Cloyes 9 keyway timing sets.

[TVR Beaver]

Got one of these to time my cam in as the adjustable one was loose on the keys and moved every time I nipped the locking bolts.

I was trying for 111.25 and on 2A got it to 110.8 so that’s great and will allow for bedding in.

So the questions more curiosity than anything as in the literature it says moving the crank sprocket one keyway (2 deg) will move the cam 1 deg. On initial setting at zero I got a reading of 112.9 so wanting to advance it 2 deg on the cam I moved it to 4A (they go 0, 2A, 4A, 6A, 8A and the same on R)..
But this gave a cam reading of 108.7? so it had advanced the cam 4 deg and not 2? And having checked 6A this also moved the cam 2 deg?....

So am I doing something wrong here?.. John Eales says he can get to within ½ deg with these and the claim on the box is it will move the cam 1 deg and not 2??...

It’s obviously a 2:1 but advancing 2 deg on the bottom should give 1 get on top.. it’s not accumulative as its fixed?... all very strange?

[spend]

Put an index mark on the cam sprocket and pointer to check the crank vs cam key offsets? It may be the method you are using to deduce the cam timing ~ ie cam opening to determine angle (lube / stiction / dti angularity / contact to follower... can all have minor effects that vary each time you spin the cam by hand)

[phazed]

I think you'll find the sprocket is reversible so you have more options, i.e. 6.

[TVR Beaver]

No, I tried it in a few keyways and it does change it 2 deg for sure... I'm measuring CL on the lobe and getting repeatabuility of about 0.2 deg time after time so it's very accurate.. mind you it should be with a 18" disc,

and you can't turn it over as it's dished on one side where it goes up against the crank shoulder...

[phazed]

I thought that mine was, I stand corrected!

[spend]

TVR Beaver said:

No, I tried it in a few keyways and it does change it 2 deg for sure... I'm measuring CL on the lobe and getting repeatabuility of about 0.2 deg time after time so it's very accurate.. mind you it should be with a 18" disc,

and you can't turn it over as it's dished on one side where it goes up against the crank shoulder...

Thats probably why JE makes his crank dampers an interference fit (with hammer) and does the crank pulley nut so flippin tight

[TVR Beaver]

Could be still does not explain the 2 deg move on the cam... has anyone else used these and got 1 deg??..
I obviously have the degree wheel on the crank..