456 Rear Bumper Cracks - Ferrari Life
 
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post #1 of 18 Old 12-10-2012, 05:00 AM Thread Starter
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456 Rear Bumper Cracks

I've looked at four cars now, and three of them had small (1-3 inch) vertical cracks in the rear bumpers. On one car, the cracks may have been the result of backing into something. But the other two had no signs of similar damage. All the cars were dark colors, TDF or black.

Any idea what causes this? Is it from the repeated heating and cooling, and thereby expanding and contracting, of the plastic?

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post #2 of 18 Old 12-10-2012, 06:55 AM
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The cracks you're mentioning were seen just above the license plate cut out yea? I've found that on a coupel cars I've inspected locally as well.

The Silver '99 here does not have those marks, nor does a 97 car in green I serviced a year or so ago. This Silver car is rough so if it were a natural wear indicator, this car would have it also. I believe they would be due to backing into something, somewhat gently and how the bumper construction responds when it flexes.


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post #3 of 18 Old 12-10-2012, 07:08 AM
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It could also be due to an earlier repair where the paint has not been applied properly, if it is rushed crazing or even cracking can occure. Especially on the rear bar where there is a far bit of temp change. It can take some time to appear after the repair is done.

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post #4 of 18 Old 12-10-2012, 08:28 AM
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My car has no cracks...yet. it is a '95 and spends a great deal of time in the outdoors except for the last two years at night whrere I now park it inside.

interesting to hear there are cracks. I suspect as you due to poor driving skills. but if VA has seen a few, then I might wonder, yet, I would still chalk it up to backing up to something and not weather wear:

What years are you looking? oder GTs or newer M series.

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post #5 of 18 Old 12-10-2012, 09:42 AM Thread Starter
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All cars were 98 or newer, the one yesterday was a 2000. The cracks are perfectly straight and vertical. Yesterday's car had absolutely no signs of other damage or indications that they'd backed into anything.

Not sure of the first two, but I know the one yesterday had no repair or repaint.

I just find it odd that they're all the same shape and size.

BTW - I drove the black 2000 Jim Lyons has for sale. I can provide feedback for anyone interested.

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post #6 of 18 Old 12-10-2012, 10:33 AM
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Quote:
Originally Posted by Killer58 View Post
All cars were 98 or newer, the one yesterday was a 2000. The cracks are perfectly straight and vertical. Yesterday's car had absolutely no signs of other damage or indications that they'd backed into anything.

Not sure of the first two, but I know the one yesterday had no repair or repaint.

I just find it odd that they're all the same shape and size.

BTW - I drove the black 2000 Jim Lyons has for sale. I can provide feedback for anyone interested.

Jim Lyons has cars usually correctly priced. You might want to still go over them with a fine tooth comb....if you want to know, nice guy aside, how I know, then PM me.

he is very amiable to having another party look it over or at least he was which when considering he has a seat for every azz , I put him in the better selling category. BUT, since he takes in all models, in all kinds of shape, it would be still prudent to have another party do a lookie-loo...just saying. He is a high vol seller who moves a ton of cars with little regard to anything but sticking on the sticker to the car as HE evaluates it. They will most likely need work.

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Last edited by Granucci; 12-11-2012 at 07:44 AM.
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post #7 of 18 Old 12-10-2012, 06:58 PM
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Cracks

Mine had this too - see pic. Like that when I got it. I didn't see any other damage on the car so I always wondered what the crack was from.

As an aside, I will say overall, the fiberglass work on these cars (interior pieces especially) are some of the worst I have seen: poor layup, poor resin penetration, marginal design, etc so this could be a factor.
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post #8 of 18 Old 12-10-2012, 07:10 PM Thread Starter
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Well, from all your input, it doesn't seem to be all that unusual or primarily due to impact damage.
So I won't be too concerned. However, it does make me wonder what they'll do long term...

Ric, PM sent.

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post #9 of 18 Old 12-10-2012, 11:33 PM
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David, I believe our mutual in San Diego does some of Lyon's service work. For some reason I believe you already know that though.


