Re: [Chrysler300] 300C rear spring rate query

["George Riehl" <longrams@xxxxxxxxxxxxx>]

Christopher; According to the A.M.A. specs. for the 1957 300C,  spring rate for the 58"x2.5"x7 leaf spring, rate is 130# to 140# per inch. 195# without tires. Normal load (lb. at rated length) is 800# at the right and 840# at the left with tires.
New Yorkers, 58"x2.5"x6 leaves, spring rate is 85# - 95 # per inch. Rate at wheel is 135# without tires. Normal load is 680# on the right and 760# at the left. There are no other details about various spring deflection rates. There is no mention of different chassis weights, i.e., coupe versus heavier frame (X member) on the convertable.
  George Riehl




  ----- Original Message ----- 
  From: christopher beilby 
  To: Chrysler300@xxxxxxxxxxxxxxx 
  Sent: Tuesday, April 17, 2007 9:22 AM
  Subject: [Chrysler300] 300C rear spring rate query


  I know it has likely been given before, but what is the lbs per inch/foot? 
  rate for 1957 300C rear leaf springs - ie the amount of force required to 
  deflect the spring a certain amount.

  Earlier I asked if anyone had tried/experimented with stronger than stock 
  rear springs rather than fitting rear sway bars, and got no replies, and 
  since then have fitted stronger rear springs to my work horse 71 El Camino 
  with very positive (flatter cornering, not ride really though) results, and 
  so I am thinking even more so of trying getting stiffer rear springs for one 
  of my 300Cs, and so knowing what rate they were stock will help decide how 
  much stiffer to try for.

  Driving my first 300C today, and to beat heavy oncoming traffic, I floored 
  it from standing start for first time in a while, and was pleased/reminded, 
  how well a well tuned one gets up and goes - which was just as well as it 
  was only a 30 metre gap I jumped into, it rapidly closing off by a 40 mph 
  bus that was what I was cutting in in front of - that old 392 really got 
  into it, stood the C on it's tail as it got up to 40 mph. Then coming home 
  tonight, I shut down a local product V8 'hoon boys' favourite sedan, by 
  jumping him as soon as light turned green - the C's Torqueflight hole 
  shotting his modern GM slushmatic in first 30 feet, so he never really 
  bothered as 'game over' already. Any of you with those early hemi 300s, and 
  a well set up torqueflight, give them the odd 'bit of stick' every so often 
  - it should bring a smile to your face - and boy that could be a good thing 
  with much bad news/events round lately !!?

  take care, enjoy those 300s,

  Christopher in Oz where our dry weather/drought just gets worse if winter 
  break does not come soon as autumn deepens.

  ps after just doing a 3 day fast 'out of state; trip im my souped up 71 El 
  C, and then stepping straight into my 'old' 57 300C - even with not so firm 
  rear springs, my C can be driven harder in a slow 90 degree corner, buried 
  into it with brakes, pull wheel hard around, then plant it coming out, and 
  suburban (slow traffic down) roundabouts are also surer in the old C than 
  the more agile 71 El C, and those old 69-72 El Caminos are no barge, poor 
  handler, re good feeling steering, disc brakes, and punch out of corners if 
  motors slightly worked over. Only '300C' negative, the body is not as 
  flex/squeak free.

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