Plunger Frame Springs

Hi Andrew,

Not very familiar with this type of suspension, but would assume the longer spring would go on the top, as that is where most load would be....but could be wrong!.......Someone more familiar with this type of suspension will, I am sure, confirm in more detail and give a definitive reply.

Regards John O

Previously George Phillips wrote:

My spare parts list for 1950 shows plunger suspension for modelsES2, 30, 30M, 40 and 40M. The upper spring (B4/674) appears to have around 12 convolutes and the lower spring (B4/677) around 10. Whilst my counting might be a bit out it appears to confirm that the longer spring is the upper one, which makes sense. George

Mymanualsconcur the numbers George stated.but, to be on thesafe side itsthespring stiffness that is important. I have played with the springing in the past to try and help the handling of plunger frames I'm sure others may have also.

A quick check is to make sure thematerial diameteris the same. If so,compresseach one agasinst ascale (bathroom will do) a fixed distanceandcompare theload? Again as stated abovetheheavy springing is on thetop to a carryall thesprung weight includingrider(s) and fuel. Thelower springsupporting the"un-sprung" load to a neutral position.

My hatstill off to Harold Daniel, the man whogot the most out of a plunger frame Manx.

Cheers

Jon