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[Datsun 1200 encyclopedia]

Coilovers

(Difference between revisions)

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Category: Suspension Modifications
Revision as of 05:31, 29 March 2009
ddgonzal (Talk | contribs)
(->Weld)
<- Previous diff		 Revision as of 07:34, 23 January 2012
ddgonzal (Talk | contribs)

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** more room for tires, or wider tires ** more room for tires, or wider tires
-[[Parts Sources|Ground Control]] has fully adjustable [[Coilovers]] struts, for $199 USD a pair. +You can either buy thread collars for the lower spring seat, OR use a simple seat stop (non-threaded). The latter is adjustable if you use a commercial-grade shaft clamp (see [[fastening spring seats]]).
-[http://datsun1200.com/modules/myalbum/photo.php?lid=9194 http://datsun1200.com/modules/myalbum/photos/thumbs/9194.jpg] Coilover kit from Ground Control+= Coilover Kits =
 +[[Parts Sources|Ground Control]] has fully adjustable [[Coilovers]] kits for the Datsun 1200 and other models, for $199 USD a pair.
 + 
 +NOTE that the kit does not include the struts themselves, just the spring seats & coils.
 + 
 +[http://datsun1200.com/modules/myalbum/photo.php?lid=9194 http://datsun1200.com/modules/myalbum/photos/thumbs/9194.jpg] Coilover kit from Ground Control on Datsun struts
Discussion: [http://datsun1200.com/modules/newbb/viewtopic.php?topic_id=20569&forum=1 stiffer suspension] Discussion: [http://datsun1200.com/modules/newbb/viewtopic.php?topic_id=20569&forum=1 stiffer suspension]
 +[http://www.paradiseracing.com/SCcoiloverkits.htm Paradise Racing] has front coilovers for Datsun 1200: Part Number DATF $175. Their softest spring rate (250 pounds) is suitable for racing.
-Or, you can modify Nissan struts to accept standard 2-1/4 inch coils+= Non-Kits =
 +Instead of buying a kit, you can modify Datsun struts to accept standard 2-1/4 inch coils. You can buy the springs and spring seats separately.
-[http://datsun1200.com/modules/myalbum/photo.php?lid=10666 http://datsun1200.com/modules/myalbum/photos/thumbs/10666.jpg] +[http://datsun1200.com/modules/myalbum/photo.php?lid=10666 http://ddgonzal.members.winisp.net/getThumb.aspx?width=240&uri=http://datsun1200.com/modules/myalbum/photos/10666.jpg]
= Front = = Front =
Line 31: Line 38:
The better coilovers actually have the thread for the top cap on the inside of the threaded sleeves. This way you just have to cut the strut to the length you want and then weld the threaded sleeves on and the cap screws into the top of the sleeve. They also have a turned step on the inside of them where the threaded sleeve rests on the top of the strut body. This way no load is supported simply by a weld. The better coilovers actually have the thread for the top cap on the inside of the threaded sleeves. This way you just have to cut the strut to the length you want and then weld the threaded sleeves on and the cap screws into the top of the sleeve. They also have a turned step on the inside of them where the threaded sleeve rests on the top of the strut body. This way no load is supported simply by a weld.
- 
- 
Remember that the stock spring rate is 91 pounds/inch, so 250 pound springs will result in a very stiff ride, suitable for track racing with a lowered car. Not recommended for bumpy surfaces such as public streets or off-pavement racing. For street use, consider 175 pounds the upper limit. Remember that the stock spring rate is 91 pounds/inch, so 250 pound springs will result in a very stiff ride, suitable for track racing with a lowered car. Not recommended for bumpy surfaces such as public streets or off-pavement racing. For street use, consider 175 pounds the upper limit.
- 
- 
-[[Parts Sources|Ground Control]] has fully adjustable coilover struts, for $199 USD a pair. See [http://datsun1200.com/modules/newbb/viewtopic.php?topic_id=20569&forum=1 stiffer suspension] 
-* [http://datsun1200.com/modules/myalbum/photo.php?lid=9194 http://datsun1200.com/modules/myalbum/photos/thumbs/9194.jpg] Coilover kit from Ground Control 
- 
- 
-[http://www.paradiseracing.com/SCcoiloverkits.htm Paradise Racing] has front coilovers for Datsun 1200: Part Number DATF $175. Their softest spring rate (250 pounds) is suitable for racing.  
- 
= Rear = = Rear =
-Coilovers can be easily fitted to the rear of sedans, and less easily to coupes). Some modifications to the shock tower are needed.+Coilovers can be easily fitted to the rear of sedans (and less easily to coupes). Some modifications to the shock tower are needed.
