| Author | Message | ||
     ross kowalski Prolific User Username: cdfpw Post Number: 1285 Registered: 11-2015 |
I need to get some rear springs for SRH 8844. My rear rams are at 100% to keep it level. Here's what I will be researching. coil diameter = ? wire diameter = ? uncompressed height = ? number of coils = ? | ||
| Larry Kavanagh Frequent User Username: shadow_11 Post Number: 528 Registered: 05-2016 |
Hi Ross, Another thig to bear in mind with rear springs is that on some models each side has a slightly different length, this is to compensate for the weight of the fuel in the tank and the weight of the driver. I don't know if this applies to your model but probably worth checking. | ||
| Geoff Wootton Grand Master Username: dounraey Post Number: 2164 Registered: 05-2012 |
Hi Ross I'm currently running with the following spring dimensions: coil diameter = 155mm OD wire diameter = 17.5mm uncompressed height = 21 5/8" number of coils = 11 There is more info in the following thread: http://au.rrforums.net/forum/messages/17001/16457.html?1438295588 | ||
| Geoff Wootton Grand Master Username: dounraey Post Number: 2165 Registered: 05-2012 |
I think next time I would go for 10 coils at 20 5/8" length, as specified by Richard in the thread I pointed to previously. The ones I fitted did seem slightly high at first but have settled down to the correct ride height. | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1287 Registered: 11-2015 |
Geoff, Thanks, Just out of curiousity, how's the ride with those springs? | ||
| Robert J. Sprauer Frequent User Username: wraithman Post Number: 565 Registered: 11-2017 |
I would use the Bentley Heritage Parts website to research numbers. There was also a Bulletin regarding springs. There are different part numbers for L vs R. In my situation, I was reproducing the spring part number tags during restoration. The spring rates were calculated by the factory for comfort, IE ride quality. | ||
| Geoff Wootton Grand Master Username: dounraey Post Number: 2166 Registered: 05-2012 |
Hi Ross It's the boulevard ride - love it. Very soft but not too bouncy. | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1288 Registered: 11-2015 |
Geoff, Here's a spring rate calculator I wrote up from the information at bluecoilsprings. I processed the information and got the following numbers. And got the following numbers for compressed height. 13.4 for the oem spring 14.7 for the replacement spring Now we just need someone with good springs to measure the height with the wheels down. I'm going to guess the loaded height with wheels down should be 14ish I'll start looking for a match. -------------------------------- Here's the numbers I used org new length 18.125 21.625 od 6.1 6.1 bar dia 0.71 0.69 active coils 9.5 11.5 comp height 13.4 14.7 | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1289 Registered: 11-2015 |
Geoff, It looks like the OEM springs had a 324 spring rate and the replacements have 172 so they should be plusher than the OEMs which sounds good to me. | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1290 Registered: 11-2015 |
OK, I did the numbers again and looks like A compressed heights of 14.4 at rate of 324 for the OEM. A compressed height of 14.7 at a rate of 172 for the replacements. so 14.5 is probably the compressed height we are looking for with a spring rate anywhere from 172 to 324 | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1291 Registered: 11-2015 |
Larry, I am RHD and I have the gas tank on the drivers side so I am sure I have those springs. Robert, Any idea where I find that bulletin? I would like to read it. Glen, To be clear, you are running a SS1 and we are talking about rear springs correct. Thanks, | ||
| Geoff Wootton Grand Master Username: dounraey Post Number: 2167 Registered: 05-2012 |
Ross Yes, an SS1 and rear springs. | ||
| Robert J. Sprauer Frequent User Username: wraithman Post Number: 566 Registered: 11-2017 |
Ross The Bentley Heritage site will show you what parts are in your car by chassis number In the technical section there are workshop manuals and technical bulletins that were sent to dealers. | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1293 Registered: 11-2015 |
Robert, I'll check it out. |