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post #10 of 18 Old 12-11-2012, 07:50 AM
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Quote:
Originally Posted by KAMF View Post
Mine had this too - see pic. Like that when I got it. I didn't see any other damage on the car so I always wondered what the crack was from.

As an aside, I will say overall, the fiberglass work on these cars (interior pieces especially) are some of the worst I have seen: poor layup, poor resin penetration, marginal design, etc so this could be a factor.

I agree on the fiberglass: Remember, best not to see how sausage is made

but that rear end. Looks like an M series. Also, I can't quite understand what is going on here. There is usually either a fixed or adj'ble under wing/foil and yours entirely looks missing.

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post #11 of 18 Old 12-11-2012, 07:53 AM Thread Starter
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No, it's there, it just hard to see because of the angle and lighting.

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post #12 of 18 Old 12-11-2012, 11:22 AM
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Quote:
Originally Posted by Killer58 View Post
No, it's there, it just hard to see because of the angle and lighting.

Duh [dusting off eyes] NOW I see it.

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post #13 of 18 Old 12-17-2012, 08:42 PM Thread Starter
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Hey Kam, now that you've had your car about a year, what's your overall assessment?
Other than motor mounts and window adjustments, any major issues?

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post #14 of 18 Old 12-19-2012, 04:56 PM
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Update

I have had the 456 for 3 and a half years. I love the car and the way it drives. Haven't had any major issues with it. I am midway though the second major on the car. The car was not all that well maintained before I owned it and I have put a lot of time into correcting the issues, mostly because I like to tinker and it is an interesting car from an engineering perspective - and when I say this, some of it makes you say, "huh?"

The car is fun to take on trips, though I have never driven a car that needed cruise control more and didn't have it than this one. Seems silly, but a 6 hour drive in the car can get to be a pain. Very comfortable car for up to 4 hours at a clip though. I will say this, I will take the car from CT to upstate NY, ~800 miles round trip, and it will run like a top for a few months after...

I pretty much daily drive the car in the summer; I try to take it to work at least 3 times a week then run errands with it on the weekends.

Work I have done:
- Interior leather redone (dash, dash gauge pod, headliner, rear shelf - twice)
- Fuel pump rubber mounts
- Major - twice (2nd in progress): belts, tensioners, plugs, etc
- Valves adjusted
- Cam seals and o-rings
- Spark plug wires - ouch
- Window fix from F1 Motorsports - both windows
- Window computer
- Driver's door harness replaced - look at the harness if having window issues...
- Radiator replaced with Ron Davis custom made unit
- Motor mounts replaced
- Rear shocks done by Delta Vee racing to cure leaking
- Added iPod connection to amp in the trunk routed to consol
- Brakes
- Coolant hoses under intake manifold
- Intake gaskets
- Fuel injectors cleaned
- Lower cam belt drive pulley fences welded

Still need to do the A-arm bushings - next year perhaps...
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post #15 of 18 Old 12-19-2012, 04:59 PM
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State of the Onion

Current state of things for fun:
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post #16 of 18 Old 12-19-2012, 06:00 PM Thread Starter
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Wow, thanks for the in-depth write-up!!

If you can, please continue to post the progress with the major and any other driver/owner impressions. That's one of the best evaluations I've read.

Are you doing all the work yourself? If not, what do you have a shop do?

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post #17 of 18 Old 12-19-2012, 07:02 PM
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Yes, many thanks, great stuff! Can I clarify two things? Is it a 456 or 456M (I'm assuming the former)? And what's the "etc" as part of major?
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post #18 of 18 Old 12-22-2012, 03:43 PM
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456

My car is a GT, not an M - it's a '95.

In terms of a major the etc is sparkplugs, fuel filters, pollen filter, accessory belts, cam box gaskets, cam o-rings, cam oil seals.

I do all my own work - I figure if I get in too deep I can always send it to a shop to get sorted. So far, no worries on that front, and I get the plus of learning from it too...
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