One idea is to remove all the leaf springs except the main leaf. The main leaf is left to control placement of the axle housing. The coilovers handle most of the weight of the rear suspension. One idea is to remove all the leaf springs except the main leaf. The main leaf is left to control placement of the axle housing. The coilovers handle most of the weight of the rear suspension.
Line 54: Line 51:
= Spring Seats = = Spring Seats =
-You can buy the spring seats separately from the springs. Since most 'kit's are only available in high spring-rate (stiff) springs, not suitable for streets 1200s, this give you the flexibility to mix and match.+You can buy the spring seats separately from the springs. Since most "kits" are only available in high spring-rate (stiff) springs, not suitable for streets 1200s, this give you the flexibility to mix and match.
- +
-== Stock 1200 Spring Seat ==+
-If using stock 1200 springs, just reuse the stock spring seat. You can carefully grind the welds off the strut housing, and presto! you have a movable spring seat. Move it to a new position and fasten securely.+
== Threaded Seats == == Threaded Seats ==
Line 75: Line 69:
reference: [http://datsun1200.com/modules/newbb/viewtopic.php?topic_id=29750&forum=1 removable spring seat] reference: [http://datsun1200.com/modules/newbb/viewtopic.php?topic_id=29750&forum=1 removable spring seat]
-= Seat Fitting =+= Fastening the Spring Seat =
-Traditionally, spring seats are welded to the strut body. +Traditionally, spring seats are welded to the strut body. Or, some Datsun fans use a Shaft Collar instead of welding the bottom perch. Both methods allow adjustment on-car after installation.
- +
-NOTE: Unit coilovers (not Strut type), as might be used on the rear suspension of a 1200, often have an integral flange and the seat just is tapped on until it bottoms.+
- +
-== Weld ==+
-Welding the spring seat to the strut body is the generally accepting fitting method. Options include:+
-* Seat welded directly to strut body. This is how the factory did it+
-* A seat stop is welded to the strut body+
-* Hybrid: a seat stop is welded to the seat, then that assembly welded to the strut body+
- +
-Notice the secure welds in this photo, at the bottom of the threaded sleeve:+
-<br>[http://datsun1200.com/modules/myalbum/photo.php?lid=1407 http://datsun1200.com/uploads/photos/thumbs/1407.jpg]+
- +
-== Strut Collars ==+
-Some Datsun fans use a Shaft Collar instead of welding the bottom perch. Works a treat, even some racers and a few commercial spring companies use this method.+
- +
-[http://datsun1200.com/modules/myalbum/photo.php?lid=10084 http://datsun1200.com/modules/myalbum/photos/thumbs/10084.jpg] Shaft Collar on S310 Strut+
-* Use a two-piece shaft collar+
-* Do *not* use a set-screw collar+
-* Get the kind with cap screws, not set screws. They are double the holding power+
- +
-# cut/grind the stock Datsun spring cup+
-# fit the clamp to the strut tube and tighten+
-#* When installing a split collar, it is important that a small gap remain between the two halves of the collar.+
-#* You must use a torque wrench for safe installation+
-# put the spring cup over the tube, it sits on top of the collar+
- +
-This is adjustable, like the more traditional threaded collars except instead of being welded, it is clamped to the strut tube. Use s single split Shaft Collar. Instead of threading the seat up/down, loosen and move the collar.+
- +
-[http://www.climaxmetal.com/2pc_metric_collar.htm http://www.climaxmetal.com/images/Products/M2C-S_170.jpg]+
- +
-45mm Collar (1.77 inch): For Datsun 1200 and 120Y+
-* 45mm bore+
-* 73mm O.D+
-* 19mm thick+
-* Weight Steel: 12.5 oz+
-* Price: [http://www.mcmaster.com/#9520t19/=17ctlo Aluminum: About $27 USD], [http://www.drillspot.com/products/463338/Ruland_Manufacturing_MSP-45-F_Shaft_Collar Steel: $23]+
- +
- +
-2" Collar (50.8 mm): For most Datsuns (including 280ZX and B310)+
-* 2" bore+
-* 3" O.D+
-* 11/16 inch thick. +
-* Weight Aluminum: 4.4 oz+
-* Weight Steel: 11.0 oz+
-* Price: [http://shop.ebay.com/items/?_nkw=split+shaft+collar+2%22&_sacat=0&_trksid=p3286.m270.l1313&_odkw=split+shaft+collar+2%22&_osacat=0 About $15 USD] for steel+
- +
-=== Counterpoint ===+
-Some people use a standard muffler clamp instead of a Shaft Collar. That sounds less secure than a Shaft Collar. They use two of the half-circle parts with straight bolts. This is basically a sheet-metal shaft collar.+
- +
-Are either of these methods safe? Some feel they are not. Others have run them in race cars for years with no problems.+
 + See main article: [[Fastening Spring Seats]]
[[Category:Suspension Modifications]] [[Category:Suspension Modifications]]

Revision as of 07:34, 23 January 2012

Coilover springs can be fitted to the Datsun 1200, replacing the front coils springs. In the rear they can supplement the leaf springs. One advantage of coilovers is that many spring rates are available for customizing.

