Divman wrote: Hey Kawboy
In answer to your question re injectors - I;ve used 250cc injectors out of a Golf iv 1800 20 valve.
I run original coils with NGK BR8EG plugs and she runs fine at high RPM
I had to make up my own fuel rail for space under tank.
Bosch fuel pump with external pressure regulator set at 7 bar.
So much to comment on here
6 - 250cc injectors will support 250 BHP @ 44 psi so these injector are oversized and you're running them @ 101.5 psi which is 2-1/2 times normal operating pressure. I'm surprised that you can control the injectors at low rpm's since the delta time would be so small.
BPR8EG's(which NGK.com show no reference to yet I remember the "G" series plugs) are 2 heat ranges colder than the stock plugs and you can get away with these without fouling plugs? These bikes are known for oil fouling and BPR6 seems to be a compromise that we manage to live with.
10,800 rpm and still pulling power. Almost all engines pull their highest power (torque) at about 3/4 maximum RPM which for the KZ should be around 6,000-6,500 RPM and highest BHP near valve float which usually happens near redline and you're pulling to 10,800 RPM so you haven't achieved valve float at 10,800?
10,800 RPM translates out to an average piston speed of 5031 Ft/min. Most engines are designed to not exceed 4,000 Ft/min and race engines to about 4500 Ft/min and the reason is lack of control of piston ring flutter.
Cut and paste from
www.musclecardiy.com " The more power strokes per minute, the more power available to do work. Consider the 2000 Ferrari Formula 1 engine that has a stroke of 1.6-inch (40.64 mm). At 18,000 rpm that's a mean piston speed of 4,800 fpm and a peak speed over 7,536 fpm, or more than 85 mph at mid-stroke."
So you're pushing piston speeds higher than an F1 engine without catastrophic failure? With a redline of 8500 rpm and a stroke of 71mm on the stock engine, the average piston speed is 3960 Ft/min average and that's up there.
I would still like to hear which Spitronic ECU you chose (Mercury 2 or the Orion and which level Standard, Intermediate, Advanced or Ultimate) and if you are controlling the ignition coils it.