Jump to content
Email-only Log-Ins Coming in December ×

IGNORED

Wheelbase predicament


Recommended Posts

Ok, so I went and measured the car in the shop. The pinch welds on the bottom of the rocker panels appear to be parallel. It's a little hard to measure the front because the floor supports interfere with a straight measurement. The rear was easy and measures out at 51 1/4". The under floor pan frame rails are close to 30" outside to outside but get a little wider near the front of the floor board. I wonder if that is because there are more layers of metal there.

For center line in the rear there seems to be a list of good candidates. Center of mustache bar bolts, center of control arm bolts, etc. All of these seem to be centered off of the wheel wells.

The front is more difficult. I agree that everything forward of the firewall is suspect. I ended up concluding that the center of the hood latch bracket is a good candidate for a center line. It seems to measure very close to center from the top of the fender supports. If the hood latch is not centered anymore then you probably have bigger problems. Not much else there to work with...

  • Like 1
Link to comment
Share on other sites


Charles:

Would you mind also measuring between the centre of the front shock towers, if convenient?  FSM says 913mm. 

Interesting that your measurement of the pinchweld separation distance (51.25" = 1302mm) is smaller, rather than larger, than the 1326mm value I got from scaling off a screen blow-up the FSM diagram.  The difference is almost exactly 1.0"...  which makes me suspicious.

 

Edited by Namerow
comment added about FSM vs. actual dimensions
Link to comment
Share on other sites

  On 5/26/2018 at 1:45 AM, Namerow said:

Charles:

Would you mind also measuring between the centre of the front shock towers, if convenient?  FSM says 913mm. 

Interesting that your measurement of the pinchweld separation distance (51.25" = 1302mm) is smaller, rather than larger, than the 1326mm value I got from scaling off a screen blow-up the FSM diagram.  The difference is almost exactly 1.0"...  which makes me suspicious.

 

Expand  

Yes I will try to get a center to center on the front shock towers.

I measured inside to inside on the pinch welds. I will get an outside to outside and see if that is more in spec. It would make sense they would work on outside dimensions and leave the error for the inside. There are a number of metal layers there so the flange is fairly thick

Link to comment
Share on other sites

Outside seam to outside seam is 51 9/16" or 1310mm

Center to center on the front shock towers is 35 7/16" or 900 mm

It looks like the FSM has 913 for this dimension. Will be interesting to see if my hood and fenders fit correctly when I set it off the rotisserie??? That's a pretty big "bust"!

 

Edited by Patcon
Link to comment
Share on other sites

I did a hi-res scan of the FSM chassis drawing and then did a raster to vector conversion.  For those who are interested, I am attaching the cad file (.dwg format) that most cad software should open, as well the same drawing as a pdf.  I scaled the .dwg file as close as I could to 1:1. One thing I noticed was that when I scaled such that the horizontal dimensions were accurate the vertical dimensions were plus about 3%. See the dims in green that I added for reference.

Mike

 

 

240Z Chassis Dimensions - Source 1972 FSM Dated 10SEP71_Scaled_26MAY2018.pdf

240Z Chassis Dimensions - Source 1972 FSM Dated 10SEP71_Scaled_26MAY2018.dwg

  • Like 1
Link to comment
Share on other sites

  On 5/26/2018 at 4:59 PM, Patcon said:
Outside seam to outside seam is 51 9/16" or 1310mm
Center to center on the front shock towers is 35 7/16" or 900 mm
It looks like the FSM has 913 for this dimension. Will be interesting to see if my hood and fenders fit correctly when I set it off the rotisserie??? That's a pretty big "bust"!
 
My buddys car has the same 900mm as does mine and his hood fits beautiful. I would not sweat it LOL. IMG_20180506_171152_040.jpeg

Sent from my SM-N950W using Tapatalk

  • Like 1
Link to comment
Share on other sites

Definitely nice knowing I have a dead to nuts center line. Tomorrow I'm going to triple check the car is level them plumb some points down and ensure everything up front is square at least within reason. Once I fi ish the driver side frame rail and tie a bit more in on the floors, the structure will be done and then the next step is replacement panels for the rockers and rear lips. I also need from fenders, always prowl g Craigslist so if you guys see a decent factory set of steel fender s let me know!

What's everyones take on fiberglass fenders? Stay away or what

Sent from my SM-N950W using Tapatalk

  • Like 1
Link to comment
Share on other sites

  On 5/27/2018 at 4:33 PM, Elliott000 said:

Definitely nice knowing I have a dead to nuts center line. Tomorrow I'm going to triple check the car is level them plumb some points down and ensure everything up front is square at least within reason. Once I fi ish the driver side frame rail and tie a bit more in on the floors, the structure will be done and then the next step is replacement panels for the rockers and rear lips. I also need from fenders, always prowl g Craigslist so if you guys see a decent factory set of steel fender s let me know!

What's everyones take on fiberglass fenders? Stay away or what

Sent from my SM-N950W using Tapatalk
 

Expand  

Depending on what you need for rockers. There is a member on here that makes some of the parts that are NLA.

@disepyon

you aught to read his build thread

  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Who's Online   1 Member, 0 Anonymous, 613 Guests (See full list)

×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.