Contents

Overview

With stock Datsun 1200 struts or upgraded struts, you have the option to convert them to coilover spring configuration. Advantages include:

  • Adjustable spring height, for lowering or for adjusting different length springs
  • Many spring rates are available for customizing
  • If using small-diameter springs, you gain
    • more room to move the strut inward for extra negative Camber
    • more room for tires, or wider tires

You can either buy thread collars for the lower spring seat, OR use a simple seat stop (non-threaded). The latter is adjustable if you use a commercial-grade shaft clamp (see fastening spring seats).

Coilover Kits

Ground Control has fully adjustable Coilovers kits for the Datsun 1200 and other models, for $199 USD a pair.

NOTE that the kit does not include the struts themselves, just the spring seats & coils.

9194.jpg Coilover kit from Ground Control on Datsun struts 

Discussion: stiffer suspension

Paradise Racing has front coilovers for Datsun 1200: Part Number DATF $175. Their softest spring rate (250 pounds) is suitable for racing.

Non-Kits

Instead of buying a kit, you can modify Datsun struts to accept standard 2-1/4 inch coils. You can buy the springs and spring seats separately.

10666.jpg

Front

An advantage of coilovers on the front is that they are small-diameter. This mean you can move the strut top further to gain addition negative camber.

  • Stock springs: 110mm (4.33 in)
  • Coilovers: 2 in

The Datsun 1200 strut housing is 45 mm diameter (many other Datsun are 50.8 mm).

Stock strut inserts have a 17mm stroke.

The better coilovers actually have the thread for the top cap on the inside of the threaded sleeves. This way you just have to cut the strut to the length you want and then weld the threaded sleeves on and the cap screws into the top of the sleeve. They also have a turned step on the inside of them where the threaded sleeve rests on the top of the strut body. This way no load is supported simply by a weld.

Remember that the stock spring rate is 91 pounds/inch, so 250 pound springs will result in a very stiff ride, suitable for track racing with a lowered car. Not recommended for bumpy surfaces such as public streets or off-pavement racing. For street use, consider 175 pounds the upper limit.

Rear

Coilovers can be easily fitted to the rear of sedans (and less easily to coupes). Some modifications to the shock tower are needed.

One idea is to remove all the leaf springs except the main leaf. The main leaf is left to control placement of the axle housing. The coilovers handle most of the weight of the rear suspension.

Paradise Racing has rear coilovers for Datsun 1200: Part Number DATNAR $349 for non-adjustable, and DATR $499 for 12-position (soft to firm) units. Their softest spring rate (250 pounds) is suitable for racing.

KONI sells 42mm Inside Diameter and 50mm I.D. threaded sleeves for coilover use. They use 2-1/4 inch (57mm) I.D. springs. KONI 80-series are 42mm O.D. shocks, while 30-, 82- and 87-series is 50mm O.D.

Spring Seats

You can buy the spring seats separately from the springs. Since most "kits" are only available in high spring-rate (stiff) springs, not suitable for streets 1200s, this give you the flexibility to mix and match.

Threaded Seats

A coilover 'kit' typically comes with a threaded tube and nut-type seat that can be screwed higher or lower. They typically come in 2-1/4 inch size for 2-1/4" springs.

You can buy these separately and use with your own spring choice.

BMW Spring Seats

Instead of buying new, 2" diameter expensive springs, re-use your existing ones by using BMW removable spring seats.

BMW sports option rear coilovers have a glued on lower spring seat that can be tapped off, the ID is the same size as the datsun OD so can be slid over the Datsun 1200 strut and welded on. They come in late 70s-80s 320i, probably in a lot of other BMW models too.

The BWM spring has a flat bottom, for use use the the BMW seat. However, the top of the spring is the same as the Datsun spring so it fits the 1200 top seat perfect. These BMW springs are around 200 lb/in, suitable for racing 1200s.

Do they work with the stock 1200 springs?

reference: removable spring seat

Fastening the Spring Seat

Traditionally, spring seats are welded to the strut body. Or, some Datsun fans use a Shaft Collar instead of welding the bottom perch. Both methods allow adjustment on-car after installation. 

See main article: Fastening Spring Seats

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