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Need coil spring/ride height help
#11
I believe the 550 pound springs would put you in the same situation the Laurel Mountain springs did, a ride like a buckboard.

The 450 pound springs should be plenty stiff, I wouldn't go less than 400s.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#12
mbrew2,

I have used the Scott Drake 1" lowering springs on both my 73 Mach 1 and my 72 convertible. Both have factory competition suspension and are all stock in the engine compartment including original A/C. The rear springs on both cars are the correct Eaton factory springs. Both cars have factory rims and tire sizes. The 72 has the exact size tires as on your car and my front ground to fender lip is 25 3/8". The 73 sits a bit lower but that is because it has the factory 14" rims and the 72 has the factory 15" rims.

As others have said, I highly doubt these are 600 lb springs. My cars both have a nice ride and I would not say it is stiff or harsh at all. Both cars also have KYB GR all the way around. I was looking for a slight rake front to back and this produced the desired result on both cars.

I would try switching out the shocks first and see if that works. Good luck!


[Image: IMG-4309a.jpg]


[Image: IMG-4104.jpg]

Jeff
1972 Q Code Convertible
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#13
Do you still have your Drake springs? I'd love to get the dimensions on them to calculate the actual spring rate. Lots of people seem to have issues with the springs from them, probably too much of the "fits all" mentality.


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#14
He actually changed out the Scott Drake springs for some more appropriate springs from Eaton, and is much happier.  Wink

Unfortunately, changing out shocks won't do anything to change the ride height - probably won't have much effect on the actual ride itself either, depending on how stiff the springs are.

Eric

[Image: mach1sig2.gif]
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#15
(01-26-2019, 01:13 PM)Hemikiller Wrote: Do you still have your Drake springs? I'd love to get the dimensions on them to calculate the actual spring rate. Lots of people seem to have issues with the springs from them, probably too much of the "fits all" mentality.

I do. If you can guide me on what to measure I will do the best I can to get you the information. I'm curious too.
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#16
First, measure the 'wire' diameter as accurately as you can, as this is a critical measurement and paint thickness can make a difference. It's preferable to use a dial caliper or micrometer if you have one available.

Then measure the ID and/or OD of the coils parallel to the top of the spring that seats in the shock tower. Again as accurately as you can. These are not such critical measurements as the wire diameter, but if you let me have both they will provide a cross check for the wire diameter measurement given above.

Next, I need the free length, or overall length of the spring.

Finally, count the number of 'active' coils. Do not count the ground portion of the spring, start where it is touches the next coil.


I've often thought that companies screw up the calculations because Ford's spring-on-upper-arm suspension essentially removes half a coil from the "active coils" in the calculations.


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#17
(01-26-2019, 03:42 PM)Hemikiller Wrote: First, measure the 'wire' diameter as accurately as you can, as this is a critical measurement and paint thickness can make a difference. It's preferable to use a dial caliper or micrometer if you have one available.

Then measure the ID and/or OD of the coils parallel to the top of the spring that seats in the shock tower. Again as accurately as you can. These are not such critical measurements as the wire diameter, but if you let me have both they will provide a cross check for the wire diameter measurement given above.

Next, I need the free length, or overall length of the spring.

Finally, count the number of 'active' coils. Do not count the ground portion of the spring, start where it is touches the next coil.


I've often thought that companies screw up the calculations because Ford's spring-on-upper-arm suspension essentially removes half a coil from the "active coils" in the calculations.
OK, here's what I have so far: wire diameter measured in several different coils = .71 to .715, free height = 13 3/8",  # of coils = 8
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#18
(01-26-2019, 04:58 PM)mbrew2 Wrote:
(01-26-2019, 03:42 PM)Hemikiller Wrote: First, measure the 'wire' diameter as accurately as you can, as this is a critical measurement and paint thickness can make a difference. It's preferable to use a dial caliper or micrometer if you have one available.

Then measure the ID and/or OD of the coils parallel to the top of the spring that seats in the shock tower. Again as accurately as you can. These are not such critical measurements as the wire diameter, but if you let me have both they will provide a cross check for the wire diameter measurement given above.

Next, I need the free length, or overall length of the spring.

Finally, count the number of 'active' coils. Do not count the ground portion of the spring, start where it is touches the next coil.


I've often thought that companies screw up the calculations because Ford's spring-on-upper-arm suspension essentially removes half a coil from the "active coils" in the calculations.
OK, here's what I have so far: wire diameter measured in several different coils = .71 to .715, free height = 13 3/8",  # of coils = 8
If any of these measurements look odd to you, let me know and I'll try again. Old eyes don't see as well as they used to. I stared coil count at the end of the approx. 1/2 coil at the bottom of the spring to where it lined up with the next coil and so on. When I got to the flatter, top of the spring it worked out that there was close to the same distance between the last coil and the top so I counted it as a coil too. If it helps, space between coils is apprx .88
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#19
Wow - .715" wire diameter, no wonder the springs were so stiff. Can you also give me the OD of the spring itself?


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#20
(01-27-2019, 08:58 AM)Hemikiller Wrote: Wow - .715" wire diameter, no wonder the springs were so stiff. Can you also give me the OD of the spring itself?

OD is approximately 5 3/8 inches. I wouldn't use the .715 number, I checked again this morning and never got that reading again, Old eyes and maybe wasn't holding caliper square. Going this morning to buy a digital caliber to double check and see it I can read it any better!  If anything jumps up significantly different I'll let you know. Anyway, any wire over .70 explains a lot doesn't it.
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