jefe de jefes Posted October 18, 2010 Report Share Posted October 18, 2010 Bumptsteer spacer bolt info required? Anybody know what length/thread pitch is needed for a 1 inch spacer? These are going to be used with 280zx struts. Quote Link to comment
Docsis510 Posted October 18, 2010 Report Share Posted October 18, 2010 I have a set. Ill check tomorrow and let you know the details Quote Link to comment
Pacific coast Datsun Posted October 18, 2010 Report Share Posted October 18, 2010 ""Bumptsteer spacer bolt info required? Anybody know what length/thread pitch is needed for a 1 inch spacer? These are going to be used with 280zx struts"" Jefe. I went with a grade 8 allen bolt for my bump steer spacers. Im running the same struts as you. I believe they are 2 inches long. I can dbl. check for you tomorrow if need be. Quote Link to comment
jefe de jefes Posted October 18, 2010 Author Report Share Posted October 18, 2010 Cool, keep me posted guys. All I need is these bolts and longer studs to complete my strut swap. Thanks Quote Link to comment
datzenmike Posted October 18, 2010 Report Share Posted October 18, 2010 Are the spacers just that, a spacer, or are they wedge shaped too? for camber?? Quote Link to comment
thisismatt Posted October 18, 2010 Report Share Posted October 18, 2010 Ideally you should get a class 10.9 bolt (Grade 8 is a reference to standard bolts, not metric. Metric 8.8 is more like Grade 5, 10.9 is more like Grade 8). You should get a measurement and get a bolt with a smooth shaft up through the spacer and only threads going into the strut. I want to say the bolt is a 10x1.25 but I can't remember for sure. Quote Link to comment
jefe de jefes Posted October 18, 2010 Author Report Share Posted October 18, 2010 Are the spacers just that, a spacer, or are they wedge shaped too? for camber?? Just a spacer I guess. Mine aren't wedge shaped. Quote Link to comment
dennis Posted October 18, 2010 Report Share Posted October 18, 2010 The smooth area between the head and the threads is called grip length. If you can wait a few days till my new set comes in I can run my caliper across it and let you know the size, grip length, and thread pitch along with any head markings. Quote Link to comment
jefe de jefes Posted October 18, 2010 Author Report Share Posted October 18, 2010 The smooth area between the head and the threads is called grip length. If you can wait a few days till my new set comes in I can run my caliper across it and let you know the size, grip length, and thread pitch along with any head markings. Perfect. I plan on installing maybe this coming weekend. Quote Link to comment
Pacific coast Datsun Posted October 19, 2010 Report Share Posted October 19, 2010 Are the spacers just that, a spacer, or are they wedge shaped too? for camber?? They are mainly used to correct the suspension geometry... Quote Link to comment
thisismatt Posted October 19, 2010 Report Share Posted October 19, 2010 The smooth area between the head and the threads is called grip length. If you can wait a few days till my new set comes in I can run my caliper across it and let you know the size, grip length, and thread pitch along with any head markings. * nods * Couldn't think of the name (I know it's not a shoulder like a lot of people like to call it). Quote Link to comment
dennis Posted October 19, 2010 Report Share Posted October 19, 2010 * nods * Couldn't think of the name (I know it's not a shoulder like a lot of people like to call it). The only reason why I know it was because I was a aircraft metal fabricator in the Navy and it was drilled into my head over and over again when I was in school. Quote Link to comment
RadioLobo Posted October 19, 2010 Report Share Posted October 19, 2010 Can you drill out the middle? My ball joint hits it when i try to bolt it together with the strut, maybe something else wrong? Quote Link to comment
