K-Series Timing/offset dowels

[SlowStig]

I am hoping that somebody can shed some light onto this, but I currently have a VVC K-Series which has had some head work and a Piper 270 exhaust cam fitted, however I have been told that the engine won't make full use of the exhaust cam due to the timing not being correct for it. Apparently I need a set of offset dowels making to fit to the main cambelt end of the engine, however I have no idea if this is correct and/or where to source them from?
From readings, the timing needs to be advanced on the exhaust cam(I am happy to be wrong) but if this is correct, does that mean that the other cambelt needs to be adjusted or the timing kept the same?

Sorry if it doesn't make sense, I am a little confused by it myself.

[SlowStig]

DVandrews said:

Latency in the belt drive system leads the cams to be around 6 degrees retarded(on average). The use of two 6 degree offset dowels,,one on the front VVC mech and the other at the front of the exhaust cam realigns the whole system and gets th cam timing very close to optimum, the rear VVC mech is connected to the exhaust cam at the rear so realigning that also realigns the rear mech.

In case of interest I keep a few in stock.

On regular K series engines a 15 degree dowel can be used , this can be rotated in the hole to give any offset between -15 to +15 degrees, I keep these in stock as an alternative to verniers, they are fiddler to fit but they save the cost of verniers.

Dave

The perfect answer my question, right from the horses mouth too! With your experience would you suggest getting a set of 6 degree dowels from yourself to get the most optimum from my uprated exhaust cam then? When timing the engine, would I do it from the TDC marking or from the other timing mark on the lower pulley?

I would fit a set of verniers but my concerns are that without a rolling road local, I could potentially cock up the timing and make the performance worse!

[SlowStig]

Hi Dave,

Just for ease, how can I get a set of the dowels from yourself? Do you have a contact number to order through etc?

Thanks