View Full Version : correct cam timing?
Does anyone no how cam sensitive the williams motor is?i recently put sum piper cams in with verniers in which i thought were timed up but got shit power figures??sum poeple reckon due to my low power its down to incorect cam timing?
cheers ricky
What have you advanced/retarded to? Really you need to have the cams set at "0-0", perform an intial run and then start moving the timing about and performing additional runs until you get the power band where you want it... that's the point of vernier pulleys.
How old is the engine, what is the compression like, what other mods are there?
its a rebuilt motor a few yrs ago but not many miles(it a track car brought from a ac williams)ive just bolted on a primaracing motor bike carb conversion if you look on "clio discussion"ive put up 2 threads on it and pics of the rr print out etc.
its a fair job tho with doing power runs and adj cam timing as you go along?
they will gain/loose a few bhp, by swinging either way but not in the order your wanting.
like ive said, try a longer intake length.
yeah in a clio more so though you can use an engine load bar to support the engine but its a twat with the top mount having to come off between runs..
ps i set the timing to the piper cam spec sheet,i set them at tdc lift
@ TDC in valve open 76"
ex valve open 58"
and i presume its running std c/r aswell :cry:
Stan did you see my print out on the discussion page it a small pic but you can make out the curve etc cheers
Here's a silly question but... what size are those bike carbs?
40mm
the intake length is way too short....
40mm
the intake length is way too short....
when u asked me to measure the lenght of the intake,do u mean from the throttle butterfly to the head or from the end of the trumpet to the head?
cheers
from the back of the valve to the end of trumpet.
just by looking at the pics, and the fact its ona std rad, its apparent the induction length is shorter than required.
Arr in that case just had another measure-from valve head to end of the trumpet you are looking at appx 250mm.
with the costom manifold it has a slight degree upwards,if the manifold was dead straight the carbs would then foul the rad.
had her all stripped down yesterday and triple checked the cam timing..it was spot on, even used the timing disc aswell
was getting full lift @ 110' etc etc-pipers specs anyway.
a nice cosworth may now be on the list instead!
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