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> How much do your door gaps change when you jack up the car?
siverson
post Oct 15 2011, 09:29 AM
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I'm trying to figure out what's "right"... How much do your door gaps change when you jack up the car in the middle? Assuming an otherwise normal, non-rusty car.

Mine get *a little* tighter on the bottom and widen at the top - is that normal?

- None?
- Not measureable?
- 1mm?
- 2mm?
- More? A lot?

-Steve
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matthepcat
post Oct 15 2011, 09:48 AM
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Mine is not measurable but I have a chassis kit, welded cockpit seams and firewall to rear strut tower bracing.
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Andyrew
post Oct 15 2011, 10:25 AM
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Same, none, but I have the long stiffening kit and a solid car.
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tradisrad
post Oct 15 2011, 11:05 AM
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no visible change, no chassis mods.
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Drums66
post Oct 15 2011, 11:11 AM
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.....I like to admit this, solid car with no negative change!
someone else get's the benefit (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/smile.gif)
(IMG:style_emoticons/default/bye1.gif) (IMG:style_emoticons/default/flag.gif)
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siverson
post Oct 15 2011, 11:48 AM
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I wonder if the 3.6 and 915 (both heavy) are part of my problem...
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sfrenck
post Oct 15 2011, 11:51 AM
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Too much... two Brad Mayeur stiffeners in my near future.
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Drums66
post Oct 15 2011, 11:58 AM
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.....When going against initial engineering...I would think there would have to
be compensation in certain areas?? (IMG:style_emoticons/default/idea.gif)
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sean_v8_914
post Oct 15 2011, 12:42 PM
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I think you must define the jacking point
are you talking about at the rear doughnut? your car is normal.
those of you that say no change are:
a. full of it
b. in denial
c. unobservant
d. all of the above
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Tom_T
post Oct 15 2011, 12:42 PM
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QUOTE(siverson @ Oct 15 2011, 10:48 AM) *

I wonder if the 3.6 and 915 (both heavy) are part of my problem...


The 915 isn't much heavier than a 901, and the 914 was designed to take up to the 2.7 -6 at least - had they not stopped production of the 914-6 in 72, since it was slated to get the next-last generation 911 motor as the 911 upgraded over time.

So the slightly heavier 3.6 shouldn't change the flex at the longs significantly I wouldn't think, unless there's something else going on.

Normal good longs/unibody should give about nil. You need to check for corrision issues IMHO.
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computers4kids
post Oct 15 2011, 01:01 PM
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no change, v8
No extra stiffening
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stugray
post Oct 15 2011, 01:14 PM
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"those of you that say no change are:"
....
or E - have a rollcage.

not only did I see no change, but the car balances on three jackstands.
The fourth jackstand is loose.

That is how stiff these cars should be.

Stu
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siverson
post Oct 15 2011, 05:16 PM
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Thanks. Interesting conflicting opinions here...

> are you talking about at the rear doughnut?

Yes.

-Steve
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VaccaRabite
post Oct 15 2011, 09:28 PM
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If there is enough deflection that you can notice it, there is a problem.

Maybe not if you have a v8 for an engine, or a big 6. But for a subi or a T4 there should not be much if any deflection.

Zach
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Mike Bellis
post Oct 15 2011, 10:30 PM
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This is normal right??? (IMG:style_emoticons/default/barf.gif)

Attached Image

Attached Image


This car is cut up to be reborn as a 914 trailer... (IMG:style_emoticons/default/biggrin.gif)
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John
post Oct 16 2011, 01:09 AM
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Mine does not move any longer. I made my own LONG stiffeners before I ever heard of anyone else offering these for sale. Must have been 20+ years ago....

The track car does not move, but it is stiffened and a roll cage.

The future track car does not move, but it is a stripped tub.
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Andyrew
post Oct 16 2011, 09:42 AM
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QUOTE(sean_v8_914 @ Oct 15 2011, 11:42 AM) *

I think you must define the jacking point
are you talking about at the rear doughnut? your car is normal.
those of you that say no change are:
a. full of it
b. in denial
c. unobservant
d. all of the above


Read stiffening kits?

I remember seeing some unmeasurable amount of flex when I jacked the car up years ago. But with my v8 in the back and the stiffening kit, the chassis is rock solid.
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sean_v8_914
post Oct 16 2011, 10:47 AM
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throwing modified cars into the study group dilutes the real answer i think. the question was about a STOCK chassis, right?

every bone stock 914 will flex when lifted at the rear doughnut. this is not an opinion. this is an observation from a guy that deals with these cars almost every day. some flex more, some less. some flex due to rust. some due to chassis fatigue. some have spot welds that give up along the seams. some were driven by grandma while some wore slicks for 10 years.....
all this affects how loose the chassis has become

if you think that your stock 914 chassis does not flex then you are an optimistic person and I like upbeat positive people
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somd914
post Oct 16 2011, 11:48 AM
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Can't say that I have ever measured it, don't think an eyeball and a casual glance would notice a 1-2 mm change. Do know there is no change that jumps out at me and both doors open/close the same when on a single stand, multiple stands, or on the ground. But does this mean the chasis isn't flexing? I wouldn't draw that conclusion. And yes, I typically use the donuts, oh, stock 2.0 setup.

QUOTE(siverson @ Oct 15 2011, 11:29 AM) *

I'm trying to figure out what's "right"... How much do your door gaps change when you jack up the car in the middle? Assuming an otherwise normal, non-rusty car.

Mine get *a little* tighter on the bottom and widen at the top - is that normal?

- None?
- Not measureable?
- 1mm?
- 2mm?
- More? A lot?

-Steve
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stewteral
post Oct 16 2011, 11:55 AM
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QUOTE(sean_v8_914 @ Oct 15 2011, 11:42 AM) *

I think you must define the jacking point
are you talking about at the rear doughnut? your car is normal.
those of you that say no change are:
a. full of it
b. in denial
c. unobservant
d. all of the above


sean_v8_914,

LOL!! You sure hit the nail on the head.

For my car there is 0 change thanks to my full rollcage that ties in all the suspension towers.

I now know why my 1st 914 (30 years ago) always had a squeaky roof: the chassis was flexing over bumps in the road!

Best,
Terry
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