Circumference of crank pulley?

[Chimjunkie]

Anyone know the diameter or circumference of the main pulley? Cant see the markings anymore and need to work out where 28deg is!

Cheers, Jon.

[Pupp]

If search is working, I did post up some figs about easter time (was an Emerald related thread and about setting the static timing)... if you don't find it I'll have a rummage and see if I kept any notes

[Chimjunkie]

Pupp said:

If search is working, I did post up some figs about easter time (was an Emerald related thread and about setting the static timing)... if you don't find it I'll have a rummage and see if I kept any notes

Thanks pupp, will find the thread through your profile. Tried searching but didnt have any success with the key words i tried!

[Chimjunkie]

Nope. No luck. Have tried every keyword.

[Pupp]

Chimjunkie said:

Pupp said:

If search is working, I did post up some figs about easter time (was an Emerald related thread and about setting the static timing)... if you don't find it I'll have a rummage and see if I kept any notes

Thanks pupp, will find the thread through your profile. Tried searching but didnt have any success with the key words i tried!

Just looked in my notes and found I had scribbled it down... I measured the circumference on the damper itself as 485 mm (did this several times by rolling along a flat surface and was satisfied it was consistent). Should get you going

[Chimjunkie]

Pupp said:

Just looked in my notes and found I had scribbled it down... I measured the circumference on the damper itself as 485 mm (did this several times by rolling along a flat surface and was satisfied it was consistent). Should get you going

Thanks very much Pupp. The damper is the metal part which the timing markings are on?

So, 0.74 deg per mm circumference gives 38mm from TDC for 28deg!

Edited by Chimjunkie on Wednesday 12th November 19:04

[Pupp]

Chimjunkie said:

Pupp said:

Just looked in my notes and found I had scribbled it down... I measured the circumference on the damper itself as 485 mm (did this several times by rolling along a flat surface and was satisfied it was consistent). Should get you going

Thanks very much Pupp. The damper is the metal part which the timing markings are on?

So, 0.74 deg per mm circumference gives 38mm from TDC for 28deg!

Edited by Chimjunkie on Wednesday 12th November 19:04

Yep, the thick part of the gubbins with the most mass and probably with some drillings/plugs in for balance etc... mine is a Serp of course (I imagine the pre-serp might well be a different size). You could always slip something like a cut-to-length plastic box strap around it in situ just as a check...

ETA - it's 37.722221

Edited by Pupp on Wednesday 12th November 19:37