I see you!

[Jeffvette]

http://www.pnwzr1.com/images/Eye.JPG

[LGAFF]

Is that off the MN car with the cam failure?


LGAFF
92 ZR1
#234

[Jeffvette]

Is that off the MN car with the cam failure?


LGAFF
92 ZR1
#234


No, that car is currently at DRM.

[Pete]

Start talking Jeff,if not just one question.

Is that a stock motor?if not what mods?

Pete

[Locobob]

It's a cam inspection porthole - still in prototype

[Pete]

It's a cam inspection porthole - still in prototype


Yeah, i've been seeing lots of those lately.

I hope it ain't what i think it is.
If so that sucks.

Pete

[Locobob]

Yeah, i've been seeing lots of those lately.

I hope it ain't what i think it is.
If so that sucks.

Pete

It's not a lifter failure if thats what you're thinking

[tf95ZR1]

Someone REALLY wanted a cam cover emblem

[IowaZR-1]

looks like Jeff is experimenting with new types of curing for powder coating......scratch the laser idea.......now where's the J-B Weld?

[cuisinartvette]

Jeff, looks like a fine young man got ahold of your parts. :mrgreen:

[HIZNHRZ]

Yeah, i've been seeing lots of those lately.

I hope it ain't what i think it is.
If so that sucks.

Pete

Pete, what do you mean you've been seeing lots of those lately?

[tomtom72]

Raisin' my hand from the back of the room:hello:....what broke? Cam shaft? :confused:

:o

[DDSLT5]

Cam Shafts are fine. I'll let Robert tell the rest of the tale - he is the one with the story! It is a freak failure - I've not seen it before.

[LGAFF]

Cam Shafts are fine. I'll let Robert tell the rest of the tale - he is the one with the story! It is a freak failure - I've not seen it before.


Did someone think you hammered in the cam cover bolts???????????

Hey, lets cut to the chase, I'm getting alittle paranoid:jawdrop:

LGAFF
92 ZR1
#234

[Locobob]

What happened was the rear camshaft retaining cap broke off and was subsequently caught up on a cam lobe and driven into the cover. The result as you can see is a pretty big hole in the cover. The cap is still in place with both bolts securly fastened, it was the center section of the cap that fractured and came off. My guess is some sort of casting defect or stress crack is the root cause, no other damage is apparent. I never heard anything funny and the car drove just fine. Had I not noticed the wisps of smoke from the buring oil coming from under hood I would have just kept on driving - unaware of any problem. I have already repaired the cover with an artfully welded on patch, should be almost invisible once it's cleaned up and repowdered. Since I'm into the motor though I'll be taking this opportunity to make some upgrades including some additional head porting and a set of Pete's camshafts.

[Jeffvette]

http://www.pnwzr1.com/images/IMG_2455.JPG

http://www.pnwzr1.com/images/IMG_2467.JPG

[Nick]

Rob, what were the operating parameters of the motor when it let go, i.e., were you hammering on it, driving in your usual sedate manner, etc.? Post pics of the repair. :thumbsup:

[Locobob]

Rob, what were the operating parameters of the motor when it let go, i.e., were you hammering on it, driving in your usual sedate manner, etc.? Post pics of the repair. :thumbsup:

Cruising on the freeway in 6th gear when I noticed the problem, don't think it was induced by any throttle mashing.

[Zr1 Destroyer]

Wow....I wonder if the retainer was over tourqed?

[Jeffvette]

Wow....I wonder if the retainer was over tourqed?


Will find out when we bust it loose. Either a casting flaw, over torqued, or some dip used the retainer to seat the cams instead of the special tools.

[tomtom72]

May I ask a novice question? :redface:

The only cam shafts I've ever seen came out of sbc iron motors from antiquity. I used to hear mechanics refer to something called "leoparding". Those tiny black spots on the cam lobe pictured are normal or is that what those guys were talking about?

TIA :worship:

:cheers:
Tom

[Zr1 Destroyer]

or some dip used the retainer to seat the cams instead of the special tools.I could see that happening.....bummer, but it did make a nice glory hole!:dancing