------------------------------------------

[Origin: 1595–1605; < NL prōtotypon < Gk prōtótypon, n. use of neut. of prōtótypos original. See proto-, type]

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Old 03-11-2008, 11:22 PM   #9
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Quote:
Originally Posted by willwren
and you can't see this sucker with my sexy black supercharger blocking your view.
LOL that is great!


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Old 03-11-2008, 11:23 PM   #10
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While the pics above may be disturbing to some, those that have been here recently know I have an identical un-molested heat exchanger core sitting on the shelf brand new in the box. I bought two.
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