BN1 Front Spring Dimensions

[zblu]

Have a pair of coilsprings been offered to me, 11.5" long, 4.75" O/D, 3/4" coil dia,7 full coils, do these suit? as I dont have my BN1 close by to check

 

[anthony7777]

zblu, i have a set of original springs that come off a bn-2, they should be the same as those for bn-1 they measure 11-3/4 long, 4-5/8 diameter, and 17/32, thick. have your friend remeasure his.

 

[zblu]

thanks anthony7777, I measured quickly with a tape 290mm, 120mm, 17mm, will recheck tomorrow, all but coil dia sound close enough

 

[anthony7777]

zblu, ya good idea, mine naturally have some rust but i cant see how 7/32 wasted away, perhaps while building these cars they pulled them out of bins from different vendors? maybe you got the "low rider" version.

 

[zblu]

Just checked my parts book anthony7777, BN1 and BN2 have different part numbers, or maybe i got the uprated stiffer comp ones on offer, nothing a spacer cant fix

 

[anthony7777]

zblu, its good to have a parts book! moss says bn-1 and bn-2 use the same spring, they do list a repro set for bn-1, bn-2 and bn-4 that must be changed in pairs, p/n 661-910 there using the same p/n for all of these, im sure the ones you have will be fine, i like the fact there a little "chunkyer".

 

[zblu]

BN1 is part No. 1B 4315, and BN2 part No. is 4484, wonder if the height diff is taken up on install then the action should be a stiffer ride with same height due to larger dia coils not settling as much on install? Have to wait until someone with BN1 coils chimes in!

 

[zblu]

Well, remeasured and got 11" 17/32 high, 4" 27/32 outside spring dia, and 5/8" coil dia, number of coils matches pic in parts book, Hmmm!, might grab them