Dime Dave Posted October 19, 2010 Report Share Posted October 19, 2010 Boy, I have no idea how these things got named "Bump Steer Spacers". To adjust bump steer you need to change the spatial relationship of the inner and outer tie rod ends to the lower control arm's pivot and ball joint locations. This is all left unchanged when you use these spacers. What they will do is put the tie rod/LCA in a closer to stock position where bump steer is likely less dramatic, but they do not alter the bump steer amount that is inherent in a suspension’s design. What these spacers do is change the location of the spindle to the ball joint. What this does is change the camber gain on the front suspension. In stock design the ball joint is lower than the inner pivot point. When the strut is loaded in a turn, it compresses and gains negative camber. This was done to help keep the tire squarer to the ground in corners. The negative camber gain in the suspension counteracts the positive camber gain from body roll. When you lower a strut suspension car, the ball joint often becomes higher that the inner pivot. In this condition, the strut actually gains positive camber when compressed. This increases the angle of the tire to the ground in cornering and adds to the angle caused by the body lean compounding it and greatly reduces the car’s cornering capacity. So these spacers are important to maintain negative camber gain on lowered cars for better cornering and are at best a band-aid to correct the bump steer issues that exist. Does anyone remember the “How to Hot Rod your Datsun” book. In the 2.5 TransAm build they raised the inner LCA pivot and bent the outer ends of the steering arms downward. The raised inner pivot point not only helped camber gain, but also removed bump steer. The lowered tie rod end on the steering arm was done to reduce bump steer as well. The severity of these changes give you an idea of how off the bump steer is on a stock 510 suspension. Quote Link to comment
jefe de jefes Posted October 19, 2010 Author Report Share Posted October 19, 2010 "Boy, I have no idea how these things got named "Bump Steer Spacers". Roll center adjusters? Everybody here calls them bumpsteer spacers...... Quote Link to comment
RoadRace Posted October 19, 2010 Report Share Posted October 19, 2010 12 x 1.25 x 55mm. i had a very hard time getting this capscrew in a 10.9 rating, in fact i had to buy 400 of them if i wanted them because they were special order. i regret to say i was not prepared to spend close to $1/bolt just for 4 of them. i went with standard 8.8 (from Aklands Supply, ~$18 for 10) and i check them every race and replace as necessary. do yourself a favor and get the tap to clean the threads out as well. Quote Link to comment
RoadRace Posted October 19, 2010 Report Share Posted October 19, 2010 Does anyone remember the “How to Hot Rod your Datsun” book. In the 2.5 TransAm build they raised the inner LCA pivot and bent the outer ends of the steering arms downward. The raised inner pivot point not only helped camber gain, but also removed bump steer. The lowered tie rod end on the steering arm was done to reduce bump steer as well. The severity of these changes give you an idea of how off the bump steer is on a stock 510 suspension. i like the datsport kit that addresses these issues. But at what point do you stop calling it a 'band-aid'? Quote Link to comment
jefe de jefes Posted October 19, 2010 Author Report Share Posted October 19, 2010 12 x 1.25 x 55mm. i had a very hard time getting this capscrew in a 10.9 rating, in fact i had to buy 400 of them if i wanted them because they were special order. i regret to say i was not prepared to spend close to $1/bolt just for 4 of them. i went with standard 8.8 (from Aklands Supply, ~$18 for 10) and i check them every race and replace as necessary. do yourself a favor and get the tap to clean the threads out as well. Thanks for the info. Got any extras you might be willing to sell? Quote Link to comment
Pacific coast Datsun Posted October 20, 2010 Report Share Posted October 20, 2010 Good info DimeDave. Another reason to run these would be guys who have done the 280 ZX strut swap & discover the caliper very close to the tie rod ends. The spacers push the strut down & away from the tie rod ends. Quote Link to comment
RoadRace Posted October 20, 2010 Report Share Posted October 20, 2010 Thanks for the info. Got any extras you might be willing to sell? maybe - i'll take a look tonight. i should have checked back here sooner!! Quote Link to comment
thisismatt Posted October 21, 2010 Report Share Posted October 21, 2010 There are places that will sell smaller quantities of 10.9 bolts. Metricmcc.com comes to mind, but it's been a while since I ordered from them. The minimum was 10 when I bought from them for my spacer bolts (mine were longer, though, using 1.5" spacers). Quote Link to comment
dennis Posted October 21, 2010 Report Share Posted October 21, 2010 mcmaster-carr (mcmaster.com) has them. Quote Link to comment
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