Jump to content

510 rear suspension


obrut

Recommended Posts

I have my complete rear cross member and suspension out of my 72 510.  I'm going to use stock Nissan control arm bushings but can't seem to find the mustache bar bushings, cross member mounting bushing, spring isolators and bump stops.  The only ones that I can find are poly, how bad are these on the street?  I'm building a street car that I'll use for autox too.

 

Just pressure washed it yesterday, bushing don't look bad, there just old.

rear susp.jpg

Edited by obrut
add pic
Link to comment
  • Replies 19
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

If the poly bushing are sleeved, there shouldn't be any issues at all. And since the mustache bar and crossmember don't rotate, like a control arm, there shouldn't be any squeaking, which is common with poly bushings.

 

We used to machine solid aluminum bushings for the mustache bar and crossmember. The solid mounting of those allowed the suspension to do its job and made the handling more consistent.

Link to comment

Yep, no luck finding anything in rubber.

 

I checked and Whiteline sells crossmember and mustache bushing and they do have the sleeves.  I also looked at what ermish sells and they don't seem to have them.  I also found poly coil spring isolators on ebay.  No luck on bump stops, maybe there is a universal one that will work.

Edited by obrut
  • Like 1
Link to comment
1 hour ago, Stoffregen Motorsports said:

We used to machine solid aluminum bushings for the mustache bar and crossmember. The solid mounting of those allowed the suspension to do its job and made the handling more consistent.

Ermish Racing has solid bushings (I didn't see anything about what material it is):

https://ermish-racing.com/product/207558

https://ermish-racing.com/product/207560

And Polyurethane bushings:

https://ermish-racing.com/product/207512

https://ermish-racing.com/product/207515

  • Like 1
Link to comment

If I recall, you can use a generic Daystar brand snubber style bumpstop inside the lower control arm. OEM Toyota pickups used something very similar, but a lot more stout. I probably have a dozen laying around.

 

The neat thing about the Daystar bumps is that you can trim them to your requirements. Well, I suppose you could trim any old stops.

 

https://www.jegs.com/i/JEGS+Performance+Products/555/61860/10002/-1

  • Thanks 1
Link to comment

D50 are 6.5 coils and that one is 9. That sort of looks like an Hitachi symbol. Maybe Hitachi made the D50 springs? Three careful and accurate measurements on the springs and the spring constant can be worked out easily enough. The stockers would be around 370 lb/in. or near 100 at the axle. D50 are 500 lb/in or 130 felt at the axle. D50 are 6.5 coils and that one is 9 

  • Like 1
Link to comment
8 hours ago, datzenmike said:

D50 are 6.5 coils and that one is 9. That sort of looks like an Hitachi symbol. Maybe Hitachi made the D50 springs? Three careful and accurate measurements on the springs and the spring constant can be worked out easily enough. The stockers would be around 370 lb/in. or near 100 at the axle. D50 are 500 lb/in or 130 felt at the axle. D50 are 6.5 coils and that one is 9 

I will get those measurements and post them, length, width and coil diameter?

Link to comment

Thickness of the wire (around 0.5") diameter of coil outside to outside is fine, number of coils not touching each other. In this case it looks to be about 8.3? coils. Accuracy is important. Ticker wire is stiffer than thinner, a larger diameter error makes the spring 'softer' and a higher number of free coils makes the rate 'softer'. Just make as careful a measurement as possible.

 

N American 510 sedans should be around 11.8" tall though this doesn't really allow for age sagging. The wire diameter is 0.56" and the coil diameter is 3.543". Probably center to center, just measure the outside and subtract one wire diameter to get center to center. Stock spring rate is around 98 pounds per inch (lb./in.) 

Link to comment

Thanks Mike, I will measure when I get home tonight.

 

Matt those look like the ones the ermish sell.  They don't seem to have the solid sleeve in the middle, unless its just not pictured.

 

  • Like 1
Link to comment
3 hours ago, obrut said:

Wire diameter 0.560"

Coils not touching  9

Overall height 11.75"

 

 

Need coil outside to outside diameter. Probably around 4"???

 

Starting to look like stock 510 rear springs.

Link to comment

Yes 4" outside diameter.  I was searching and found a old post that's said something about red stripe was stock rear and yellow stripe stock front?  Not sure on that and I can't find any other markings on them.

Link to comment

Rear coils are way stiffer than the front coils. The rear control arm acts like a cantilever. The spring is not over the axle but way in front of it. To 'feel' 100 pounds on the axle the spring has to be 380 pounds per inch spring rate, or 3.8 times

 

 

4" - 0.56" = 3.44" center to center. That works out to 377.48 lb/in. When divided by 3.8 your get 99.33 lb/in. I think I said it's about 98 so close enough. It's confirmed to be stock rear springs.

 

The formula for coil spring rate calculation is 11,250,000 (steel constant) X wire diameter4 / 8 X number of non touching coils X coil diameter center to center 3 

  • Like 2
Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.