camshaft gears/timing ?
 

Hi Guys, I keep hearing about an advantage to be had by optimising cam timing,I understand the principle but have no idea who can do this mod and where the required parts can be got,
Please enlighten me

Batesy :roll:

Brian you shouldn't need any parts unless somebody has replaced yout adjustable cam pulleys with fixed ones and they would only normally do that if they have been degreed in with fixed offset woodruff keys.

Hi Kevin,Thanks for replying,I think they are the standard ones but didnt realise they are vernier, Do you know the specs for setting them up ? I dont really have any issues with the way Doris runs but any extra is always welcome as the actress said to the bishop.

Best thing is to check what they are at the moment, if they are both identical the chances are they have already been done.
Different engine builders use different specs, some use standard others use something a bit different.
Two ways of doing it either on Cam lobe centres or at 1mm of lift on the inlet

Just a note. The pulleys aren't vernier adjustable, they're just slotted. This means that they can be slightly fiddly to set accurately, so be careful & patient.

Also, in my experience, most will be different between cylinders & are likely to be some way out, so, as Kev says, if there identical and on the money, then they've been dialled in.

I've always timed using inlet opening (although inlet closing is the most influential timing point), but would say most tuners go with centreline figures. My 'issue' with that is that the centreline does not always correspond with maximum valve lift.

Whatever, get them checked, because it smoothes the bike out and if you play around with the timing a little, you may make a few gains ;)

#33 Racing

been thinking about having a crack at this myself

apart from a couple of dial guages and a degree wheel thingy what other tools do you need?

is there someone known who makes the offset woodruff keys?

anyone got any good advice?

You only need one DTI as you can only work on one cylinder at a time.

Why would you want offset woodruff keys unless the standard adjustable Pulleys have been replaced by fixed ones from a different model

When Epicycle were trading they were previously selling stepped keys in 2010

Stepped keys @ $ 38.00 :In steps of 2 degree, 4 degree, 6 degree, 8 degree, 10 degree, 10 degrees quates to 1/2 a tooth out, so as they can be fitted either way this gave all the scope required to set the timing accurately

Think I'd be tempted to file my own at that price :eek: