|
Intake cam timing vs injector duty.
Hey guys,
I still have a few things to iron out on my setup,one of the things that is really bothering me is the smell of petrol in my oil.
One problem is, I get black smoke under WOT(more so on the dyno) but the AFR's look spot on,apparently this can happen due to combustion chamber shape? ...im not so sure..i thought it could be varying mixtures across the bank but all spark plugs look the same shade!!
One of the tuning difficulties we possibly all face is the intake cam 10 degree advance,what do all of you do here in this situation? the intake cam can take some time to advance based on oil pressure/temp/rpm etc etc so there is no defined line as to its on/off stat. We have set it up so that it comes on at >10%TP and >1500rpm ,it has been tricky to get the AFR's smooth around when it advances and when it retards at 5300.
All this has got me thinking about what angle the injector is initially fired and at what stat the cam is in when they do,i do tend to get some fuel buildup inside my plenum,which makes me think the timing is not ideal...and could this also be why we get some black smoke through most of the WOT rpm band?
Any advice or experience on the cam timing/injector timing from you guys would be great.
Thanks,
Paul
|