Duraspark Axial play...

[Bort62]

What's the spec? Mine is pretty sloppy....

 

[addo]

20 thou, from memory. Do you have any grease paint or similar to check the mesh point for shimming?

Endfloat may be taken up between the gear and housing, or at top of the shaft, depending on the need.

Can't find where I got that figure, but probably the Ford factory manual for Oz Falcons. Imagine it has no need to vary between Bosch and Duraspark distributors.

 

[Bort62]

Thanks Addo.

I think that, since i've run this thing a bit with no visible wear, I will shim it to keep the gear in the same place.

 

[FalconSedanDelivery]

But you must shim it at the bottom and top , or risk ramming the gear into the block

 

[Bort62]

Well it just so happens the damn thing was at 19thou already.

Anyone want to venture a further guess as to why my timing is jumping around at idle ?

 

[wsa111]

Anyone want to venture a further guess as to why my timing is jumping around at idle ?

What dizzy are you running???

Check your dizzy gear for wear???
Is your centrifigul advance coming in at idle speeds & that will vary the timing??

What kind of oil pressure do you have at idle & at 4500 rpms???

Do you have spark scatter at 4500 rpms??

Try another dizzy & see if the scatter stops.

The small block chevy had horrendous spark scatter at higher engine speeds, the anti-cavation oil pump by moroso eliminated 80% of that.
But thats a different ballgame.

What kind of timing chain are you running?? The roller chain from Mike at classic inclines is the only one i would ever run even in a stock engine.

Keep us informed what you do or what you find. Bill

 

[Bort62]

Well,

I am not sure what chain I am running, but it is a double roller. I bought the short block assembled from a guy.

The Dizzy is a DSII reman from kragen. No wear on the gear, looks fine.

Could be the centrifugal coming in, it's idling around 1k right now.

No oil pressure gauge, so I couldnt tell ya there - either.

I know, not much help.