Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 17
Views: 7,056
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 17
Views: 7,056
Re: Dreaded Upper Cam Chain Guide Failure
Thank you for your contributions. I have three questions:
If you don't mind me asking, what did you have the cam covers off for?
What do you think causes the wear strip to fail?
What is your...
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 17
Views: 7,056
Re: Dreaded Upper Cam Chain Guide Failure
The only way I know to test oil pressure is to put the whole thing back together, hook a test gauge up, and start the engine. I'm not opposed to doing that but at this point it has been suggested to...
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 2
Views: 2,554
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 4
Views: 2,481
Re: Advice for liners?
Just a novice $.02
If you can accomplish that task without damaging anything, it doesn't sound like a bad idea. Resealing would be better than putting the entire engine back together just to find...
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 17
Views: 7,056
Re: Dreaded Upper Cam Chain Guide Failure
I do own a fairly decent flexible endoscope and I actually did find what I believe to be the largest pieces of both facings...
I discovered the drivers side facing was resting just under the...
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Forum: C4 ZR-1 Technical Postings
3 Weeks Ago
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Replies: 17
Views: 7,056
Re: Dreaded Upper Cam Chain Guide Failure
I've got the battery disconnected at the moment, but if memory serves correctly the odometer reads around 162,000 mi. A prior owner had the engine gone though by Marc at around 124,000 mi some time...
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Forum: C4 ZR-1 Technical Postings
4 Weeks Ago
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Replies: 17
Views: 7,056
Re: Dreaded Upper Cam Chain Guide Failure
I finally managed to get the driver's side cam cover off after removing the brake booster.
If anybody is curious, the solution to the brake booster removal was ultimately removing some of the...
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Forum: C4 ZR-1 Technical Postings
4 Weeks Ago
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Replies: 17
Views: 7,056
Re: Dreaded Upper Cam Chain Guide Failure
There have been no unusual noises. I simply discovered the steel in the oil during a routine oil change. I know it sounds crazy, but there were zero "symptoms" leading up to this discovery.
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Forum: C4 ZR-1 Technical Postings
03-06-2025
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Replies: 16
Views: 7,730
Re: 90' Intermittent power - Spark problem
From what I gather, you say that the spark on #5 looks/sounds like it's more frequent than any of the adjacent cylinders at any given RPM, and provides no change to RPM when unhooked?
That coupled...
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Forum: C4 ZR-1 Technical Postings
03-06-2025
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Replies: 17
Views: 7,056
Dreaded Upper Cam Chain Guide Failure
Last time I did my yearly oil change (a couple months after the pandemic hit,) I discovered steel glitter in the oil. I parked the car, set it up for hibernation, and haven't driven it since (except...
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Forum: C4 ZR-1 General Postings
03-05-2025
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Replies: 77
Views: 37,319
Re: Mileage
Can't turn the ignition on right now to check. Haven't driven it in quite a while. Last time I looked, I think it was nearing 170,000mi. Marc went through the engine at around 124k, so does it still...
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Forum: C4 ZR-1 Technical Postings
01-24-2025
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Replies: 16
Views: 22,965
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Forum: C4 ZR-1 Technical Postings
07-26-2023
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Replies: 5
Views: 6,267
Re: Infinity Lube
The info in the advertisement sheet says "900 degree flash point." At the bottom in the fine print it says "believed to be accurate at time of issue."
MSDS says 270 degree flash point.
False...
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Forum: C4 ZR-1 General Postings
06-19-2023
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Replies: 4
Views: 2,205
Re: LT5-Powered 1958 Corvette Restomod
Aside from the horrendous headlights, they got rid of two of the '58s most defining features, the tail lights and the sail exit exhaust. I understand the want for restomodding (fuel injection, newer...
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Forum: C4 ZR-1 General Postings
12-18-2022
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Replies: 6
Views: 1,508
Re: Road&Track June 1990 - Mid-Engine ZR-1
I believe they started on the Indy (Later called the CERVIII) in 1986.
I personally think the Indy/CERVIII was a better looking car than this Bertone concept.
I've read that one of the...
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Forum: C4 ZR-1 General Postings
12-03-2022
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Replies: 12
Views: 2,236
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Forum: C4 ZR-1 General Postings
12-02-2022
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Replies: 12
Views: 2,236
Re: Corvette to become it's own "brand"
Aside from the original subject of the article, Sean Tucker needs to rethink his job as an author. Zora did not draw up, design, or create in any way- the original Corvette. This extreme flaw in the...
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Forum: C4 ZR-1 Technical Postings
03-29-2022
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Replies: 5
Views: 4,754
Re: 92 Tire Tube - How Much Weight Can It Hold ?
It can carry more than 30lbs... keep in mind it was indended to carry a front tire and wheel (Or just any regular tire and wheel on a non-ZR-1 C4.) This is why the "tracks" in the sides of the spare...
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Forum: C4 ZR-1 Technical Postings
03-14-2022
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Replies: 69
Views: 22,077
Re: Which coil pack do you have?
I have nothing against running the factory stuff, however you're the first person I've seen who said they had problems with magnecor wires. They do come with a lifetime defect warranty. I've had a...
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Forum: C4 ZR-1 Technical Postings
02-13-2022
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Replies: 69
Views: 22,077
Re: Which coil pack do you have?
My '92 had what appeared to be an original set when I replaced my injectors in '17. They all had cracked housings. I put MSD's in and so far haven't had any problems. After seeing this thread, I...
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Forum: C4 ZR-1 Technical Postings
01-26-2022
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Replies: 9
Views: 2,616
Re: EPROMS Deteriorate?
Yeah this sounds like BS marketing. I know it's not a ZR-1, but I've got an '87 Mazda RX-7 ECU with over 230k miles on it that still works like it was new.
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Forum: C7 ZR1 General Postings
12-22-2021
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Replies: 5
Views: 8,375
Re: LT6 dyno runs
I doubt they'd waste the paper. If they do archive any data from a dyno test, it would likely be stored on a database.
Sent from my BBF100-2 using ZR-1 Net Registry mobile app...
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Forum: C7 ZR1 General Postings
12-22-2021
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Replies: 5
Views: 8,375
Re: LT6 dyno runs
Seems highly doubtful.
These initial dyno runs are more for an internal final inspection and initial run-in, not for power output 'records.' They already know what the engine is supposed to make;...
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Forum: C4 ZR-1 General Postings
11-09-2021
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Replies: 12
Views: 1,952
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