Injector Specifications.

John Dammeyer johnd at autoartisans.com
Mon Aug 16 19:42:22 GMT 1999


Hi,

Can anyone tell me how to find out the specifications on the Honda
1600cc Vtec Engines?

The older models had a resistor bank between 5 and 7 Ohms while the
newer ones don't use one.  The coil resistance is about 12 Ohms for
either model engine but that doesn't seem to be a really good indication
of what to use for a resistor because Honda may have used darlington
transistors with their extra 2V voltage drop.  They may now be using
intelligent switches that put a full 12V across the injectors and then
lower the current after n micro-seconds.

I've found that with a 6.8 ohm resistor that I've had fairly stable fuel
delivery whereas we discovered today that using the Honda resistor block
(6.2Ohms) that delivery is erratic,  especially if the engine gets warm.
I'm using sourcing FET devices (c/w short circuit protection and almost
no voltage drop) so I suspect I may have to use even a 7.5 Ohm resistor
but I don't like this guesswork.

Also,  I constrained in that I _must_ use the Honda Injectors rather
than a specific Bosch Model.  Suggestions?

Thanks,

John






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