londonsean69
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| posted on 18/12/08 at 09:18 AM |
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Calculating Spring Lengths
OK, calculating might be a bit too much, guesstimating is probably more like it
When I look at the RallyDesign site, I see there are piles of different dampers available, in a whole multitude of lengths.
How do people work out the spring length required?
I am looking at using 14" open 9.5" closed shocks on a Haynes Roadster (car engined), but have no idea on how to even guess at what length
spring to use.
What have other people used?
Cheers
Sean
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Mr Whippy
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| posted on 18/12/08 at 09:23 AM |
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Personally I'd just buy some that are about 10mm longer than the open length and change the coil diameter and pitch to suite the weight. That
way fitting them will not possably require a hospital visit.
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mr henderson
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| posted on 18/12/08 at 09:54 AM |
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This subject has been done to death on this forum, have a look through any of the posts to do with springs, and you will find more info on the subject
than you can wave a panhard rod at.
Bear in mind that springs have TWO parameters that concern you. Length and rate. They cannot be considered independently.
Look for Mike Capon's spring rate spreadsheet, you can use it to work out what length you need as well. I'd post a link too it if I knew
how to
John
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MikeCapon
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| posted on 18/12/08 at 10:26 AM |
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Here it is.... Have a go at filling this in and come back to me if you can't see the answer.
Stuff to consider when choosing spring lengths,
1 When you have added enough preload to get the right ride height will the spring fit on the shock?
2 When the shock is fully closed (full bump) is there enough travel in the spring to avoid the coils touching each other (coil bound) which can
easily do a lot of damage. Any half decent spring supplier will be able to tell you the travel or solid height for any given spring.
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