Injection timing

[jmw]

It's time to start tinkering with the fuel injection timing on my S1100.
I am assuming that the removal of a shim will advance the injection timing and add a shim will retard it.
Is my assumption correct?
Does anybody know how many degrees one shim equates to?

       Mark

[mobile_bob]

i think 4 thousands equates to a degree, iirc
and yes if you remove you advance the timing, add and you retard the timing

bob g

[jmw]

Having spent a little while tinkering, I've discovered that there is nothing I can remove - it's just one (setting thickness) gasket.
Presumably the manufacturer has different thickness gaskets.

I wanted to advance the timing for 2 reasons:-

1) I'm using a lower cetane value fuel - veg oil, and

2) The exhaust seems a little on the hot side for my liking, which from my understanding means that it is still burning as it exits the exhaust port. Perhaps this is the manufacturers strategy for reducing noise, though I don't think it is an effective strategy if it is true.

Mark

[Ronmar]

You can make a rig to trigger a standard automotive inductive pickup timing light using the noise from the diesel injector.  I made mine with an off the shelf audio amp and mic from radioshack.  About $20 in parts and I already had the timing light...

[mobile_bob]

Ron:

i think you ought to write that timing light up and put it in the "white papers" section, that project was just too cool
and useful not to be available for use, that is if you want to open source it?  if not, i would pay for a set of plans for it!

bob g

[Ronmar]

Not much in the way of plans, it isn't rocket science, and it is all off the shelf parts from Radioshack.  I still have a drawing of it I uploaded to my photobucket.  A white paper might be a good idea though so it is here with the other information.  Here is the drawing, it is pretty self explanitory.

[mobile_bob]

Ron:

how does the timing light interface with the circuit? i assume the 3coil loop?
do you just clamp the inductive timing light to the loop?

if so that is just too cool

bob g

[vdubnut62]

Yes! Please take a few minutes to walk us through it! (I really just want to find a really, really cool use for the timing light my Dad left me.)
Ron.

[billswan]

Yes, Please ronmar write it up as bob asked I have though about that project many times and have always wondered if I actually wanted to build it if I could go back and find it In the old posts. For some of us searching isn't much fun!

Billswan

[veggie]

jmw,

0.20mm shim per 1 degree of crank angle.
You may find some useful information here...
http://www.microcogen.info/index.php?topic=493.0

veggie

[Ronmar]

Ron:

how does the timing light interface with the circuit? i assume the 3coil loop?
do you just clamp the inductive timing light to the loop?

if so that is just too cool

bob g

Yes, the timing light inductive pickup gets clamped around the 3 wire coil.  You will of course have to provide a 12VDC power source for the timing light.  The mic element gets taped to the cap on the top of the injector.  I have found that other mics will also work with it, such as old tape recorder mics, ect.  I speced the powered mic element as that was all radio shack had available when I wrote it up initially.  It is even easier to wire up with an unpowered mic element.

You turn on the amp and adjust the volume control till the light just fires reliably.  You will also have to add a timing mark and guide to the flywheel.  I built this because I was curious at the delay from the 19 degree spill timing point to the time the injector actually fires on a listeroid.  It wound up being about 18 degrees of delay with my injector actually firing at 1 degree BTDC...

I will do a proper writeup for the white paper section.