I've just fitted a Blydenstein B+ head and Kent fast road cam (NVO61) to my Nova GSi. She is running nice and smoothly apart from a small bit of pinking. I have checked the timing and its bang on, what could be causing this? and more importantly what can I do to solve it? Would a higher octane fuel help?
Higher octane fuel would definitly help. But if I we you get a vernier pully to set the cam timing and you will probably need to retard the ignition timing a touch as the compression has been raised. Get it down the rollers lad and let em do thier work! Now you have raied the compression and changed the cam there is no point in setting everything to factory setting (dead on timing marks etc) as it will have all changed.
Blydentiens heads are excellent I have one on my cav and its great.
if i were you i wouldn bother trying to set the cam timing yourself just get it set on the rollers....... yeah bed the valves in for 500miles no probs I rekon you shoul retard the cam timing 2 degrees but that just a guess from past experience.......
let the rolling road operator do his job, thats what your paying for mate.......if bill suggested him, he must be good.....
Bill doesn't raise the compression ratio (apart from the effect of the skim). He's not into skimming the head by silly amounts.
What fuel do you use? Tried super 97RON yet?
It's the ignition timing not the cam timing that will have most effect. And you don't want to retard the timing too much because it leads to a loss of power. (asumming that it's not advanced at the moment).
I say: try super unleaded
if that fails retard timing a bit
then get it on rollers and check it all out.
ps: noticed the difference yet? B+ head seems to give about 15-20BHP more on 1.6s.
Bill does raise the compression on the b+ head ! and I know that the cam timing will not have much affect on pinking I was merely saying that there is no point in having an uprated cam and vernier pulley and not setting it up as origional timing marks etc are no longer correct. also retarding the timing may lose a slight amount of top end power but can increase torque and greatly improve driveability.