Cold Start Injector Flowrate?

Forum;

When I searched under CSI, I see numbers of 2.0-2.6cc (per minute?) as a delivery rate for the cylinder injectors, but I am interested in a comparative flowrate for the CSI.

I expect since the CSI enrichens for all cylinders, the pintle size and therefore flowrate are a lot higher. I realize CSI does not get pulsed, but (for Volvo 1800E) is energized during cranking only.

TIA for answers, und Weihnachtsgruesse aus Connecticut!

Hi Ron,

I am not sure whether I understand your question. Do you want to know flow rates for BMW 3.0 CSI injectors? Or do we talk of CIS ?

By CSI, I mean Cold Start Injector as fitted on Volvo...I thought this would be clear from Subject line.

Cheers

Hi Ron,

ah CSI, is it CSI Miami or New York ? Cold Start Iinjector is never pulsed like injectors. Depending on engine temperature it normally operates once while cranking cold engine (exception early P1800E). Normally CSI is operated by a thermo time switch. But on early Volvo we have a special ECU (009 and 017) that operates this CSI. This feature is called electronic thermo time switch. If you happen to replace such an ECU on an early Volvo P1800 E with a later ECU (034) your CSI will never be operated.

YLater P1800E have a conventional thermo time switch. The problem with electronic thermo time switch as part of ECU is that it will operate every time you start your car - if engine is cold enough. You can drown your engine in fuel if it does not start. A concentional thermo time switch is heated and will not operate in each starting process, only once.

Find more in Chapter 3.9 under Feature Coldst . T means that thermoe time switch is part of ECU.

All info you have given is good, correct, and I am also aware of it!...what I was asking was about FLOWRATE of CSI vs normal cylinder (pulsed) Injectors. In other words: With normal fuelrail pressure supply, what it the delivery rate for each? This is the info I am really interested in.

Thanks and Gruesse!

Hi,

that would be around 100 cm³/min . So it is much less than a fuel injector operated continuously. But injectors are operated in ms range only. Unfortunately Bosch cold start valve property list misses the 0 280 170 010.