Caber
After work last night I was flushing the cooling system which requires the engine to run at a fast idle for around 10 minutes, The car was outside
(just to keep the neighbours happy!!!) and I noticed that the stainless headers were glowing red!! excuse my ignorance but is this normal? or is it
weak mixture/advanced timing?
X-Flow BTW.
This happens with my V6 at tickover too! I suspect my mapping is waaaay out though so it might be an idea to have a closer look and book a rolling road session.
It can mean that your ignition timing is too retarded - combustion is taking place as the exhaust valves are opening causing excess heat to get into
the manifold
cheers
Mark
Cheers guys, any idea what the starting point is for ignition timing, currently I have it set at 12 deg before TDC at 1000RPM, I have noticed no
pinking and am of the opinion that the ideal setting is pinking less a touch? Maybe it needs advancing?
Head is gas flowed,275 cam, everything lightened and balanced, electronic dizzy with modified springs still with vac advance
Any ideas?
quote:
Originally posted by Ham
the opinion that the ideal setting is pinking less a touch?
so do I and also the designers of all modern engine management systems, they close the ignition timing control loop with a knock sensor.
Decent rolling road operators use a bosch knock sensor removed from a production engine that used a system such as motronic, then connect it to a
small audio amplifier and a set of headphones, then they can hear pinking on noisy cars under load on the rolling road.
That sounds a cool idea and presumably can be set up to work on the road as well! any suggestions on how to source a knock sensor and what sort of amp
to use?
Caber
quote:
Originally posted by NS Dev
so do I and also the designers of all modern engine management systems, they close the ignition timing control loop with a knock sensor.
Decent rolling road operators use a bosch knock sensor removed from a production engine that used a system such as motronic, then connect it to a small audio amplifier and a set of headphones, then they can hear pinking on noisy cars under load on the rolling road.